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| ash dumps (1) |
| commercial exploitation (1) |
| gradation (1) |
| man-made waste formations and deposits (1) |
| smelter slag dumps (1) |
| tailing dumps (1) |
| waste heaps (1) |
| ash dumps (1) |
| commercial exploitation (1) |
| gradation (1) |
| man-made waste formations and deposits (1) |
| smelter slag dumps (1) |
| tailing dumps (1) |
| waste heaps (1) |