Hycroft Mining (ANV) 10-Q 3 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'ANV	'
Entity Registrant Name	'Allied Nevada Gold Corp.	'
Entity Central Index Key	'0001376610	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	104,438,336

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets:	'	'
Cash and cash equivalents	$5,799	$81,470
Accounts receivable	1,804	8,227
Inventories - Note 3	23,726	26,410
Ore on leachpads, current - Note 4	188,263	206,504
Prepaids and other - Note 5	6,652	10,857
Assets held for sale	45,564	47,357
Deferred tax assets, current	31,159	22,943
Current assets	302,967	403,768
Restricted cash - Note 6	48,140	41,215
Stockpiles and ore on leachpads, non-current - Note 4	121,724	116,192
Other assets, non-current - Note 5	11,913	12,682
Plant, equipment, and mine development, net - Note 7	864,745	890,271
Mineral properties, net - Note 8	45,030	48,473
Total assets	1,394,519	1,512,601
Liabilities:	'	'
Accounts payable	38,745	67,958
Interest payable	12,481	3,402
Other liabilities, current - Note 9	7,159	8,512
Debt, current - Note 10	71,157	76,226
Asset retirement obligation, current	20	20
Current liabilities	129,562	156,118
Other liabilities, non-current - Note 9	41,498	22,735
Debt, non-current - Note 10	472,165	522,427
Asset retirement obligation, non-current	16,161	15,344
Deferred tax liabilities, non-current	8,225	18,928
Total liabilities	667,611	735,552
Commitments and Contingencies - Note 20	'	'
Stockholders’ Equity:	'	'
Common stock, $0.001 par value - Shares authorized: 200,000,000 Shares issued and outstanding: 104,438,336 and 104,043,169, respectively	104	104
Additional paid-in-capital	754,991	750,119
Accumulated other comprehensive income - Note 18	4,367	1,674
(Accumulated deficit) retained earnings	-32,554	25,152
Total stockholders’ equity	726,908	777,049
Total liabilities and stockholders’ equity	$1,394,519	$1,512,601

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]	'	'
Common stock, par value, in dollars per share	$0.00	$0.00
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	104,438,336	104,043,169
Common stock, shares outstanding	104,438,336	104,043,169

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of (Loss) Income and Comprehensive (Loss) Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue - Note 11	$76,912	$76,741	$245,560	$184,929
Operating expenses:	'	'	'	'
Production costs	55,071	51,775	166,796	108,813
Depreciation and amortization	16,308	9,607	47,573	19,194
Write-down of production inventories - Note 4	70,690	0	70,690	0
Total cost of sales	142,069	61,382	285,059	128,007
Exploration, development, and land holding	619	940	2,013	3,106
Accretion	273	165	818	494
General and administrative	5,290	3,675	17,284	15,481
Loss (gain) on dispositions or sales of mineral properties, net - Note 8	2,679	1,441	-16,801	1,441
Loss on assets classified as held for sale and asset dispositions, net	897	298	6,876	298
Separation and severance costs - Note 12	0	3,011	0	5,933
(Loss) income from operations	-74,915	5,829	-49,689	30,169
Other income (expense):	'	'	'	'
Interest income	3	77	18	315
Interest expense - Note 10	-11,358	-5,361	-28,474	-13,683
Other, net - Note 13	18	343	-20	-558
(Loss) income before income taxes	-86,252	888	-78,165	16,243
Income tax benefit - Note 14	23,838	4,083	20,459	1,776
Net (loss) income	-62,414	4,971	-57,706	18,019
Other comprehensive income (loss), net of tax	'	'	'	'
Reclassifications into earnings, net of tax - Note 18	11,925	-5,913	13,037	7,951
Other comprehensive income, net of tax	2,081	2,498	2,693	3,492
Comprehensive (loss) income	-60,333	7,469	-55,013	21,511
(Loss) income per share:	'	'	'	'
Basic - Note 15, in dollars per share	($0.60)	$0.05	($0.55)	$0.19
Diluted - Note 15, in dollars per share	($0.60)	$0.05	($0.55)	$0.18
Change in fair value of effective portion of unsettled cash flow hedge instruments	'	'	'	'
Other comprehensive income (loss), net of tax	'	'	'	'
Cash flow hedge instruments, net of tax	2,157	2,470	3,002	3,596
Settlements of cash flow hedges	'	'	'	'
Other comprehensive income (loss), net of tax	'	'	'	'
Cash flow hedge instruments, net of tax	($12,001)	$5,941	($13,346)	($8,055)

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:	'	'	'	'
Net (loss) income	($62,414)	$4,971	($57,706)	$18,019
Adjustments to reconcile net (loss) income for the period to net cash provided by (used in) operating activities:	'	'	'	'
Depreciation and amortization	16,308	9,607	47,573	19,194
Accretion	273	165	818	494
Loss (gain) on dispositions or sales of mineral properties, net - Note 8	2,679	1,441	-16,801	1,441
Loss on assets classified as held for sale and asset dispositions, net	897	298	6,876	298
Stock-based compensation - Note 16	1,628	1,217	4,872	5,305
Deferred taxes	-23,747	-3,097	-20,368	-2,145
Write-down of production inventories - Note 4	16,005	0	16,005	0
Other non-cash items	0	-291	0	677
Changes in operating assets and liabilities:	'	'	'	'
Accounts receivable	1,275	348	6,423	49,541
Materials and supplies inventories	-1,206	-1,052	1,653	-6,498
Production-related inventories	36,335	-23,640	11,255	-100,565
Prepaids and other	452	-2,968	5,772	-5,870
Assets held for sale	115	0	4,522	0
Accounts payable	10,109	11,313	4,663	-805
Interest payable	8,644	8,452	9,079	8,452
Other liabilities	-2,133	-260	-2,495	-1,226
Asset retirement obligation	0	-3	0	-31
Net cash provided by (used in) operating activities	5,220	6,501	22,141	-13,719
Cash flows from investing activities:	'	'	'	'
Additions to plant, equipment, and mine development	-6,304	-88,208	-73,918	-285,286
Proceeds from mineral property sale - Note 8	0	0	20,000	0
Decreases (increases) in restricted cash - Note 6	1,793	0	-6,925	-9,375
Additions to mineral properties	0	0	0	-51
Proceeds from other investing activities	45	100	50	115
Net cash used in investing activities	-4,466	-88,108	-60,793	-294,597
Cash flows from financing activities:	'	'	'	'
Repayments of principal on capital lease and term loan obligations	-13,540	-10,412	-41,132	-25,540
Proceeds from revolving credit agreement borrowings	5,000	0	5,000	0
Payments of debt issuance costs	-27	-251	-887	-1,263
Proceeds from issuance of common stock	0	0	0	151,071
Payments of share issuance costs	0	-219	0	-8,543
Net cash (used in) provided by financing activities	-8,567	-10,882	-37,019	115,725
Net decrease in cash and cash equivalents	-7,813	-92,489	-75,671	-192,591
Cash and cash equivalents, beginning of period	13,612	246,945	81,470	347,047
Cash and cash equivalents, end of period	5,799	154,456	5,799	154,456
Supplemental cash flow disclosures:	'	'	'	'
Cash paid for interest	2,205	2,746	23,897	23,315
Significant non-cash financing and investing activities:	'	'	'	'
Mining equipment acquired through debt financing	0	26,867	0	131,490
Accounts payable reduction through capital lease	$0	$0	$0	$2,560

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Stockholders' Equity (USD $)

Total

Common Stock

Additional Paid-in Capital

Accumulated Other Comprehensive Income

Retained Earnings (Accumulated Deficit)

Restricted Share Unit Plan

Restricted Share Unit Plan

Restricted Share Unit Plan

Deferred Share Unit Plan

Deferred Share Unit Plan

Performance and Incentive Pay Plan

Performance and Incentive Pay Plan

In Thousands, except Share data, unless otherwise specified

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Common Stock

Additional Paid-in Capital

USD ($)

Additional Paid-in Capital

USD ($)

Additional Paid-in Capital

USD ($)

USD ($)

USD ($)

Beginning Balance at Dec. 31, 2013

$777,049

$104

$750,119

$1,674

$25,152

'

'

'

'

'

'

'

Beginning Balance (in shares) at Dec. 31, 2013

'

104,043,169

'

'

'

'

'

'

'

'

'

'

Increase (Decrease) in Stockholders' Equity [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

Stock-based compensation (in shares)

'

'

'

'

'

'

382,667

'

'

'

12,500

'

Stock-based compensation

'

'

'

'

'

4,006

'

4,006

662

662

204

204

Other comprehensive income - Note 18

2,693

'

'

2,693

'

'

'

'

'

'

'

'

Net loss

-57,706

'

'

'

-57,706

'

'

'

'

'

'

'

Ending Balance at Sep. 30, 2014

$726,908

$104

$754,991

$4,367

($32,554)

'

'

'

'

'

'

'

Ending Balance (in shares) at Sep. 30, 2014

'

104,438,336

'

'

'

'

'

'

'

'

'

'

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Basis of Presentation	'
	1. Basis of Presentation
	The accompanying unaudited Condensed Consolidated Financial Statements of Allied Nevada Gold Corp. and its consolidated subsidiaries (the “Company”) have been prepared in accordance with United States generally accepted accounting principles (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations of the SEC. Therefore, the information included in this Quarterly Report on Form 10-Q should be read in conjunction with the audited Consolidated Financial Statements and related footnotes of the Company’s Annual Report on Form 10-K for the year ended December 31, 2013. In the opinion of management, all adjustments and disclosures necessary to fairly present the interim financial information set forth herein have been included. These interim financial statements, with the exception of any recently adopted accounting pronouncements described in Note 2 - Accounting Pronouncements, follow the same Significant Accounting Policies disclosed in the Company’s most recent Annual Report on Form 10-K.
	The results reported in these Condensed Consolidated Financial Statements are not necessarily indicative of the results that may be expected for the entire year or for future years.
	References to “$” refers to United States currency and “CDN $” refers to Canadian currency.
	Reclassifications
	Certain reclassifications have been made to the prior period Condensed Consolidated Financial Statements to conform to the current period presentation. During the three and nine months ended September 30, 2013, the Company reclassified a $1.4 million loss on disposal of mineral properties from Other, net to Loss (gain) on dispositions or sales of mineral properties, net and a $0.3 million loss on equipment held for sale from Other, net to Loss on assets classified as held for sale and asset dispositions, net. These reclassifications had no effect on previously reported assets, liabilities, cash flows, or net income.

Accounting_Pronouncements

Accounting Pronouncements	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Accounting Pronouncements	'
	2. Accounting Pronouncements
	Recently Issued
	In April 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-08, “Reporting Discontinued Operations and Disclosures of Disposals of a Component of an Entity.” ASU 2014-08 changes the criteria for reporting discontinued operations and requires new disclosures for discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. ASU 2014-08 is effective for fiscal years, and interim periods within those years, beginning on or after December 15, 2014, which for the Company means the first quarter of the year ending December 31, 2015. Other than the additional presentation and disclosure requirements, the adoption of this guidance is not expected to have a material effect on the Company’s consolidated financial position, results of operations, or cash flows.
	In May 2014, the FASB and the International Accounting Standards Board issued new joint and converged guidance surrounding revenue recognition. ASU 2014-09, “Revenue from Contracts with Customers” will supersede nearly all existing revenue recognition guidance, including industry-specific guidance, and requires that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 does not permit early adoption and is effective for fiscal years, and interim periods within those years, beginning on or after December 15, 2016, which for the Company means the first quarter of the year ending December 31, 2017. ASU 2014-09 allows for either a “full retrospective” adoption, meaning the new standard is applied to all periods presented, or a “modified retrospective” adoption, meaning the new standard is applied only to the most current period presented and any cumulative effect of adoption is recognized as an adjustment to the opening balance of retained earnings. The Company has evaluated its current revenue recognition policies and past and present sales contracts and does not currently believe it will be materially impacted by the requirements of ASU 2014-09. Historically, the Company’s sole revenue related performance obligation has been the delivery of metal to customers, either physically or by account transfer, and has been satisfied at the same point in time the Company’s customers obtain control of the delivered metal. As such, the Company currently anticipates adopting ASU 2014-09 using the “modified retrospective” approach and other than the additional presentation and disclosure requirements, does not expect such adoption will have a material effect on the Company’s consolidated financial position, results of operations, or cash flows.
	In August 2014, the FASB issued ASU No. 2014-15, “Presentation of Financial Statements - Going Concern.” ASU 2014-15 requires management to assess, at each interim and annual reporting period, whether substantial doubt exists about an entity’s ability to continue as a going concern within one year after the date that the financial statements are issued and, when necessary, provide related footnote disclosures. Management’s assessment should be based on relevant conditions and events that are known and reasonably knowable at the date that the financial statements are issued. ASU 2014-15 is effective for fiscal years ending after December 15, 2016, which for the Company means the year ending December 31, 2016; however, early adoption is permitted. Other than the additional presentation and disclosure requirements, the adoption of this guidance is not expected to have a material effect on the Company’s consolidated financial position, results of operations, or cash flows.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2014
Inventory Disclosure [Abstract]	'
Inventories	'
	3. Inventories
	The following table provides the components of inventories and the estimated recoverable gold ounces therein (in thousands, except ounces):
		30-Sep-14			31-Dec-13
		Amount		Gold ounces	Amount		Gold ounces
	Materials and supplies	$	16,349		$	18,002
	Merrill-Crowe in-process	4,794		3,490	6,322		5,662
	Carbon column in-process	867		655	859		724
	Doré finished goods	1,716		1,258	1,227		1,106
		$	23,726	5,403	$	26,410	7,492
	As of September 30, 2014 and December 31, 2013, production-related Inventories included $1.7 million and $1.6 million, respectively, of capitalized non-cash depreciation and amortization costs.

