|
Ore
<br />Mining Phase
<br />Through
<br />Amendment No. 8
<br />Amendment No. 9
<br />(MLE
<br />MLE2
<br />Totals through
<br />MLE2
<br />Surface Ore (MMt)
<br />180,000,000
<br />410,000,000
<br />209,000,000
<br />619,000,000
<br />Sulfur (total) ( %)
<br />1.40
<br />1.35
<br />1 44
<br />66,173,596
<br />Acid Generating Potential (t/kt)
<br />43.56
<br />42.12
<br />45.00
<br />28,029,925
<br />Acid Generating Potential (t)
<br />7,840,789
<br />4,633,200
<br />12,104,966
<br />24,578,955
<br />Carbon (total) ( %)
<br />0.25
<br />0.26
<br />0.23
<br />Acid Neutralizing Potential (t/Kt)
<br />20.58
<br />21 69
<br />19.48
<br />Acid Neutralizing Potential (t)
<br />3,705,160
<br />2,385,812
<br />5,239,917
<br />11,330,889
<br />Net Neutralizing Potential (t)
<br />- 4,135,629
<br />- 2,247,388
<br />- 6,865,049
<br />- 13,248,066
<br />Higher Grade Ore
<br />Mining Phase
<br />Through
<br />Amendment No. 8
<br />Amendment No. 9
<br />(MLE)
<br />MLE2
<br />Totals through
<br />MLE2
<br />Higher Grade Ore (MMt)
<br />360,000,000
<br />665,000,000
<br />11,000,000
<br />11,000,000
<br />Sulfur (total) ( %)
<br />1.24
<br />1.19
<br />1.78
<br />66,173,596
<br />Acid Generating Potential (t/kt)
<br />38.61
<br />37 13
<br />55.57
<br />28,029,925
<br />Acid Generating Potential (t)
<br />13,899,877
<br />9,282,000
<br />611,232
<br />611,232
<br />Carbon (total) ( %)
<br />0.19
<br />0.18
<br />0 41
<br />Acid Neutralizing Potential (t/Kt)
<br />15.49
<br />15.02
<br />25.72
<br />Acid Neutralizing Potential (t)
<br />5,575,718
<br />3,753,900
<br />282,908
<br />282,908
<br />Net Neutralizing Potential (t)
<br />- 8,324,160
<br />- 5,528,100
<br />- 328,325
<br />- 328,325
<br />Overburden
<br />Mining Phase
<br />Through
<br />Amendment No. 8
<br />Amendment No. 9
<br />(MLE)
<br />MLE2
<br />Totals through
<br />MLE2
<br />Overburden (MMt)
<br />360,000,000
<br />665,000,000
<br />310,000,000
<br />975,000,000
<br />Sulfur (total) ( %)
<br />1.24
<br />1.19
<br />1.29
<br />66,173,596
<br />Acid Generating Potential (t/kt)
<br />38.61
<br />37 13
<br />40 09
<br />28,029,925
<br />Acid Generating Potential (t)
<br />13,899,877
<br />9,282,000
<br />17,801,532
<br />40,983,409
<br />Carbon (total) ( %)
<br />0.19
<br />0.18
<br />0.19
<br />Acid Neutralizing Potential (t/Kt)
<br />15.49
<br />15.02
<br />15.96
<br />Acid Neutralizing Potential (t)
<br />5,575,718
<br />3,753,900
<br />7,086,511
<br />16,416,128
<br />Net Neutralizing Potential (t)
<br />- 8,324,160
<br />- 5,528,100
<br />- 10,715,021
<br />- 24,567,281
<br />Total Material Mined
<br />Mining Phase
<br />Through
<br />Amendment No. 8
<br />Amendment No. 9
<br />(MLE)
<br />MLE2
<br />Totals through
<br />MLE -2
<br />Total (MMt)
<br />540,000,000
<br />1,075,000,000
<br />530,000,000
<br />1,605,000,000
<br />Acid Generating Potential (t)
<br />21,740,666
<br />13,915,200
<br />30,517,730
<br />66,173,596
<br />Acid Neutralizing Potential (t)
<br />9,280,878
<br />6,139,712
<br />12,609,335
<br />28,029,925
<br />Net Neutralizing Potential (t)
<br />- 12,459,788
<br />- 7,775,488
<br />- 17,908,395
<br />- 38,143,671
<br />Cresson Project Hvdroaeochemist
<br />Table 5 - Acid -Base Accounting
<br />AdrianBrown
<br />Notes:
<br />1. S and C concentrations through Amendment No. 9 estimated from later data.
<br />2 Assumes all sulfur reacts as pyrite, and all carbon is available as calcium carbonate.
<br />3. All potentials are expressed in equivalent calcium carbonate.
<br />1385L.20120125
<br />29
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