Underground hard-rock mining refers to various underground mining techniques used to excavate "hard" minerals, usually those containing metals, such as...

hard, the mining methods used differ from those used to mine deposits in igneous or metamorphic rocks (see underground hard-rock mining). Underground...

from underground coal mining, although accidents also occur in hard rock mining. Coal mining is considered much more hazardous than hard rock mining due...

was the most deadly event in underground hard rock mining in United States history. Most men died of suffocation underground as the fire consumed their...

mining district, also known as the Independence Mine/Hatcher Pass district, is a gold-mining area in the U.S. state of Alaska. Underground hard-rock mining...

mines and underground hard rock mining, about ninety percent. The last ten percent consists of placer and base metal mining. Sustainable mining has been...

above-ground mining structures are referred to as a "pit head". In Australia, "colliery" generally refers to an underground coal mine. Coal mining has had...

method used to break down the hard rock holding the gold. One of the complexes is shown in one of the earliest known mining maps. The miners crushed the...

theory, instrumentation surface mining; open-pit mining underground mining (soft rock) underground mining (hard rock) computing; DATAMINE, MATLAB, Maptek...

In underground mining a hoist or winder is used to raise and lower conveyances within the mine shaft. Modern hoists are normally powered using electric...