Golden Minerals (AUMN) 10-Q 2 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 01, 2018
Document and Entity Information
Entity Registrant Name	Golden Minerals Co
Entity Central Index Key	1,011,509
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		91,929,709
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 2,711	$ 3,250
Short-term investments	233	238
Lease receivables	402	314
Inventories, net	259	242
Value added tax receivable, net	13	148
Prepaid expenses and other assets	850	745
Total current assets	4,468	4,937
Property, plant and equipment, net	7,866	8,140
Total assets	12,334	13,077
Current liabilities
Accounts payable and other accrued liabilities	1,400	1,556
Deferred revenue, current	293	293
Other current liabilities	193	9
Total current liabilities	1,886	1,858
Asset retirement and reclamation liabilities	2,544	2,495
Deferred revenue, non-current	528	600
Other long term liabilities	35	43
Total liabilities	4,993	4,996
Commitments and contingencies
Equity
Common stock, $.01 par value, 200,000,000 shares authorized; 91,929,709 shares issued and outstanding at both periods	919	919
Additional paid in capital	516,329	516,284
Accumulated deficit	(509,907)	(509,082)
Accumulated other comprehensive loss		(40)
Shareholders' equity	7,341	8,081
Total liabilities and equity	$ 12,334	$ 13,077

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
CONDENSED CONSOLIDATED BALANCE SHEETS
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	91,929,709	91,929,709
Common stock, shares outstanding	91,929,709	91,929,709

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Revenue:
Oxide plant lease		$ 1,637	$ 1,644
Total revenue		1,637	1,644
Costs and expenses:
Oxide plant lease costs		(503)	(537)
Exploration expense		(899)	(534)
El Quevar project expense		(272)	(149)
Velardena shutdown and care and maintenance costs		(489)	(350)
Administrative expense		(1,061)	(1,026)
Stock based compensation		(15)	(65)
Reclamation expense		(51)	(49)
Other operating income, net		1,226	157
Depreciation and amortization		(296)	(188)
Total costs and expenses		(2,360)	(2,741)
Loss from operations		(723)	(1,097)
Other income and (expense):
Interest and other income, net		3	18
(Loss) gain on foreign currency		(15)	6
Loss from operations before income taxes		(735)	(1,073)
Net loss		(735)	(1,073)
Comprehensive loss, net of tax:
Unrealized loss on securities			(52)
Comprehensive loss		$ (735)	$ (1,125)
Net loss per common share — basic
Loss (in dollars per share)		$ (0.01)	$ (0.01)
Weighted average common stock outstanding - basic (in shares)	[1]	91,726,375	89,350,286
[1]	Potentially dilutive shares have not been included because to do so would be anti-dilutive.

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net cash used in operating activities	$ (1,760)	$ (1,087)
Cash flows from investing activities:
Proceeds from sale of assets	1,249	115
Acquisitions of property, plant and equipment	(28)
Net cash from investing activities	1,221	115
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs		449
Net cash from financing activities		449
Net decrease in cash and cash equivalents	(539)	(523)
Cash and cash equivalents, beginning of period	3,250	2,588
Cash and cash equivalents, end of period	$ 2,711	$ 2,065

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive income (loss)	Total
Increase (Decrease) in Stockholders' Equity
Cumulative adjustment related to change in accounting principle | Cumulative Effect Adjustment | ASU 2017-11 Earnings Per Share		$ 19,046	$ (17,148)		$ 1,898
Adjusted balance at beginning of period	$ 889	514,501	(505,185)	$ 55	10,260
Balance (Previously Reported) at Dec. 31, 2016	$ 889	495,455	(488,037)	55	8,362
Balance (in shares) (Previously Reported) at Dec. 31, 2016	89,020,041
Balance (in shares) at Dec. 31, 2016	89,020,041
Increase (Decrease) in Stockholders' Equity
Stock compensation accrued and shares issued for vested stock awards	$ 1	196			197
Stock compensation accrued and shares issued for vested stock awards (in shares)	200,000
Shares issued under the at-the-market offering agreement, net	$ 10	671			681
Shares issued under the at-the-market offering agreement, net (in shares)	1,024,392
Consideration shares sold to Hecla, net	$ 18	912			930
Consideration shares sold to Hecla, net (in shares)	1,811,015
Cancellation of treasury shares	$ 1	(1)
Cancellation of treasury shares (in shares)	(125,739)
Deemed dividend on warrants		5	(5)
Unrealized loss on marketable equity securities, net of tax				(95)	(95)
Net loss			(3,892)		(3,892)
Balance (Previously Reported) at Dec. 31, 2017	$ 919	516,284	(509,082)	(40)	8,081
Balance at Dec. 31, 2017					8,081
Balance (in shares) (Previously Reported) at Dec. 31, 2017	91,929,709
Balance (in shares) at Dec. 31, 2017	91,929,709
Increase (Decrease) in Stockholders' Equity
Cumulative adjustment related to change in accounting principle | Cumulative Effect Adjustment | ASU 2014-09 Revenue from Contracts with Customers			(89)	$ 40	(49)
Adjusted balance at beginning of period	$ 919	516,284	(509,172)		8,031
Stock compensation accrued and shares issued for vested stock awards		45			45
Net loss			(735)		(735)
Balance at Mar. 31, 2018	$ 919	$ 516,329	$ (509,907)		$ 7,341
Balance (in shares) at Mar. 31, 2018	91,929,709

Basis of Preparation of Financi

Basis of Preparation of Financial Statements and Nature of Operations	3 Months Ended
	Mar. 31, 2018
Basis of Preparation of Financial Statements and Nature of Operations
Basis of Preparation of Financial Statements and Nature of Operations	1. Basis of Preparation of Financial Statements and Nature of Operations Golden Minerals Company (the “Company”), a Delaware corporation, has prepared these unaudited interim condensed consolidated financial statements in accordance with accounting principles generally accepted in the United States (“GAAP”) and the rules and regulations of the Securities and Exchange Commission (“SEC”). The interim condensed consolidated financial statements do not include all disclosures required by GAAP for annual financial statements, but in the opinion of management, include all adjustments necessary for a fair presentation. Interim results are not necessarily indicative of results for a full year; accordingly, these interim financial statements should be read in conjunction with the annual financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, and filed with the SEC on March 2, 2018. The Company is a mining company, holding a 100% interest in the Velardeña and Chicago precious metals mining properties and associated oxide and sulfide processing plants in Mexico (the “Velardeña Properties”). During November 2015 the Company suspended mining and sulfide processing activities at its Velardeña Properties in order to conserve the asset until the Company is able to develop mining and processing plans that at then current prices for silver and gold indicate a sustainable positive operating margin (defined as revenues less costs of sales) or the Company is able to locate, acquire and develop alternative mineral sources that could be economically mined and transported to the Velardeña Properties for processing. The Company has placed the mine and sulfide processing plant on care and maintenance to enable a re-start of either the mine or mill when mining and processing plans and metals prices support a cash positive outlook. The Company incurred approximately $0.5 million and $0.4 million in care and maintenance costs for the three months ended March 31, 2018 and March 31, 2017, respectively. On an ongoing basis, the Company expects to incur approximately $0.4 million in quarterly care and maintenance costs while mining and processing remain suspended. The Company has retained a core group of employees at the Velardeña Properties, most of whom have been assigned to operate and provide administrative support for the oxide plant, which is leased to a subsidiary of Hecla Mining Company (“Hecla”) and not affected by the shutdown. The oxide plant began processing material for Hecla in mid-December 2015, and the Company expects to receive net cash flow under the lease of approximately $4.5 million in 2018. However, because Hecla has the right to terminate the lease on sixty days’ notice, there is no assurance that this amount will be received. On March 24, 2017, Hecla exercised its right to extend the lease through December 31, 2018. On August 2, 2017, the Company granted Hecla an option to extend the lease for an additional period of up to two years ending no later than December 31, 2020 in exchange for a $1.0 million cash payment and the purchase of $1.0 million, or approximately 1.8 million shares of the Company’s common stock, issued at par at a price of $0.55 per share, based on an undiscounted 30-day volume weighted average stock price (see Note 14). The retained employees also include an exploration group and an operations and administrative group to continue to advance the Company’s plans in Mexico, oversee corporate compliance activities, and to maintain and safeguard the longer term value of the Velardeña Properties assets. The Company remains focused on evaluating and searching for mining opportunities in North America (including Mexico) with near term prospects of mining, and particularly for properties within reasonable haulage distances of our processing plants at the Velardeña Properties. The Company is also reviewing strategic opportunities, focusing primarily on development or operating properties in North America, including Mexico. The Company is continuing its exploration efforts on selected properties in its portfolio of approximately 10 exploration properties located primarily in Mexico. The Company is considered an exploration stage company under the criteria set forth by the SEC as the Company has not yet demonstrated the existence of proven or probable mineral reserves, as defined by SEC Industry Guide 7, at the Velardeña Properties, or any of the Company’s other properties. As a result, and in accordance with GAAP for exploration stage companies, all expenditures for exploration and evaluation of the Company’s properties are expensed as incurred. As such the Company’s financial statements may not be comparable to the financial statements of mining companies that do have proven and probable mineral reserves. Such companies would typically capitalize certain development costs including infrastructure development and mining activities to access the ore. The capitalized costs would be amortized on a units-of-production basis as reserves are mined. The amortized costs are typically allocated to inventory and eventually to cost of sales as the inventories are sold. As the Company does not have proven and probable reserves, substantially all expenditures at the Company’s Velardeña Properties for mine construction activity, as well as costs associated with the mill facilities, and for items that do not have a readily identifiable market value apart from the mineralized material, have been expensed as incurred. Such costs are charged to cost of metals sold or project expense during the period depending on the nature of the costs. Certain of the costs may be reflected in inventories prior to the sale of the product. The term “mineralized material” as used herein, although permissible under SEC Industry Guide 7, does not indicate “reserves” by SEC standards. The Company cannot be certain that any deposits at the Velardeña Properties or any other exploration property will ever be confirmed or converted into SEC Industry Guide 7 compliant “reserves”.

