Table 4 Second run laboratory results.
From: Thiosulfate leaching in carbonaceous gold-bearing ores in Ethiopia
Test-3 | Sodium thiosulfate (8 g/l) | |||
|---|---|---|---|---|
Time (hr.) | Au in solution (g/t) | Percent recovery (%) | pH | Free TS (ppm) |
0 | 0.00 | 0.00 | 11.50 | ND |
2 | 0.41 | 32.85 | 11.67 | ND |
4 | 0.46 | 36.86 | 11.61 | ND |
8 | 0.52 | 41.67 | 11.44 | ND |
24 | 0.74 | 59.29 | 11.59 | ND |
30 | 0.78 | 62.50 | 11.51 | ND |
48 | 0.83 | 66.51 | 11.18 | ND |
Test-4 | Sodium cyanide (0.25 g/l) | |||
|---|---|---|---|---|
Time (hr.) | Au in solution (gm/ton) | Percent recovery (%) | pH | Free CN- (ppm) |
0 | 0.00 | 0.00 | 11.92 | 250 |
2 | 0.22 | 17.63 | 11.69 | 150 |
4 | 0.30 | 24.04 | 11.60 | 35 + 150 |
8 | 0.37 | 29.65 | 11.42 | 150 |
24 | 0.33 | 26.44 | 11.72 | 100 + 150 |
30 | 0.45 | 36.06 | 11.35 | 200 |
48 | 0.48 | 38.46 | 11.21 | 150 |
