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Ore - Wikipedia

An ore is an occurrence of rock or sediment that contains sufficient minerals with economically important elements, typically metals, that can be economically extracted from the deposit The ores are extracted from the earth through mining; they are then refined (often via smelting) to extract the valuable element, or elements The ore grade, or concentration of an ore mineral or metal, as ....

Copper Ores and Copper Bearing Minerals - Nevada Outback

Photographs of real high grade copper ores and rich bonanza copper native copper specimens mined - Nevada Outback's gold...

Iron Ore - Mining Artifacts

Hematite iron is typically rarer than magnetite bearing banded iron formations or other rocks which form its main source or protolith rock, but it is considerably cheaper and easier to beneficiate the hematite ores and requires considerably less energy to crush and grind...

Types of Wall Rock Alteration ~ Mining Geology

Apr 30, 2015· Pyrite is a standard alteration product around sulphide ore deposits (since iron is one of the most abundant metals in the earth's crust) Pyrite forms whenever sulfur is added to a host rock containing iron or ferro-magnesian minerals...

Iron Ore | Geoscience Australia

Jun 30, 2016· Resource figures are current as at 30 December 2015 Commentary is current as of December 2016 Iron (Fe) is a metallic element that constitutes about 56% by weight of the Earth's crust and is the fourth most abundant element in the crust Iron ores are rocks from which metallic iron can be economically extracted...

Bauxite | ore | Britannica

,producer of iron ore and bauxite Iron ore output exceeded 60 million tons in the early 1960s, originating principally in Lorraine; but production has now ceased, despite the continued existence of ,...

Iron ore - Wikipedia

Banded iron formations (BIFs) are sedimentary rocks containing more than 15% iron composed predominantly of thinly bedded iron minerals and silica (as quartz)Banded iron formations occur exclusively in Precambrian rocks, and are commonly weakly to intensely metamorphosedBanded iron formations may contain iron in carbonates (siderite or ankerite) or silicates (minnesotaite, greenalite, ,...