Stockpiles_and_Ore_On_Leach_Pa

Stockpiles and Ore On Leach Pads	9 Months Ended
	Sep. 30, 2014
Stockpiles and Ore On Leach Pads [Abstract]	'
Stockpiles and Ore On Leach Pads	'
	4. Stockpiles and Ore On Leach Pads
	The following table summarizes stockpiles and ore on leach pads and the estimated recoverable gold ounces therein (in thousands, except ounces):
		30-Sep-14			31-Dec-13
		Amount		Gold ounces	Amount		Gold ounces
	Current:
	Ore on leach pads	$	188,263	163,962	$	206,504	180,919
	Non-current:
	Ore on leach pads	$	80,684	70,269	$	88,501	77,537
	Stockpiles	41,040		79,014	27,691		61,771
		$	121,724	149,283	$	116,192	139,308
	As of September 30, 2014 and December 31, 2013, Ore on leach pads, current and non-current included $60.9 million and $65.6 million, respectively, of capitalized non-cash depreciation and amortization costs. As of September 30, 2014 and December 31, 2013, Stockpiles included $7.3 million and $4.8 million, respectively, of capitalized non-cash depreciation and amortization costs.
	The period-end market value of the Company’s production-related inventories is determined in part by using period-end London Bullion Market Association (“LBMA”) prices per gold and silver ounce and is highly sensitive to these inputs. At September 30, 2014, the period-end LBMA price per gold ounce was $1,216.50 and the price per silver ounce was $17.11. Due to metal price levels at September 30, 2014 and an increase in per gold ounce production costs during the three months ended September 30, 2014, the Company’s application of its lower of cost or market accounting policy resulted in a $70.7 million write-down of Ore on leach pads. The Company’s $70.7 million write-down of Ore on leach pads consisted of $16.0 million of allocated depreciation and amortization costs and $54.7 million of previously incurred cash production costs.
	Further declines from September 30, 2014 metal price levels and/or future production costs per gold ounce greater than the September 30, 2014 carrying value per gold ounce included in Ore on leach pads could result in, or contribute to, additional future write-downs of production-related inventories. The write-down during the three months ended September 30, 2014 resulted solely from the Company’s application of its lower of cost or market accounting policy and was unrelated to any metallurgical balancing analytics or changes to recovery rates.

Prepaids_and_Other_Assets

Prepaids and Other Assets	9 Months Ended
	Sep. 30, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]	'
Prepaids and Other Assets	'
	5. Prepaids and Other Assets
	The following table provides the components of prepaids and other assets (in thousands):
		30-Sep-14		31-Dec-13
	Prepaids and other
	Prepaids	$	4,734	$	6,083
	Deposits	1,224		1,685
	Federal income taxes receivable	605		2,914
	Other	89		175
		$	6,652	$	10,857
	Other assets, non-current
	Debt issuance costs, net	$	11,048	$	12,208
	Reclamation policy premium, net	385		474
	Cash collateral for cross currency swap - Note 10	480		—
		$	11,913	$	12,682

Restricted_Cash

Restricted Cash	9 Months Ended
	Sep. 30, 2014
Cash and Cash Equivalents [Abstract]	'
Restricted Cash	'
	6. Restricted Cash
	The following table provides the components of restricted cash (in thousands):
	Obligation collateralized	30-Sep-14		31-Dec-13
	Asset retirement obligation surety bonds	$	38,140	$	41,215
	Revolving credit agreement - Note 10	10,000		—
		$	48,140	$	41,215

Plant_Equipment_and_Mine_Devel

Plant, Equipment, and Mine Development, Net	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Plant, Equipment, and Mine Development, Net	'
	7. Plant, Equipment, and Mine Development, Net
	The following table provides the components of plant, equipment, and mine development, net (in thousands):
		Depreciable life or method	30-Sep-14			31-Dec-13
	Mine equipment	5 - 7 years	$	298,026		$	312,425
	Process equipment	Units-of-production	274,757			60,875
	Mine development	Units-of-production	126,197			120,038
	Leach pads	Units-of-production	81,446			78,737
	Buildings and leasehold improvements	10 years	25,640			25,083
	Furniture, fixtures, and office equipment	2 - 3 years	4,417			4,236
	Vehicles	3 - 5 years	2,943			2,943
	Construction in progress and other		240,342			421,117
			1,053,768			1,025,454
	Less: accumulated depreciation and amortization		(189,023		)	(135,183		)
			$	864,745		$	890,271
	During the second quarter of 2014, the Company placed the crushing system (process equipment) into service.

Mineral_Properties_Net

Mineral Properties, Net	9 Months Ended
	Sep. 30, 2014
Mineral Properties, Net [Abstract]	'
Mineral Properties, Net	'
	8. Mineral Properties, Net
	The table below is a summary of the Company’s gains and losses on dispositions and sales of mineral properties (in thousands):
		Three months ended September 30,						Nine months ended September 30,
		2014			2013			2014			2013
	Loss on dispositions of early-stage exploration properties	$	(2,679	)	$	(1,441	)	$	(2,679	)	$	(1,441	)
	Gain on sale of a 75% controlling interest in the Hasbrouck, Three Hills, and Esmeralda County properties	—			—			19,480			—
		$	(2,679	)	$	(1,441	)	$	16,801		$	(1,441	)
	From time to time, the Company performs reviews of its early-stage exploration properties, which are properties having no defined mineralized material. If the Company determines that abandonment of any properties is appropriate, the book value is written-off and a loss is recognized.
	On April 22, 2014, the Company entered into a Purchase and Sale Agreement and sold a 75% controlling interest in the Hasbrouck, Three Hills, and Esmeralda County exploration properties (the “Properties”) to West Kirkland Mining, Inc. (“WKM”) for $20.0 million. The carrying value of the Properties sold to WKM was $0.5 million, resulting in the recognition of a $19.5 million gain during the nine months ended September 30, 2014.

Other_Liabilities

Other Liabilities	9 Months Ended
	Sep. 30, 2014
Other Liabilities Disclosure [Abstract]	'
Other Liabilities	'
	9. Other Liabilities
	The following table summarizes the components of other liabilities, current and non-current (in thousands):
		30-Sep-14		31-Dec-13
	Other liabilities, current
	Accrued compensation	$	5,333	$	3,587
	Derivative instruments - Note 18	1,685		669
	Capital expenditure retentions	—		4,256
	Other	141		—
		$	7,159	$	8,512
	Other liabilities, non-current
	Derivative instruments - Note 18	$	35,296	$	21,730
	Accounts payable	5,188		—
	Deferred royalty income	958		953
	Other	56		52
		$	41,498	$	22,735

Debt

Debt	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Debt	'
	10. Debt
	The following table summarizes the components of debt (in thousands):
		30-Sep-14				31-Dec-13
	Debt, current:
	Capital lease and term loan obligations	$	53,366		(1)	$	58,435		(1)
	Term and Security Deposit loan	17,791			(2)	17,791			(2)
		$	71,157			$	76,226
	Debt, non-current:
	Capital lease and term loan obligations	$	110,284			$	146,347
	Revolving Credit Agreement	5,000				—
	8.75% Senior Notes due June 2019 (3)	356,881				376,080
		$	472,165			$	522,427
	(1)  Includes borrowings of $8.9 million and $5.7 million as of September 30, 2014 and December 31, 2013, respectively, for mine equipment included in Assets held for sale.
	(2)  Entire borrowing is attributable to the third rope shovel which is included in Assets held for sale.
	(3)   Effective interest rate of 8.375% after cross currency swap. See Note 18 - Derivative Instruments for additional detail.
	Senior Notes
	In May 2012, the Company issued CDN $400.0 million of uncollateralized senior notes (the “Notes”). The Notes are denominated in Canadian dollars, pay interest semi-annually at the rate of 8.75% per annum, and mature in June 2019. Concurrent with the issuance of the Notes, the Company entered into a cross currency swap agreement based upon a notional amount of $400.4 million, which equaled the gross proceeds to the Company from the issuance, which fixed the interest rate at 8.375% as further described in Note 18 - Derivative Instruments. The Notes balance was $356.9 million based upon the U.S. dollar to Canadian dollar exchange rate on September 30, 2014. The Notes are guaranteed by most of the Company’s currently wholly-owned subsidiaries, including Hycroft Resources & Development Inc., which owns the Hycroft Mine and conducts mining operations.
	Capital Lease and Term Loan Obligations
	The Company’s capital lease and term loan obligations are for the purchase of mining equipment, bear interest at rates between 4% - 7% per annum, and primarily carry 60 - 84-month terms. The following is a summary of the future minimum payments under the Company’s capital lease and term loan obligations as of September 30, 2014 (in thousands):
	Fiscal Year	Minimum Lease
		Payments
	2014	$	22,499		(1)
	2015	49,898
	2016	47,392
	2017	32,941
	2018	11,885
	Thereafter	15,421
	Less: interest	(16,386		)
	Net minimum capital lease payments	163,650
	Less: current portion	(53,366		)
	Non-current portion	$	110,284
	(1)  Includes principal of $8.9 million for mine equipment included in Assets held for sale.
	Term and Security Deposit Loan Agreement
	In March 2013, the Company entered into a Term and Security Deposit Loan Agreement (the “Loan Agreement”) related to the purchase of three electric rope shovels. Under the Loan Agreement, the Company was made available up to $60.0 million ($20.0 million for each shovel) for scheduled advance security deposit payments pursuant to purchase agreements for the electric rope shovels and up to $90.0 million ($30.0 million for each shovel) in term loan financing to fund the purchase of the electric rope shovels once commissioned at the Hycroft Mine. Under the Loan Agreement, as electric rope shovels were commissioned, amounts previously advanced to the Company for security deposits, together with the remaining purchase price of each electric rope shovel, were converted to term loan obligations. The electric rope shovels secure all amounts borrowed by the Company under the Loan Agreement.
	During 2013, the Company commissioned two (of the three) electric rope shovels and, as such, amounts borrowed for these two shovels are included in capital lease and term loan obligations. Costs for the third electric rope shovel are included in Assets held for sale at September 30, 2014 and, as such, related amounts borrowed under the Loan Agreement are included in Debt, current as repayment will occur when the components of the third shovel are sold, which the Company believes will happen within the next twelve months. Advances for security deposits under the Loan Agreement bear an interest rate determined by an applicable rate plus the three month LIBOR, which approximated 4.7% at September 30, 2014. The two executed term loan obligations for the commissioned shovels carry seven year terms and bear interest at a fixed rate of approximately 6%.
	Revolving Credit Agreement
	In May 2014, the Company entered into a Third Amended and Restated Credit Agreement (the “Revolver”) which amended and restated the December 2013 Second Amended and Restated Credit Agreement (the “Previous Revolver”). The aggregate amount available to the Company under the Revolver is determined by a Borrowing Base (as defined in the Revolver) that makes up to $75.0 million available (an increase from the $40.0 million available under the Previous Revolver) to the Company depending upon 80% of the net realizable value of the gold and silver in the Company’s ore on leach pads, in-process, and finished goods inventories less estimated remaining processing and selling costs. As of September 30, 2014, the full $75.0 million was available under the Revolver, which was reduced by $11.4 million for financial letters of credit issued to collateralize the cross currency swap (discussed in the following paragraph) and $5.0 million in outstanding cash borrowings, resulting in remaining availability of $58.6 million.
	Borrowings under the Revolver bear interest per annum at either LIBOR plus 4.5% or at an Alternate Base Rate, as defined in the Revolver, plus 3.5%. Financial letters of credit and non-financial letters of credit bear interest per annum at 4.50% and 2.70%, respectively. The Revolver is collateralized by substantially all of the Company’s assets and matures on April 30, 2016.
	In December 2013, when the Company entered into the Previous Revolver, which amended and restated the October 2012 Amended and Restated Credit Agreement (the “2012 Revolver”), two lenders under the 2012 Revolver exited the credit facility. These two lenders are holders of a portion of the Notes cross currency swap which, in December 2013, ceased being collateralized by the security they held as lenders to the 2012 Revolver. As a result, the Company is required to fully collateralize any mark-to-market liability position for 22% of the cross currency swap, which is the portion held by these two lenders, with cash, letters of credit, or a combination of the two. As of September 30, 2014, the Company had remitted $0.5 million of cash and issued $11.4 million of financial letters of credit to collateralize the mark-to-market liability position of 22% of the cross currency swap.
	Debt Covenants
	The Company’s debt agreements contain representations and warranties, events of default, and covenants that are customary for agreements of these types. The Company’s Notes contain provisions that, among other things, restrict or limit the ability of the Company to redeem the Notes, incur or guarantee additional debt, pay dividends, and consolidate, merge or sell all or substantially all of the Company’s assets. The Company’s Revolver and certain capital lease obligations contain financial covenants related to Tangible Net Worth, Minimum Current Ratio, Minimum Reserve Tail, and Cash and Cash Equivalents balances, as such terms are defined in the Revolver. The Company is required to maintain a Tangible Net Worth of $437.0 million plus 25% of positive net income for each quarter ending after September 30, 2013, a Minimum Current Ratio of 1.25:1.0, and Cash and Cash Equivalents of $10.0 million in deposit accounts with the Revolver lenders which are restricted from use by the Company for the full term of the Revolver. The Minimum Reserve Tail covenant requires that at all times the Company will maintain more than 600,000 gold equivalent recoverable ounces in its heap leach reserves after maturity of the Revolver. The Company was in compliance with all debt covenants as of September 30, 2014.
	Interest Expense
	The following table summarizes the components of interest expense (in thousands):
		Three months ended September 30,								Nine months ended September 30,
		2014				2013				2014			2013
	8.75% Senior Notes due June 2019 (1)	$	8,452			$	8,452			$	25,081		$	25,219
	Capital lease and term loan obligations	2,124				1,989				5,943			5,441
	Amortization of debt issuance costs	740				664				2,047			1,909
	Revolver interest and standby fees	341				385				858			1,010
	Term and Security Deposit loan	226				755				671			1,105
	Other interest expense	141				368				424			592
	Capitalized interest	(666		)		(7,252		)		(6,550		)	(21,593		)
		$	11,358			$	5,361			$	28,474		$	13,683
	(1) Effective interest rate of 8.375% after cross currency swap. See Note 18 - Derivative Instruments for additional detail.

