Copper can be mined using this controversial technique in which the earth above the ore is removed
... Prospecting to locate ore; Exploration to find and then define the extent 
and value of ... Mining techniques can be divided into two basic excavation types:
... [DOC] [TLE] Mining - Opposing Viewpoints in Context - Gale [PAR] Mining can be done only in places where there is an economically viable deposit 
of ... Each sector uses a range of extraction techniques and faces environmental 
... of removing silver from copper oreliquation and mercury amalgamationled 
to ... Coal at the surface of the earth is amenable to large-scale open-pit mining.