1. Mining tailings are  a accumulated debris from rockfalls and rock slides.  b a type of a fish that is found in abandoned mines.  c the piles of crushed waste rock created as a by-product of mineral processing.  d the hindmost part of an animal, especially when prolonged beyond the rest of the body, such as the flexible extension of the backbone in a vertebrate, the feathers at the hind end of a bird, or a terminal appendage in an insect.   2. Mineral resources (not reserves) are  a the quanity of a material that con be removed at a profit.  b economically feasible for extraction. c total quantity of a material that can be used by humans d the quantity of a material that has been found and is recoverable economically with existing technology.      3. An ore is  a the quantity of a material that has been found and is recoverable economically with existing technology.  b a rock in which a valuable or useful metal occurs at a concentration sufficiently high to make it economical to mine.  c a sedimentary rock usually sandstone containing thick, heavy tar-like hydrocarbon bitumen.  d the quantity of a resource material expected to be found in areas in which like deposits are known to exist.

the quantity of a material that has been found and is recoverable economically with existing technology. 

a rock in which a valuable or useful metal occurs at a concentration sufficiently high to make it economical to mine. 

a sedimentary rock usually sandstone containing thick, heavy tar-like hydrocarbon bitumen. 

the quantity of a resource material expected to be found in areas in which like deposits are known to exist.