the tiers of an open pit phosphate mine.

bedrock big blast boulder brown business charge chargess city cliff close conservation construction consumption deep deposit dig digging dike dirt drilling dump dynamite earth ecology environment equipment evaporation excavate excavation explosion explosives extraction geology heavy industrial industry lake machine machinery manmade metal mine mineral mining mountain moving natural open ore outside phosphate pit pollution precious quarry red resource roads rock soil stone strip tailings technology terrace terraces tiers truck water yellow