New Accounting Pronouncements

New Accounting Pronouncements	3 Months Ended
	Mar. 31, 2018
New Accounting Pronouncements
New Accounting Pronouncements	2. New Accounting Pronouncements During the first quarter 2018 the Company adopted ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASU 2014-09”) which was issued by the Financial Accounting Standards Board (“FASB”) in May 2014. The Company also adopted ASU No. 2017-05, “Other Income (Subtopic 310-20)” (“ASU 2017-05”), which was issued by the FASB in February 2017 clarifying the scope of Subtopic 610-20, which was originally issued as part of ASU 2014-09. ASU 2014-09 outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. In addition, the guidance requires improved disclosures to help users of financial statements better understand the nature, amount, timing and uncertainty of revenue that is recognized and the related cash flows. The Company has elected the modified retrospective method of adopting ASU 2014 (see Note 3). During the first quarter 2018 the Company adopted ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities” (“ASU 2016-01”), which amended its accounting treatment for the recognition, measurement, presentation and disclosure of certain financial assets. ASU 2016-01 requires equity investments that have a readily determinable fair value to be measured at fair value through net income. Previously, entities would recognize changes in fair value of available-for-sale equity securities in other comprehensive income, and would recognize in net income impairment losses that were other-than-temporary. There will no longer be an available-for-sale classification (with changes in fair value reported in other comprehensive income) for equity securities with readily determinable fair values. The Company recognized retrospectively the cumulative effect of initially adopting ASU 2016-01 (see Note 3). In July 2017, the FASB issued ASU 2017-11, “ Earnings Per Share (Topic 260); Distinguishing Liabilities from Equity (Topic 480); Derivatives and Hedging (Topic 815): (Part 1) Accounting for Certain Financial Instruments with Down Round Features, (Part II) Replacement of the Indefinite Deferral for Mandatorily Redeemable Financial Instruments of Certain Non public Entities and Certain Mandatorily Redeemable Non-controlling Interests with a Scope Exception” (“ASU 2017-11”). Part I relates to the accounting for certain financial instruments with down round features in Subtopic 815-40, which is considered in determining whether an equity-linked financial instrument qualifies for a scope exception from derivative accounting. Down round features are features of certain equity-linked instruments (or embedded features) that result in the strike price being reduced based on the pricing of future equity offerings. An entity still is required to determine whether instruments would be classified as equity under the guidance in Subtopic 815-40 in determining whether they qualify for that scope exception. If they do qualify, freestanding instruments with down round features are no longer classified as liabilities. For the Company, adoption of ASU 2017-11 was required for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period. Early adoption was permitted, including in an interim period. The Company early adopted ASU 2017-11 during the interim period ended September 30, 2017 (see Note 3). In February 2016, the FASB issued ASU 2016-02, “Leases” (“ASU 2016-02”), which will require lessees to recognize a right-of-use asset and a lease liability for all leases with terms greater than twelve months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. For a lessor, the accounting applied is largely unchanged from previous guidance. The new rules will be effective for the Company in the first quarter of 2019. The Company does not anticipate early adoption. The Company currently leases administrative offices in the U.S. and in several foreign locations under lease agreements that typically exceed one year. Depending on the number of years remaining under such lease agreements the right-of-use assets and lease liabilities that the Company would record under ASU 2016-2 could be material.

Change in Accounting Principle

Change in Accounting Principle	3 Months Ended
	Mar. 31, 2018
Change in Accounting Principle
Change in Accounting Principle	3. Warrant Liability In July 2017, the FASB issued ASU 2017-11, “ Earnings Per Share (Topic 260); Distinguishing Liabilities from Equity (Topic 480); Derivatives and Hedging (Topic 815): (Part 1) Accounting for Certain Financial Instruments with Down Round Features, (Part II) Replacement of the Indefinite Deferral for Mandatorily Redeemable Financial Instruments of Certain Non public Entities and Certain Mandatorily Redeemable Non-controlling Interests with a Scope Exception” (“ASU 2017-11”). Part I relates to the accounting for certain financial instruments with down round features in Subtopic 815-40, which is considered in determining whether an equity-linked financial instrument qualifies for a scope exception from derivative accounting. In the case where the exception from derivative accounting does not apply, warrants must be accounted for as a liability and recorded at fair value at the date of grant and re-valued at the end of each reporting period. The September 2012 and 2014 warrants (see Note 14) include anti-dilution provisions characterized as down round features and were previously accounted for as liabilities, with the fair value of the warrant liabilities remeasured at each reporting date and the change in liabilities recorded as other non-operating income or loss. The Company had recorded a “ Warrant liability ” of $1.9 million and a warrant derivative gain of $17.1 million in its “ Accumulated deficit ” as reported in its Condensed Consolidated Balance Sheets for the year ended December 31, 2016 relating to the September 2012 and 2014 warrants prior to the change in accounting principle. The Company had recorded a warrant liability of $2.0 million as of March 31, 2017 and reported a warrant derivative loss of $0.1 million for the three months ended March 31, 2017 relating to the September 2012 and 2014 warrants prior to the change in accounting principle. In addition, for freestanding equity-classified financial instruments, ASU 2017-11 also requires entities that present earnings per share (EPS) in accordance with Topic 260 to recognize the effect of the down round feature when it is triggered. That effect is treated as a dividend and as a reduction of income available to common shareholders in basic EPS. Certain equity transactions following the issuance of the September 2012 and 2014 warrants have triggered anti-dilution clauses in the warrant agreements resulting in additional warrant shares and a reduction to the original strike price of the warrants. ASU 2017-11 prescribes a method to measure the value of a deemed dividend related to a triggering event by computing the difference in fair value between two instruments that have terms consistent with the actual instrument but that do not have a down round feature, where the number of warrant shares and strike price of one instrument corresponds to the actual instrument before the triggering event and the number of warrant shares and strike price of the other instrument corresponds to the actual instrument immediately after the triggering event. Following ASU 2017-11, for periods ending on or prior to December 31, 2016 the Company would have reduced its “ Accumulated deficit ” as reported on its Condensed Consolidated Balance Sheets by approximately $0.3 million related to prior triggering events. During the three month period ending March 31, 2017 the Company would have reduced its accumulated deficit by approximately $1,000 related to triggering events. There were no triggering events in the three months ended March 31, 2018. Except for the down round features in the September 2012 and 2014 warrants, the warrants would have been classified in equity under the guidance in Subtopic 815-40 and therefore qualify for the scope exception in ASU 2017-11 . As permitted, the Company elected to adopt the accounting principles prescribed by ASU 2017-11 during the interim period ended September 30, 2017 and recorded a cumulative-effect adjustment stemming from a change in accounting principle in its financial statements measured retrospectively to the beginning of 2017. The cumulative effect adjustment appears at the beginning of 2017 in the Company’s Condensed Consolidated Statement of Changes in Equity. The results of operations for the Company for the three months ended March 31, 2017 reflect application of the change in accounting principle from the beginning of 2017. As noted above, the Company had previously reported a warrant derivative gain of $0.1 million during the three month period ending March 31, 2017. Because the Company has retroactively applied the change in accounting principle discussed above to the beginning of 2017, the Company is no longer reporting warrant derivative gains or losses for the September 2012 and 2014 warrants beginning in 2017. Other Income Related to the Sale of Exploration Properties During the first quarter 2018 the Company adopted ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASU 2014-09”) which was issued by the FASB” in May 2014. ASU 2014-09 outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. In addition, the guidance requires improved disclosures to help users of financial statements better understand the nature, amount, timing and uncertainty of revenue that is recognized and the related cash flows. The Company has elected the modified retrospective method of initially adopting ASU 2014-09. ASU 2014-09 requires, in certain instances, that transactions covered by ASC Topic 610, “Other Income” (“Topic 610”) follow the recognition, measurement and disclosure guidelines established by ASU 2014-09. The Company generally follows the guidance of Topic 610 with respect to the recognition of income from the farm-out or sale of exploration properties. As of the beginning of 2018, the Company had one open contract impacted by the adoption of ASU 2014-09, involving an option agreement under which Santacruz Silver Mining Ltd. (“Santacruz”) may acquire the Company’s interest in certain nonstrategic mineral claims located in the Zacatecas Mining District, Zacatecas, Mexico (the “Zacatecas Properties”) for a series of payments totaling $1.5 million (Note 8). In applying ASU 2014-09, approximately $49,000 of the income recognized from the Santacruz transaction in the fourth quarter of 2017 would have been recognized in the first quarter of 2018. Accordingly, the Company has recognized retrospectively the cumulative effect of initially adopting ASU 2014-09 by recording a negative adjustment to retained earnings of $49,000 at the beginning of 2018, included in the Company’s Condensed Consolidated Statement of Changes in Equity, and recording $49,000 in “ Other operating income, net ” in the accompanying Condensed Consolidated Statements of Operations and Comprehensive Loss for the period ended March 31, 2018. See Note 8 for a further description of the contract with Santacruz and the identification of performance obligations and other significant judgments used in applying the guidance of Topic 606 to the contract. Available for Sale Securities During the first quarter 2018 the Company adopted ASU No. 2016-01, which amended its accounting treatment for the recognition, measurement, presentation and disclosure of certain financial assets. ASU 2016-01 requires equity investments that have readily determinable fair values to be measured at fair value through net income. Previously, entities would recognize changes in fair value of available-for-sale equity securities in other comprehensive income, and would recognize in net income impairment losses that were other-than-temporary. There will no longer be an available-for-sale classification (with changes in fair value reported in other comprehensive income) for equity securities with readily determinable fair values. At December 31, 2017, the Company had equity securities classified as available-for-sale and reported at fair value of $238,000, with cumulative unrealized losses of $40,000 recorded in “Accumulated other comprehensive loss” on its Condensed Consolidated Balance Sheets. The Company has recognized the cumulative effect of initially adopting ASU 2016-01 by recording a negative adjustment to retained earnings and other comprehensive income of $40,000 at the beginning of 2018, included in the Company’s Condensed Consolidated Statement of Changes in Equity, and has recorded a loss of approximately $6,000 in “Interest and other income, net” in the accompanying Condensed Consolidated Statements of Operations and Comprehensive Loss for the period ended March 31, 2018 .

