Property, plant, equipment, mine development, land and construction in progress, net (Schedule of Property, Plant, Equipment, Mine Development, Land and Construction in Progress) (Details) (USD $) | Sep. 30, 2013 | Dec. 31, 2012 |
In Thousands, unless otherwise specified |
Property, Plant and Equipment [Line Items] | ' | | ' | |
Construction in progress | ' | | $269 | |
Property, plant, equipment, mine development and land, gross | 8,726 | | 9,804 | |
Less - accumulated depreciation | -1,168 | | -926 | |
Property, plant, equipment, mine development, land and construction in progress, net | 7,558 | | 8,878 | |
Land [Member] | ' | | ' | |
Property, Plant and Equipment [Line Items] | ' | | ' | |
Property, plant, equipment, mine development and land, gross | 20 | | 20 | |
La Currita [Member] | ' | | ' | |
Property, Plant and Equipment [Line Items] | ' | | ' | |
Property, plant, equipment, mine development and land, gross | ' | [1] | 1,253 | [1] |
Pilar [Member] | ' | | ' | |
Property, Plant and Equipment [Line Items] | ' | | ' | |
Property, plant, equipment, mine development and land, gross | 728 | | 728 | |
Don Roman [Member] | ' | | ' | |
Property, Plant and Equipment [Line Items] | ' | | ' | |
Property, plant, equipment, mine development and land, gross | 522 | | 522 | |
Las Nuvias [Member] | ' | | ' | |
Property, Plant and Equipment [Line Items] | ' | | ' | |
Property, plant, equipment, mine development and land, gross | 100 | | 100 | |
Centenario [Member] | ' | | ' | |
Property, Plant and Equipment [Line Items] | ' | | ' | |
Property, plant, equipment, mine development and land, gross | 636 | | 636 | |
La Verde [Member] | ' | | ' | |
Property, Plant and Equipment [Line Items] | ' | | ' | |
Property, plant, equipment, mine development and land, gross | 60 | | 60 | |
La Palma [Member] | ' | | ' | |
Property, Plant and Equipment [Line Items] | ' | | ' | |
Property, plant, equipment, mine development and land, gross | 80 | | 80 | |
Champinon [Member] | ' | | ' | |
Property, Plant and Equipment [Line Items] | ' | | ' | |
Property, plant, equipment, mine development and land, gross | ' | [2] | 2,154 | [2] |
Dixie Mining District [Member] | ' | | ' | |
Property, Plant and Equipment [Line Items] | ' | | ' | |
Property, plant, equipment, mine development and land, gross | 650 | [3] | ' | [3] |
Picacho Groupings [Member] | ' | | ' | |
Property, Plant and Equipment [Line Items] | ' | | ' | |
Property, plant, equipment, mine development and land, gross | 1,571 | | ' | |
Mining Concessions [Member] | ' | | ' | |
Property, Plant and Equipment [Line Items] | ' | | ' | |
Property, plant, equipment, mine development and land, gross | 4,347 | | 5,533 | |
Property, Plant and Equipment [Member] | ' | | ' | |
Property, Plant and Equipment [Line Items] | ' | | ' | |
Property, plant, equipment, mine development and land, gross | $4,359 | | $3,982 | |
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[1] | On April 22, 2013, the Company, through its subsidiary, Amermin, sold its La Currita mining concessions for $2,250,000, plus the corresponding value added tax, for a total of $2,610,000. As of September 30, 2013, the Company received $2,200,000, plus the corresponding value added tax. The Company recorded a gain of $946,560 on the sale of the mining concession. |
[2] | In September 2011, the Company leased the Mina El Champinon Iron Ore Project ("Champinon") in exchange for royalty payments based on production. From September 2011 to April 2012, the Company paid $235,000, plus $38,000 in value-added taxes in advances against royalty payments. In May, 2012, the Company terminated the lease agreement for Champinon and entered into a new agreement to acquire the Iron Ore Project for an effective purchase price of $2,175,000, plus $348,000 in value-added taxes. The advances against royalty payments made before the lease agreement was terminated were applied against the effective purchase of the Iron Ore Project.In May 2012, the Company purchased technical data pertaining to Champinon from the former owner for 500,000 shares of Tara Minerals' common stock, valued at $430,000. On March 15, 2013, a Settlement Agreement and Release ("Agreement") was entered into by and among the Company, AMM, Jeffrey Holt, Tom Claridge, Steve Eady, Carnegie Mining and Exploration, Inc. ("CMEI"), CME Operations, LLC ("CME")(CMEI and CME, referred to as "Carnegie"), Harsco Corporation, and Pittsburgh Mineral & Environmental Technology, Inc. In exchange for Carnegie's acknowledgement that it has no rights under a previously granted option on the Don Roman property further described below, AMM assigned its Champinon mining rights purchase contract, including all related obligations and acquisition payments, to Plathio Trading Mexico, SA de CV, Carnegie's Mexican subsidiary, and the Company agreed to issue to Carnegie 500,000 restricted shares of the Company's common stock, which may not be sold until the earlier of: (i) the Company's shares reaching a minimum trading price of $1.00 per share; or (ii) two years from the date of the Agreement. Under the transfer agreement for the Champinon property, AMM retains mining and beneficial rights to known silver, zinc, and led vein structure present on the Champinon concession. On March 22, 2013, the 500,000 restricted shares were issued. The Agreement confirms Carnegie's acknowledgement of the Company's 100% ownership of the Don Roman property.Per the Agreement dated March 15, 2013, the Company retained ownership of 14 hectares of the Champinon mining concession which the Company valued at $203,000. As of September 2013, the Company was notified of a default of the purchase contract by non-performance of Carnegie; the Company concluded that at this time the probability of retaining claim on the 14 hectares of the Champinon mining concession is remote and therefore removed the mining concession from its books and recognized it as an additional loss on the Agreement. The Company recognized a total loss of $1,065,000 on the Agreement mentioned above. |
[3] | In May 2013, the Company acquired the Dixie Mining District, located in Idaho, from an independent third party for $400,000. The purchase price was paid in full in 2013. In September 2013 the Company exercised its option to acquire 20 additional acres of unpatented mining claims to add to the Dixie Mining District, for an effective purchase price of $250,000. To date, the land package consists of 6,741 acres consisting of both patented and unpatented mining claims. The independent third party shall receive royalties upon all ores, mineral-bearing rock and other deposits extracted and shipped or milled, treated, and sold from the property in the amount of 3% of the net smelter or mill returns earned from the property prior to December 31, 2014. The royalty agreement provides that the payment of the royalty shall terminate upon the independent third party receiving $558,160. If that amount is not paid as of December 31, 2014, the Company is required to pay the difference. No royalty shall be owed to the independent third party if mining on the property is not economically feasible. As of September 30, 2013, no royalty payments have been paid. |