| 31. | However, acid water continues to enter the river due to mine dewatering and run-off from the waste rock dumps.
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| 32. | A project to remove waste rock piles in the watershed of the creek was carried out in 2006 and 2007.
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| 33. | Often these voids ( stopes ) would be re-filled with waste rock from other diggings after ore removal was complete.
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| 34. | Coal strip mining methods and the surface disposal of waste rock results in the contamination of surface and ground waters.
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| 35. | The deposits must be machined to extract the metals in question from the waste rock and minerals from the reservoir.
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| 36. | Costs at BHP's coal mines in Queensland state rose due to increased waste rock removal charges and higher maintenance costs.
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| 37. | After production ceased, the area was recultivated, including flooding the mine, removing the mine buildings and covering the waste rock area.
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| 38. | The mine produces 9.3 million tons per year of ore and an additional 37 million tons per year of waste rock.
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| 39. | They have predicted pollution will occur at several locations as water drains through the waste rock that will be left behind.
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| 40. | The mine produces 3.6 million tons per year of ore and an additional 15 million tons per year of waste rock.
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