Cash and Cash Equivalents and S

Cash and Cash Equivalents and Short-Term Investments	3 Months Ended
	Mar. 31, 2018
Cash and Cash Equivalents and Short-Term Investments
Cash and Cash Equivalents and Short-Term Investments	4. Cash and Cash Equivalents and Short-term Investments The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Short-term investments include investments with maturities greater than three months, but not exceeding 12 months, or highly liquid investments with maturities greater than 12 months that the Company intends to liquidate during the next 12 months for working capital needs. The Company determines the appropriate classification of its investments in equity securities at the time of acquisition and re-evaluates those classifications at each balance sheet date. Trading securities at March 31, 2018 were marked to market with a loss of $6,000 due to the change in fair value for the three months ended March 31, 2018 recorded in “ interest and o ther income, net” in the Condensed Consolidated Statements of Operations and Comprehensive Loss. Available for sale investments at December 31, 2017 were marked to market with the cumulative negative change in fair value through December 31, 2017 of $40,000 recorded as a component of other comprehensive (loss) (see Note 3). The following tables summarize the Company’s short-term investments at March 31, 2018 and December 31, 2017: Estimated Carrying March 31, 2018 Cost Fair Value Value (in thousands) Investments: Short-term: Trading securities $ 275 $ 233 $ 233 Total trading securities 275 233 233 Total short term $ 275 $ 233 $ 233 December 31, 2017 Investments: Short-term: Available for sale common stock $ 275 $ 238 $ 238 Total available for sale common stock 275 238 238 Total short term $ 275 $ 238 $ 238 The short-term investments identified as trading securities at March 31, 2018 and available for sale common stock at December 31, 2017 consist of 7,500,000 common shares, approximately 10% of the outstanding common shares, of Golden Tag Resources, Ltd. (“Golden Tag”), a junior mining company that was a joint venture partner in the Company’s previously owned San Diego exploration property in Mexico. The Company acquired the shares during 2015 and 2016 in transactions involving the sale of its remaining 50% interest in the San Diego property to Golden Tag. Credit Risk The Company invests substantially all of its excess cash with high credit-quality financial institutions or in U.S. government or debt securities. Credit risk is the risk that a third party might fail to fulfill its performance obligations under the terms of a financial instrument. For cash and equivalents and investments, credit risk represents the carrying amount on the balance sheet. The Company mitigates credit risk for cash and equivalents and investments by placing its funds and investments with high credit-quality financial institutions, limiting the amount of exposure to each of the financial institutions, monitoring the financial condition of the financial institutions and investing only in government and corporate securities rated “investment grade” or better. The Company invests with financial institutions that maintain a net worth of not less than $1 billion and are members in good standing of the Securities Investor Protection Corporation.

Prepaid Expenses and Other Asse

Prepaid Expenses and Other Assets	3 Months Ended
	Mar. 31, 2018
Prepaid Expenses and Other Assets
Prepaid Expenses and Other Assets	5. Prepaid Expenses and Other Assets Prepaid expenses and other current assets consist of the following: March 31, December 31, 2018 2017 (in thousands) Prepaid insurance $ 304 $ 362 Deferred offering costs 137 137 Recoupable deposits and other 409 246 $ 850 $ 745 The deferred offering costs are related to the ATM Program discussed in detail in Note 14.

Inventories, net

Inventories, net	3 Months Ended
	Mar. 31, 2018
Inventories, net
Inventories, net	6. Inventories, net Inventories at the Velardeña Properties at March 31, 2018 and December 31, 2017 consist of the following: March 31, December 31, 2018 2017 (in thousands) Material and supplies $ 259 $ 242 $ 259 $ 242 The material and supplies inventory at March 31, 2018 and December 31, 2017 is reduced by a $0.2 million obsolescence charge reflected in shutdown and care and maintenance costs.

Value Added Tax Receivable, Net

Value Added Tax Receivable, Net	3 Months Ended
	Mar. 31, 2018
Value Added Tax Receivable, Net
Value Added Tax Receivable, Net	7. Value Added Tax Receivable, Net The Company has recorded value added tax (“VAT”) paid in Mexico and related to the Velardeña Properties as a recoverable asset. Mexico law allows for certain VAT payments to be recovered through ongoing applications for refunds. At March 31, 2018, the Company has also recorded approximately $11,000 of VAT receivable as a reduction to VAT payable in Mexico, which appears in “ Accounts payable and other accrued liabilities” on the Condensed Consolidated Balance Sheets. During the three months ended March 31, 2018 the Company utilized a VAT credit in Mexico that had been previously fully offset by a valuation allowance and recorded other income of $0.1 million, included in “ Other operating income, net ” in the accompanying Condensed Consolidated Statements of Operations and Comprehensive Loss. The Company has also paid VAT in Mexico as well as other countries, primarily related to exploration projects, which has been charged to expense as incurred because of the uncertainty of recoverability.

Property, Plant and Equipment,

Property, Plant and Equipment, Net	3 Months Ended
	Mar. 31, 2018
Property, Plant and Equipment, Net
Property, Plant and Equipment, Net	8. Property, Plant and Equipment, Net The components of property, plant and equipment are as follows: March 31, December 31, 2018 2017 (in thousands) Mineral properties $ 9,352 $ 9,352 Exploration properties 2,518 2,518 Royalty properties 200 200 Buildings 4,274 4,246 Mining equipment and machinery 15,964 15,989 Other furniture and equipment 959 958 Asset retirement cost 866 865 34,133 34,128 Less: Accumulated depreciation and amortization (26,267) (25,988) $ 7,866 $ 8,140 Minera Indé Equipment Sale In August 2016, the Company sold certain mining equipment consisting of two haul trucks, two scoop trams and a compressor to Minera Indé, an indirect subsidiary of The Sentient Group (“Sentient”), for $687,000 (see Note 20). The equipment sold was excess equipment held at the Company’s Velardeña Properties that the Company did not expect to use. The Company received $69,000 or 10% of the sales price at the closing of the sale, with the remaining $618,000 plus interest on the unpaid balance at an annual rate of 10% due in February 2017. With the approval of a Special Committee of the Company’s Board of Directors, the Company and Minera Indé amended the original equipment sale on March 31, 2017 to include the sale of an additional piece of excess equipment for $185,000 and extend the time for payment relating to the original equipment sale. Upon execution of the amendment the Company received an additional payment of $100,000. The remaining principal and interest balance, plus additional interest on the unpaid balance at an annual rate of 10%, was amended to be due in August 2017. For the three months ended March 31, 2017, the Company recorded a gain of $105,000 on the sale of the additional equipment, included in “ Other operating income, net ” in the accompanying Condensed Consolidated Statements of Operations and Comprehensive Loss, equal to the gross proceeds less the remaining basis in the equipment. On May 2, 2017, the Company received approximately $750,000 from Minera Indé as payment in full for the remaining balance due related to the equipment sale, including interest through that date. Celaya Farm-out In August 2016, the Company, through its wholly owned Mexican subsidiary, entered into an earn-in agreement with a 100% owned Mexican subsidiary of Electrum Global Holdings, L.P., a privately owned company (together “Electrum”), related to the Company’s Celaya exploration property in Mexico. The Company received an upfront payment of $0.2 million and Electrum agreed to incur exploration expenditures totaling at least $0.5 million in the first year of the agreement, reduced by certain costs Electrum previously incurred on the property since December 2015 in its ongoing surface exploration program. Electrum has earned the right to acquire an undivided 60% interest in a joint venture company to be formed to hold the Celaya project by incurring exploration expenditures totaling at least $2.5 million during the initial first three years of the agreement. Electrum would serve as manager of the joint venture. Prior to an amendment to the agreement, the Company would have been allowed to maintain a 40% interest in the Celaya project, following the initial earn-in period, by contributing its pro-rata share of an additional $2.5 million in exploration or development expenditures incurred over a second three-year period. In February 2018, the Company and Electrum amended the Celaya earn-in agreement to permit Electrum to earn, at its option, an additional 20% interest in the Celaya project in exchange for a payment of $1.0 million. Electrum can now increase its total interest in the project to 80% by contributing 100% of the $2.5 million of additional expenditures required in the second three-year earn-in period. Following the second earn-in period the Company will have the right to maintain its 20% participating interest or its interest could ultimately be converted into a carried 10% net profits interest if the Company elects not to participate as a joint venture owner. The Company has previously expensed all of its costs associated with the Celaya property and accordingly recognized a gain of $1.0 million from the execution of the amendment to the agreement in the period ended March 31, 2018, included in “ Other operating income, net ” in the accompanying Consolidated Statements of Operations and Comprehensive Loss. Zacatecas Farm-out In April 2016, the Company entered into an option agreement, which was later amended in February 2018, under which Santacruz Silver Mining Ltd. may acquire the Company’s interest the Zacatecas Properties for a series of payments totaling $1.5 million through September 2018. To date, Santacruz has paid the Company approximately $1.1 million, including $249,000 paid to the Company during the three months ended March 31, 2018. To complete the acquisition of the Zacatecas Properties Santacruz must make two additional payments of $225,000 each in June and September 2018. Santacruz has the right to terminate the option agreement at any time, and the agreement could be terminated, at the Company’s option, if Santacruz fails to make subsequent payments when due. If the agreement is terminated, the Zacatecas Properties revert back to the full ownership and control of the Company and any payments that have been made by Santacruz are nonrefundable. Upon receipt of each cash payment, the agreement imposes a performance obligation on the Company to provide Santacruz an exclusive right of control and access to the Zacatecas Properties to conduct exploration activities during the period from receipt of the payment until the next payment due date. The Company has previously expensed all of its costs associated with the Zacatecas Properties. Because of Santacruz’s ability to terminate the option agreement at any time, and the associated uncertainty relating to future payments, the Company only recognizes income, equal to the cash payments made, evenly over the period covered by each payment. The Company has recognized approximately $115,000 of income under the agreement for the three months ended March 31, 2018, included in “ Other operating income, net ” in the accompanying Consolidated Statements of Operations and Comprehensive Loss. The Company has also recorded a liability of approximately $183,000 at March 31, 2018 representing its unearned performance obligation related to the agreement, included in “Other current liabilities” as reported in its Condensed Consolidated Balance Sheets. Other items The asset retirement cost (“ARC”) is all related to the Company’s Velardeña Properties. The amounts for ARC have been fully depreciated as of March 31, 2018 and December 31, 2017. The small increase in the ARC during the period is related to an adjustment to the asset retirement obligation (“ARO”), as discussed below in Note 11.