Revenue

Revenue	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Revenue	'
	11. Revenue
	The table below is a summary of the Company’s gold and silver revenue (in thousands, except ounces sold):
		Three months ended September 30,						Nine months ended September 30,
		2014			2013			2014			2013
		Amount		Ounces sold	Amount		Ounces sold	Amount		Ounces sold	Amount		Ounces sold
	Gold	$	66,511	52,176	$	72,649	52,713	$	217,458	168,696	$	172,567	121,481
	Silver	10,401		535,407	4,092		184,082	28,102		1,416,473	12,362		505,151
		$	76,912		$	76,741		$	245,560		$	184,929

Separation_and_Severance_Costs

Separation and Severance Costs	9 Months Ended
	Sep. 30, 2014
Restructuring and Related Activities [Abstract]	'
Separation and Severance Costs	'
	12. Separation and Severance Costs
	The tables below summarize the Company’s separation and severance costs by type of cost and the reportable segment to which they relate (in thousands):
		Three months ended September 30,				Nine months ended September 30,
	Type of cost	2014		2013		2014		2013
	One time, cash payments	$	—	$	3,011	$	—	$	4,809
	Stock-based compensation costs from continued vesting	—		—		—		1,124
		$	—	$	3,011	$	—	$	5,933
		Three months ended September 30,				Nine months ended September 30,
	Reportable segment	2014		2013		2014		2013
	Hycroft Mine	$	—	$	1,860	$	—	$	1,860
	Exploration	—		381		—		405
	Corporate and Other	—		770		—		3,668
		$	—	$	3,011	$	—	$	5,933

Other_Net

Other, Net	9 Months Ended
	Sep. 30, 2014
Other, Net [Abstract]	'
Other, Net	'
	13. Other, Net
	The table below is a summary of the Company’s other income and expense (in thousands):
		Three months ended September 30,						Nine months ended September 30,
		2014			2013			2014			2013
	Foreign currency transaction gain (loss) on Notes - Note 18	$	17,800		$	(8,400	)	$	19,200		13,120
	Reclassification of (loss) gain into earnings from Accumulated other comprehensive income for cross currency swap - Note 18	(17,800		)	8,400			(19,200		)	(13,120		)
	Gain (loss) on marketable equity securities	—			290			—			(677		)
	Other	18			53			(20		)	119
		$	18		$	343		$	(20	)	$	(558	)

Income_Tax_Benefit

Income Tax Benefit	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Tax Benefit	'
	14. Income Tax Benefit
	For the nine months ended September 30, 2014, the Company recorded income tax benefit of approximately $20.5 million which included a $23.7 million income tax benefit from loss based on an estimated annual effective rate of approximately 30.3% and $3.2 million of additional income tax expense for discrete items primarily related to stock-based compensation and return to provision adjustments that were recognized as incurred in the current quarter. The estimated annual effective tax rate varied from the United States statutory tax rate of 35% primarily due to an increase in valuation allowance established against deferred tax assets expected to be generated in the current year.
	For the nine months ended September 30, 2013, the Company recorded income tax benefit of approximately $1.8 million based on an estimated annual effective rate of 10.0%. The estimated annual effective tax rate varied from the United States statutory tax rate of 35% primarily due to the effects of the percentage depletion deduction.
	Historically, the Company has not been subject to state or foreign income taxes as all of the Company’s operations and properties are located within Nevada, which does not impose a state income tax. As necessary, the Company provides a reserve against the benefits of uncertain tax positions taken in its tax filings that are not more likely than not to be sustained upon examination. Based on the weight of available evidence, the Company does not believe it has taken any uncertain tax positions that require the establishment of a reserve. The Company has not recorded any interest or penalties related to income tax liabilities as of September 30, 2014.

Loss_Income_Per_Share

(Loss) Income Per Share	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
(Loss) Income Per Share	'
	15. (Loss) Income Per Share
	The following table sets forth the computation of basic and diluted (loss) income per share (in thousands, except per share amounts):
		Three months ended September 30,					Nine months ended September 30,
		2014			2013		2014			2013
	Net (loss) income available to common stockholders:	$	(62,414	)	$	4,971	$	(57,706	)	$	18,019
	Weighted average common shares:
	Basic	104,852			104,416		104,728			97,297
	Effect of shares granted under the:
	Restricted Share Unit Plan	—			1,045		—			988
	Deferred Phantom Unit Plan	—			248		—			248
	Deferred Share Unit Plan	—			130		—			97
	2007 Stock Option Plan	—			83		—			319
	Diluted	104,852			105,922		104,728			98,949
	(Loss) income per share:
	Basic	$	(0.60	)	$	0.05	$	(0.55	)	$	0.19
	Diluted	$	(0.60	)	$	0.05	$	(0.55	)	$	0.18
	During the three and nine months ended September 30, 2014, the Company’s basic average common shares and diluted average common shares were the same because the effects of potential shares of common stock was anti-dilutive due to the Company’s net loss. Had the Company generated net income, during the three and nine months ended September 30, 2014, the effects from 1,833,828 restricted share units, 380,560 deferred share units, and 248,136 deferred phantom units would have been included in the diluted average common shares calculation.

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2014
Postemployment Benefits [Abstract]	'
Stock-Based Compensation	'
	16. Stock-Based Compensation
	As of September 30, 2014, the Company’s stock-based compensation plans included the Deferred Phantom Unit Plan, the Deferred Share Unit Plan, and the Performance and Incentive Pay Plan (the “PIP Plan”).
	Stockholder Approval of Performance and Incentive Pay Plan
	At the Company’s May 1, 2014 Annual Meeting of Stockholders, the Company’s stockholders approved the PIP Plan, which includes a stock-based compensation plan that terminates and replaces the 2007 Stock Option Plan and the Restricted Share Unit Plan (together, the “Former Plans”). The Company is no longer permitted to grant awards under the Former Plans; however, awards made under the Former Plans prior to May 1, 2014 will continue to vest in accordance with the provisions of the grants and pursuant to the terms of the Former Plans.
	The PIP Plan makes available up to 4,000,000 shares of common stock for awards to officers, employees, directors, and consultants, which may be granted in a variety of forms, including restricted stock, restricted stock units, stock options, stock appreciation rights, performance awards, and other stock awards. The terms and conditions of awards granted under the PIP Plan are established by the Compensation Committee of the Board of Directors, who also administers the PIP Plan.
	The following tables summarize the Company’s stock-based compensation cost and unrecognized stock-based compensation cost by plan (in thousands):
		Three months ended September 30,						Nine months ended September 30,
	Stock-based compensation cost by plan	2014			2013			2014		2013
	Restricted Share Unit	$	1,289		$	1,005		$	4,006	$	4,568
	Performance and Incentive Pay	139			—			204		—
	Deferred Share Unit	200			212			662		737
		$	1,628		$	1,217		$	4,872	$	5,305
		September 30,
	Unrecognized stock-based compensation cost by plan	2014			2013
	Restricted Share Unit	$	8,211		$	12,115
	Performance and Incentive Pay	818			—
	Deferred Share Unit	400			525
		$	9,429		$	12,640
	The following table summarizes awards and activity of the Company’s stock-based compensation plans:
		Nine months ended September 30, 2014
		Restricted		Performance and Incentive Pay			Deferred		2007 Stock	Deferred
		Share Unit					Share Unit		Option	Phantom Unit
	Outstanding on January 1,	1,630,145		—			134,408		500,000	248,136
	Granted	1,003,800		378,790			246,152		—	—
	Issued/exercised	(382,667	)	(12,500	)		—		—	—
	Canceled/forfeited	(225,205	)	(63,419	)		—		—	—
	Outstanding, end of period	2,026,073		302,871			380,560		500,000	248,136
	Vested and unissued/exercisable, end of period	495,116		—			257,484		500,000	248,136
	All awards granted under the PIP Plan have been in the form of restricted stock units.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	17. Fair Value Measurements
	Fair value accounting establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below:
	Level 1 – Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis;
	Level 2 – Quoted prices in markets that are not active, or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability; and
	Level 3 – Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (supported by little or no market activity).
	Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Certain financial instruments, including cash and equivalents, accounts receivable, prepaids and other, accounts payable, and other liabilities, are carried at cost, which approximates fair value due to the short-term nature of these instruments. There were no changes to the Company’s valuation techniques and no transfers in or out of Levels 1 or 2 during the three and nine months ended September 30, 2014.
	The following table sets forth by level, within the fair value hierarchy, the Company’s assets and liabilities measured at fair value on a recurring basis (in thousands).
	Assets	30-Sep-14		31-Dec-13		Input Hierarchy
						Level
	Assets held for sale	$	45,564	$	47,357	Level 2
	Liabilities
	Derivative instruments:
	Cross currency swap - Note 18	$	36,800	$	22,399	Level 2
	Diesel swap agreements - Note 18	181		—		Level 2
		$	36,981	$	22,399
	The Company’s assets held for sale are valued using a market approach for each item of property and equipment held for sale. Inputs include quoted market prices for identical or similar assets in markets that are not active and, as such, property and equipment held for sale is classified within Level 2 of the fair value hierarchy. Periodic changes in fair value (less costs to sell) to assets held for sale are included in Loss on assets classified as held for sale and asset dispositions, net.
	The Company’s derivative instruments are valued using models which require a variety of inputs, including contractual terms, market prices, yield curves, credit spreads, and correlations of such inputs. Some of the model inputs used in valuing the derivative instruments trade in liquid markets and, as such, model inputs can generally be verified and do not involve significant management judgment. Derivative instruments are classified within Level 2 of the fair value hierarchy and included in Other liabilities, current and non-current.
	Items Disclosed at Fair Value
	Using prevailing interest rates on similar debt issuances, credit spreads, and foreign currency forward rates, the estimated fair value of the Notes was $333.7 million at September 30, 2014. The fair value estimate of the Notes was prepared with the assistance of an independent third party and does not reflect the Notes actual trading value or the carrying value of the Notes in the Company’s condensed consolidated financial statements.

