A shaft or room that has been excavated from the ground upward
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Tag: <span>R</span>
A heavy, dense and rare, silvery-white precious metal. Symbol, Re
The heaviest radioactive gas element, symbol, Rn
Land adjacent to a large waterbody, connected in the same watershed
A uranium prospecting technique which detects traces of radon gas
The extent of mineralization by size and value, calculated by sound volumetric procedures
Samples large enough to contain a similar percentage of mineral constituents of the host rocks from which it was removed
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
The time lapse between volcanic eruptions
Having the shape of a kidney