Loose rock and dust, also debris
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Category: <span>D</span>
A type of igneous intrusive rocks containing plagioclase, hornblende, biotite or pyroxene minerals
The downward current of air or other gas in a mine shaft, tunnel, passage or large cavity
A green trigonal mineral, CuSiO2(OH)2
Precious metals such as gold and silver, cast in bars for transportation, storage
A monoclinic pyroxene mineral, CaMgSi2O6
A dome-shaped mound formed around a volcanic vent
An intrusion of magmatic rock forming between fractures of earlier rock
The housing and shelter for a drill rig
A volcanic vent formed by a gaseous magmatic thrust