Ore genesis

Often a deposit will contain a mixture of all three types of ore. Metamorphic processes also control many physical processes which form the source of hydrothermal fluids, outlined above. Deposits are classified as primary, alluvial or placer deposits, or residual or laterite deposits.

Sedimentary or surficial processes exogenous [ edit ] Surficial processes are the physical and chemical phenomena which cause concentration of ore material within the regolithgenerally by the action of the environment. It is proposed at this phase the brine also leaches some of the gold from the vuggy silica, and becomes even more gold-enriched before it is precipitated at the boiling zone.

Ore genesis

Alternatively, platinum occurs in association with chromite either within the chromite mineral itself or within sulfides associated with it.

Radon is a common problem during mining of uranium as it is a radioactive gas. Some iron deposits within the Pilbara of West Australia are placer deposits, formed by accumulation of hematite gravels called pisolites which form channel-iron deposits.

He had held some of the Old Wasp ore in his hands, and he stated that the Mammoth ore had significant galena also. Ore genesis theories for these ores are wide and varied, but most involve metamorphism and igneous activity.

The key to this process was the discovery of high quantities of Lithium in gossans found throughout the property; the largest gossans have over ppm Li. Iron ore Iron ores are overwhelmingly derived from ancient sediments known as banded iron formations BIFs.

Ore Genesis

Sulfates can be seen on this outcrop also. These are preferred because they are cheap to mine. Placer deposits are sourced from pre-existing gold deposits and are secondary deposits. These are internal processes, hydrothermal processes, metamorphic processes and surficial processes.

These are internal processes, hydrothermal processes, metamorphic processes and surficial processes. Alternatively, platinum occurs in association with chromite either within the chromite mineral itself or within sulfides associated with it.

This includes placer deposits, laterite deposits, and residual or eluvial deposits. Sulfates coating the gossan can be seen. Particular environmental conditions are needed to transport enough iron in sea water to form these deposits, such as acidic and oxygen-poor atmospheres within the Proterozoic Era.

The source of platinum and palladium deposits is ultramafic rocks which have enough sulfur to form a sulfide mineral while the magma is still liquid. These sediments are composed of iron oxide minerals deposited on the sea floor. Sulfide phases only form in ultramafic magmas when the magma reaches sulfur saturation.

The actual vents are believed to have all been excavated and filled back in. However most metals of economic importance are carried as trace elements within rock-forming minerals, and so may be liberated by hydrothermal processes.

The foundations of hydrothermal processes are the source-transport-trap mechanism.

Vanadium Tunicates such as this bluebell tunicate contain vanadium as vanabin. The beds dip to the east. Some laterite deposits are formed by wind erosion of the bedrock leaving a residuum of native gold metal at surface.

Placer gold deposits form via gravity, with the density of gold causing it to sink into trap sites within the river bed, or where water velocity drops, such as bends in rivers and behind boulders. Considerable electrum occurred abundantly free as wire, dust and flakes in white to glassy crystalline quartz stained extensively by pyrolusite, hematite, and limonite derived from oxidized pyrites.

The metals and sulfur are precipitated at the boiling zone above diagram. A similar biological process might have played a role in the formation of vanadium ores. Uranium is also found associated with certain igenous rocks, such as granite and porphyry.

In magmas, sulfides may separate and sink below the silicate-rich part of the intrusion or be injected into the rock surrounding it. On the east footwall, free gold occurred with galena, anglesite, malachite, chrysocolla, and hematite in an extremely heavy ore 12 inches wide that assayed opt gold and 56 opt silver.

The majority of metal deposits formed by hydrothermal processes include sulfide mineralsindicating sulfur is an important metal-carrying complex. Sedimentary copper forms within ocean basins in sedimentary rocks. On the east footwall, free gold occurred with galena, anglesite, malachite, chrysocolla, and hematite in an extremely heavy ore 12 inches wide that assayed opt gold and 56 opt silver.

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Ore genesis

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Ore Genesis

The various theories of ore genesis explain how the various types of mineral deposits form within the Earth's crust. Ore genesis theories are very dependent on the mineral or commodity. Ore genesis theories generally involve three components: source, transport or conduit, and trap.

The various theories of ore genesis explain how the various types of mineral deposits form within the Earth's crust. Ore genesis theories are very dependent on the mineral or commodity. Ore genesis theories generally involve three components: source, transport or conduit, and trap.

Ore genesis From Wikipedia, the free encyclopedia Jump to: navigation, search The various theories of ore genesis explain how the various types of mineral deposits form within the Earth's crust. Ore genesis theories are very dependent on. Pre-Witwatersrand and Witwatersrand Conglomerates in South Africa: A Mineralogical Comparison and Bearings on the Genesis of Gold-Uranium Placers Saager, R.

The Ore Genesis Model in Arkose Breccia Below is a model of the ore genesis beneath the pre-ore basalt. It is believed the size of the orebodies in brecciated arkose (the Whitetail Formation) have the potential to be much larger than the ones beneath the basalt because of the brecccia’s porosity and reactivity.

Ore genesis
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