Relatively small scale mining, usually performed for exploration purposes, utilizing hand tools such as picks, shovels, sluices, goldpans and not powered equipment
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Tag: <span>H</span>
A milling machine that utilizes a series of revolving hammers to pulverize falling rock led through a chute
A rock drill powered by compressed air with a clutch that allows it to not only spin the drill bit, but also a percussive hammering action
Rock salt, 4[NaCl]
A group of minerals whose chemical compound consists of a halogen with a more electropositive element or group
Term used to describe a radioisotopes decay to 50% of its current energy
Said of rocks with a jagged or fractured surface
A general term used to describe a rock by its surficial appearance including crystal form
A retaining wall at one or both ends of a culvert structure
The steel, concrete or timber frame at the top of a shaft usually rigged to support hoist cables