Derivative_Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Instruments	'
	18. Derivative Instruments
	Derivative Instrument Fair Values
	The following table is a summary of the fair values of the Company’s derivative instruments and the location in which they are recorded (in thousands):
			30-Sep-14						31-Dec-13
			Other liabilities,			Other liabilities,			Other liabilities,			Other liabilities,
			current			non-current			current			non-current
	Cross currency swap		$	1,544		$	35,256		$	669		$	21,730
	Diesel swap agreements		141			40			—			—
			$	1,685		$	35,296		$	669		$	21,730
	Derivative Instruments Designated as Hedges – Cash Flow Hedges
	Diesel Swap Agreements
	As of September 30, 2014, the Company had outstanding diesel swaps covering the 2015 year for 3.0 million gallons (0.25 million gallons per month) at an average price of $2.70 per gallon, which represents approximately 28% of the Company’s forecasted 2015 diesel consumption. As of December 31, 2013, the Company had no unsettled diesel swaps. Gains and losses in Accumulated other comprehensive income from previously settled diesel swaps are reclassified into earnings (Production costs) as the hedged transaction impacts earnings (as specific gold ounces are sold).
	Cross Currency Swap
	In May 2012, the Company entered into a cross currency swap concurrent with the issuance of the Notes. The notional value of the cross currency swap was $400.4 million and the interest rate was fixed at 8.375%. The Company makes interest payments ($400.4 million at 8.375%) to the counterparty in exchange for the Canadian dollars required to service the Notes (CDN$400.0 million at 8.75%). Upon maturity the Company will pay $400.4 million to the counterparty and receive CDN $400.0 million, which will be used to satisfy the face amount of the issuance. As discussed in Note 10 - Debt, the Company is required to fully collateralize any mark-to-market liability position of 22% of the cross currency swap.
	Accumulated Other Comprehensive Income (Loss)
	The following table sets forth changes in accumulated other comprehensive income (loss) and the impacts cash flow hedges had on the Company’s earnings (in thousands):
		Nine months ended September 30, 2014
		Cross Currency			Diesel Swap			Tax			Total
		Swap			Agreements			Effects
	Balance, beginning of period	$	1,920		$	653		$	(899	)	$	1,674
	Change in fair value of effective portion of unsettled cash flow hedge instruments	4,799			(180		)	(1,617		)	3,002
	Settlements of cash flow hedges	(20,532		)	—			7,186			(13,346		)
	Reclassifications into earnings when underlying hedged transactions impacted earnings:
	Reclassified to Interest expense	1,332			—			(466		)	866
	Reclassified to Other, net	19,200			—			(6,720		)	12,480
	Reclassified to Production costs	—			(476		)	167			(309		)
	Balance, end of period	$	6,719		$	(3	)	$	(2,349	)	$	4,367
		Nine months ended September 30, 2013
		Cross Currency			Diesel Swap			Tax			Total
		Swap			Agreements			Effects
	Balance, beginning of period	$	(9,574	)	$	1,241		$	2,917		$	(5,416	)
	Change in fair value of effective portion of unsettled cash flow hedge instruments	5,781			(248		)	(1,937		)	3,596
	Settlements of cash flow hedges	(12,927		)	534			4,338			(8,055		)
	Reclassifications into earnings when underlying hedged transactions impacted earnings:
	Reclassified to Interest expense	(193		)	—			68			(125		)
	Reclassified to Other, net	13,120			—			(4,592		)	8,528
	Reclassified to Production costs	—			(695		)	243			(452		)
	Balance, end of period	$	(3,793	)	$	832		$	1,037		$	(1,924	)

Segment_Information

Segment Information	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Segment Information	'
	19. Segment Information
	The Company is engaged in the operation of the Hycroft Mine and the evaluation, exploration, and advancement of gold exploration and development projects in Nevada. Our segments are defined as components of the Company for which separate financial information is available that is evaluated regularly by the executive decision-making group in assessing performance, establishing operating plans and budgets, and deciding how to allocate resources. Segment information as of and for the three and nine months ended September 30, 2014 and 2013 is as follows (in thousands):
	Three months ended September 30,	Hycroft			Exploration			Corporate			Total
		Mine						and Other
	2014
	Revenue - Note 11	$	76,912		$	—		$	—		$	76,912
	Depreciation and amortization	16,063			—			245			16,308
	Write-down of production inventories - Note 4	70,690			—			—			70,690
	Loss from operations	(66,082		)	(3,298		)	(5,535		)	(74,915		)
	Interest income	1			—			2			3
	Interest expense - Note 10	(2,491		)	—			(8,867		)	(11,358		)
	Other, net - Note 13	(42		)	60			—			18
	Loss before income taxes	(68,614		)	(3,238		)	(14,400		)	(86,252		)
	Total assets	1,302,629			35,517			56,373			1,394,519
	Capital expenditures	$	6,304		$	—		$	—		$	6,304
	2013
	Revenue - Note 11	$	76,741		$	—		$	—		$	76,741
	Depreciation and amortization	9,346			—			261			9,607
	Income (loss) from operations	13,299			(2,762		)	(4,708		)	5,829
	Interest income	2			—			75			77
	Interest expense - Note 10	(2,912		)	—			(2,449		)	(5,361		)
	Other, net - Note 13	49			—			294			343
	Income (loss) before income taxes	10,438			(2,762		)	(6,788		)	888
	Total assets	1,348,593			38,743			143,331			1,530,667
	Capital expenditures	$	89,938		$	51		$	—		$	89,989
	Nine months ended September 30,	Hycroft			Exploration			Corporate			Total
		Mine						and Other
	2014
	Revenue - Note 11	$	245,560		$	—		$	—		$	245,560
	Depreciation and amortization	46,818			—			755			47,573
	Write-down of production inventories - Note 4	70,690			—			—			70,690
	(Loss) income from operations	(46,438		)	14,788			(18,039		)	(49,689		)
	Interest income	6			—			12			18
	Interest expense - Note 10	(7,037		)	—			(21,437		)	(28,474		)
	Other, net - Note 13	(6		)	60			(74		)	(20		)
	(Loss) income before income taxes	(53,475		)	14,848			(39,538		)	(78,165		)
	Total assets	1,302,629			35,517			56,373			1,394,519
	Capital expenditures	$	73,918		$	—		$	—		$	73,918
	2013
	Revenue - Note 11	$	184,929		$	—		$	—		$	184,929
	Depreciation and amortization	18,406			—			788			19,194
	Income (loss) from operations	55,059			(4,952		)	(19,938		)	30,169
	Interest income	10			—			305			315
	Interest expense - Note 10	(6,937		)	—			(6,746		)	(13,683		)
	Other, net - Note 13	115			—			(673		)	(558		)
	Income (loss) before income taxes	48,247			(4,952		)	(27,052		)	16,243
	Total assets	1,348,593			38,743			143,331			1,530,667
	Capital expenditures	$	398,785		$	51		$	149		$	398,985

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	20. Commitments and Contingencies
	The Company is from time to time involved in various legal actions related to its business, some of which are class actions lawsuits. Management does not believe, based on currently available information, that contingencies related to any pending or threatened legal matter will have a material adverse effect on the Company’s financial statements, although a contingency could be material to the Company’s results of operations or cash flows for a particular period depending on the results of operations and cash flows for such period. Regardless of the outcome, litigation can have an adverse impact on the Company because of defense and settlement costs, diversion of management resources, and other factors.
	Financial Commitments Not Recorded in the Condensed Consolidated Financial Statements
	Purchase Obligations
	At September 30, 2014, the Company had purchase obligations totaling $12.3 million for the purchase of mill components and capital items associated with the expansion projects of the Hycroft Mine. The Company expects purchase obligations to be satisfied through cash payments.
	Temporary Housing Space Rental and Service Agreement
	The Company leases a temporary housing complex in Winnemucca, NV to provide lodging for employees, contractors, and consultants. The temporary housing complex is leased from a third party who maintains the property and grounds. The Company estimates the remaining payments due under the temporary housing space rental and service agreement will approximate $0.4 million in 2014, $3.6 million in 2015, and $0.1 million in 2016.
	Net Profit Royalty
	A portion of the Hycroft Mine is subject to a mining lease that requires a 4% net profit royalty be paid to the owner of certain patented and unpatented mining claims. The mining lease also requires an annual advance payment of $120,000 every year mining occurs on the leased claims. All advance annual payments are credited against the future payments due under the 4% net profit royalty. The total payments due under the mining lease are capped at $7.6 million, of which the Company has paid approximately $2.1 million through September 30, 2014. The Company currently estimates the remaining payments due under the mining lease will approximate $0.3 million in 2015, $1.5 million in 2016, $3.0 million in 2017, and $0.7 million in 2018.
	Letters of credit
	As discussed in Note 10 - Debt and Note 18 - Derivative Instruments, the Company had issued $11.4 million of financial letters of credit under the Revolver to collateralize a portion of the cross currency swap’s liability position. The Company was in compliance with all debt covenants as of September 30, 2014 and projects future compliance; however, an event of default, if not cured, could result in the Company losing availability to the Revolver which may require the portion of the cross currency swap currently collateralized with letters of credit to be collateralized entirely with cash.

Accounting_Pronouncements_Poli

Accounting Pronouncements (Policies)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Recently Issued, Policy	'
	Recently Issued
	In April 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-08, “Reporting Discontinued Operations and Disclosures of Disposals of a Component of an Entity.” ASU 2014-08 changes the criteria for reporting discontinued operations and requires new disclosures for discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. ASU 2014-08 is effective for fiscal years, and interim periods within those years, beginning on or after December 15, 2014, which for the Company means the first quarter of the year ending December 31, 2015. Other than the additional presentation and disclosure requirements, the adoption of this guidance is not expected to have a material effect on the Company’s consolidated financial position, results of operations, or cash flows.
	In May 2014, the FASB and the International Accounting Standards Board issued new joint and converged guidance surrounding revenue recognition. ASU 2014-09, “Revenue from Contracts with Customers” will supersede nearly all existing revenue recognition guidance, including industry-specific guidance, and requires that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 does not permit early adoption and is effective for fiscal years, and interim periods within those years, beginning on or after December 15, 2016, which for the Company means the first quarter of the year ending December 31, 2017. ASU 2014-09 allows for either a “full retrospective” adoption, meaning the new standard is applied to all periods presented, or a “modified retrospective” adoption, meaning the new standard is applied only to the most current period presented and any cumulative effect of adoption is recognized as an adjustment to the opening balance of retained earnings. The Company has evaluated its current revenue recognition policies and past and present sales contracts and does not currently believe it will be materially impacted by the requirements of ASU 2014-09. Historically, the Company’s sole revenue related performance obligation has been the delivery of metal to customers, either physically or by account transfer, and has been satisfied at the same point in time the Company’s customers obtain control of the delivered metal. As such, the Company currently anticipates adopting ASU 2014-09 using the “modified retrospective” approach and other than the additional presentation and disclosure requirements, does not expect such adoption will have a material effect on the Company’s consolidated financial position, results of operations, or cash flows.
	In August 2014, the FASB issued ASU No. 2014-15, “Presentation of Financial Statements - Going Concern.” ASU 2014-15 requires management to assess, at each interim and annual reporting period, whether substantial doubt exists about an entity’s ability to continue as a going concern within one year after the date that the financial statements are issued and, when necessary, provide related footnote disclosures. Management’s assessment should be based on relevant conditions and events that are known and reasonably knowable at the date that the financial statements are issued. ASU 2014-15 is effective for fiscal years ending after December 15, 2016, which for the Company means the year ending December 31, 2016; however, early adoption is permitted. Other than the additional presentation and disclosure requirements, the adoption of this guidance is not expected to have a material effect on the Company’s consolidated financial position, results of operations, or cash flows.

