| 41. | Pre-open pit mining began in 1863 by Comstock Lode miners.
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| 42. | Pebble West would probably be mined as an open pit.
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| 43. | Together they are termed generically as the Nchanga Open Pits.
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| 44. | It is also an open pit mine and produces copper.
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| 45. | The collapse occurred Friday at the Shinkolobwe mine, an open pit honeycombed with tunnels.
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| 46. | Open pit mining started at the Rowe mine in 1912.
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| 47. | First the clay was extracted from open pits or mines.
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| 48. | The open pit mine has operated over historic underground gold mine workings since 1988.
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| 49. | Barless cages and open pits display baboons, penguins, flamingos, and other exotic species and birds.
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| 50. | Mining is carried out in an open pit operation.
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