USA HISTORY

Detailed explanation-1: -Open-pit mining involves digging a large, terraced hole in the ground in order to remove a near-surface ore body (Figure 13.5. 2.

Detailed explanation-2: -There are four main methods of mining: underground, surface, placer and in-situ. The type of mining method used depends on the kind of resource that is being targeted for extraction, the deposit’s location below or on the Earth’s surface and the capacity of each method to profitably extract the resource.

Detailed explanation-3: -Underground mining Sub-surface mining consists of digging into the earth tunnels or shafts to reach the deposits of buried ore. Ore is brought to the surface through tunnels and shafts for processing, and waste rock for disposal.

Detailed explanation-4: -In underground mining, ores are removed from deep within the earth. Miners blast tunnels into the rock to reach the ore deposits.

Detailed explanation-5: -Glory hole-An open pit from which ore is extracted, especially where broken ore is passed to underground workings before being hoisted.