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Basic magnetically charged compass

The angle at which a structure is inclined from the horizon at 90 degrees

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