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| unpay ore | |||
| no-go; unpayable ore (ores may be classified as follows. First, "payable ore" that can be profitably worked under existing conditions. Second, "marginal ore" that can be profitably worked only when metal prices are high and a market is assured, third, "unpayable ore" that is so lean thai the cost of recovering the metal would exceed Us market 'value. Alexander Demidov) | |||
| lean ore | |||