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Fibrous

Minerals that occur in strings, strands, threads or fibers, such as asbestos

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Ferrous

A terms used to describe a substance containing iron

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Felsic

A term that describes light-colored volcanic rocks containing feldspar

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Feldspar

A group of common igneous rocks with constituent elements forming minerals that includes microcline, orthoclase, plagioclase and others

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Feed rate

The calculated speed of drill bit advancing through rock or overburden

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Feasibility studies

A report compiling qualified information used to determine the viability of developing a mineral deposit based on the extent of risk involved