A summary of each of the total cost equations, with corresponding square of the correlation coefficient (r2) and number of observations (n), is shown below. The r2 number indicates the scatter of the data points that are explained by the linear regression of the logarithmic values.
Open Pit Mine Models |
Capital Cost |
Operating Cost |
Small open pit |
160,000(X)0.515 |
71.0(X)-0.414 |
r2, n |
0.981, 6 |
0.962, 6 |
Large open pit |
2,670(X)0.917 |
5.14(X)-0.148 |
r2, n |
0.995, 6 |
0.821, 6 |
Underground mine models |
|
|
Block Caving |
64,800(X)0.759 |
48.4(X)-0.217 |
r2, n |
0.999, 4 |
0.998, 4 |
Cut-and-fill |
1,250,000(X)0.461 |
279(X)-0.294 |
r2, n |
0.959, 3 |
0.956, 3 |
Room-and-pillar |
97,600(X)0.644 |
35.5(X)-0.171 |
r2, n |
0.994, 3 |
0.988, 3 |
Shrinkage-stope |
179,000(X)0.620 |
74.9(X)-0.160 |
r2, n |
0.998, 3 |
0.992, 3 |
Sublevel-longhole |
115,000(X)0.552 |
41.9(X)-0.181 |
r2, n |
0.993, 3 |
0.997, 3 |
Vertical crater retreat |
45,200(X)0.747 |
51.0(X)-0.206 |
r2, n |
1.000, 3 |
0.997, 3 |
Mill models |
|
|
Autoclave-CIL-EW |
96,500(X)0.770 |
78.1(X)-0.196 |
r2, n |
0.998, 3 |
0.995, 3 |
CIL-EW |
50,000(X)0.745 |
84.2(X)-0.281 |
r2, n |
0.999, 3 |
0.991, 3 |
CIP-EW |
372,000(X)0.540 |
105(X)-0.303 |
r2, n |
0.985, 3 |
0.922, 3 |
CCD-MC |
414,000(X)0.584 |
128(X)-0.300 |
r2, n |
0.990, 3 |
0.969, 3 |
Float-roast-leach |
481,000(X)0.552 |
101(X)-0.246 |
r2, n |
0.959, 3 |
0.989, 3 |
Flotation, one product |
92,600(X)0.667 |
121(X)-0.335 |
r2, n |
0.985, 3 |
0.966, 3 |
Flotation, two product |
82,500(X)0.702 |
149(X)-0.356 |
r2, n |
0.968, 3 |
0.964, 3 |
Flotation, three product |
83,600(X)0.708 |
153(X)-0.344 |
r2, n |
0.966, 3 |
0.966, 3 |
Gravity |
135,300(X)0.529 |
67.8(X)-0.364 |
r2, n |
0.986, 3 |
0.999, 3 |
Heap leach |
296,500(X)0.512 |
31.5(X)-0.223 |
r2, n |
0.971, 3 |
0.984, 3 |
Solvent-extraction-EW |
14,600(X)0.596 |
3.00(X)-0.145 |
r2, n |
1.000, 3 |
0.965, 3 |