Deferred Taxes	6 Months Ended
Jun. 30, 2011
Deferred Taxes Disclosure [Abstract]
Deferred Taxes	8. Deferred Taxes As of December 31, 2010, our deferred tax assets were fully reserved with a related valuation allowance. On April 6, 2011, we completed the Combination with Midas Gold Inc. that was a tax-free reorganization for U.S. tax purposes. However, upon completion of the Combination, Vista US received Midas Gold Shares with a fair value of $78,872. The estimated deferred tax liability of $29,675 exceeded the valuation allowance of $6,086 for Vista US. Therefore, the valuation allowance against Vista US's deferred tax asset was released upon receipt of the Midas Gold Shares, and the corresponding deferred tax asset of $6,086 has been offset against the deferred tax liability of $29,675 and has been recorded in the Consolidated Balance Sheet at June 30, 2011. The tax calculation is based on an effective rate of 38.01% (US Federal – 35% and state – 3.01%).

Deferred Taxes

6 Months Ended

Jun. 30, 2011

Deferred Taxes Disclosure [Abstract]

8. Deferred Taxes

As of December 31, 2010, our deferred tax assets were fully reserved with a related valuation allowance. On April 6, 2011, we completed the Combination with Midas Gold Inc. that was a tax-free reorganization for U.S. tax purposes. However, upon completion of the Combination, Vista US received Midas Gold Shares with a fair value of $78,872. The estimated deferred tax liability of $29,675 exceeded the valuation allowance of $6,086 for Vista US. Therefore, the valuation allowance against Vista US's deferred tax asset was released upon receipt of the Midas Gold Shares, and the corresponding deferred tax asset of $6,086 has been offset against the deferred tax liability of $29,675 and has been recorded in the Consolidated Balance Sheet at June 30, 2011. The tax calculation is based on an effective rate of 38.01% (US Federal – 35% and state – 3.01%).