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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 119 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012
Cash flows from operating activities: |  |  |
Net income/(loss) for the period | $ (41,728) | $ 43,887 | $ (66,382)
Adjustments to reconcile income/(loss) for the period to net cash used in operations: |  |  |
Depreciation and amortization | 258 | 160 | 1,598
Stock-based compensation | 1,992 | 948 | 9,052
Gain on disposal of marketable securities | (143) | (447) | (7,945)
Loss on extinguishment of convertible notes | 0 | 0 | 1,218
Accrued interest and accretion of interest | 0 | 120 | 4,096
Gain on disposal of mineral property | (934) | (78,072) | (80,867)
Common stock issued for interest | 0 | 0 | 1,841
Unrealized loss on long-term investments | 42,316 | 0 | 4,969
Write down of marketable securities | 0 | 0 | 1,007
Deferred tax (benefit)/expense | (16,201) | 23,589 | 19,321
Other non-cash items | 0 | 0 | 1,304
Change in working capital account items: |  |  |
Other current assets | (538) | 41 | (1,977)
Accrued interest payable | 0 | (505) | (8,090)
Accounts payable, accrued liabilities and other | (227) | 288 | 688
Net cash used in operating activities | (15,205) | (9,991) | (120,167)
Cash flows from investing activities: |  |  |
Purchases of marketable securities | (135) | (128) | (1,823)
Proceeds from sales of marketable securities | 230 | 576 | 11,279
Acquisition of long-term investments | (45) | (3,632) | (3,677)
Additions to mineral property | 0 | (50) | (7,647)
Additions to plant and equipment | (589) | (90) | (21,032)
Change in restricted cash | 41 | 0 | 41
Proceeds from additional option agreement | 1,500 | 0 | 2,500
Proceeds from earn-in right agreement | 2,000 | 0 | 2,000
Proceeds on disposal of mineral property | 0 | 0 | 188
Proceeds on disposal of plant and equipment | 0 | 0 | 52
Cash transferred to Allied Nevada Gold Corp., net of receivable | 0 | 0 | (24,517)
Net cash (used in)/provided by investing activities | 3,002 | (3,324) | (42,636)
Cash flows from financing activities: |  |  |
Net proceeds from equity financings | 0 | 28,988 | 137,070
Repayment of convertible notes | 0 | (23,000) | (26,108)
Proceeds from exercise of warrants | 1,833 | 48 | 41,162
Proceeds from exercise of stock options | 0 | 432 | 3,974
Issuance of convertible notes | 0 | 0 | 28,345
Cash paid in lieu of capital stock issuances | 0 | 0 | (107)
Transaction costs | 0 | 0 | (1,841)
Net cash provided by financing activities | 1,833 | 6,468 | 182,495
Increase/(decrease) in cash and cash equivalents | (10,370) | (6,847) | 19,692
Decrease in cash and cash equivalents - discontinued operations | 0 | 0 | (12,863)
Net increase/(decrease) in cash and cash equivalents | (10,370) | (6,847) | 6,829
Cash and cash equivalents, beginning of period | 17,873 | 39,838 | 674
Cash and cash equivalents, end of period | $ 7,503 | $ 32,991 | $ 7,503

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Period Type: | duration

X
- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This amount represents increase in accrued interest as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cash paid by the Company on behalf of the grantee for withholding taxes that were due upon the exercise of restricted stock units. Such cash payments were made in lieu of issuing common shares of the Company's capital stock. + References No definition available. + Details
Name: | vgz_CashPaidInLieuOfCapitalStockIssuances
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The gains (losses) included in results of operations resulting from the sale or disposal of mineral property, 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
Name: | vgz_GainLossOnDispositionOfMineralProperty
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from additional agreement between two parties that provides one of the parties with the right but not the obligation to buy, sell, or obtain a specific asset at an agreed price at some time in the future. + References No definition available. + Details
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Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from additional agreement between two parties that provides one of the parties with the right but not the obligation to buy, sell, or obtain a specific asset at an agreed price at some time in the future. + References No definition available. + Details
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Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period. + References No definition available. + Details
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Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration