Stone Age
Stone Age, prehistoric cultural stage, or level of human development characterized by the creation and use…
Silver
Silver (Ag), chemical element, a white lustrous metal valued for its decorative beauty and electrical conductivity.…
Gold
Gold (Au), chemical element, a dense lustrous yellow precious metal of Group 11 (Ib), Period 6,…
Metallurgy
Metallurgy, art and science of extracting metals from their ores and modifying the metals…
Mineral deposit
Mineral deposit, aggregate of a mineral in an unusually high concentration. About half of the known chemical…
Gangue
Smelting Perhaps 1,000 years after humans learned about melting virgin copper, they found…
Mining
Mining, process of extracting useful minerals from the surface of the Earth, including the seas.…
Mineral
Mineral, naturally occurring homogeneous solid with a definite chemical composition and a highly ordered atomic arrangement; it is usually…