Accounts Payable and Other Accr

Accounts Payable and Other Accrued Liabilities	3 Months Ended
	Mar. 31, 2018
Accounts Payable and Other Accrued Liabilities
Accounts Payable and Other Accrued Liabilities	9. Accounts Payable and Other Accrued Liabilities The Company’s accounts payable and other accrued liabilities consist of the following: March 31, December 31, 2018 2017 (in thousands) Accounts payable and accruals $ 339 $ 310 Accrued employee compensation and benefits 1,061 1,246 $ 1,400 $ 1,556 March 31, 2018 Accounts payable and accruals at March 31, 2018 consist primarily of $0.2 million due to contractors and suppliers and $0.1 million related to the Company’s Velardeña Properties and corporate administrative activities, respectively. In the case of the Velardeña Properties, amounts due also include a VAT payable that is partially offset by a small VAT receivable. Accrued employee compensation and benefits at March 31, 2018 consist of $0.2 million of accrued vacation payable and $0.9 million related to withholding taxes and benefits payable, of which $0.4 million is related to activities at the Velardeña Properties, and $0.5 million is related to the KELTIP (see Note 14). December 31, 2017 Accounts payable and accruals at December 31, 2017 are primarily related to amounts due to contractors and suppliers in the amounts of $0.1 million and $0.2 million related to the Company’s Velardeña Properties and corporate administrative activities, respectively. In the case of the Velardeña Properties, approximately $0.1 million is related to a net VAT payable. Accrued employee compensation and benefits at December 31, 2017 consist of $0.2 million of accrued vacation payable and $0.6 million related to withholding taxes and benefits payable, of which $0.3 million is related to activities at the Velardeña Properties and $0.4 million is related to the KELTIP (see Note 14).

Other Current Liabilities

Other Current Liabilities	3 Months Ended
	Mar. 31, 2018
Other Current Liabilities
Other Current Liabilities	10. Included in other current liabilities for the period ended March 31, 2017 is a $183,000 contract liability related to payments received under a contract involving the sale of the Zacatecas Properties to Santacruz. The contract liability represents a future performance obligation imposed on the Company under the terms of the contract and will be recorded to income as performance occurs during the second quarter of 2018 (see Notes 3 and 8).

Asset Retirement Obligation and

Asset Retirement Obligation and Reclamation Liabilities	3 Months Ended
	Mar. 31, 2018
Asset Retirement Obligation and Reclamation Liabilities
Asset Retirement Obligation and Reclamation Liabilities	11. Asset Retirement Obligation and Reclamation Liabilities The Company retained the services of a mining engineering firm to prepare a detailed closure plan for the Velardeña Properties. The plan was completed during the second quarter 2012 and indicated that the Company had an ARO and offsetting ARC of approximately $1.9 million. The Company will continue to accrue additional estimated ARO amounts based on an asset retirement plan as activities requiring future reclamation and remediation occur. During the first three months of 2018, the Company recognized approximately $51,000 of accretion expense and approximately $4,000 of amortization expense related to the ARC. The following table summarizes activity in the Velardeña Properties ARO: Three Months Ended March 31, 2018 2017 (in thousands) Beginning balance $ 2,448 $ 2,380 Changes in estimates, and other 1 (128) Accretion expense 51 49 Ending balance $ 2,500 $ 2,301 The change in the ARO recorded during the 2018 and 2017 periods are the result of changes in assumptions related to inflation factors and the timing of future expenditures used in the determination of future cash flows. The ARO set forth on the accompanying Condensed Consolidated Balance Sheets at March 31, 2018 and December 31, 2017 includes approximately $0.1 million of reclamation liabilities related to activities at the El Quevar project in Argentina.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Fair Value Measurements
Fair Value Measurements	12. Fair Value Measurements Financial assets and liabilities and nonfinancial assets and liabilities are measured at fair value under a framework of a fair value hierarchy which prioritizes the inputs into valuation techniques used to measure fair value into three broad levels. This hierarchy gives the highest priority to quoted prices (unadjusted) in active markets and the lowest priority to unobservable inputs. Further, financial assets and liabilities should be classified by level in their entirety based upon the lowest level of input that was significant to the fair value measurement. The three levels of the fair value hierarchy per ASC 820 are as follows: Level 1 : Unadjusted quoted market prices in active markets for identical assets or liabilities that are accessible at the measurement date. Level 2 : Quoted prices in inactive markets for identical assets or liabilities, quoted prices for similar assets or liabilities in active markets, or other observable inputs either directly related to the asset or liability or derived principally from corroborated observable market data. Level 3 : Unobservable inputs due to the fact that there is little or no market activity. This entails using assumptions in models which estimate what market participants would use in pricing the asset or liability. The following table summarizes the Company’s financial assets and liabilities at fair value on a recurring basis at March 31, 2018 and December 31, 2017, by respective level of the fair value hierarchy: Level 1 Level 2 Level 3 Total (in thousands) At March 31, 2018 Assets: Cash and cash equivalents $ 2,711 $ — $ — $ 2,711 Lease receivables 402 — — 402 Short-term investments 233 — — 233 $ 3,346 $ — $ — $ 3,346 At December 31, 2017 Assets: Cash and cash equivalents $ 3,250 $ — $ — $ 3,250 Lease receivables 314 — — 314 Short-term investments 238 — — 238 $ 3,802 $ — $ — $ 3,802 The Company’s cash equivalents, comprised principally of U.S. treasury securities, are classified within Level 1 of the fair value hierarchy. The Company’s trade accounts receivable are classified within Level 1 of the fair value hierarchy and are related to the lease of the oxide plant, valued per the terms of the lease rates per the plant lease agreement, and to the sale of mining equipment, based on the terms of the plant lease agreement. The Company’s short-term investments consist of the common stock in Golden Tag and are classified within Level 1 of the fair value hierarchy (see Note 4). Non-recurring Fair Value Measurements There were no non-recurring fair value measurements at March 31, 2018 or December 31, 2017.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Taxes
Income Taxes	13. Income Taxes The Company accounts for income taxes in accordance with the provisions of ASC 740, “Income Taxes” (“ASC 740”), on a tax jurisdictional basis. For the three months ended March 31, 2018 and March 31, 2017 the Company did not recognize any income tax benefit or expense. The Company operates in jurisdictions that have generated ordinary losses on a year-to-date basis. However, the Company is unable to recognize a benefit for those losses, except as described in this paragraph, thus an estimated effective tax rate has not been used to report the year-to-date results. In accordance with ASC 740, the Company presents deferred tax assets net of its deferred tax liabilities on a tax jurisdictional basis on its Condensed Consolidated Balance Sheets. As of March 31, 2018 and as of December 31, 2017, the Company had no net deferred tax assets or net deferred tax liabilities reported on its balance sheet. The Company, a Delaware corporation, and its subsidiaries file tax returns in the United States and in various foreign jurisdictions. The tax rules and regulations in these countries are highly complex and subject to interpretation. The Company’s income tax returns are subject to examination by the relevant taxing authorities and in connection with such examinations, disputes can arise with the taxing authorities over the interpretation or application of certain tax rules within the country involved. In accordance with ASC 740, the Company identifies and evaluates uncertain tax positions, and recognizes the impact of uncertain tax positions for which there is less than a more-likely-than-not probability of the position being upheld upon review by the relevant taxing authority. Such positions are deemed to be “unrecognized tax benefits” which require additional disclosure and recognition of a liability within the financial statements. The Company had no unrecognized tax benefits at March 31, 2018 or December 31, 2017.

