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Significant Accounting Policies and US GAAP (Policies) | 6 Months Ended
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Jun. 30, 2012
Significant Accounting Policies and U.S. GAAP [Abstract] |
Consolidation | Principles of Consolidation The consolidated interim financial statements of Vista consolidate the accounts of entities in which we have a controlling financial interest. All intercompany balances and transactions have been eliminated in the consolidated financial statements. Our subsidiaries and percentage ownership in these entities are:
|  | Ownership |
Vista Gold U.S., Inc. and its subsidiary |  |  | 100 | %
Vista California, LLC |  |  | 100 | %
Granges Inc. |  |  | 100 | %
Desarrollos Zapal Holding Corp. and its subsidiaries |  |  | 100 | %
Desarrollos Zapal S.A. de C.V. (1% owned by Granges Inc.) and its subsidiaries (a) |  |  | 99 | %
Servicios Administrativos MPA S.A. de C.V. (1% owned by Granges Inc.) |  |  | 99 | %
Servicios Industriales MPA S.A. de C.V. (1% owned by Granges Inc.) |  |  | 99 | %
Vista Gold (Barbados) Corp. and its wholly-owned subsidiary |  |  | 100 | %
Salu Siwa Pty. Ltd and its subsidiary |  |  | 100 | %
PT Masmindo Dwi Area (1% owned by Vista Gold (Barbados) Corp.) |  |  | 99 | %
Vista Minerals (Barbados) Corp. and its wholly-owned subsidiary |  |  | 100 | %
Vista Gold Australia Pty Ltd. |  |  | 100 | %
Minera Gold Stake Holdings Corp. (name changed from Vitliq Holdings Corp. effective January 23, 2012) |  |  | 100 | %
Minera Gold Stake S.A. de C.V. (name changed from Vitliq S.A. de C.V. effective January 23, 2012) (1% owned by Granges Inc.) |  |  | 99 | %
| (a) | On February 7, 2012, we entered into an earn-in right agreement (the "Earn-in Right Agreement") with Invecture Group, S.A de C.V. ("Invecture") whereby Invecture has the right, exercisable by February 7, 2014 (subject to extension) (the "Earn-in Right Period"), to earn a 62.5% interest in the Concordia gold project, which is owned through our wholly-owned, Mexican subsidiary, Desasarrollos Zapal, S.A. de C.V. ("DZ Mexico"). During the Earn-in Right Period and subject to the terms of the Earn-in Right Agreement, Vista holds 37.5% of the DZ Mexico shareholder voting rights. The remaining 62.5% of the DZ Mexico shareholder voting rights are held in a trust that is instructed by representatives of Vista and Invecture. Upon Invecture's exercise of the earn-in right, Vista will continue to hold a 37.5% interest in DZ Mexico and the Concordia gold project. See Note 5 for further discussion.
Use of Estimates | Use of Estimates The preparation of consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the consolidated financial statements and the reported amount of revenues and expenses during the reporting period. Significant areas requiring the use of estimates include capital costs of projects, mine closure and reclamation obligations, useful lives for asset depreciation purposes, impairment of mineral properties, deferred income taxes, valuation of investments and the calculation of stock-based compensation. Actual results could differ from these estimates.
Cash and Cash Equivalents | Cash and Cash Equivalents Cash and cash equivalents include cash on hand, demand balances held with banks and certificates of deposit all with maturities of three months or less when purchased.
Marketable Securities | Marketable Securities We classify marketable securities as available-for-sale, as the Company has the ability and intent to hold these securities for the foreseeable future. Accordingly, these securities are carried at fair value with unrealized gains and losses being reported in other comprehensive income until such time that the securities are disposed of or become impaired. At that time, any gains or losses will be realized and reported in our Consolidated Statements of Income/(Loss) and Comprehensive Income/(Loss). We use the specific identification method for determining carrying value in computing realized gains and losses on sales of investment securities. We evaluate investments in a loss position to determine if such a loss is other-than-temporary. If so, such loss will be recognized and reported during that period.
Mineral Properties | Mineral Properties In general, costs to acquire mineral properties are capitalized when incurred and mineral property exploration costs are expensed as incurred. When we determine that a mineral property can be economically developed based on proven and probable reserves, in accordance with U.S. GAAP, development costs will be capitalized as incurred. Once production has commenced, capitalized costs will be depleted using the units-of-production method over the estimated life of the proven and probable reserves. If mineral properties are subsequently abandoned or impaired, any capitalized costs will be charged to the Consolidated Statements of Income/(Loss) and Comprehensive Income/(Loss) in that period. We assess the carrying cost of our mineral properties for impairment whenever information or circumstances indicate the potential for impairment. Such evaluations compare estimated future net cash flows with our carrying costs and future obligations on an undiscounted basis. If it is determined that the future undiscounted cash flows are less than the carrying value of the property, a write down to the estimated fair value is charged to the Consolidated Statements of Income/(Loss) and Comprehensive Income/(Loss) for the period. Where estimates of future net cash flows are not available and where other conditions suggest impairment, management assesses if the carrying value can be recovered. Proceeds received under option agreements and/or earn-in agreements are recorded as a cost recovery against the carrying value of the underlying project until the carrying value is reduced to zero. Any proceeds received in excess of the carrying value of the project are recorded as a realized gain in the Consolidated Statements of Income/(Loss) and Comprehensive Income/(Loss).