Inventories_Tables

Inventories (Tables)	9 Months Ended
	Sep. 30, 2014
Inventory Disclosure [Abstract]	'
Components of Inventories and Estimated Recoverable Gold Ounces	'
	The following table provides the components of inventories and the estimated recoverable gold ounces therein (in thousands, except ounces):
		30-Sep-14			31-Dec-13
		Amount		Gold ounces	Amount		Gold ounces
	Materials and supplies	$	16,349		$	18,002
	Merrill-Crowe in-process	4,794		3,490	6,322		5,662
	Carbon column in-process	867		655	859		724
	Doré finished goods	1,716		1,258	1,227		1,106
		$	23,726	5,403	$	26,410	7,492

Stockpiles_and_Ore_On_Leach_Pa1

Stockpiles and Ore On Leach Pads (Tables)	9 Months Ended
	Sep. 30, 2014
Stockpiles and Ore On Leach Pads [Abstract]	'
Summary of Stockpiles and Ore on Leach Pads and Estimated Recoverable Gold Ounces	'
	The following table summarizes stockpiles and ore on leach pads and the estimated recoverable gold ounces therein (in thousands, except ounces):
		30-Sep-14			31-Dec-13
		Amount		Gold ounces	Amount		Gold ounces
	Current:
	Ore on leach pads	$	188,263	163,962	$	206,504	180,919
	Non-current:
	Ore on leach pads	$	80,684	70,269	$	88,501	77,537
	Stockpiles	41,040		79,014	27,691		61,771
		$	121,724	149,283	$	116,192	139,308

Prepaids_and_Other_Assets_Tabl

Prepaids and Other Assets (Tables)	9 Months Ended
	Sep. 30, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]	'
Components of Prepaid and Other Assets	'
	The following table provides the components of prepaids and other assets (in thousands):
		30-Sep-14		31-Dec-13
	Prepaids and other
	Prepaids	$	4,734	$	6,083
	Deposits	1,224		1,685
	Federal income taxes receivable	605		2,914
	Other	89		175
		$	6,652	$	10,857
	Other assets, non-current
	Debt issuance costs, net	$	11,048	$	12,208
	Reclamation policy premium, net	385		474
	Cash collateral for cross currency swap - Note 10	480		—
		$	11,913	$	12,682

Restricted_Cash_Tables

Restricted Cash (Tables)	9 Months Ended
	Sep. 30, 2014
Cash and Cash Equivalents [Abstract]	'
Components of Restricted Cash	'
	The following table provides the components of restricted cash (in thousands):
	Obligation collateralized	30-Sep-14		31-Dec-13
	Asset retirement obligation surety bonds	$	38,140	$	41,215
	Revolving credit agreement - Note 10	10,000		—
		$	48,140	$	41,215

Plant_Equipment_and_Mine_Devel1

Plant, Equipment, and Mine Development, Net (Tables)	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Components of Plant, Equipment and Mine Development	'
	The following table provides the components of plant, equipment, and mine development, net (in thousands):
		Depreciable life or method	30-Sep-14			31-Dec-13
	Mine equipment	5 - 7 years	$	298,026		$	312,425
	Process equipment	Units-of-production	274,757			60,875
	Mine development	Units-of-production	126,197			120,038
	Leach pads	Units-of-production	81,446			78,737
	Buildings and leasehold improvements	10 years	25,640			25,083
	Furniture, fixtures, and office equipment	2 - 3 years	4,417			4,236
	Vehicles	3 - 5 years	2,943			2,943
	Construction in progress and other		240,342			421,117
			1,053,768			1,025,454
	Less: accumulated depreciation and amortization		(189,023		)	(135,183		)
			$	864,745		$	890,271

Mineral_Properties_Net_Tables

Mineral Properties, Net (Tables)	9 Months Ended
	Sep. 30, 2014
Mineral Properties, Net [Abstract]	'
Summary of Gains and Losses on Dispositions and Sales of Mineral Properties	'
	The table below is a summary of the Company’s gains and losses on dispositions and sales of mineral properties (in thousands):
		Three months ended September 30,						Nine months ended September 30,
		2014			2013			2014			2013
	Loss on dispositions of early-stage exploration properties	$	(2,679	)	$	(1,441	)	$	(2,679	)	$	(1,441	)
	Gain on sale of a 75% controlling interest in the Hasbrouck, Three Hills, and Esmeralda County properties	—			—			19,480			—
		$	(2,679	)	$	(1,441	)	$	16,801		$	(1,441	)

Other_Liabilities_Tables

Other Liabilities (Tables)	9 Months Ended
	Sep. 30, 2014
Other Liabilities Disclosure [Abstract]	'
Components of Other Liabilities, Current and Non-current	'
	The following table summarizes the components of other liabilities, current and non-current (in thousands):
		30-Sep-14		31-Dec-13
	Other liabilities, current
	Accrued compensation	$	5,333	$	3,587
	Derivative instruments - Note 18	1,685		669
	Capital expenditure retentions	—		4,256
	Other	141		—
		$	7,159	$	8,512
	Other liabilities, non-current
	Derivative instruments - Note 18	$	35,296	$	21,730
	Accounts payable	5,188		—
	Deferred royalty income	958		953
	Other	56		52
		$	41,498	$	22,735

Debt_Tables

Debt (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Summary of Components of Debt	'
	The following table summarizes the components of debt (in thousands):
		30-Sep-14				31-Dec-13
	Debt, current:
	Capital lease and term loan obligations	$	53,366		(1)	$	58,435		(1)
	Term and Security Deposit loan	17,791			(2)	17,791			(2)
		$	71,157			$	76,226
	Debt, non-current:
	Capital lease and term loan obligations	$	110,284			$	146,347
	Revolving Credit Agreement	5,000				—
	8.75% Senior Notes due June 2019 (3)	356,881				376,080
		$	472,165			$	522,427
	(1)  Includes borrowings of $8.9 million and $5.7 million as of September 30, 2014 and December 31, 2013, respectively, for mine equipment included in Assets held for sale.
	(2)  Entire borrowing is attributable to the third rope shovel which is included in Assets held for sale.
	(3)   Effective interest rate of 8.375% after cross currency swap. See Note 18 - Derivative Instruments for additional detail.
Future Minimum Capital Lease Obligation Payments, Including Interest	'
	The following is a summary of the future minimum payments under the Company’s capital lease and term loan obligations as of September 30, 2014 (in thousands):
	Fiscal Year	Minimum Lease
		Payments
	2014	$	22,499		(1)
	2015	49,898
	2016	47,392
	2017	32,941
	2018	11,885
	Thereafter	15,421
	Less: interest	(16,386		)
	Net minimum capital lease payments	163,650
	Less: current portion	(53,366		)
	Non-current portion	$	110,284
	(1)  Includes principal of $8.9 million for mine equipment included in Assets held for sale.
Summary of Components of Interest Expense	'
	The following table summarizes the components of interest expense (in thousands):
		Three months ended September 30,								Nine months ended September 30,
		2014				2013				2014			2013
	8.75% Senior Notes due June 2019 (1)	$	8,452			$	8,452			$	25,081		$	25,219
	Capital lease and term loan obligations	2,124				1,989				5,943			5,441
	Amortization of debt issuance costs	740				664				2,047			1,909
	Revolver interest and standby fees	341				385				858			1,010
	Term and Security Deposit loan	226				755				671			1,105
	Other interest expense	141				368				424			592
	Capitalized interest	(666		)		(7,252		)		(6,550		)	(21,593		)
		$	11,358			$	5,361			$	28,474		$	13,683
	(1) Effective interest rate of 8.375% after cross currency swap. See Note 18 - Derivative Instruments for additional detail.

Revenue_Tables

Revenue (Tables)	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Summary of Revenue from Gold and Silver Revenue	'
	The table below is a summary of the Company’s gold and silver revenue (in thousands, except ounces sold):
		Three months ended September 30,						Nine months ended September 30,
		2014			2013			2014			2013
		Amount		Ounces sold	Amount		Ounces sold	Amount		Ounces sold	Amount		Ounces sold
	Gold	$	66,511	52,176	$	72,649	52,713	$	217,458	168,696	$	172,567	121,481
	Silver	10,401		535,407	4,092		184,082	28,102		1,416,473	12,362		505,151
		$	76,912		$	76,741		$	245,560		$	184,929

Separation_and_Severance_Costs1

Separation and Severance Costs (Tables)	9 Months Ended
	Sep. 30, 2014
Restructuring and Related Activities [Abstract]	'
Summary of Separation and Severance Costs by Type of Cost	'
	The tables below summarize the Company’s separation and severance costs by type of cost and the reportable segment to which they relate (in thousands):
		Three months ended September 30,				Nine months ended September 30,
	Type of cost	2014		2013		2014		2013
	One time, cash payments	$	—	$	3,011	$	—	$	4,809
	Stock-based compensation costs from continued vesting	—		—		—		1,124
		$	—	$	3,011	$	—	$	5,933
Summary of Separation and Severance Costs by Reportable Segment	'
		Three months ended September 30,				Nine months ended September 30,
	Reportable segment	2014		2013		2014		2013
	Hycroft Mine	$	—	$	1,860	$	—	$	1,860
	Exploration	—		381		—		405
	Corporate and Other	—		770		—		3,668
		$	—	$	3,011	$	—	$	5,933

Other_Net_Tables

Other, Net (Tables)	9 Months Ended
	Sep. 30, 2014
Other, Net [Abstract]	'
Schedule of Other Operating Cost and Expense, by Component	'
	The table below is a summary of the Company’s other income and expense (in thousands):
		Three months ended September 30,						Nine months ended September 30,
		2014			2013			2014			2013
	Foreign currency transaction gain (loss) on Notes - Note 18	$	17,800		$	(8,400	)	$	19,200		13,120
	Reclassification of (loss) gain into earnings from Accumulated other comprehensive income for cross currency swap - Note 18	(17,800		)	8,400			(19,200		)	(13,120		)
	Gain (loss) on marketable equity securities	—			290			—			(677		)
	Other	18			53			(20		)	119
		$	18		$	343		$	(20	)	$	(558	)

Loss_Income_Per_Share_Tables

(Loss) Income Per Share (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Computation of Basic and Diluted (Loss) Income Per Share	'
	The following table sets forth the computation of basic and diluted (loss) income per share (in thousands, except per share amounts):
		Three months ended September 30,					Nine months ended September 30,
		2014			2013		2014			2013
	Net (loss) income available to common stockholders:	$	(62,414	)	$	4,971	$	(57,706	)	$	18,019
	Weighted average common shares:
	Basic	104,852			104,416		104,728			97,297
	Effect of shares granted under the:
	Restricted Share Unit Plan	—			1,045		—			988
	Deferred Phantom Unit Plan	—			248		—			248
	Deferred Share Unit Plan	—			130		—			97
	2007 Stock Option Plan	—			83		—			319
	Diluted	104,852			105,922		104,728			98,949
	(Loss) income per share:
	Basic	$	(0.60	)	$	0.05	$	(0.55	)	$	0.19
	Diluted	$	(0.60	)	$	0.05	$	(0.55	)	$	0.18

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2014
Postemployment Benefits [Abstract]	'
Stock-Based Compensation Cost (Benefit)	'
	The following tables summarize the Company’s stock-based compensation cost and unrecognized stock-based compensation cost by plan (in thousands):
		Three months ended September 30,						Nine months ended September 30,
	Stock-based compensation cost by plan	2014			2013			2014		2013
	Restricted Share Unit	$	1,289		$	1,005		$	4,006	$	4,568
	Performance and Incentive Pay	139			—			204		—
	Deferred Share Unit	200			212			662		737
		$	1,628		$	1,217		$	4,872	$	5,305
Unrecognized Stock-Based Compensation Cost by Plan	'
		September 30,
	Unrecognized stock-based compensation cost by plan	2014			2013
	Restricted Share Unit	$	8,211		$	12,115
	Performance and Incentive Pay	818			—
	Deferred Share Unit	400			525
		$	9,429		$	12,640
Activity of Stock-Based Compensation Plans	'
	The following table summarizes awards and activity of the Company’s stock-based compensation plans:
		Nine months ended September 30, 2014
		Restricted		Performance and Incentive Pay			Deferred		2007 Stock	Deferred
		Share Unit					Share Unit		Option	Phantom Unit
	Outstanding on January 1,	1,630,145		—			134,408		500,000	248,136
	Granted	1,003,800		378,790			246,152		—	—
	Issued/exercised	(382,667	)	(12,500	)		—		—	—
	Canceled/forfeited	(225,205	)	(63,419	)		—		—	—
	Outstanding, end of period	2,026,073		302,871			380,560		500,000	248,136
	Vested and unissued/exercisable, end of period	495,116		—			257,484		500,000	248,136

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Financial Instruments Measured at Fair Value on Recurring Basis	'
	The following table sets forth by level, within the fair value hierarchy, the Company’s assets and liabilities measured at fair value on a recurring basis (in thousands).
	Assets	30-Sep-14		31-Dec-13		Input Hierarchy
						Level
	Assets held for sale	$	45,564	$	47,357	Level 2
	Liabilities
	Derivative instruments:
	Cross currency swap - Note 18	$	36,800	$	22,399	Level 2
	Diesel swap agreements - Note 18	181		—		Level 2
		$	36,981	$	22,399

