GoldFact: There are two types of mine "open pit" and "underground". The type of mine is determined by the nature of the gold deposits and whether they are close to ground level or deep beneath the surface.

Isa Bullion - GoldFact: There are two types of mine "open pit" and "underground". The type of mine is determined by the nature of the gold deposits and whether they are close to ground level or deep beneath the surface.