| The huge wealth of nature, hidden deep in the earth's crust, the man learned to produce by creating pits. So extract metals, coal and so on. Metals are very diverse and their used by man are very different. Iron - a very common element of the crust: for the formation of its industrial concentration should increase the average amount of 10-15 times against his detention in the crust. Large ore deposits, with huge reserves of rich ore, containing up to 70% of iron, formed under very different conditions. . Platinum Deposits of platinum and chrome, very fungible always confined to the ultra-basic igneous rocks of olivine, that is essentially a rock with a local enrichment chromic iron ore minerals and platinum group metals. Chemical resistance of platinum causes the formation of rich alluvial deposits. In primary deposits of platinum is contained in the chromites, or directly in olivine. Accumulations of platinum are confined to the bottom of the laccoliths and either scattered in the rock or in contact skarns. Some fields are tubular conductors olivine rocks rich platinum from 12 to 77 grams per ton. Titan Titanium deposits are accumulations of the mineral ilmenite, usually always with magnetite, and belong to the magmatic deposits associated with major deep-seated igneous rocks. Nickel deposits are known two sharply distinct types: the field associated with the ultra basic rocks, and deposits of weathering. |