| Table 1: Summary of the Smith Ranch ISL pilot programme | |||
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| Q-Sand | O-Sand | ||
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| Leaching period |
October
1981 - November 1984 |
August
1984 - January 1991 |
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| Restoration period |
November
1984 - |
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| Restoration certified |
August 1987 |
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| Pilot flow rate | 6.3 l/s | 9.5 l/s | |
| 5-spot pattern size | 30 m x 30 m | 36 m x 36 m | |
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| Ore depth | 152 m | 229 m | |
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| In-place reserves | 61 235 kg | 103 480 kg | |
| Production | 35 380 kg | 96 615 kg | |
| Recovery | 58% | 93% | |
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