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When underground mining became too costly in the 1950's, Berkeley Pit became an open pit mine. As the mine grew bigger and deeper, groundwater began to seep into the pit, and pumps had to be installed to keep it from slowly flooding.

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Open pit mining is the preferred method for mining gold, silver, and uranium. This type of mining is also used to dig for coal and building stone.

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Open-pit mining, also known as opencast mining, open-cut mining, and strip mining, means a process of digging out rock or minerals from the earth... Click & Chat Online mining

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Strip Mining, Open-pit Mining, Surface Mining, … Strip mining is a kind of surface mining. The ore is very near to the surface of the land but has one or more layers of rock and filth on top of it.

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Draglines. A large dragline system used in the open pit mining industry costs approximately $50-100 million, and weigh in the vicinity of 2000 metric tonnes, draglines are …