The document discusses mineral resources and mining. It defines minerals as naturally occurring substances with crystalline atomic structures and chemical formulas. It describes three main types of mining: underground mining, which digs into the ground; hydraulic mining, which uses high-pressure water jets; and open-cut mining, which removes resources through large surface pits. The document also classifies minerals as metallic, like iron and copper, which are extracted through heating, or non-metallic, like sand and limestone. Finally, it outlines some environmental impacts of mining, such as groundwater contamination, land subsidence, greenhouse gas emissions, and lung diseases in miners exposed to mine dusts.