Derivative_Instruments_Tables

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Instruments Designated as Cash Flow Hedges	'
	The following table is a summary of the fair values of the Company’s derivative instruments and the location in which they are recorded (in thousands):
			30-Sep-14						31-Dec-13
			Other liabilities,			Other liabilities,			Other liabilities,			Other liabilities,
			current			non-current			current			non-current
	Cross currency swap		$	1,544		$	35,256		$	669		$	21,730
	Diesel swap agreements		141			40			—			—
			$	1,685		$	35,296		$	669		$	21,730
Changes in Accumulated Other Comprehensive Income (Loss) and Effect of the Cash Flow Hedges	'
	The following table sets forth changes in accumulated other comprehensive income (loss) and the impacts cash flow hedges had on the Company’s earnings (in thousands):
		Nine months ended September 30, 2014
		Cross Currency			Diesel Swap			Tax			Total
		Swap			Agreements			Effects
	Balance, beginning of period	$	1,920		$	653		$	(899	)	$	1,674
	Change in fair value of effective portion of unsettled cash flow hedge instruments	4,799			(180		)	(1,617		)	3,002
	Settlements of cash flow hedges	(20,532		)	—			7,186			(13,346		)
	Reclassifications into earnings when underlying hedged transactions impacted earnings:
	Reclassified to Interest expense	1,332			—			(466		)	866
	Reclassified to Other, net	19,200			—			(6,720		)	12,480
	Reclassified to Production costs	—			(476		)	167			(309		)
	Balance, end of period	$	6,719		$	(3	)	$	(2,349	)	$	4,367
		Nine months ended September 30, 2013
		Cross Currency			Diesel Swap			Tax			Total
		Swap			Agreements			Effects
	Balance, beginning of period	$	(9,574	)	$	1,241		$	2,917		$	(5,416	)
	Change in fair value of effective portion of unsettled cash flow hedge instruments	5,781			(248		)	(1,937		)	3,596
	Settlements of cash flow hedges	(12,927		)	534			4,338			(8,055		)
	Reclassifications into earnings when underlying hedged transactions impacted earnings:
	Reclassified to Interest expense	(193		)	—			68			(125		)
	Reclassified to Other, net	13,120			—			(4,592		)	8,528
	Reclassified to Production costs	—			(695		)	243			(452		)
	Balance, end of period	$	(3,793	)	$	832		$	1,037		$	(1,924	)

Segment_Information_Tables

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Segment Information	'
	Segment information as of and for the three and nine months ended September 30, 2014 and 2013 is as follows (in thousands):
	Three months ended September 30,	Hycroft			Exploration			Corporate			Total
		Mine						and Other
	2014
	Revenue - Note 11	$	76,912		$	—		$	—		$	76,912
	Depreciation and amortization	16,063			—			245			16,308
	Write-down of production inventories - Note 4	70,690			—			—			70,690
	Loss from operations	(66,082		)	(3,298		)	(5,535		)	(74,915		)
	Interest income	1			—			2			3
	Interest expense - Note 10	(2,491		)	—			(8,867		)	(11,358		)
	Other, net - Note 13	(42		)	60			—			18
	Loss before income taxes	(68,614		)	(3,238		)	(14,400		)	(86,252		)
	Total assets	1,302,629			35,517			56,373			1,394,519
	Capital expenditures	$	6,304		$	—		$	—		$	6,304
	2013
	Revenue - Note 11	$	76,741		$	—		$	—		$	76,741
	Depreciation and amortization	9,346			—			261			9,607
	Income (loss) from operations	13,299			(2,762		)	(4,708		)	5,829
	Interest income	2			—			75			77
	Interest expense - Note 10	(2,912		)	—			(2,449		)	(5,361		)
	Other, net - Note 13	49			—			294			343
	Income (loss) before income taxes	10,438			(2,762		)	(6,788		)	888
	Total assets	1,348,593			38,743			143,331			1,530,667
	Capital expenditures	$	89,938		$	51		$	—		$	89,989
	Nine months ended September 30,	Hycroft			Exploration			Corporate			Total
		Mine						and Other
	2014
	Revenue - Note 11	$	245,560		$	—		$	—		$	245,560
	Depreciation and amortization	46,818			—			755			47,573
	Write-down of production inventories - Note 4	70,690			—			—			70,690
	(Loss) income from operations	(46,438		)	14,788			(18,039		)	(49,689		)
	Interest income	6			—			12			18
	Interest expense - Note 10	(7,037		)	—			(21,437		)	(28,474		)
	Other, net - Note 13	(6		)	60			(74		)	(20		)
	(Loss) income before income taxes	(53,475		)	14,848			(39,538		)	(78,165		)
	Total assets	1,302,629			35,517			56,373			1,394,519
	Capital expenditures	$	73,918		$	—		$	—		$	73,918
	2013
	Revenue - Note 11	$	184,929		$	—		$	—		$	184,929
	Depreciation and amortization	18,406			—			788			19,194
	Income (loss) from operations	55,059			(4,952		)	(19,938		)	30,169
	Interest income	10			—			305			315
	Interest expense - Note 10	(6,937		)	—			(6,746		)	(13,683		)
	Other, net - Note 13	115			—			(673		)	(558		)
	Income (loss) before income taxes	48,247			(4,952		)	(27,052		)	16,243
	Total assets	1,348,593			38,743			143,331			1,530,667
	Capital expenditures	$	398,785		$	51		$	149		$	398,985

Basis_of_Presentation_Basis_of

Basis of Presentation Basis of Presentation (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basis of Presentation [Line Items]	'	'	'	'
Loss on disposal of mineral properties	($2,679)	($1,441)	$16,801	($1,441)
Loss on equipment held for sale	-897	-298	-6,876	-298
Other, net	'	'	'	'
Basis of Presentation [Line Items]	'	'	'	'
Loss on disposal of mineral properties	'	1,400	'	1,400
Loss on equipment held for sale	'	300	'	0
Loss (gain) on dispositions or sales of mineral properties, net	'	'	'	'
Basis of Presentation [Line Items]	'	'	'	'
Loss on disposal of mineral properties	'	-1,400	'	-1,400
Loss on assets classified as held for sale and asset dispositions, net	'	'	'	'
Basis of Presentation [Line Items]	'	'	'	'
Loss on equipment held for sale	'	$0	'	$0

Components_of_Inventories_and_

Components of Inventories and Estimated Recoverable Gold Ounces (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
	ozt	ozt
Inventory Disclosure [Abstract]	'	'
Materials and supplies	$16,349,000	$18,002,000
Merrill-Crowe in-process	4,794,000	6,322,000
Carbon column in-process	867,000	859,000
Doré finished goods	1,716,000	1,227,000
Inventories	23,726,000	26,410,000
Merrill-Crowe in-process (in ounces)	3,490	5,662
Carbon column in-process (in ounces)	655	724
Doré finished good (in ounces)	1,258	1,106
Inventory net, (in ounces)	5,403	7,492
Inventories	'	'
Inventory [Line Items]	'	'
Capitalized non-cash depreciation and amortization costs	$1,700,000	$1,600,000

Summary_of_Stockpiles_and_Ore_

Summary of Stockpiles and Ore on Leach Pads and Estimated Recoverable Gold Ounces (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
	ozt		ozt		ozt
Stockpiles and Ore On Leach Pads [Abstract]	'	'	'	'	'
Ore on leach pads, current	$188,263,000	'	$188,263,000	'	$206,504,000
Ore on leach pads, non-current	80,684,000	'	80,684,000	'	88,501,000
Stockpiles, non-current	41,040,000	'	41,040,000	'	27,691,000
Stockpiles and Ore on leach pads, non-current	121,724,000	'	121,724,000	'	116,192,000
Ore on leach pads, current, ounces	163,962	'	163,962	'	180,919
Ore on leach pads, non-current, ounces	70,269	'	70,269	'	77,537
Stockpiles, non-current, ounces	79,014	'	79,014	'	61,771
Stockpiles and Ore on leach pads, non-current, ounces	149,283	'	149,283	'	139,308
Stockpiles and Ore On Leach Pads [Line Items]	'	'	'	'	'
Inventory write-down	70,690,000	0	70,690,000	0	'
Inventory write-down allocated depreciation and amortization costs	16,005,000	0	16,005,000	0	'
Inventory write-down previously incurred cash production costs	54,700,000	'	54,700,000	'	'
London Bullion Market Association (LBMA) gold price	1,216.50	'	1,216.50	'	'
London Bullion Market Association (LBMA) silver price	17.11	'	17.11	'	'
Ore on Leach Pads	'	'	'	'	'
Stockpiles and Ore On Leach Pads [Line Items]	'	'	'	'	'
Capitalized non-cash depreciation and amortization costs	60,900,000	'	60,900,000	'	65,600,000
Stockpiles	'	'	'	'	'
Stockpiles and Ore On Leach Pads [Line Items]	'	'	'	'	'
Capitalized non-cash depreciation and amortization costs	$7,300,000	'	$7,300,000	'	$4,800,000

Components_of_Prepaid_and_Othe

Components of Prepaid and Other Assets (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Prepaids and other	'	'
Prepaids	$4,734	$6,083
Deposits	1,224	1,685
Federal income taxes receivable	605	2,914
Other	89	175
Prepaids and other	6,652	10,857
Other assets, non-current	'	'
Debt issuance costs, net	11,048	12,208
Reclamation policy premium, net	385	474
Cash collateral for cross currency swap - Note 10	480	0
Other assets, non-current	$11,913	$12,682

Restricted_Cash_Details

Restricted Cash (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Restricted Cash and Cash Equivalents Items [Line Items]	'	'
Restricted cash	$48,140	$41,215
Asset retirement obligation surety bonds	'	'
Restricted Cash and Cash Equivalents Items [Line Items]	'	'
Restricted cash	38,140	41,215
Revolving credit agreement - Note 10	'	'
Restricted Cash and Cash Equivalents Items [Line Items]	'	'
Restricted cash	$10,000	$0

Components_of_Plant_Equipment_

Components of Plant, Equipment and Mine Development (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]	'	'
Plant and equipment, gross	1,053,768	1,025,454
Construction in progress and other	240,342	421,117
Less: accumulated depreciation and amortization	-189,023	-135,183
Plant and equipment, net	864,745	890,271
Mine equipment	'	'
Property, Plant and Equipment [Line Items]	'	'
Plant and equipment, gross	298,026	312,425
Mine equipment | Minimum	'	'
Property, Plant and Equipment [Line Items]	'	'
Depreciable life (years)	'5 years	'5 years
Mine equipment | Maximum	'	'
Property, Plant and Equipment [Line Items]	'	'
Depreciable life (years)	'7 years	'7 years
Process equipment	'	'
Property, Plant and Equipment [Line Items]	'	'
Depreciable method	'Units-of-production	'Units-of-production
Plant and equipment, gross	274,757	60,875
Mine development	'	'
Property, Plant and Equipment [Line Items]	'	'
Depreciable method	'Units-of-production	'Units-of-production
Plant and equipment, gross	126,197	120,038
Leach pads	'	'
Property, Plant and Equipment [Line Items]	'	'
Depreciable method	'Units-of-production	'Units-of-production
Plant and equipment, gross	81,446	78,737
Buildings and leasehold improvements	'	'
Property, Plant and Equipment [Line Items]	'	'
Depreciable life (years)	'10 years	'10 years
Plant and equipment, gross	25,640	25,083
Furniture, fixtures, and office equipment	'	'
Property, Plant and Equipment [Line Items]	'	'
Plant and equipment, gross	4,417	4,236
Furniture, fixtures, and office equipment | Minimum	'	'
Property, Plant and Equipment [Line Items]	'	'
Depreciable life (years)	'2 years	'2 years
Furniture, fixtures, and office equipment | Maximum	'	'
Property, Plant and Equipment [Line Items]	'	'
Depreciable life (years)	'3 years	'3 years
Vehicles	'	'
Property, Plant and Equipment [Line Items]	'	'
Plant and equipment, gross	2,943	2,943
Vehicles | Minimum	'	'
Property, Plant and Equipment [Line Items]	'	'
Depreciable life (years)	'3 years	'3 years
Vehicles | Maximum	'	'
Property, Plant and Equipment [Line Items]	'	'
Depreciable life (years)	'5 years	'5 years

