• Copperstone Economic Sensitivities at various Gold Prices:
    Gold Price Case Gold Price (US$/Oz) IRR (%) Undiscounted pre-tax Cash Flow (US$) Net Cumulative After-Tax Cash Flow (US$) Net Present Value After-Tax (US$) (Discounted)
    Very Low $650 17.0% $7,380,073 $7,380,073  $4,488,124
    Low $850 74.3% $50,162,532 $47,461,378 $37,194,541
    Base Case $962 96.3% $74,169,910 $64,763,463 $51,291,204
    Spot $1104 120.5% $104,496,256 $85,434,230 $68,089,302
    High $1250 145.1% $135,727,452 $106,035,800 $84,874,376
     Very High $1400 170.4% $167,814,296 $126,868,118 $101,878,924
    IRR of $1,400 gold is 170%.http://www.americanbonanza.com/s/Copperstone.asp?ReportID=555292&_Type=Copperstone&_Title=2010-Feasibility-Study-Highlights
  • Significant expansion potential identified: South Pit Gold Zone and Reserves area open to expansion.

The 2010 Feasibility Study was published on February 2 2010 and revised on January 10 2011.