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Radium

A trace radioactive element, symbol, Ra. It occurs in uranium ores

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Radiolaria

Marine protozoa subject to silica replacement fossilization sound in limestone, shale and other rocks

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Radioactivity

Alpha, beta or gamma energy emitted by the decay of atomic nuclei from their radioactive source

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Refractory ore

Ore whose minerals resist separation by initial chemical processes and require further chemical decomposition

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Recovery

The percentage of valuable minerals successfully recovered in ore

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Reclamation

The closing and rehabilitation of a mine back to its original or natural state

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Rhodium

A heavy, dense, rare element of the platinum group. Symbol, Rh