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The process of the underground mining of the 1800

User AquilaRapax
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Answer:

A system of air passages connected to the outside ventilated some mines and others used hand bellows or engine-powered fans. Early mines drained underground workings with tunnels or bucket bailers. Deep mining on the Comstock introduced large, steam-powered Cornish pumps.

Step-by-step explanation:

User Yazfield
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