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Amayapampa Interest
 3 Months Ended
Mar. 31, 2012
Amayapampa Interest [Abstract]  
Amayapampa Interest
3. Amayapampa Interest

On April 7, 2008, we entered into an agreement to dispose of our wholly-owned subsidiary Vista Gold (Antigua) Corp. ("Vista Gold Antigua") to Republic Gold Limited ("Republic"). Vista Gold Antigua indirectly held our interest in the Amayapampa gold project in Bolivia. Under the terms of the transaction, Republic agreed to pay to us a total amount of $3,000 in three payments of $1,000. The first of these payments will be due and payable upon the start of commercial production (as defined in the purchase and sale agreement) at the Amayapampa gold project followed by $1,000 payments on each of the first and second anniversaries of the start of commercial production.  In addition, Republic agreed to pay to us a net smelter return royalty ("NSR") on the gold produced by or on behalf of Republic from the Amayapampa gold project in varying percentages depending on the price of gold per ounce. When the price of gold is between $500.01 and $650.00 per ounce, a 2% NSR is payable; when the price of gold is between $650.01 and $750.00 per ounce, a 3% NSR is payable; and when the price of gold is $750.01 per ounce and above, an NSR of 3.5% is payable. The NSR is capped at 720,000 gold equivalent ounces, and no NSR payments are due to us if the gold price is below $500 per ounce.  To date, no amount has been paid or payable to the Company under this agreement.

The Amayapampa interest is considered a financial instrument and as such has been accounted for at its fair value of $4,813 based on probability-weighted cash flow scenarios and assumptions, including future gold prices, estimated gold production and the timing of commencement of commercial production.  See Note 14 below for further discussion.

On February 3, 2012, Republic announced that it has suspended operation in Bolivia at the Amayapampa gold project pending regulatory and policy certainty specifically related to the nationalization of mining assets and the implications of the Bolivian Draft Mining Code.  Republic stated that it will assess its options in Bolivia, which may include the sale of its assets.  As of March 31, 2012, we evaluated the carrying amount of the Amayapampa interest based upon the probability-weighted cash flows taking into account a higher probability that the project may never go into production or that commercial production may be delayed due to the political risks described above.  Our evaluation also considered recent trends in future gold prices and updated gold production estimates published by an independent third party consulting firm in January 2011.  Based upon the upward trend in long-term gold prices and higher estimated gold production specified in third party technical reports, we concluded that there was no change in fair value as of March 31, 2012.