Mineral_Properties_Net_Details

Mineral Properties, Net (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended
	Apr. 22, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Mineral Properties [Line Items]	'	'	'	'	'
Gain (loss) on dispositions or sales of mineral properties	'	($2,679,000)	($1,441,000)	$16,801,000	($1,441,000)
Percentage of interest on mineral properties for Sale	75.00%	'	'	'	'
Proceeds from sale of the Properties	20,000,000	'	'	'	'
Mineral properties sold	'	500,000	'	500,000	'
Early-stage exploration properties	'	'	'	'	'
Mineral Properties [Line Items]	'	'	'	'	'
Gain (loss) on dispositions or sales of mineral properties	'	-2,679,000	-1,441,000	-2,679,000	-1,441,000
Exploration properties	'	'	'	'	'
Mineral Properties [Line Items]	'	'	'	'	'
Gain (loss) on dispositions or sales of mineral properties	'	'	'	$19,480,000	'

Components_of_Other_Liabilitie

Components of Other Liabilities, Current and Non-current (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other liabilities, current	'	'
Accrued compensation	$5,333	$3,587
Derivative instruments - Note 18	1,685	669
Capital expenditure retentions	0	4,256
Other	141	0
Other liabilities, current	7,159	8,512
Other liabilities, non-current	'	'
Derivative instruments - Note 18	35,296	21,730
Accounts payable	5,188	0
Deferred royalty income	958	953
Other	56	52
Other liabilities, non-current	$41,498	$22,735

Summary_of_Components_of_Debt_

Summary of Components of Debt (Detail) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Debt, current:	'		'
Capital lease and term loan obligations	$53,366	[1]	$58,435	[1]
Term and Security Deposit loan	17,791	[2]	17,791	[2]
Debt, current	71,157		76,226
Debt, non-current:	'		'
Capital lease and term loan obligations	110,284		146,347
Revolving Credit Agreement	5,000		0
8.75% Senior Notes due June 2019	356,881	[3]	376,080	[3]
Debt, non-current	$472,165		$522,427
[1]	Includes borrowings of $8.9 million and $5.7 million as of September 30, 2014 and December 31, 2013, respectively, for mine equipment included in Assets held for sale.
[2]	Entire borrowing is attributable to the third rope shovel which is included in Assets held for sale.
[3]	Effective interest rate of 8.375% after cross currency swap. See Note 18 - Derivative Instruments for additional detail.

Summary_of_Components_of_Debt_1

Summary of Components of Debt (Parenthetical) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	31-May-12
In Millions, unless otherwise specified
Debt Disclosure [Abstract]	'	'	'	'
Senior Notes, stated interest rate	8.75%	8.75%	8.75%	8.75%
Borrowings for Assets held-for-sale	$8.90	$5.70	'	'
Senior Notes, effective interest rate	8.38%	'	'	'

Debt_Additional_Information_De

Debt - Additional Information (Detail)

1 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

Dec. 31, 2013

Sep. 30, 2014

Jun. 30, 2013

31-May-12

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Mar. 31, 2013

Mar. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

31-May-14

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

31-May-12

USD ($)

USD ($)

CAD

Security Deposit

Loan Agreement

Loan Agreement

Loan Agreement

Loan Agreement

Minimum

Maximum

Third Amended and Restated Credit Agreement

Third Amended and Restated Credit Agreement

Letter of Credit

Second Amended and Restated Credit Agreement

Non-financial Letters of Credit

London Interbank Offered Rate (LIBOR)

Base Rate

Cross currency swap

Cross currency swap

Lender

Obligation

shovel

Security Deposit

Capital lease obligation

ozt

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

shovel

shovel

USD ($)

USD ($)

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Senior Notes face value

'

'

'

400,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Senior Notes, stated interest rate

8.75%

8.75%

8.75%

8.75%

'

'

'

'

'

'

'

'

'

4.50%

'

2.70%

'

'

'

'

Debt instrument, number of lenders

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notional value of cross currency swap

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

400,400,000

Senior Notes, interest rate after cross currency and interest rate swap

'

'

'

8.38%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8.38%

Senior Notes

376,080,000

[1]

356,881,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Capital lease obligations are for the purchase of mining equipment, bear interest at rates

'

'

'

'

'

'

'

'

'

4.00%

7.00%

'

'

'

'

'

'

'

'

'

Capital lease obligations, terms

'

'

'

'

'

'

'

'

'

'60 months

'84 months

'

'

'

'

'

'

'

'

'

Loan Agreement, number of electric rope shovels to be purchased

'

'

'

'

'

'

3

'

'

'

'

'

'

'

'

'

'

'

'

'

Loan Agreement, available amount

'

'

'

'

'

'

'

60,000,000

90,000,000

'

'

'

'

'

'

'

'

'

'

'

Loan agreement available amount per shovel

'

'

'

'

'

'

'

20,000,000

30,000,000

'

'

'

'

'

'

'

'

'

'

'

Number of electric rope shovels for which amounts borrowed included in capital lease

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of electric rope shovels previously commissioned

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loan Agreement, Interest rate on security deposit

'

'

'

'

4.70%

6.00%

'

'

'

'

'

'

'

'

'

'

4.50%

3.50%

'

'

Number of Executed Term Loan Obligations

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loan Agreement, capital lease payment terms

'

'7 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revolving credit agreement, borrowing capacity

'

'

'

'

'

'

'

'

'

'

'

'

75,000,000

'

40,000,000

'

'

'

'

'

Benchmark percentage of net realizable value in Credit Agreement

'

'

'

'

'

'

'

'

'

'

'

'

80.00%

'

'

'

'

'

'

'

Revolver current borrowing capacity

'

'

'

'

'

'

'

'

'

'

'

75,000,000

'

'

'

'

'

'

'

'

Financial letters of credit collateral amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

11,400,000

'

Revolving credit agreement, amount outstanding

0

5,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revolving remaining borrowing capacity

'

'

'

'

'

'

'

'

'

'

'

58,600,000

'

'

'

'

'

'

'

'

Cash collateral as percentage of mark-to-market liability position

'

22.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash collateral for cross currency swap

0

480,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt covenant of tangible net worth

'

437,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt covenant, percentage of positive net income for Each Quarter

'

25.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt covenant of current ratio

'

'

'

'

'

'

'

'

'

1.25

'

'

'

'

'

'

'

'

'

'

Debt covenant of cash and cash equivalents in deposit accounts

'

$10,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt covenant of gold equivalent recoverable ounces (more than 600,000)

'

'

'

'

'

'

'

'

'

600,000

'

'

'

'

'

'

'

'

'

'

[1]

Effective interest rate of 8.375% after cross currency swap. See Note 18 - Derivative Instruments for additional detail.

Future_Minimum_Capital_Lease_O

Future Minimum Capital Lease Obligation Payments, Including Interest (Detail) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'		'
2014	$22,499	[1]	'
2015	49,898		'
2016	47,392		'
2017	32,941		'
2018	11,885		'
Thereafter	15,421		'
Less: interest	-16,386		'
Net minimum capital lease payments	163,650		'
Less: current portion	-53,366	[2]	-58,435	[2]
Non-current portion	$110,284		$146,347
[1]	Includes principal of $8.9 million for mine equipment included in Assets held for sale.
[2]	Includes borrowings of $8.9 million and $5.7 million as of September 30, 2014 and December 31, 2013, respectively, for mine equipment included in Assets held for sale.

Summary_of_Components_of_Inter

Summary of Components of Interest Expense (Detail) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Interest Expense [Line Items]	'		'		'		'
Capital lease and term loan obligations	$2,124		$1,989		$5,943		$5,441
Amortization of debt issuance costs	740		664		2,047		1,909
Revolver interest and standby fees	341		385		858		1,010
Term and Security Deposit loan	226		755		671		1,105
Other interest expense	141		368		424		592
Capitalized interest	-666		-7,252		-6,550		-21,593
Interest expense	11,358		5,361		28,474		13,683
8.75% Senior Notes due June 2019	'		'		'		'
Interest Expense [Line Items]	'		'		'		'
Interest expense	$8,452	[1]	$8,452	[1]	$25,081	[1]	$25,219	[1]
[1]	Effective interest rate of 8.375% after cross currency swap. See Note 18 - Derivative Instruments for additional detail.

Summary_of_Components_of_Inter1

Summary of Components of Interest Expense (Parenthetical) (Detail)	Sep. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	31-May-12
Debt Disclosure [Abstract]	'	'	'	'
Senior Notes, stated interest rate	8.75%	8.75%	8.75%	8.75%
Senior Notes, interest rate after cross currency and interest rate swap	'	'	'	8.38%

Summary_of_Revenue_from_Gold_a

Summary of Revenue from Gold and Silver Revenue (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
	ozt	ozt	ozt	ozt
Segment Reporting [Abstract]	'	'	'	'
Gold Amount	$66,511	$72,649	$217,458	$172,567
Silver Amount	10,401	4,092	28,102	12,362
Total	$76,912	$76,741	$245,560	$184,929
Gold Ounces Sold	52,176	52,713	168,696	121,481
Silver Ounces Sold	535,407	184,082	1,416,473	505,151

Separation_and_Severance_Costs2

Separation and Severance Costs (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Separation and severance costs	$0	$3,011	$0	$5,933
One time, cash payments	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Separation and severance costs	0	3,011	0	4,809
Stock-based compensation costs from continued vesting	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Separation and severance costs	0	0	0	1,124
Hycroft Mine	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Separation and severance costs	0	1,860	0	1,860
Exploration	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Separation and severance costs	0	381	0	405
Corporate and Other	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Separation and severance costs	$0	$770	$0	$3,668

Other_Net_Details

Other, Net (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Other, Net [Abstract]	'	'	'	'
Foreign currency transaction gain (loss) on Notes - Note 18	$17,800	($8,400)	$19,200	$13,120
Reclassification of (loss) gain into earnings from Accumulated other comprehensive income for cross currency swap - Note 18	-17,800	8,400	-19,200	-13,120
Gain (loss) on marketable equity securities	0	290	0	-677
Other	18	53	-20	119
Other, net	$18	$343	($20)	($558)

Income_Tax_Benefit_Additional_

Income Tax Benefit - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'	'	'	'
Income tax benefit	$23,838,000	$4,083,000	$20,459,000	$1,776,000
Income tax benefit from income taxed at the estimated annual effective rate	23,700,000	'	'	'
Effective tax rate	30.30%	'	'	10.00%
income tax expense for discrete items related to stock-based compensation	$3,200,000	'	'	'
United States statutory tax rate	'	'	35.00%	35.00%

Computation_of_Basic_and_Dilut

Computation of Basic and Diluted Income Per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Net (loss) income available to common stockholders:	($62,414)	$4,971	($57,706)	$18,019
Weighted average common shares:	'	'	'	'
Basic, in shares	104,852,000	104,416,000	104,728,000	97,297,000
Effect of shares granted under the:	'	'	'	'
Restricted Share Unit Plan, in shares	0	1,045,000	0	988,000
Deferred Phantom Unit Plan, in shares	0	248,000	0	248,000
Deferred Share Unit Plan, in shares	0	130,000	0	97,000
2007 Stock Option Plan, in shares	0	83,000	0	319,000
Diluted, in shares	104,852,000	105,922,000	104,728,000	98,949,000
(Loss) income per share:	'	'	'	'
Basic, in dollars per share	($0.60)	$0.05	($0.55)	$0.19
Diluted, in dollars per share	($0.60)	$0.05	($0.55)	$0.18
Restricted share units	'	'	'	'
(Loss) income per share:	'	'	'	'
Antidilutive securities excluded from computation of earnings per share, amount	1,833,828	'	1,833,828	'
Deferred share units	'	'	'	'
(Loss) income per share:	'	'	'	'
Antidilutive securities excluded from computation of earnings per share, amount	380,560	'	380,560	'
Deferred phantom units	'	'	'	'
(Loss) income per share:	'	'	'	'
Antidilutive securities excluded from computation of earnings per share, amount	248,136	'	248,136	'

StockBased_Compensation_Cost_b

Stock-Based Compensation Cost by Plan (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock-based compensation	$1,628	$1,217	$4,872	$5,305
Restricted Share Unit Plan	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock-based compensation	1,289	1,005	4,006	4,568
Performance and Incentive Pay Plan	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock-based compensation	139	0	204	0
Deferred Share Unit Plan	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock-based compensation	$200	$212	$662	$737

Unrecognized_StockBased_Compen

Unrecognized Stock-Based Compensation Cost by Plan (Detail) (USD $)	Sep. 30, 2014	Jun. 30, 2013
In Thousands, unless otherwise specified
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Unrecognized stock-based compensation cost	$9,429	$12,640
Performance and Incentive Pay Plan	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Unrecognized stock-based compensation cost	818	0
Restricted Share Unit Plan	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Unrecognized stock-based compensation cost	8,211	12,115
Deferred Share Unit Plan	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Unrecognized stock-based compensation cost	$400	$525

