2012-02-28_REVISION - M1980244 ‎(90)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 2/28/2012
• Doc Name: VOL. 2, Appendix 1: Table of Contents & Introduction
• From: CRIPPLE CREEK & VICTOR GOLD MINING COMPANY
• To: DRMS
• Type & Sequence: AM10
• Email Name: TC1
• Media Type: D
• Archive: No

Mining Phase
Through
Amendment No.
8
Amendment No.
9 (MLE)
MLE2
Totals through
MLE2
Total (t)
540,000,000
360,000,000
724,000,000
1,605,000,000
Acid Generating Potential (t)
22,000,000
14,000,000
31,000,000
66,000,000
Acid Neutralizing Potential (t)
9,000,000
6,000,000
13,000,000
28,000,000
Net Neutralizing Potential (t)
- 12,000,000
- 8,000,000
- 18,000,000
- 38,000,000
Cresson Project Hvdroaeochemistry AdrianBrown
Stoichiometric evaluation shows that:
AGP = 31.2 * STOTAL
where: AGP = maximum acid generating potential (t CaCO3/kt) 6
STOTAL = total sulfur content ( %)
3.2.3 Acid Neutralizing Potential
ANP is computed from the carbon content of the sample. All carbon in the samples from the District is
inorganic, and derives from calcite and dolomite, both of which are reactive carbonates. ANP is
determined by computing the amount of calcium carbonate that would be present in the rockmass if the
entire inorganic carbon content was made up of calcium carbonate. The computation is performed using
the molecular weight of calcium carbonate and unit conversion from carbon percent, as follows:
ANP = [MWcaco3 / MWc] * [ CTOTAL ( %)] * [10 (ton /kt) / ( %)]
where: ANP = Acid neutralizing potential (t CaCO3/kt)
MWcaco3 = Molecular weight of CaCO3 (g)
MW = Molecular weight of carbon (g)
CTOTAL = Total carbon in sample ( %)
Thus:
ANP = 83.42 * [ CTOTAL ( %)]
3.2.4 Acid -Base Accounting
ABA analysis has been performed on the materials that will be produced through MLE2, divided by
mine and material (overburden and ore). The results are shown in Table 5, and summarized below for all
mined material (ore plus overburden).
The total ABA values are used for determination of the amount of neutralizing material required to
provide protection against oxidation of sulfide in the materials mined in the Cresson Project. This makes
the following assumptions:
6 The unit for AGP that is traditionally used is "tons of calcium carbonate per 1000 tons of rock ", abbreviated to "t CaCO ". This is the
number of tons of calcium carbonate — limestone or calcite - required to neutralize the maximum amount of acidity generated by the
complete oxidation of all of the sulfides in 1,000 tons of rock.
1385L.20120125
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