Equity

Equity	3 Months Ended
	Mar. 31, 2018
Equity
Equity	14. Equity At the Market Offering Agreement In December 2016, the Company entered into an at-the-market offering agreement (as amended from time to time, the “ATM Agreement”) with H. C. Wainwright & Co., LLC (“Wainwright”), under which the Company may, from time to time, issue and sell shares of the Company’s common stock through Wainwright as sales manager in an at-the-market offering under a prospectus supplement for aggregate sales proceeds of up to $5.0 million (the “ATM Program”) or a maximum of 10 million shares. The ATM Agreement will remain in full force and effect until the earlier of December 31, 2018, or the date that the ATM Agreement is terminated in accordance with the terms therein. The common stock will be distributed at the market prices prevailing at the time of sale. As a result, prices of the common stock sold under the ATM Program may vary as between purchasers and during the period of distribution. The ATM Agreement provides that Wainwright will be entitled to compensation for its services at a commission rate of 2.0% of the gross sales price per share of common stock sold. The Company did not sell any stock under the ATM Program during the three months ended March 31, 2018. During the three months ended March 31, 2017 the Company sold an aggregate of approximately 640,000 common shares under the ATM Program at an average price of $0.74 per common share for gross proceeds of approximately $475,000. The Company paid cash commissions and other nominal transaction fees to Wainwright totaling approximately $11,000 or 2.2% of the gross proceeds and amortized approximately $15,000 of deferred accounting, legal and regulatory costs resulting in a net amount of approximately $449,000 that has been recorded as equity in the Condensed Consolidated Balance Sheets. During the three months ended March 31, 2017 the Company also incurred approximately $14,000 in additional accounting, legal, and regulatory costs associated with the ATM Program that were included in “ General and administrative costs ” in the Condensed Consolidated Statement of Operations and Comprehensive Loss. Equity Incentive Plans Under the Company’s Amended and Restated 2009 Equity Incentive Plan (the “Equity Plan”) awards of the Company’s common stock may be made to officers, directors, employees, consultants and agents of the Company and its subsidiaries. The Company recognizes stock-based compensation costs using a graded vesting attribution method whereby costs are recognized over the requisite service period for each separately vesting portion of the award. The following table summarizes the status of the Company’s restricted stock grants issued under the Equity Plan at March 31, 2018 and the changes during the three months then ended: Weighted Average Grant Date Fair Number of Value Per Restricted Stock Grants Shares Share Outstanding at December 31, 2017 203,334 $ 0.55 Granted during the period — — Restrictions lifted during the period — — Forfeited during the period — — Outstanding March 31, 2018 203,334 $ 0.55 For the three months ended March 31, 2018 the Company recognized approximately $13,000 of compensation expense related to the restricted stock grants. The Company expects to recognize additional compensation expense related to these awards of approximately $85,000 over the next thirty-two months. The following table summarizes the status of the Company’s stock option grants issued under the Equity Plan at March 31, 2018 and the changes during the three months then ended: Weighted Average Exercise Number of Price Per Equity Plan Options Shares Share Outstanding at December 31, 2017 40,310 $ 8.05 Granted during the period — — Forfeited or expired during period (10,000) $ 8.00 Exercised during period — — Outstanding March 31, 2018 30,310 $ 8.06 Exercisable at end of period 30,310 $ 8.06 Granted and vested 30,310 $ 8.06 Also, pursuant to the Equity Plan, the Company’s Board of Directors adopted the Non-Employee Director’s Deferred Compensation and Equity Award Plan (the “Deferred Compensation Plan”). Pursuant to the Deferred Compensation Plan the non-employee directors receive a portion of their compensation in the form of Restricted Stock Units (“RSUs”) issued The following table summarizes the status of the RSU grants issued under the Deferred Compensation Plan at March 31, 2018 and the changes during the three months then ended: Weighted Average Grant Date Fair Number of Value Per Restricted Stock Units Shares Share Outstanding at December 31, 2017 1,887,317 $ 1.16 Granted during the period — — Restrictions lifted during the period — — Forfeited during the period — — Outstanding at March 31, 2018 1,887,317 $ 1.16 For the three months ended March 31, 2018 the Company recognized approximately $33,000 of compensation expense related to the RSU grants. The Company expects to recognize additional compensation expense related to the RSU grants of approximately $22,000 over the next 3 months. Key Employee Long-Term Incentive Plan The Company’s 2013 Key Employee Long-Term Incentive Plan (the “KELTIP”) provides for the grant of units (“KELTIP Units”) to certain officers and key employees of the Company, which units will, once vested, entitle such officers and employees to receive an amount, in cash or in Company common stock issued pursuant to the Company’s Equity Plan, measured generally by the price of the Company’s common stock on the settlement date. KELTIP Units are not an actual equity interest in the Company and are solely unfunded and unsecured obligations of the Company that are not transferable and do not provide the holder with any stockholder rights. Payment of the settlement amount of vested KELTIP Units is deferred generally until the earlier of a change of control of the Company or the date the grantee ceases to serve as an officer or employee of the Company. The KELTIP Units are recorded as a liability, included in “ Accounts payable and other accrued liabilities ” in the Condensed Consolidated Balance Sheets. On May 23, 2017, the Company awarded a total of 435,000 KELTIP Units to two officers of the Company and recorded approximately $0.2 million of compensation expense, included in “ Stock based compensation ” in the Condensed Consolidated Statement of Operations and Comprehensive Loss. The KELTIP Units are marked to market at the end of each reporting period and for the three months ended March 31, 2018 the Company recognized an approximately $31,000 reduction to compensation expense. There were 1,020,000 KELTIP Units outstanding at March 31, 2018 and December 31, 2017. Common stock warrants The following table summarizes the status of the Company’s common stock warrants at March 31, 2018 and the changes during the three months then ended: Weighted Number of Average Exercise Underlying Price Per Common Stock Warrants Shares Share Outstanding at December 31, 2017 11,478,172 $ 0.81 Granted during period — — Dilution adjustment — — Expired during period — — Exercised during period — Outstanding at March 31, 2018 11,478,172 $ 0.81 The warrants relate to prior registered offerings and private placements of the Company’s stock. In September 2014, the Company closed on a registered public offering and concurrent private placement with Sentient in which it sold units, consisting of one share of common stock and a five-year warrant to acquire one half of a share of common stock at an exercise price of $1.21 per share. A total of 4,746,000 warrant shares were issued that became exercisable on March 11, 2015 and will expire on September 10, 2019, five years from the date of issuance. In May 2016, the Company issued 8.0 million registered shares of common stock at a purchase price of $0.50 per share in a registered direct offering (the “Offering”) resulting in gross proceeds of $4.0 million. In connection with the Offering, each investor received an unregistered warrant to purchase three ‐ quarters of a share of common stock for each share of common stock purchased. The resulting 6,000,000 warrant shares have an exercise price of $0.75 per share, became exercisable on November 7, 2016 and will expire on November 6, 2021, five years from the initial exercise date. Pursuant to the anti-dilution clauses in the 2014 warrant agreements, the exercise price of the warrants had been adjusted downward as a result of the subsequent issuance of the Company’s common stock in separate transactions, including the conversion of the Senior Secured Convertible Note which the Company entered into in October 2015 to borrow $5.0 million from Sentient, the Company’s largest stockholder, the May 2016 Offering and private placement, the ATM Program and the Hecla Share Issuance (defined herein). The number of shares of common stock issuable upon exercise of the September 2014 warrants has increased from the original 4,746,000 shares to 5,478,172 shares (732,172 share increase) and the exercise price has been reduced from the original $1.21 per share to $0.87 per share. The Company also issued warrants in September 2012 which expired on September 19, 2017, five years from the date of issuance. All of the warrants are recorded in equity at March 31, 2018 and December 31, 2017, as the result of a change in accounting principal during 2017 as discussed in Note 3.

Revenue, Deferred Revenue and R

Revenue, Deferred Revenue and Related Costs	3 Months Ended
	Mar. 31, 2018
Revenue, Deferred Revenue and Related Costs
Revenue, Deferred Revenue and Related Costs	15. Revenue, Deferred Revenue and Related Costs Oxide Plant Lease and Oxide Plant Lease Costs For the three months ended March 31, 2018 the Company recorded revenue of approximately $1.6 million and related costs of approximately $0.5 million associated with the lease of the Velardeña Properties oxide plant. The Company recognizes oxide plant lease fees and reimbursements for labor, utility and other costs as “ Revenue: Oxide plant lease ” in the Condensed Consolidated Statements of Operations and Comprehensive Loss following the guidance of ASC 606 regarding the income statement characterization of reimbursements received for certain expenses incurred by the Company in performing its obligations under the lease and reporting revenue gross as a principal versus net as an agent. ASC 606 supports recording as gross revenue fees received for the reimbursement of expenses in situations where the recipient is the primary obligor and has certain discretion in the incurrence of the reimbursable expense. The actual costs incurred for reimbursed direct labor and utility costs are reported as “ Oxide plant lease costs ” in the Condensed Consolidated Statements of Operations and Comprehensive Loss. The Company recognizes lease fees during the period the fees are earned per the terms of the lease. On August 2, 2017, the Company granted Hecla an option to extend the oxide plant lease for an additional period of up to two years ending no later than December 31, 2020 (the “Extension Period”) in exchange for a $1.0 million upfront cash payment and the purchase of $1.0 million, or approximately 1.8 million shares, of the Company’s common stock, issued at par at a price of $0.55 per share, based on an undiscounted 30-day volume weighted average stock price. The option and lease extension were memorialized in (i) an Option Agreement dated August 2, 2017 among the Company and Hecla Mining Company (the “Option Agreement”), and (ii) a Second Amendment to Master Agreement and Lease Agreement dated August 2, 2017 among Minera William S.A. de C.V., an indirect subsidiary of the Company, and Minera Hecla S.A. de C.V., an indirect subsidiary of Hecla Mining Company (the “Second Amendment”). Under the Second Amendment, Hecla must exercise the option to extend the lease no later than October 3, 2018. All of the fixed fees and throughput related charges remain the same as under the original lease. Similar volume limitations apply to any required future tailings expansions, which Hecla will fund, leaving unused at the end of the lease term an agreed amount of capacity in the expanded tailings facility. Pursuant to the Second Amendment, Hecla will have the right to terminate the lease during the Extension Period for any reason with 120 days’ notice. Hecla will also have a one-time right of first refusal to continue to lease the plant following a termination notice through December 31, 2020 if the Company decides to use the oxide plant for its own purposes before December 31, 2020. The Company will recognize the $1.0 million of income from granting the option over the expected life of the lease from August 2, 2017 through December 31, 2020 on a straight-line basis, including such income in “ Other operating income ” in the Condensed Consolidated Statements of Operations and Comprehensive Loss. During the three months ended March 31, 2018 the company recognized approximately $0.1 million of amortized income related to the upfront cash payment. As of March 31, 2018, the unamortized portion of the lease option totaled approximately $0.8 million recorded as short and long term “ Deferred revenue ” on the Condensed Consolidated Balance Sheets. For the three months ended March 31, 2017 the Company recorded revenue of approximately $1.6 million and related costs of approximately $0.5 million associated with the lease of the Velardeña Properties oxide plant.

Interest and Other Income

Interest and Other Income	3 Months Ended
	Mar. 31, 2018
Interest and Other Income
Interest and Other Income	16. Interest and Other Income For the three months ended March 31, 2018 and 2017 the Company had only a nominal amount of interest and other income. The 2017 amount is primarily related to interest on amounts receivable from the sale of certain mining equipment as discussed in Note 8.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	3 Months Ended
	Mar. 31, 2018
Supplemental Cash Flow Information
Supplemental Cash Flow Information	17. Supplemental Cash Flow Information The following table reconciles net loss for the period to cash used in operations: Three Months Ended March 31, 2018 2017 (in thousands) Cash flows from operating activities: Net loss $ (735) $ (1,073) Adjustments to reconcile net loss to net cash used in operating activities: Depreciation and amortization 296 188 Accretion of asset retirement obligation 51 49 Loss on trading securities 6 — Asset write off 7 — Gain on reduction of asset retirement obligation — (56) Gain on sale of assets (1,115) (115) Stock compensation 15 65 Changes in operating assets and liabilities: Increase in trade accounts receivable (88) (193) (Increase) decrease in prepaid expenses and other assets (105) 137 Increase in inventories (17) (24) Decrease (Increase) in value added tax recoverable, net 127 (6) Decrease in deferred revenue (72) — Decrease (increase) in reclamation liability (3) 2 Decrease in accounts payable and accrued liabilities (119) (56) Decrease in deferred leasehold payments (8) (5) Net cash used in operating activities $ (1,760) $ (1,087)