Activity_of_StockBased_Compens

Activity of Stock-Based Compensation Plans (Detail)	9 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	1-May-14	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Dec. 31, 2013
	Restricted Share Unit Plan	Performance and Incentive Pay Plan	Performance and Incentive Pay Plan	Deferred Share Unit Plan	2007 Stock Option Plan	2007 Stock Option Plan	Deferred Phantom Unit Plan	Deferred Phantom Unit Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	'	'	4,000,000	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'	'	'	'	'	'	'	'
Outstanding, beginning of period	'	'	'	'	500,000	500,000	'	'
Outstanding, end of period	'	'	'	'	500,000	500,000	'	'
Vested and unissued/exercisable, end of period	'	'	'	'	500,000	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]	'	'	'	'	'	'	'	'
Outstanding, beginning of period	1,630,145	0	'	134,408	'	'	248,136	248,136
Granted	1,003,800	378,790	'	246,152	'	'	'	'
Issued/exercised	-382,667	-12,500	'	'	'	'	'	'
Canceled/forfeited	-225,205	-63,419	'	'	'	'	'	'
Outstanding, end of period	2,026,073	302,871	'	380,560	'	'	248,136	248,136
Vested and unissued/exercisable, end of period	495,116	'	'	257,484	'	'	248,136	'

Financial_Instruments_Measured

Financial Instruments Measured at Fair Value on Recurring Basis (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Assets held for sale	$45,564	$47,357
Fair Value, Inputs, Level 2	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Assets held for sale	45,564	47,357
Cross currency swap - Note 18	36,981	22,399
Fair Value, Inputs, Level 2 | Cross currency swap	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cross currency swap - Note 18	36,800	22,399
Fair Value, Inputs, Level 2 | Diesel swap agreements	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cross currency swap - Note 18	$181	$0

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	Sep. 30, 2014
In Millions, unless otherwise specified
Fair Value Disclosures [Abstract]	'
Senior note, estimated fair value	$333.70

Derivative_Instruments_Designa

Derivative Instruments Designated as Cash Flow Hedges (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]	'	'
Other liabilities, current	$1,685	$669
Other liabilities, non-current	35,296	21,730
Other liabilities, current	'	'
Derivatives, Fair Value [Line Items]	'	'
Other liabilities, current	1,685	669
Other liabilities, current | Cross currency swap	'	'
Derivatives, Fair Value [Line Items]	'	'
Other liabilities, current	1,544	669
Other liabilities, current | Diesel swap agreements	'	'
Derivatives, Fair Value [Line Items]	'	'
Other liabilities, current	141	0
Other liabilities, non-current	'	'
Derivatives, Fair Value [Line Items]	'	'
Other liabilities, non-current	35,296	21,730
Other liabilities, non-current | Cross currency swap	'	'
Derivatives, Fair Value [Line Items]	'	'
Other liabilities, non-current	35,256	21,730
Other liabilities, non-current | Diesel swap agreements	'	'
Derivatives, Fair Value [Line Items]	'	'
Other liabilities, non-current	$40	$0

Derivative_Instruments_Additio

Derivative Instruments - Additional Information (Detail)	Sep. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	31-May-12	Sep. 30, 2014	31-May-12	31-May-12	31-May-12
				CAD	Diesel swap agreements	Cross currency swap	Cross currency swap	Cross currency swap
					gal	USD ($)	CAD	8.375% Senior Subordinated Notes
								USD ($)
Derivative Instrument [Line Items]	'	'	'	'	'	'	'	'
Derivative, nonmonetary notional amount, volume	'	'	'	'	3,000,000	'	'	'
Derivative, nonmonetary notional amount, volume per month	'	'	'	'	250,000	'	'	'
Underlying, derivative volume	'	'	'	'	2.7	'	'	'
Derivative, commodity underlying volume as percentage of next fiscal year forecasted consumption	'	'	'	'	28.00%	'	'	'
Notional value of cross currency swap	'	'	'	'	'	$400,400,000	'	$400,400,000
Senior Notes, interest rate after cross currency and interest rate swap	'	'	'	8.38%	'	8.38%	8.38%	'
Senior Notes face value	'	'	'	400,000,000	'	'	'	'
Senior Notes, stated interest rate	8.75%	8.75%	8.75%	8.75%	'	'	'	'
Payment to counterparty upon maturity of derivative	'	'	'	'	'	400,400,000	'	'
Proceed from counterparty upon maturity of derivative	'	'	'	'	'	'	400,000,000	'
Cash collateral as percentage of mark-to-market liability position	22.00%	'	'	'	'	'	'	'

Changes_in_Accumulated_Other_C

Changes in Accumulated Other Comprehensive Income (Loss) and Effect of Cash Flow Hedges (Detail) (USD $)

Sep. 30, 2014

Dec. 31, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

In Thousands, unless otherwise specified

Change in fair value of effective portion of unsettled cash flow hedge instruments

Change in fair value of effective portion of unsettled cash flow hedge instruments

Change in fair value of effective portion of unsettled cash flow hedge instruments

Change in fair value of effective portion of unsettled cash flow hedge instruments

Settlements of cash flow hedges

Settlements of cash flow hedges

Settlements of cash flow hedges

Settlements of cash flow hedges

Reclassifications into earnings when underlying hedged transactions impacted earnings

Reclassifications into earnings when underlying hedged transactions impacted earnings

Cross currency swap

Cross currency swap

Cross currency swap

Cross currency swap

Cross currency swap

Cross currency swap

Cross currency swap

Cross currency swap

Cross currency swap

Cross currency swap

Diesel swap agreements

Diesel swap agreements

Diesel swap agreements

Diesel swap agreements

Diesel swap agreements

Diesel swap agreements

Diesel swap agreements

Diesel swap agreements

Diesel swap agreements

Diesel swap agreements

Tax Effects

Tax Effects

Tax Effects

Tax Effects

Tax Effects

Tax Effects

Tax Effects

Tax Effects

Tax Effects

Tax Effects

Change in fair value of effective portion of unsettled cash flow hedge instruments

Change in fair value of effective portion of unsettled cash flow hedge instruments

Settlements of cash flow hedges

Settlements of cash flow hedges

Reclassifications into earnings when underlying hedged transactions impacted earnings

Reclassifications into earnings when underlying hedged transactions impacted earnings

Change in fair value of effective portion of unsettled cash flow hedge instruments

Change in fair value of effective portion of unsettled cash flow hedge instruments

Settlements of cash flow hedges

Settlements of cash flow hedges

Reclassifications into earnings when underlying hedged transactions impacted earnings

Reclassifications into earnings when underlying hedged transactions impacted earnings

Change in fair value of effective portion of unsettled cash flow hedge instruments

Change in fair value of effective portion of unsettled cash flow hedge instruments

Settlements of cash flow hedges

Settlements of cash flow hedges

Reclassifications into earnings when underlying hedged transactions impacted earnings

Reclassifications into earnings when underlying hedged transactions impacted earnings

Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance, beginning of period

$4,367

$1,674

($1,924)

($5,416)

'

'

'

'

'

'

'

'

'

'

$6,719

$1,920

($3,793)

($9,574)

'

'

'

'

'

'

($3)

$653

$832

$1,241

'

'

'

'

'

'

($2,349)

($899)

$1,037

$2,917

'

'

'

'

'

'

Cash flow hedge instruments

'

'

'

'

2,157

2,470

3,002

3,596

-12,001

5,941

-13,346

-8,055

'

'

'

'

'

'

4,799

5,781

-20,532

-12,927

'

'

'

'

'

'

-180

-248

0

534

'

'

'

'

'

'

-1,617

-1,937

7,186

4,338

'

'

Reclassifications into earnings when underlying hedged transactions impacted earnings:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reclassified to Interest expense

'

'

'

'

'

'

'

'

'

'

'

'

866

-125

'

'

'

'

'

'

'

'

1,332

-193

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

-466

68

Reclassified to Other, net

'

'

'

'

'

'

'

'

'

'

'

'

12,480

8,528

'

'

'

'

'

'

'

'

19,200

13,120

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

-6,720

-4,592

Reclassified to Production costs

'

'

'

'

'

'

'

'

'

'

'

'

-309

-452

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

-476

-695

'

'

'

'

'

'

'

'

167

243

Balance, end of period

$4,367

$1,674

($1,924)

($5,416)

'

'

'

'

'

'

'

'

'

'

$6,719

$1,920

($3,793)

($9,574)

'

'

'

'

'

'

($3)

$653

$832

$1,241

'

'

'

'

'

'

($2,349)

($899)

$1,037

$2,917

'

'

'

'

'

'

Segment_Information_Detail

Segment Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]	'	'	'	'	'
Revenue - Note 11	$76,912	$76,741	$245,560	$184,929	'
Depreciation and amortization	16,308	9,607	47,573	19,194	'
Write-down of production inventories - Note 4	70,690	0	70,690	0	'
Loss from operations	-74,915	5,829	-49,689	30,169	'
Interest income	3	77	18	315	'
Interest expense - Note 10	-11,358	-5,361	-28,474	-13,683	'
Other, net - Note 13	18	343	-20	-558	'
(Loss) income before income taxes	-86,252	888	-78,165	16,243	'
Total assets	1,394,519	1,530,667	1,394,519	1,530,667	1,512,601
Capital expenditures	6,304	89,989	73,918	398,985	'
Hycroft Mine	'	'	'	'	'
Segment Reporting, Revenue Reconciling Item [Line Items]	'	'	'	'	'
Revenue - Note 11	76,912	76,741	245,560	184,929	'
Depreciation and amortization	16,063	9,346	46,818	18,406	'
Write-down of production inventories - Note 4	70,690	'	70,690	'	'
Loss from operations	-66,082	13,299	-46,438	55,059	'
Interest income	1	2	6	10	'
Interest expense - Note 10	-2,491	-2,912	-7,037	-6,937	'
Other, net - Note 13	-42	49	-6	115	'
(Loss) income before income taxes	-68,614	10,438	-53,475	48,247	'
Total assets	1,302,629	1,348,593	1,302,629	1,348,593	'
Capital expenditures	6,304	89,938	73,918	398,785	'
Exploration	'	'	'	'	'
Segment Reporting, Revenue Reconciling Item [Line Items]	'	'	'	'	'
Revenue - Note 11	0	0	0	0	'
Depreciation and amortization	0	0	0	0	'
Write-down of production inventories - Note 4	0	'	0	'	'
Loss from operations	-3,298	-2,762	14,788	-4,952	'
Interest income	0	0	0	0	'
Interest expense - Note 10	0	0	0	0	'
Other, net - Note 13	60	0	60	0	'
(Loss) income before income taxes	-3,238	-2,762	14,848	-4,952	'
Total assets	35,517	38,743	35,517	38,743	'
Capital expenditures	0	51	0	51	'
Corporate and Other	'	'	'	'	'
Segment Reporting, Revenue Reconciling Item [Line Items]	'	'	'	'	'
Revenue - Note 11	0	0	0	0	'
Depreciation and amortization	245	261	755	788	'
Write-down of production inventories - Note 4	0	'	0	'	'
Loss from operations	-5,535	-4,708	-18,039	-19,938	'
Interest income	2	75	12	305	'
Interest expense - Note 10	-8,867	-2,449	-21,437	-6,746	'
Other, net - Note 13	0	294	-74	-673	'
(Loss) income before income taxes	-14,400	-6,788	-39,538	-27,052	'
Total assets	56,373	143,331	56,373	143,331	'
Capital expenditures	$0	$0	$0	$149	'

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Line Items]	'
Temporary housing space rental and service agreement, payments due in 2014	$400,000
Temporary housing space rental and service agreement, payments due in 2015	3,600,000
Temporary housing space rental and service agreement, payments due in 2016	100,000
Net profit royalty payable percentage	4.00%
Payments for where mining occurs on the leased claims	120,000
Lease obligation to be paid in the future	7,600,000
Royalty payments	2,100,000
Mining lease, payment due in 2015	300,000
Mining lease, payment due in 2016	1,500,000
Mining lease, payment due in 2017	3,000,000
Mining lease, payment due in 2018	700,000
Capital Addition Purchase Commitments	'
Commitments and Contingencies Disclosure [Line Items]	'
Purchase commitment, amount	12,300,000
Cross currency swap	'
Commitments and Contingencies Disclosure [Line Items]	'
Financial letters of credit collateral amount	$11,400,000