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Riparian

Land adjacent to a large waterbody, connected in the same watershed

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Reserves

The extent of mineralization by size and value, calculated by sound volumetric procedures

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Representative sample

Samples large enough to contain a similar percentage of mineral constituents of the host rocks from which it was removed

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Rutile

A tetragonal mineral and ore of titanium, TiO2

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Ruthenium

A silvery white, hexagonal platinum group metal. Symbol, Ru

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Runoff

Water that drains from a flood plain, or higher structure into streams, rivers, or other channels

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Ruby

The red, gemstone variety of corundum Al2O3. Sapphires represent the blue variety of the same substance