Question

Differentiate between open cast and shaft mining.

Answer 1

Explanation:

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Open cast mining in which large pits are dug to excavate the ores lying at shallow depths beneath the surface of the earthDeep.

shaft mining in which deep holes are made to reach the ore lying at great depth beneath the crust

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Answer 2

Answer:

Open cast mining-

Essentially, overburden is removed, the exposed ore is recovered, and the pit is filled, progressively, by the next tranche of overburden.The working footprint of an opencast mine like Macraes in Otago would typically be up to 300 ha although the total area mined over time would be much greater than that.

Shaft mining -

it is excavating a vertical or near-vertical tunnel from the top down, where there is initially no access to the bottom.All underground mines have some crucial components in common: ventilation shafts to clear toxic fumes from drilling and blasting