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Rhenium

A heavy, dense and rare, silvery-white precious metal. Symbol, Re

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Radon

The heaviest radioactive gas element, symbol, Rn

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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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Replacement ore

Rocks transformed by the replacement of eroded or precipitated minerals, by the introduction of newly deposited minerals and while retaining a high percentage of its original form

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Relief

Another term for the shape of the earth surface at a specific point