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies
Commitments and Contingencies	18. Commitments and Contingencies At March 31, 2018 and December 31, 2017, the Company had no gain or loss contingencies. The Company has certain purchase and lease commitments as set forth in the Company’s Form 10-K for the year ended December 31, 2017.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2018
Segment Information
Segment Information	19. Segment Information The Company’s sole activity is the mining, construction and exploration of mineral properties containing precious metals. The Company’s reportable segments are based upon the Company’s revenue producing activities and cash consuming activities. The Company reports two segments, one for its Velardeña Properties in Mexico and the other comprised of non-revenue producing activities including exploration, construction and general and administrative activities. Intercompany revenue and expense amounts have been eliminated within each segment in order to report on the basis that management uses internally for evaluating segment performance. The financial information relating to the Company’s segments is as follows: Exploration, El Costs Depreciation, Quevar, Velardeña Three Months Ended Applicable Depletion and and Administrative Pre-Tax (gain) Capital March 31, 2018 Revenue to Sales Amortization Expense loss Total Assets Expenditures Velardeña Properties $ 1,637 $ 503 $ 203 $ 588 $ (217) $ 6,661 $ 28 Corporate, Exploration & Other — — 93 2,133 952 5,673 — $ 1,637 $ 503 $ 296 $ 2,721 $ 735 $ 12,334 $ 28 Three Months Ended March 31, 2017 Velardeña Properties $ 1,644 $ 537 $ 91 $ 357 $ (774) $ 7,795 $ — Corporate, Exploration & Other — — 97 1,701 1,847 5,459 — $ 1,644 $ 537 $ 188 $ 2,058 $ 1,073 $ 13,254 $ —

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2018
Related Party Transactions
Related Party Transactions	20. Related Party Transactions The following sets forth information regarding transactions between the Company (and its subsidiaries) and its officers, directors and significant stockholders. Sale of Equipment: In August 2016, the Company sold certain mining equipment to Minera Indé, an indirect subsidiary of Sentient, for $687,000 (see Note 8), in a transaction approved by the Company’s Audit Committee and Board of Directors. At March 31, 2018 Sentient, through the Sentient executive funds, holds approximately 45% of the Company’s 92.0 million shares of issued and outstanding common stock. The equipment sold was excess equipment held at the Company’s Velardeña Properties that the Company did not expect to use. The Company used a third party consultant with experience in the used mining equipment market in Mexico to determine a fair value. The Company believes the price paid was at least equal to the fair market value of the equipment had it been sold through auction or in the open market. The Company received 10% of the sales price at the closing of the sale in August 2016, with the remainder, plus interest on the unpaid balance at an annual rate of 10%, due in February 2017. With the approval of a Special Committee of the Company’s Board of Directors, the Company and Minera Indé amended the original equipment sale on March 31, 2017 to include the sale of an additional piece of excess equipment for $185,000 and extend the time for payment relating to the original equipment sale. Upon execution of the amendment the Company received an additional payment of $100,000. The remaining principal and interest balance, plus additional interest on the unpaid balance at an annual rate of 10%, was amended to be due in August 2017. For the three months ended March 31, 2017, the Company recorded a gain of $105,000 on the sale of the additional equipment, included in “ Other operating income ” in the accompanying Condensed Consolidated Statements of Operations and Comprehensive Loss, equal to the gross proceeds less the remaining basis in the equipment. On May 2, 2017, the Company received approximately $750,000 from Minera Indé as payment in full for the remaining balance due related to the equipment sale, including interest through that date. Administrative Services: Beginning in August 2016, the Company began providing limited accounting and other administrative services to Minera Indé, an indirect subsidiary of Sentient. The services are provided locally in Mexico by the administrative staff at the Company’s Velardeña Properties. The Company charges Minera Indé $15,000 per month for the services, which provides reimbursement to the Company for its costs incurred plus a small profit margin. Amounts received under the arrangement reduce costs incurred for the care and maintenance of the Velardeña Properties and allows the Company to maintain a larger more experienced staff at the Velardeña Properties to support the oxide plant lease and potential future mining or processing activities. The Company’s Board of Directors and Audit Committee approved the agreement. For the three months ended March 31, 2018 and 2017 the Company charged Minera Indé approximately $45,000 for services, offsetting costs that are recorded in “ Velardeña shutdown and care and maintenance ” in the Condensed Consolidated Statements of Operations and Comprehensive Loss.

Cash and Cash Equivalents and27

Cash and Cash Equivalents and Short-Term Investments (Tables)	3 Months Ended
	Mar. 31, 2018
Cash and Cash Equivalents and Short-Term Investments
Schedule of short term-investments	Estimated Carrying March 31, 2018 Cost Fair Value Value (in thousands) Investments: Short-term: Trading securities $ 275 $ 233 $ 233 Total trading securities 275 233 233 Total short term $ 275 $ 233 $ 233 December 31, 2017 Investments: Short-term: Available for sale common stock $ 275 $ 238 $ 238 Total available for sale common stock 275 238 238 Total short term $ 275 $ 238 $ 238

Prepaid Expenses and Other As28

Prepaid Expenses and Other Assets (Tables)	3 Months Ended
	Mar. 31, 2018
Prepaid Expenses and Other Assets
Schedule of prepaid expenses and other current assets	March 31, December 31, 2018 2017 (in thousands) Prepaid insurance $ 304 $ 362 Deferred offering costs 137 137 Recoupable deposits and other 409 246 $ 850 $ 745

Inventories, net (Tables)

Inventories, net (Tables)	3 Months Ended
	Mar. 31, 2018
Inventories, net
Schedule of inventories at the Velardena Properties	March 31, December 31, 2018 2017 (in thousands) Material and supplies $ 259 $ 242 $ 259 $ 242

Property, Plant and Equipment30

Property, Plant and Equipment, Net (Tables)	3 Months Ended
	Mar. 31, 2018
Property, Plant and Equipment, Net
Schedule of components of property, plant and equipment	March 31, December 31, 2018 2017 (in thousands) Mineral properties $ 9,352 $ 9,352 Exploration properties 2,518 2,518 Royalty properties 200 200 Buildings 4,274 4,246 Mining equipment and machinery 15,964 15,989 Other furniture and equipment 959 958 Asset retirement cost 866 865 34,133 34,128 Less: Accumulated depreciation and amortization (26,267) (25,988) $ 7,866 $ 8,140

Accounts Payable and Other Ac31

Accounts Payable and Other Accrued Liabilities (Tables)	3 Months Ended
	Mar. 31, 2018
Accounts Payable and Other Accrued Liabilities
Schedule of accounts payable and other accrued liabilities	March 31, December 31, 2018 2017 (in thousands) Accounts payable and accruals $ 339 $ 310 Accrued employee compensation and benefits 1,061 1,246 $ 1,400 $ 1,556

Asset Retirement Obligation a32

Asset Retirement Obligation and Reclamation Liabilities (Tables)	3 Months Ended
	Mar. 31, 2018
Asset Retirement Obligation and Reclamation Liabilities
Summary of activity in the Velardena Properties ARO	Three Months Ended March 31, 2018 2017 (in thousands) Beginning balance $ 2,448 $ 2,380 Changes in estimates, and other 1 (128) Accretion expense 51 49 Ending balance $ 2,500 $ 2,301

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Measurements
Schedule of financial assets and liabilities at fair value	Level 1 Level 2 Level 3 Total (in thousands) At March 31, 2018 Assets: Cash and cash equivalents $ 2,711 $ — $ — $ 2,711 Lease receivables 402 — — 402 Short-term investments 233 — — 233 $ 3,346 $ — $ — $ 3,346 At December 31, 2017 Assets: Cash and cash equivalents $ 3,250 $ — $ — $ 3,250 Lease receivables 314 — — 314 Short-term investments 238 — — 238 $ 3,802 $ — $ — $ 3,802

Equity (Tables)

Equity (Tables)	3 Months Ended
	Mar. 31, 2018
Equity
Schedule of status of the restricted stock grants issued under the Equity Plan	Weighted Average Grant Date Fair Number of Value Per Restricted Stock Grants Shares Share Outstanding at December 31, 2017 203,334 $ 0.55 Granted during the period — — Restrictions lifted during the period — — Forfeited during the period — — Outstanding March 31, 2018 203,334 $ 0.55
Schedule of status of the stock option grants issued under the Equity Plan	Weighted Average Exercise Number of Price Per Equity Plan Options Shares Share Outstanding at December 31, 2017 40,310 $ 8.05 Granted during the period — — Forfeited or expired during period (10,000) $ 8.00 Exercised during period — — Outstanding March 31, 2018 30,310 $ 8.06 Exercisable at end of period 30,310 $ 8.06 Granted and vested 30,310 $ 8.06
Schedule of restricted stock units	Weighted Average Grant Date Fair Number of Value Per Restricted Stock Units Shares Share Outstanding at December 31, 2017 1,887,317 $ 1.16 Granted during the period — — Restrictions lifted during the period — — Forfeited during the period — — Outstanding at March 31, 2018 1,887,317 $ 1.16
Summary of the status of the Company's common stock warrants	Weighted Number of Average Exercise Underlying Price Per Common Stock Warrants Shares Share Outstanding at December 31, 2017 11,478,172 $ 0.81 Granted during period — — Dilution adjustment — — Expired during period — — Exercised during period — Outstanding at March 31, 2018 11,478,172 $ 0.81

Supplemental Cash Flow Inform35

Supplemental Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2018
Supplemental Cash Flow Information
Schedule of reconciliation of net loss for the period to cash used in operations	Three Months Ended March 31, 2018 2017 (in thousands) Cash flows from operating activities: Net loss $ (735) $ (1,073) Adjustments to reconcile net loss to net cash used in operating activities: Depreciation and amortization 296 188 Accretion of asset retirement obligation 51 49 Loss on trading securities 6 — Asset write off 7 — Gain on reduction of asset retirement obligation — (56) Gain on sale of assets (1,115) (115) Stock compensation 15 65 Changes in operating assets and liabilities: Increase in trade accounts receivable (88) (193) (Increase) decrease in prepaid expenses and other assets (105) 137 Increase in inventories (17) (24) Decrease (Increase) in value added tax recoverable, net 127 (6) Decrease in deferred revenue (72) — Decrease (increase) in reclamation liability (3) 2 Decrease in accounts payable and accrued liabilities (119) (56) Decrease in deferred leasehold payments (8) (5) Net cash used in operating activities $ (1,760) $ (1,087)

