Ore whose minerals resist separation by initial chemical processes and require further chemical decomposition
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Category: <span>R</span>
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
An ore or arsenic, Arsenic monosulfide.
A heavy, dense, rare element of the platinum group. Symbol, Rh
Rare mineral and metallic elements such as niobium, yttrium, Lanthanum, cerium, praseodymium, neodymium, samarium, thulium, ytterbium, neodymium, dysprosium, gadolinium, promethium, scandium and lutetium
A fine-grained, extrusive igneous rock, having parallel mineral composition with granite
A shaft or room that has been excavated from the ground upward
A heavy, dense and rare, silvery-white precious metal. Symbol, Re