GEOLOGY
GEOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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when minerals are pulled directly out of the ground
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when minerals lying over a deposit are removed to expose the resources for processing
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when people remove minerals using picks and axes
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when underground mineral resources are removed through tunnels and shafts
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Detailed explanation-1: -Surface mining is a form of mining in which the soil and the rock covering the mineral deposits are removed. It is the other way of underground mining, in which the overlying rock is left behind, and the required mineral deposits are removed through shafts or tunnels.
Detailed explanation-2: -In surface mining, the ground is blasted so that ores near Earth’s surface can be removed and carried to refineries to extract the minerals. Surface mining can be destructive to the surrounding landscape, leaving huge open pits behind. In underground mining, ores are removed from deep within the earth.
Detailed explanation-3: -These include strip mining, open-pit mining, mountaintop removal, dredging and highwall mining.
Detailed explanation-4: -Minerals can be extracted by mining, drilling or quarrying (Fig 3.3). The process of taking out minerals from rocks buried under the earth’s surface is called mining. Minerals that lie at shallow depths are taken out by removing the surface layer; this is known as open-cast mining.