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Information
Schedule of financial information relating to segments	Exploration, El Costs Depreciation, Quevar, Velardeña Three Months Ended Applicable Depletion and and Administrative Pre-Tax (gain) Capital March 31, 2018 Revenue to Sales Amortization Expense loss Total Assets Expenditures Velardeña Properties $ 1,637 $ 503 $ 203 $ 588 $ (217) $ 6,661 $ 28 Corporate, Exploration & Other — — 93 2,133 952 5,673 — $ 1,637 $ 503 $ 296 $ 2,721 $ 735 $ 12,334 $ 28 Three Months Ended March 31, 2017 Velardeña Properties $ 1,644 $ 537 $ 91 $ 357 $ (774) $ 7,795 $ — Corporate, Exploration & Other — — 97 1,701 1,847 5,459 — $ 1,644 $ 537 $ 188 $ 2,058 $ 1,073 $ 13,254 $ —

Basis of Preparation of Finan37

Basis of Preparation of Financial Statements and Nature of Operations (Details) $ / shares in Units, $ in Thousands, shares in Millions	Aug. 02, 2017USD ($)$ / sharesshares	Mar. 31, 2018USD ($)property	Mar. 31, 2017USD ($)
Shutdown and care and maintenance costs		$ 489	$ 350
Number of exploration properties | property		10
Velardena properties
Interest acquired (as a percent)		100.00%
Shutdown and care and maintenance costs		$ 500	$ 400
Quarterly holding costs expected with suspended operations		400
Oxide Plant
Expected lease proceeds	$ 1,000	100
Renewal term	2 years
Proceeds from lease	$ 1,000
Gross proceeds from common stock sale	$ 1,000
Common stock issued (in shares) | shares	1.8
Sale price (in dollars per shares) | $ / shares	$ 0.55
Volume weighted average stock price period	30 days
Oxide Plant | Hecla
Expected lease proceeds		$ 4,500

Change in Accounting Principle

Change in Accounting Principle (Details)	3 Months Ended			12 Months Ended
	Mar. 31, 2018USD ($)item	Dec. 31, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Aug. 31, 2016USD ($)
Change in Accounting Principle
Warrant liability			$ 2,000,000		$ 1,900,000
Warrant derivative loss (gain)			100,000		(17,100,000)
Accumulated Deficit	$ (509,907,000)	$ (509,082,000)		$ (509,082,000)
Number of open contracts | item	1
Gain on sale of assets	$ 1,115,000		115,000
Trading securities		238,000		238,000
Available for sale equity unrealized losses				40,000
Retained earnings and other comprehensive income adjustment	(40,000)
Trading securities loss	6,000
ASU 2017-11 Earnings Per Share
Change in Accounting Principle
Warrant derivative loss (gain)			$ 1,000		$ 300,000
Sale, not discontinued operations | Zacatecas
Change in Accounting Principle
Total consideration	1,500,000					$ 1,500,000
Gain on sale of assets	115,000
Sale, not discontinued operations | Zacatecas | ASU 2014-09 Revenue from Contracts with Customers
Change in Accounting Principle
Gain on sale of assets	$ 49,000
Sale, not discontinued operations | Zacatecas | Previously Reported
Change in Accounting Principle
Gain on sale of assets		49,000
Sale, not discontinued operations | Zacatecas | Cumulative Effect Adjustment | ASU 2014-09 Revenue from Contracts with Customers
Change in Accounting Principle
Accumulated Deficit		$ (49,000)		$ (49,000)

Cash and Cash Equivalents and39

Cash and Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Investments:
Trading securities loss	$ 6
Retained earnings and other comprehensive income adjustment	(40)
Trading securities, cost	275			$ 275
Total short term, cost	275			275
Trading securities				238
Total short term	233			238
Financial institutions minimum net worth	$ 1,000,000
Golden Tag
Investments:
Investment shares held (in shares)	7,500,000
Ownership in property (as a percent)	10.00%
Trading securities
Investments:
Trading securities, cost	$ 275
Equity Securities
Investments:
Trading securities, cost				275
Estimated Fair Value.
Investments:
Trading securities	233			238
Total short term	233			238
Estimated Fair Value. | Trading securities
Investments:
Trading securities	233
Estimated Fair Value. | Equity Securities
Investments:
Trading securities				238
Carrying Value.
Investments:
Trading securities	233			238
Total short term	233			238
Carrying Value. | Trading securities
Investments:
Trading securities	$ 233
Carrying Value. | Equity Securities
Investments:
Trading securities				$ 238
San Diego | Golden Tag
Investments:
Ownership in property (as a percent)		50.00%	50.00%

Prepaid Expenses and Other As40

Prepaid Expenses and Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Prepaid Expenses and Other Assets
Prepaid insurance	$ 304	$ 362
Deferred offering costs	137	137
Recoupable deposits and other	409	246
Prepaid expenses and other assets	$ 850	$ 745

Inventories, net (Details)

Inventories, net (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Inventories, net
Material and supplies	$ 259	$ 242
Inventories, net	259	242
Inventory write down	$ 200	$ 200

Value Added Tax Receivable, N42

Value Added Tax Receivable, Net (Details) - Mexico	3 Months Ended
	Mar. 31, 2018USD ($)
VAT receivables offset against VAT payable	$ 11,000
Reversed valuation allowance	$ 100,000

Property, Plant and Equipment43

Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property, plant and equipment
Property, plant and equipment, gross	$ 34,133	$ 34,128
Less: Accumulated depreciation & amortization	(26,267)	(25,988)
Property, plant and equipment, net	7,866	8,140
Mineral properties
Property, plant and equipment
Property, plant and equipment, gross	9,352	9,352
Exploration properties
Property, plant and equipment
Property, plant and equipment, gross	2,518	2,518
Royalty properties
Property, plant and equipment
Property, plant and equipment, gross	200	200
Buildings
Property, plant and equipment
Property, plant and equipment, gross	4,274	4,246
Mining equipment and machinery
Property, plant and equipment
Property, plant and equipment, gross	15,964	15,989
Other furniture and equipment
Property, plant and equipment
Property, plant and equipment, gross	959	958
Asset retirement cost
Property, plant and equipment
Property, plant and equipment, gross	$ 866	$ 865

Property, Plant and Equipment44

Property, Plant and Equipment, Net - Disposals (Details)	May 02, 2017USD ($)	Mar. 31, 2017USD ($)	Feb. 28, 2018USD ($)	Aug. 31, 2016USD ($)item	Mar. 31, 2018USD ($)payment	Mar. 31, 2017USD ($)	Mar. 31, 2018USD ($)
Property, plant and equipment
Proceeds from sale of assets					$ 1,249,000	$ 115,000
Gain on sale of assets					1,115,000	115,000
Sale, not discontinued operations | Sale of Equipment
Property, plant and equipment
Number of haul trucks sold | item				2
Number of scoop trams sold | item				2
Sale of mining equipments		$ 185,000		$ 687,000
Proceeds from sale of assets	$ 750,000	$ 100,000		$ 69,000
Sales price received (as a percent)				10.00%
Related party receivable				$ 618,000
Interest rate on receivable (as a percent)		10.00%		10.00%
Gain on sale of assets						$ 105,000
Celaya | Sale, not discontinued operations
Property, plant and equipment
Proceeds from sale of assets				$ 200,000
Gain on sale of assets					1,000,000
Interest in joint venture (as a percent)			20.00%	40.00%
Exploration expenditures in first three year of the agreement				$ 2,500,000
Initial term of agreement				3 years
Term of second agreement			3 years	3 years
Net profit interest			10.00%
Celaya | Electrum | Sale, not discontinued operations
Property, plant and equipment
Earn-in to be received			$ 1,000,000	$ 500,000
Interest in joint venture (as a percent)			80.00%	60.00%
Exploration expenditures in first three year of the agreement				$ 2,500,000
Additional interest in joint venture (as a percent)			20.00%
Exploration expenditures in second three year of the agreement			$ 2,500,000
Contribution from additional expenditures required in the second three-year earn-in period (as a percent)			100.00%
Zacatecas | Sale, not discontinued operations
Property, plant and equipment
Proceeds from sale of assets					249,000		$ 1,100,000
Gain on sale of assets					115,000
Total consideration				$ 1,500,000	$ 1,500,000		1,500,000
Number of additional payments | payment					2
Payment to be received					$ 225,000		225,000
Unearned performance obligation					$ 183,000		$ 183,000

Accounts Payable and Other Ac45

Accounts Payable and Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts payable and accruals	$ 339	$ 310
Accrued employee compensation and benefits	1,061	1,246
Accounts payable and other accrued liabilities	1,400	1,556
Accrued vacation	200	200
Withholding taxes and benefits payable	900	600
KELTIP
Withholding taxes and benefits payable	500
Velardena properties
Accounts payable and accruals	200	100
Withholding taxes and benefits payable	400	300
VAT payable, net		100
Corporate, Exploration & Other
Accounts payable and accruals	$ 100	200
Withholding taxes and benefits payable		$ 400

Other Current Liabilities (Deta

Other Current Liabilities (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Property, Plant and Equipment [Line Items]
Contract liability related to payments	$ 293,000	$ 293,000
Sale of Equipment | Zacatecas
Property, Plant and Equipment [Line Items]
Contract liability related to payments			$ 183,000

Asset Retirement Obligation a47

Asset Retirement Obligation and Reclamation Liabilities (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2012
Asset retirement and reclamation liabilities	$ 2,495,000
Summary of activity in the Velardena Operations ARO
ARO, Beginning balance	2,495,000
Accretion expense	51,000	$ 49,000
ARO, Ending balance	2,544,000
Velardena properties
Asset retirement and reclamation liabilities	2,448,000	2,380,000	$ 1,900,000
Amortization expense related to the ARC	4,000
Summary of activity in the Velardena Operations ARO
ARO, Beginning balance	2,448,000	2,380,000
Changes in estimates, and other	1,000	(128,000)
Accretion expense	51,000	49,000
ARO, Ending balance	2,500,000	$ 2,301,000
El Quevar Project
Asset retirement and reclamation liabilities	100,000
Summary of activity in the Velardena Operations ARO
ARO, Beginning balance	100,000
ARO, Ending balance	$ 100,000

