| 21. | The new mine would be underground, with less impact on the environment than open pit mines.
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| 22. | The strike began Wednesday in the Kolubara open pit mine and spread Thursday to nearby Kostolac.
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| 23. | Open pit mining ended in 1976 when the pit reached a final depth of 300 m.
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| 24. | Almost all the gold in Nevada comes from large open pit mining and with heap leaching recovery.
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| 25. | The deposit is essentially flat-lying at the surface, making open pit mining the extraction method of choice.
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| 26. | Early mining has shown that the deposit can be developed through a simple open pit mining process.
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| 27. | The district has rich lignite ( brown coal ) deposits, which is used in open pit mining.
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| 28. | By 1890, underground copper mining had started, and in 1907, Kennecott Copper Mine started open pit mining.
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| 29. | Both open pit mines are being operated in areas which used to have reclaimed for other uses.
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| 30. | In 1986, Coeur d'Alene Mines began large scale open pit mining operations on Nenzel Hill and beyond.
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