The cutoff grades used to determine the above mineral resources were 2 grams per ton AuEQ for sulfide mineralization and 3 grams per ton AuEQ for oxide mineralization since the potential costs to extract oxide material may be higher than the cost to process sulfide mineralization.  Approximately 10% of the resource is oxide mineralization and therefore only a minor part of the resource.
 
2009 Tahuehueto Resource Measured & Indicated
Cut Off AuEQ/t Tonnes g Au/t Oz. Au g Ag/t Oz. Ag Cu% lbs. Cu Pb% lbs. Pb Zn% lbs. Zn
2 7,377,000 2.10 498,000 34.97 8,294,000 0.28 45,339,000 1.06 172,738,000 2.01 326,653,000
3 5,061,370 2.67 434,813 37.90 6,167,651 0.30 33,376,732 1.14 126,968,191 2.13 237,563,226
4 3,489,909 3.55 398,332 44.27 4,967,055 0.36 27,770,598 1.32 101,664,944 2.51 193,388,120
5 2,533,385 4.37 355,868 48.40 3,942,374 0.41 22,931,883 1.46 81,541,606 2.82 157,349,555
6 1,864,631 5.37 322,066 53.89 3,230,753 0.47 19,384,355 1.63 67,092,040 3.11 127,837,139
7 1,359,829 6.68 292,052 60.63 2,650,700 0.54 16,171,209 1.80 54,007,953 3.49 104,487,816
8 1,065,009 7.74 264,863 63.52 2,174,835 0.57 13,436,997 1.85 43,521,708 3.63 85,236,984
9 809,426 9.27 241,285 68.68 1,787,198 0.63 11,279,678 1.96 35,038,616 3.92 69,919,666
10 626,405 10.56 212,620 69.73 1,404,278 0.66 9,106,680 2.09 28,887,456 4.16 57,431,837
 
2009 Tahuehueto Resource - Inferred
Cut Off AuEQ/t Tonnes g Au/t Oz. Au g Ag/t Oz. Ag Cu% lbs. Cu Pb% lbs. Pb Zn% lbs. Zn
2 4,868,000 1.06   31.77   &0.23   1.23   2.26  
3 2,945,828 1.38   34.53   0.26   1.43   2.68  
4 1,945,005 1.72   38.07   0.30   1.56   3.11  
5 1,173,344 2.19   46.93   0.38   1.83   3.32  
6 685,997 2.78   50.78   0.43   1.98   3.60  
7 373,791 3.98   53.69   0.47   1.83   3.86  
8 264,775 4.61   56.75   0.46   1.87   4.12  
9 165,165 5.48   50.86   0.42   1.90   4.44  
10 89,157 6.86   64.38   0.59   1.85   4.30  
 
 
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