Explain subsurface mining. Include explanations for: room-and-pillar mining; longwall mining and solution mining .
Mining Explain subsurface mining. Include explanations for: room-and-pillar mining; longwall mining and solution mining . Explain surface mining. Include explanations for: open-pit mining; surface coal mining;quarrying; solar evaporation. Explain placer mining,hydraulic mining,smelting and undersea mining.