ONE definition of stemming is inert material, such as fine gravel, that is placed on top of explosives in a hole drilled in the rock. When the explosives are fired, the stemming locks together from the expanding gasses, and keeps the force of the explosion in the borehole a few thousandth of a second, until rock begins to break.
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The two types of mining are Open-cast mining and Underground mining. Underground mining is further divided in to Adit mining and Shaft mining.
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