| 21. | This allowed all ore processing residues, waste rock and overburden to be discharged into the Ok Tedi River.
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| 22. | The previous owner, he said, also removed more waste rock than emery and state officials tolerated his mine.
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| 23. | Much of the rock in the railbed was either waste rock from mines, or tailings containing heavy metals.
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| 24. | This is because of the higher grade of the ore and lower volumes of waste rock and tailings.
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| 25. | If the waste rock is destined for sale, he said, then the mine needs a separate quarry permit.
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| 26. | Echo Bay will seal two of the mines'tunnels and remove several piles of waste rock, known as tailings.
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| 27. | There is almost no waste rock.
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| 28. | The waste rock piles are contained and all runoff water is monitored and treated to water quality standards.
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| 29. | If a mine also wanted to sell waste rock, he said, then it must apply for a separate permit.
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| 30. | The piles of waste rock, though visible from miles away, are being reshaped to more closely replicate natural contours.
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