Mining
is the drawing out of valuable minerals or other forms of geological
matters from the earth, commonly (but not always) from an ore
body, vein or (coal) stratum. Materials unearthed by mining consists
of bauxite, coal, copper, gold, silver, diamonds, iron, precious
metals, lead, limestone, nickel, phosphate, oil shale, rock salt,
tin, uranium and molybdenum. Any matter that cannot be grown from
farming processes, or created unnaturally in a laboratory or factory,
is commonly mined. Mining in a wider sense encompasses extraction
of any non-renewable natural reserves (e.g., petroleum, natural
gas, or even water).
The
mining industry holds 5 main industry sectors, which are classified
by the resources they generate: oil and gas extraction, coal mining,
metal ore mining, nonmetallic mineral mining and quarrying, and
sustain actions for mining.
There
are 2 types of familiar mining strategies. They are