In most cases, reserves contain minerals exceptionally concentrated in one place well above what scientists and geologists call "crustal abundance, " the frequency of the mineral in the specified rock.

WSJ: Exhausting the Earth's Resources? Not So Fast

Dr Hazen and his team speculate from meteorite and early rock studies that several hundred mineral species, including zircon, quartz, clay and halite salt crystals, formed during this early period of mineral evolution.

ECONOMIST: Minerals

The Elimination of Double Subsidies for the Hard rock Mining Industry Act takes on depletion allowances for mineral extraction based industries.

FORBES: Connect