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Mineral Properties (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 119 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  | 6 Months Ended |  | 12 Months Ended |  | 6 Months Ended | 12 Months Ended |  | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2012 Long Valley, United States [Member] | Feb. 29, 2012 Concordia, Mexico [Member] | Aug. 31, 2003 Concordia, Mexico [Member] | Aug. 31, 2002 Concordia, Mexico [Member] | Jun. 30, 2012 Concordia, Mexico [Member] | Dec. 31, 2002 Concordia, Mexico [Member] | Feb. 07, 2012 Concordia, Mexico [Member] | Sep. 30, 2011 Concordia, Mexico [Member] | Jul. 31, 2002 Concordia, Mexico [Member] | Jun. 30, 2012 Concordia, Mexico [Member] Earn in Right Agreement [Member] | Feb. 07, 2012 Concordia, Mexico [Member] Earn in Right Agreement [Member] | Jul. 31, 2002 Concordia, Mexico [Member] Milestone Payment [Member] | Jun. 30, 2012 Guadalupe de los Reyes, Mexico [Member] | Jun. 30, 2012 Awak Mas, Indonesia [Member] | Dec. 31, 2011 Awak Mas, Indonesia [Member] | Dec. 31, 2009 Awak Mas, Indonesia [Member] Joint Venture Agreement [Member] | Apr. 30, 2005 Awak Mas, Indonesia [Member] Joint Venture Agreement [Member] | Jun. 30, 2012 Awak Mas, Indonesia [Member] Additional Option Agreement [Member] | Dec. 31, 2011 Awak Mas, Indonesia [Member] Additional Option Agreement [Member] | Jun. 30, 2011 Awak Mas, Indonesia [Member] Additional Option Agreement [Member] | Jun. 30, 2012 Mt. Todd, Australia [Member]
Mineral Properties Activity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mineral properties net |  |  | $ 16,517 |  |  | $ 750 |  |  |  | $ 10,303 |  |  |  |  |  |  |  | $ 2,752 | $ 566 |  |  |  |  |  |  | $ 2,146
Cost recovery |  |  | (2,566) |  |  | 0 |  |  |  | (2,000) |  |  |  |  |  |  |  | 0 | (566) |  |  |  |  |  |  | 0
Mineral properties net | 13,951 |  | 13,951 |  | 13,951 | 750 |  |  |  | 8,303 |  |  |  |  |  |  |  | 2,752 | 0 |  |  |  |  |  |  | 2,146
Acquisition costs |  |  |  |  |  |  |  | 320 | 786 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500 | 2,500 |  |
Percentage of equity interest acquired (in hundredths) |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |
Cash paid for acquisition |  |  |  |  |  |  |  |  |  |  |  |  | 1,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity units issued or issuable (in shares) |  |  |  |  |  |  |  |  |  |  | 303,030 |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |
Fair value of equity units issued or issuable |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,212 |  |  |  |  |  |  |  |  |  |  |  |
Additional cash paid for acquisition |  |  |  |  |  |  |  | 320 | 665 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount due upon achievement of milestone |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 635 |  |  |  |  |  |  |  |  |
Payment for interest in project under the earn in agreement |  |  |  |  |  |  | 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage interest to be earned by third party investor under agreement, before adjustment (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  | 60.00% |  |  |  |  |
Adjusted percentage interest to be earned under agreement (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62.50% |  |  |  | 80.00% |  |  |  |  |  |  |
Voting rights in subsidiary held solely by reporting entity (in hundredths) |  |  |  |  |  |  |  |  |  | 37.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting rights in subsidiary that are held in trust (in hundredths) |  |  |  |  |  |  |  |  |  | 62.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional percentage interest to be earned under earn in right agreement (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |
Additional payment for interest in project under earn-in agreement |  |  |  |  |  |  |  |  |  |  |  | 20,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of option to acquire mill equipment |  |  |  |  |  |  |  |  |  |  |  | 16,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500 |  |  |  |
Additional amount of expenditure on project for earn-in right |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000 |  |  |  |  |
Additional shares issuable on initial public offering (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |
Length of drilling program (in meters) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000 |
Gain on disposal of mineral property, net | 0 | 77,807 | 934 | 77,807 | 80,598 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 934 |  |  |
Restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 93 | $ 134 |  |  |  |  |  |

X
- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=21918352&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 3(ii)(A) -Article 4 + Details
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- Definition Amount of potential cash payments that could result from the contingent consideration arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Maximum number of shares issuable under the contingent consideration arrangement in a business combination. + References No definition available. + Details
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- Definition Amount of cash paid to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The acquisition-date fair value of the equity interests of the acquirer, including the number of instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 39 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 88-16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f(4) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Percentage of voting equity interests acquired in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Mineral properties, net of adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Return of or reimbursements received in relation to direct costs and expenses previously paid or incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 80 -Subparagraph Exhibit 4-8, 3 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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- Definition Additional amount of expenditure required to be made on the project for the earn-in right within a specified period of time. + References No definition available. + Details
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- Definition Additional non-refundable payment required to be made in exchange for the right to earn a specified interest percentage. + References No definition available. + Details
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- Definition Additional amount of cash paid to acquire the entity during the period. + References No definition available. + Details
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- Definition The gains (losses) included in results of operations resulting from the sale or disposal of mineral property, net of transaction costs, which do not qualify for treatment as discontinued operations. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property. + References No definition available. + Details
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- Definition The specified number of meters under the drilling program required to be carried out as a condition to earn additional percentage of interest in a project as part of the additional option agreement. + References No definition available. + Details
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- Details
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- Definition Cash outflows relating to mineral properties options payments. + References No definition available. + Details
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- Definition Value of the option granted to Invecture to cause DZ Mexico to acquire the mill equipment. + References No definition available. + Details
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- Definition Non-refundable payment in exchange for the right to earn a specified interest percentage. + References No definition available. + Details
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- Definition Adjusted percentage of interest to be earned by a third party investor under an agreement for a certain project. + References No definition available. + Details
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- Definition Percentage of interest to be earned by a third party investor under an agreement for a certain project, before adjustment. + References No definition available. + Details
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- Definition Additional percentage of interest to be earned under an earn-in right agreement for a certain project. + References No definition available. + Details
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- Definition The equity voting rights in the subsidiary that are held solely by the reporting entity. + References No definition available. + Details
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- Definition The equity voting rights in the subsidiary that are held in a trust that is instructed by representatives of the reporting entity and a third party investor. + References No definition available. + Details
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