Plant and Equipment | Plant and Equipment Plant and equipment are recorded at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, ranging primarily from three to five years. Significant expenditures that increase the life of an asset, including interest on qualifying assets, are capitalized and depreciated over the remaining estimated useful life of the asset. Upon sale or retirement of assets, the costs and related accumulated depreciation or amortization are eliminated from the respective accounts and any resulting gains or losses are reflected in the Consolidated Statements of Income/(Loss) and Comprehensive Income/(Loss).
Asset Retirement Obligation and Closure Costs | Asset Retirement Obligation and Closure Costs The fair value of a liability for our legal obligations associated with the retirement of long-lived assets is recognized in the period in which it is incurred. The associated asset retirement costs are capitalized as part of the carrying amount of the long-lived asset unless the asset has been previously written off, in which case the amount is expensed. The liability will be adjusted for changes in the expected amounts and timing of cash flows required to discharge the liability and accreted to the full value over time through periodic charges to the Consolidated Statements of Income/(Loss) and Comprehensive Income/(Loss).
Warrants [Policy Text Block] | Warrants Warrants and compensation options issued are recorded at fair value.
Stock-Based Compensation | Stock-Based Compensation We record compensation expense on the granting of all stock-based compensation awards, including stock options grants, restricted stock units grants and restricted stock awards grants, calculated using the fair-value method. We use the Hull-White Trinomial method of determining the fair value of the stock option on the date of the grant. When an option is granted, the fair value of the immediately vested portion is expensed and included in stock-based compensation within shareholders' equity. As options vest, the fair value is amortized using the straight-line method over the vesting period and expensed on a monthly basis. When an option is exercised, the grant-date fair value of the options is transferred to common stock. When options are cancelled, the vested fair-value balance of the stock options is transferred to additional paid-in capital. When stock options are forfeited prior to becoming fully vested, any expense previously recorded is reversed through income. When options expire, the related fair value is transferred to additional paid-in capital. The fair value of restricted stock units and restricted stock awards on the date of grant is amortized using the straight-line method over the vesting period and expensed on a monthly basis. Certain restricted stock units vest upon the achievement of specified performance and market criteria, but not less than one year. On a quarterly basis, management, using the best information available through that time, assesses the probability of achieving those performance and market criteria in determining the appropriate vesting period for the purpose of recording the expense associated with those restricted stock units. On the date of vesting, the grant-date fair value of the restricted stock units or restricted stock awards is transferred to common stock. When restricted stock units or restricted stock awards are forfeited prior to vesting, any expense previously recorded is reversed through income.
Foreign Currency Exchange Gains or Losses | Foreign Currency Exchange Gains or Losses Our functional currency is the U.S. dollar. All of our foreign subsidiaries are direct and integral components of Vista and are dependent upon the economic environment of our functional currency. Therefore, the functional currency of our foreign entities is considered to be the U.S. dollar and accordingly, translation gains and losses are reported in the Consolidated Statements of Income/(Loss) and Comprehensive Income/(Loss) for that period. Assets and liabilities of these foreign operations are translated using period-end exchange rates and revenues and expenses are translated using average exchange rates during each period.
Income Taxes | Income Taxes We provide for income taxes using the liability method of tax allocation. Under this method, deferred income tax assets and liabilities are determined based on deductible or taxable temporary differences between financial statement values and tax values of assets and liabilities using enacted income tax rates in effect for the year in which the differences are expected to reverse. Deferred tax is recognized as income or an expense and included in the profit or loss for the period, except when it arises from a transaction that is recognized directly in equity, in which case the deferred tax is also recognized directly in equity, or when it arises from a business combination in which case the deferred tax is included in the resulting goodwill. We establish a valuation allowance against the future income tax assets if, based on available information, it is more likely than not that all of the assets will not be realized.
Uncertainty in Income Tax Positions | Uncertainty in Income Tax Positions The Company recognizes tax benefits from uncertain tax positions only if it is at least more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the financial statements from such a position are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon settlement with the taxing authorities. The Company records the related interest expense and penalties, if any, as tax expense in the tax provision.
Net Income/(Loss) Per Share | Net Income/(Loss) Per Share Basic income/(loss) per share amounts are calculated by using the weighted average number of common shares outstanding during the period. Diluted income/(loss) per share amounts reflect the potential dilution that could occur if securities or other contracts that may require the issuance of common shares in the future were converted, unless their inclusion would be anti-dilutive.

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- Definition Disclosure of accounting policy for determining amounts to accrue and charge against earnings so as to satisfy legal obligations associated with the retirement (through sale, abandonment, recycling, or disposal in some other manner) of a tangible long-lived asset that result from the acquisition, construction, or development and (or) the normal operation of a long-lived asset. This accounting policy disclosure excludes obligations arising 1) in connection with leased property, whether imposed by a lease agreement or by a party other than the lessor, that meet the definition of either minimum lease payments or contingent rentals; 2) solely from a plan to sell or otherwise dispose of a long-lived asset and 3) from certain environmental remediation liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 47 -Paragraph 3 -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 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 2, 3, 11, 13, 14, 15, 22 -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 Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 203 -Paragraph 02-03 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 8, 9, 10 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Technical Practice Aid (TPA) -Number 2110 -Paragraph 6 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4273-108586 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2122427 + Details
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- Definition Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. 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- Definition Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 17 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32809-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 20 -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 Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32247-109318 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 4 -Paragraph 11 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32840-109319 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 6-34, 43, 47, 49 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32280-109318 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 740 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6491622&loc=d3e9504-115650 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -URI http://asc.fasb.org/subtopic&trid=2144749 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2144681 + Details
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