- Deep mining
- Extraction of coal or minerals at depths greater than 1,000 feet. Coal usually is deep-mined at not more than 1,500 feet.California Energy Comission. Dictionary of Energy Terms
Energy terms . 2014.
Deep mining
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Mining in South Africa — has been the main driving force behind the history and development of Africa s most advanced and richest economy. Large scale and profitable mining started with the discovery of a diamond on the banks of the Orange River in 1867 by Erasmus Jacobs … Wikipedia
