annexc - Newmont Mining Corporation

Annex C3 – Geology and Geochemistry Supplemental Information C3 - 11
TABLE C3-3 (continued)
Lithology Key
GMY = Graphitic Mylonite QE = Quartz-Epiclastic Unit
GRAP = Graphitic Shear Breccia QV = Quartz Vein
GW = Greywacke SAP = Saprolite
MV = Mafic Volcanic Unit * = Denotes a major waste classification
Criteria for ANP:AGP Ratios:
Rock is assumed to be potentially acid-generating if ANP:AGP ≤ 1.0. Rock is not considered potentially acid generating if
ANP:AGP > 3.0. For samples having ANP:AGP between 1.0 and 3.0, the rock has uncertain potential to generate acid
(USBLM 1996).
Criteria for NCV Classification
Highly Acidic (HA) NCV < -5 % CO2
Acidic (A) -5 < NCV < -1 %
Slightly Acidic (SA) -1 < NCV 0.1 or AGP < -0.1)
Inert (I) -0.1< NCV < 0.1 and (ANP < 0.1 and AGP > -0.1)
Slightly Basic (SB) 0.1 < NCV < 1
Basic (B) 1< NCV < 5
Highly Basic (HB) 5 < NCV
NCV Classification based on document “Newmont Standard Waste Rock Evaluation Methods – Protocol for NCV
Classification Studies”.
TABLE C3-4
Mineralogical Composition of Samples from Akyem Mine Pit Area
Sample
%
Qz
%
Plag
%
Ank
%
Sid
%
Cal
%
Musc
%
Chlor
%
Kaol
%
Pyr
%
Goe
%
Rut
NCV 01 GW B 22 37 15 18 7 1 0.4
NCV 02 GW HB 32 26 30 11 1 0.5
NCV 03 MV HB 23 27 35 8 6 1.5 0.9
NCV 04 SAP I 43 16 25 16 0.7
NCV 05 SAP SB 38 9 25 3 15 10 0.4
NCV 06 QE B-HB 27 42 14 16 1.5 0.3
NCV 07 QV B-HB 50 22 12 14 2 0.5
NCV 08 GMY-GRAP HB 36 17 27 16 2 1.5 0.5
NCV 09 GW SB 52 10 33 0.5 5 0.7
NCV 11 MV B 41 26 16 11 4 2 1.3
NCV 12 MV1 HB 29 20 23 8 12 7 1 0.1
NCV 13 QV SB 72 17 6 4 1 0.6
NCV 14 QV SA 94 3 2 0.5
NCV 15 SAP B 33 32 7 2 17 6 3 1
NCV 16 GRAP I 49 2 36 4 9 1.8
NCV 17 MV1 B 29 22 9 18 8 14 0.5
% Qz - Weight Percent Quartz; % Plag - Weight Percent Plagioclase; % Ank – Weight Percent Ankerite; % Sid -
Weight Percent Siderite; % Cal - Weight Percent Calcite; %Musc - Weight Percent Muscovite; % Chlor - Weight
Percent Chlorite; % Kaol - Weight Percent Kaolinite; %Pyr - Weight Percent Pyrite; % Goe - Weight Percent
Goethite; % Rut - Weight Percent Rutile; Tr – Trace.
Source: Newmont (2005a).
Akyem Gold Mining Project August 2008 DRAFT EIS