There is no one person to point to, but the genesis was in the 1960s and 70s when the need for coal, and the need for it to be cheap, led to the creation of this less expensive method of coal extraction. The petroleum crises of 1973 and 1979 are part of the reason this began. Fewer workers are required and almost the entire coal seam is able to be exhausted so maximum profit is achieved.
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