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

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

Lines converging at a single center

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

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

The layer of rocks, gravel, sand, soil and other matter between surface and bedrock

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

The percentage of valuable minerals successfully recovered in ore

An initial exploration and ground survey of mineral lands

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