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Three major deposit types: i) NickelCopper Deposits ii) Chromite Deposits iii) Platinum Group Elements Deposits Minor amounts of Cr and PGE are also recovered from eluvial or alluvial (placer) deposits. Discovery Hill, Voisey''s Bay. MAGMATIC NICKELCOPPER DEPOSITS (+/ PGE) BACKGROUND: Most important source of nickel. ENVIRONMENT: They occur in: Plutonic Rocks (form
A few giant mineral deposits (greater than 30 Mt) and several copperrich and zincrich deposits of median tonnage (~2 Mt) skew the averages. Several large VMS camps are known in Canada, including
Bedded replacements, lead, zinc, silver, copper deposits in limestone, generally occur in more or less flatlying (MANTOS) clusters having lateral dimensions of a hundred to several thousand feet, but are usually less than a hundred feet thick.
· Other types of copper deposits found throughout the world include: Volcanogenic massive sulfide (VMS) ore deposits, a source of copper sulfide formed through hydrothermal events in submarine
Porphyryassociated deposits Coppergold stockworks and veins: CadiaRidgeway, Northparkes, Copper Hill. Coppermolybdenum deposits: Dogwood. Breccia pipe deposits: Kidston, Mt Leyshon. Epithermal goldsilver deposits: High sulphidation type: Peak Hill, Gidginbung. Low sulphidation type: Pajingo. CuAu±AgBiMoTeRe (SK) MoCu (S) Au±CuAg±MoPbZn (S)
Beyond copper, common metals found in sedimentary deposits are lead, zinc, cobalt and silver. Sedimentary copper can be deposited through different processes. However, the formation is the result
Mineral deposits formed as a consequence of sedimentary processes. Structural deformation may alter the form and attitude of some of these deposits. Lenticular masses, veins, lodes and zones of disseminated mineralization result from metamorphic processes. Recognition of the environment and existence of potentially economic mineral deposits may be based upon a
Disseminated deposits are those in which the metal is evenly distributed in generally low concentrations throughout large masses of rock. An important type of disseminated deposit is the porphyry copper deposit, in which copper and molybdenum are found in porphyritic intrusive rocks. Huge, low‐grade, multimillionounce disseminated gold deposits have been found in sedimentary rocks in Nevada.
Chemical differences in the fluids and the rocks, as well as physical differences in the rocks, create many different types of lode deposits. Over millions of years, gold flakes and nuggets worn away from veins are swept into bodies of water. The heavy gold settles in stream, lake and riverbeds, and on the sea floor, forming placer ("PLASSer") deposits. 1. Superheated waters emerge from
· Copper appears most frequently in deposits in which lead, silver, gold and zinc are also present. Porphyry copper deposits contain the most significant finds of copper; porphyry deposits began as large concentrations of molten rock that
Chemical differences in the fluids and the rocks, as well as physical differences in the rocks, create many different types of lode deposits. Over millions of years, gold flakes and nuggets worn away from veins are swept into bodies of water. The heavy gold settles in stream, lake and riverbeds, and on the sea floor, forming placer ("PLASSer") deposits. 1. Superheated waters emerge from
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· Copper appears most frequently in deposits in which lead, silver, gold and zinc are also present. Porphyry copper deposits contain the most significant finds of copper; porphyry deposits began as large concentrations of molten rock that slowly cooled, crystallizing inside Earth''s crust. During the cooling process, large crystals developed, with smaller ones forming around them; the smaller ones
of Fe, Cu, Zn, W, and other metals. The characteristic feature of these deposits is the gangue, a, generally darkweathering mixture of calcium and magnesium silicates, which has variously been termed skarn or tactite. Skarn deposits mOSt typicaliy are found replacing
If you live in an area that has water heavily treated with chemicals you will notice more mineral deposits. Hard water carries heavy amounts of calcium and magnesium. When these minerals are left to crystallize they form a whitish, powdery substance. There are other minerals that can also leave deposits on copper pipe. Manganese will leave a brownish black stain behind; high iron content will leave a white or ruddy
The characteristic feature of these deposits is the gangue, a, generally darkweathering mixture of calcium and magnesium silicates, which has variously been termed skarn or tactite. Skarn deposits mOSt typicaliy are found replacing limestone or dolomite beds adjacent to and above granitic intrusives.
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For instance, most copper today comes from deposits averaging as little as % Cu, whereas some 50 years ago the average copper ore contained about % Cu. Lower grades mean that more rock has to be mined, crushed, and treated for each unit of resulting ore concentrate.
An important type of disseminated deposit is the porphyry copper deposit, in which copper and molybdenum are found in porphyritic intrusive rocks. Huge, low‐grade, multimillionounce disseminated gold deposits have been found in sedimentary rocks in Nevada.
Spatially and (or) genetically related deposit types Associated deposit types (Cox and Singer, 1986) include porphyry copper (Model 17), iron skarn (Model 18d), polymetallic vein (Model 22c) and replacement (Model 19a), placer gold deposits (Model 39a), and distal disseminated silvergold (Model 19c; Cox, 1992). Potential environmental
This process is responsible for forming over half the world''s copper deposits. These magmatic fluids can also concentrate gold deposits, such as the Mother Lode of the Sierra Nevada, which was the
· Unravelling the causes of the distinctive chemical signatures has also brought new insights into the formation of porphyry copper deposits, and more generally the generation of the magmatic rocks
Porphyry deposits are the most important source of copper and molybdenum in British Columbia, the western United States, and Central and South America. Most porphyry deposits also host some gold, which may be, in rare cases, the primary commodity.
Volcanogenic Massive Sulphide (VMS) deposits are one of the richest sources of metals such as copper, lead, and zinc globally. VMS deposits can also produce economic amounts of gold and silver as byproducts of mining these deposits.
Metallic deposits are commonly found at both continental and arc convergent plate margins. Along the CircumPacific Belt major metallic deposits occur in western North and South America, Japan, Philippines, New Zealand and Indonesia. More than half of the world''s supply of copper comes from the Porphyry Copper Deposits of this region.
Pure chalcopyrite having % Cu metal in copper deposit and sphalerite with 67% Zn metal in zinc deposit are hosted by quartzite/mica schist and dolomite, respectively. The constituent minerals of quartzite, mica schist, and dolomite are called the gangue minerals.
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