Answer:
Well ill try to answer as much as i can think of.Deforestation (logging) of area to create the mine and roads to transport the mined products. That can result in loss of wildlife and or extinction of species. Chemicals and/or vapours that are produced in smelting get placed in the atmosphere. Not to mention all the resources like metal, electricity and oil/petroleum to buid a mine and support an active mine. Emissions from vehcles or tranport to transport it. The salt bit im not so sure about apart from the vapours and chemicals that are dispersed into the atmosphere. I guess it contributes to global warming. And as far as oil goes there is also the burn off of oil that cannot be used or isn't the appropriate grade I hope that's helped