The layer of rocks, gravel, sand, soil and other matter between surface and bedrock
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Category: <span>R</span>
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
Any natural mineral, alone or in combination
A large pile of boulders and gravel, collected and concentrated by the action of a river or other channel
A tetragonal mineral and ore of titanium, TiO2
A silvery white, hexagonal platinum group metal. Symbol, Ru
Water that drains from a flood plain, or higher structure into streams, rivers, or other channels
The red, gemstone variety of corundum Al2O3. Sapphires represent the blue variety of the same substance