| 11. | By the time of the switch after 1600 to imported pit coal, considerable damage had been done.
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| 12. | Known from the Eocene whose fossils were found in an open pit coal mine located in Gujarat, India.
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| 13. | The deposits are maintained by the mines and the open-pit coal mines of the " Lipovetskoye Mine Administration ".
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| 14. | Statistics on open-pit coal mining are compiled by the British Geological Survey from information provided by local planning authorities.
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| 15. | A former open-pit coal mine, it was flooded in 1999 with groundwater and developed in 2006 as a tourist area.
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| 16. | Open-pit coal mines usually last four or five years at extraction rates of up to a quarter-million tons a year.
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| 17. | A former open-pit coal mine, the lake was flooded in 1999 with groundwater and developed as a water recreation area.
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| 18. | In 1988 the International Joint Commission, ruled that a proposed open pit coal mine would violate the 1909 Boundary Waters Treaty.
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| 19. | Coal from the Cerrej�n Formation is mined extensively from the Cerrej�n open-pit coal mine, one of the largest in the world.
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| 20. | Colombia has one of the largest open pit coal mines in the world in the region of Cerrejon in the Guajira Peninsula.
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