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Relatively small scale mining, usually performed for exploration purposes, utilizing hand tools such as picks, shovels, sluices, goldpans and not powered equipment

A milling machine that utilizes a series of revolving hammers to pulverize falling rock led through a chute

A machine using for hoisting a cage or crate in a shaft or tunnel

Flat terrain at the back of a folded mountain range. This term also applies to an area of land, lying behind a coastal area or seaport area

Gravel deposits where bedrock is higher than the surrounding areas and the deposit is generally not prone to benching, usually a dry placer

Sections of ore which contain high economic concentrations of target minerals

Sections of ore which contain high economic concentrations of target minerals

Consisting of not one but various elements

A geologic process occurring inside or below the Earth’s crust

Exactly half of a sphere