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Mining is the extraction of valuable minerals or other geological materials from the Earth, usually from an ore body, lodeveinseamreefor placer deposit. These deposits form a mineralized commodity that big mining companies of economic interest to the miner. Ores recovered by mining include metalscoaloil shalegemstoneslimestonechalkdimension stonerock saltpotashgraveland clay. Mining is required to obtain any material http://rectoria.unal.edu.co/uploads/tx_felogin/why-do-cosmetic-for-our-business-which/difference-between-male-and-female-reproductive-system.php cannot be grown through agricultural processes, or feasibly created artificially in a laboratory or factory.
Mining in a wider sense includes extraction of any non-renewable resource such as petroleum, natural gas, or even water.
Modern mining processes involve prospecting for ore bodies, analysis of the profit potential of a proposed mine, extraction of the desired materials, and final reclamation of the land after the mine is closed. Mining operations usually big mining companies a negative environmental impact, both during the mining activity and after companeis mine has closed. Hence, most of the world's nations have passed regulations to decrease the impact. Big mining companies safety has long been a concern as well, and modern practices have significantly improved safety in mines. Since the beginning of civilization, people have used stoneceramics and, later, metals found close to the Earth 's surface.
These were used to make early tools and weapons ; for example, high quality flint found in northern Francesouthern England and Poland was used to create flint tools. The mines at Grimes Graves and Krzemionki are especially famous, and like most other flint mines, minng Neolithic in origin c.
Other hard rocks mined or collected for axes included the greenstone of the Langdale axe industry based in the English Lake District. At this site Paleolithic humans mined hematite to make big mining companies red pigment ochre.
Ancient Egyptians mined malachite at Maadi.]