Cavities formed along strata caused by natural or manmade forces
Cavities formed along strata caused by natural or manmade forces
Solid rock attached to the earth
Generally describing layers of sedimentary rock
A mill utilizing a hammer and swing arm apparatus to pulverize ore
Dropping prices or value in a financial market
Production of economic minerals from beach deposits including beach placers
A circular centrifugal device which accelerates electrons with a rotating magnetic field
Concentrations of wave and wind formed mineral sand deposits, usually zoned from the high water level
An elementary particle emitted from a nucleus during its radioactive decay, having a single electrical charge and mass equal to 1/1837 of a proton
An ore of aluminum