Fair value measurements (Detail

Fair value measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Recurring
Fair value measurements
Cash and cash equivalents	$ 2,711	$ 3,250
Lease receivable	402	314
Short-term investments	233	238
Assets	3,346	3,802
Recurring | Level 1
Fair value measurements
Cash and cash equivalents	2,711	3,250
Lease receivable	402	314
Short-term investments	233	238
Assets	3,346	3,802
Non-recurring
Fair value Assumptions
Fair value measurements	$ 0	$ 0

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Income Taxes
Net deferred tax assets	$ 0	$ 0
Net deferred tax liabilities	0	0
Unrecognized tax benefits	$ 0	$ 0

Equity - Issue and Conversion (

Equity - Issue and Conversion (Details) - USD ($)	1 Months Ended	3 Months Ended
	Dec. 31, 2016	Mar. 31, 2017
Proceeds from issuance of common stock, net of issuance costs		$ 449,000
ATM Agreement
Aggregate value of securities allowed under agreement	$ 5,000,000
Aggregate securities allowed under agreement (in shares)	10,000,000
Common stock issued (in shares)		640,000
Sale price (in dollars per shares)		$ 0.74
Gross proceeds from common stock sale		$ 475,000
Commission payment		$ 11,000
Commission rate (as a percent)	2.00%	2.20%
Amortization of deferred cost		$ 15,000
Proceeds from issuance of common stock, net of issuance costs		449,000
Equity issue costs		$ 14,000

Equity - Non-Option Incentive (

Equity - Non-Option Incentive (Details)	May 23, 2017USD ($)employeeshares	Sep. 30, 2014shares	Mar. 31, 2018USD ($)$ / sharesshares	Mar. 31, 2017USD ($)
Weighted Average Grant Date Fair Value Per Share - Non-option
Compensation expense | $			$ 15,000	$ 65,000
Sentient | 2014 Warrants
Number of Shares - Non-option
Granted during the year (in shares)		4,746,000
KELTIP Units
Number of Shares - Non-option
Outstanding at beginning of year (in shares)			1,020,000
Outstanding at end of year (in shares)			1,020,000
Weighted Average Grant Date Fair Value Per Share - Non-option
Compensation expense | $			$ (31,000)
KELTIP Units | Officers
Number of Shares - Non-option
Granted during the year (in shares)	435,000
Weighted Average Grant Date Fair Value Per Share - Non-option
Compensation expense | $	$ 200,000
Number of employees | employee	2
Equity Plan | Restricted Stock
Number of Shares - Non-option
Outstanding at beginning of year (in shares)			203,334
Outstanding at end of year (in shares)			203,334
Weighted Average Grant Date Fair Value Per Share - Non-option
Outstanding at beginning of year (in dollars per share) | $ / shares			$ 0.55
Outstanding at end of year (in dollars per share) | $ / shares			$ 0.55
Compensation expense | $			$ 13,000
Additional compensation expense expected to be recognized | $			$ 85,000
Period for future recognition of additional compensation expense			32 months
Deferred Compensation Plan | Restricted Stock Units (RSUs)
Number of Shares - Non-option
Outstanding at beginning of year (in shares)			1,887,317
Outstanding at end of year (in shares)			1,887,317
Weighted Average Grant Date Fair Value Per Share - Non-option
Outstanding at beginning of year (in dollars per share) | $ / shares			$ 1.16
Outstanding at end of year (in dollars per share) | $ / shares			$ 1.16
Compensation expense | $			$ 33,000
Additional compensation expense expected to be recognized | $			$ 22,000
Period for future recognition of additional compensation expense			3 months
Number of unrestricted shares Director to receive for vested RSU upon termination from board			1

Equity - Option Incentive (Deta

Equity - Option Incentive (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Weighted Average Exercise Price Per Share - Options
Compensation expense	$ 15	$ 65
Employee Stock Option | Equity Plan
Number of Shares - Options
Outstanding at beginning of period (in shares)	40,310
Forfeited or expired during period (in shares)	(10,000)
Exercised during period (in shares)	0
Outstanding at end of year (in shares)	30,310
Exercisable at end of period (in shares)	30,310
Granted and vested (in shares)	30,310
Weighted Average Exercise Price Per Share - Options
Outstanding at beginning of year (in dollars per share)	$ 8.05
Forfeited or expired during year (in dollars per share)	8
Exercised during period (in dollars per share)	0
Outstanding at end of year (in dollars per share)	8.06
Exercisable at end of period (in dollars per share)	8.06
Granted and vested (in dollars per share)	$ 8.06

Equity - Warrants (Details)

Equity - Warrants (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended			3 Months Ended
	May 31, 2016	Sep. 30, 2014	Sep. 30, 2012	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016	Oct. 31, 2015
Weighted Average Exercise Price Per Share
Warrant liability					$ 2	$ 1.9
Warrant
Number of Underlying Shares
Outstanding, beginning balance (in shares)				11,478,172
Outstanding, end balance (in shares)				11,478,172
Weighted Average Exercise Price Per Share
Outstanding, beginning balance (in dollars per share)				$ 0.81
Outstanding, end balance (in dollars per share)				$ 0.81
2012 Warrants
Weighted Average Exercise Price Per Share
Term of warrants			5 years
2014 Warrants
Number of Underlying Shares
Dilution adjustment (in shares)				732,172
Outstanding, end balance (in shares)				5,478,172
Weighted Average Exercise Price Per Share
Outstanding, end balance (in dollars per share)				$ 0.87
Sentient
Weighted Average Exercise Price Per Share
Principal amount of loan							$ 5
Sentient | 2014 Warrants
Weighted Average Exercise Price Per Share
Outstanding, end balance (in dollars per share)		$ 1.21
Number of shares of common stock per capital unit (in shares)		1
Term of warrants		5 years
Number of common shares which can be purchased with each warrant		0.5
Registered Offering
Weighted Average Exercise Price Per Share
Sale price (in dollars per shares)	$ 0.50
Common stock issued (in shares)	8,000,000
Gross proceeds from common stock sale	$ 4
Registered Offering | 2016 Warrants
Number of Underlying Shares
Outstanding, end balance (in shares)	6,000,000
Weighted Average Exercise Price Per Share
Granted (in dollars per share)	$ 0.75
Number of shares of common stock per capital unit (in shares)	0.75
Term of warrants	5 years

Revenue, Deferred Revenue and54

Revenue, Deferred Revenue and Related Costs (Details) $ / shares in Units, $ in Thousands, shares in Millions	Aug. 02, 2017USD ($)$ / sharesshares	Aug. 31, 2017item	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)
Oxide plant lease			$ 1,637	$ 1,644
Lease related costs			503	537
Oxide Plant
Oxide plant lease			1,600	1,600
Lease related costs			500	$ 500
Renewal term	2 years
Expected lease proceeds	$ 1,000		100
Gross proceeds from common stock sale	$ 1,000
Common stock issued (in shares) | shares	1.8
Sale price (in dollars per shares) | $ / shares	$ 0.55
Volume weighted average stock price period	30 days
Termination notice period		120 days
Number of rights of first refusal | item		1
Deferred revenue			$ 800

Supplemental Cash Flow Inform55

Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net loss	$ (735)	$ (1,073)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	296	188
Accretion of asset retirement obligation	51	49
Loss on trading securities	6
Asset write off	7
Gain on reduction of asset retirement obligation		(56)
Gain on sale of assets	(1,115)	(115)
Warrant liability fair market adjustment		100	$ (17,100)
Stock compensation	15	65
Changes in operating assets and liabilities:
Decrease in trade accounts receivable	(88)	(193)
Increase in prepaid expenses and other assets	(105)	137
Decrease in inventories	(17)	(24)
(Increase) decrease in value added tax recoverable, net	127	(6)
Decrease in deferred revenue	(72)
Decrease in reclamation liability	(3)	2
Increase (decrease) in accounts payable and accrued liabilities	(119)	(56)
Decrease in deferred leasehold payments	(8)	(5)
Net cash used in operating activities	$ (1,760)	$ (1,087)

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Contingencies
Loss contingency	$ 0	$ 0

Segment Information (Details)

Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)segment	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)
Segment Information
Number of reportable segments | segment	2
Revenue	$ 1,637	$ 1,644
Depreciation, depletion and amortization	296	188
Exploration, El Quevar, Velardena and Administrative Expense	2,721	2,058
Pre-tax (gain) loss	735	1,073
Total Assets	12,334	13,254	$ 13,077
Capital Expenditures	28
Minerals
Segment Information
Costs Applicable to Sales	$ 503	537
Velardena properties
Segment Information
Number of reportable segments | segment	1
Revenue	$ 1,637	1,644
Depreciation, depletion and amortization	203	91
Exploration, El Quevar, Velardena and Administrative Expense	588	357
Pre-tax (gain) loss	(217)	(774)
Total Assets	6,661	7,795
Capital Expenditures	28
Velardena properties | Minerals
Segment Information
Costs Applicable to Sales	503	537
Corporate, Exploration & Other
Segment Information
Depreciation, depletion and amortization	93	97
Exploration, El Quevar, Velardena and Administrative Expense	2,133	1,701
Pre-tax (gain) loss	952	1,847
Total Assets	$ 5,673	$ 5,459

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($)	May 02, 2017	Mar. 31, 2017	Aug. 31, 2016	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Related Party Transaction
Common stock, shares issued				91,929,709		91,929,709
Proceeds from sale of assets				$ 1,249,000	$ 115,000
Gain on sale of assets				$ 1,115,000	115,000
Sentient
Related Party Transaction
Ownership (as a percent)				45.00%
Minera Inde | Administrative Services
Related Party Transaction
Monthly charges received			$ 15,000
Received amount				$ 45,000	45,000
Sale, not discontinued operations | Sale of Equipment
Related Party Transaction
Sale of mining equipments		$ 185,000	$ 687,000
Sales price received (as a percent)			10.00%
Interest rate on receivable (as a percent)		10.00%	10.00%
Related party receivable			$ 618,000
Proceeds from sale of assets	$ 750,000	$ 100,000	69,000
Gain on sale of assets					105,000
Sale, not discontinued operations | Sale of Equipment | Minera Inde
Related Party Transaction
Sale of mining equipments			$ 687,000
Sales price received (as a percent)			10.00%
Interest rate on receivable (as a percent)		10.00%	10.00%
Gain (Loss) on Disposition of Assets					$ 105,000
Property, Plant and Equipment, Disposals		$ 185,000
Proceeds from sale of assets	$ 750,000	$ 100,000