Mineral mining

Mineral mining

The extraction of valuable minerals or other geological materials from the earth for economic interests.

Industry: Mining

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Mineral mining

Two-mica granite

Mining; General mining

A granite containing both dark mica (biotite) and light mica (muscovite). This rock was called true granite by Rosenbusch and binary granite by Keyes. Compare: aplogranite.

Stadia rod

Mining; General mining

A graduated rod used with an instrument having stadia hairs to measure the distance from the observation point to the place where the rod is positioned.

Measuring tape

Mining; General mining

A graduated tape, steel or linen, usually in 50-ft or 100-ft (15-m or 30.4-m) lengths; used by engineers, builders, surveyors, etc.

Levelling rod

Mining; General mining

A graduated rod used in measuring the vertical distance between a point on the ground and the line of sight of a surveyor's level.

Stadia

Mining; General mining

A graduated rod used with an instrument having stadia hairs to measure the distance from the observation point to the place where the rod is positioned.