annexc - Newmont Mining Corporation

TABLE C3-2 (continued)
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”.