1. Introduction. Iron oxide-copper-gold (IOCG) deposits are one of the main sources of copper (Cu) and gold (Au) in the world. Since the discovery of giant Olympic Dam deposit in Australia, the IOCG deposit category has attracted considerable attention (Hitzman et al., 1992).The understanding of IOCG deposits has gradually deepened …
Magnetite (Fe 3+ [Fe 2+ Fe 3+]O 4) is one of the most abundant oxide minerals of the spinel group in the earth's crust.It is also a common accessory mineral in igneous rocks, metamorphic rocks and sedimentary rocks, and distributes in various types of deposits as major or minor component (Righter et al., 2006, Nadoll et al., 2014, …
The Labrador Trough contains world-class iron deposits which have been mined since 1954. The direct shipping of Knob Lake ores were mined at Schefferville from 1954 to 1982. Concentrate production ...
The Mont Klahoyo magnetite deposit is located about 600 km northwest of Abidjan, Ivory Coast. During an exploration period ending in 1977 an international joint venture group …
Composition: Iron ore is primarily composed of iron, usually in the form of iron oxides such as hematite (Fe2O3), magnetite (Fe3O4), or goethite (FeO(OH)). It may also contain other elements or minerals as impurities, such as silica, alumina, phosphorus, sulfur, and trace elements.; Physical properties: Iron ore is usually hard, dense, and …
In this study, we report the results of deep-sea magnetic vector field measurements in a hydrothermal deposit called the Hakurei site, in the middle Okinawa …
The Mont-Wright and Fire Lake mines are part of the highly-folded and metamorphosed southwestern branch of the Labrador Trough. The most important rock type in the area is the specular hematite iron formation forming wide, massive deposits that often form the crest of high ridges extending for many kilometers in the Quebec Labrador area.
Type I magnetite is subhedral to anhedral from massive Ni- (or Fe-) and Cu-rich sulfide ores, with apparent magmatic origin, whereas Type II (dendritic or laminar crystals) and III magnetite ...
Titaniferous magnetite deposits are magmatic accumulations of magnetite and ilmenite. They commonly contain 0.2 to 1 percent V 2 0 5, most of which is concentrated in the magnetite, and they have become the world's principal source of vanadium. These deposits are mostly associated with mafic igneous rocks
Type 3 magnetite is of hydrothermal fluid origin, with low δ 56 Fe (0.29 ‰ to 0.41 ‰) and Ni (177 ppm to 377 ppm). Magnetite composition and Fe isotope …
In recent years, magnetite trace elements have increasingly been applied in studies into ore deposits. The magnetite trace element characteristics of different deposit types have been summarized ...
In addition, magnetite in IOCG deposits commonly occurs as two different forms, i.e., mushketovite (a kind of platy magnetite that is formed by replacing specular hematite.) and granular magnetite ...
Magnetite is a mixed iron(II)/iron(III) oxide and its magnetism, hardness, density and catalytic properties combine to generate its importance.Massive deposits of magnetite were formed around 2 ...
The Magnetite project in South Africa is strategically located in the picturesque Limpopo Province of South Africa. Its focal point is the Rhenosterkoppies Greenstone Belt (RGB), an ancient early Proterozoic crust that holds significant iron mineralisation, particularly magnetite. Although some historical regional-scale mapping exploration work ...
The Central Asian Orogenic Belt (CAOB) extends from the Tarim–North China Craton in the south to the Siberian Craton in the north (Fig. 1 a; Jahn et al., 2000, Wilhem et al., 2012, Deng and Wang, 2016) and is the world's largest Phanerozoic accretionary orogenic system (Xiao et al., 2013, Han and Zhao, 2018).The CAOB is a …
The Pilbara region of Western Australia is well known for its abundant exports of hematite-goethite deposits, which have been mined and exported since the 1960s. Magnetite has also been mined in Australia throughout this period, although historically of much lower production volumes (WA Iron Ore profile, 2016). Magnetite offers a source supply of …
Report issued by the Bureau of Mines over the Iron Mountain magnetite deposits. As stated in the introduction, "magnetic, gravity, and geologic surveys were made to permit an estimate of the extent and magnitude of the Iron Mountain, Colorado, titaniferous magnetite deposit" (p. 1). This report includes tables, maps, and illustrations.
The Mont-de-l'Aigle deposit is located in the northern part of Dome Lemieux, in the Connecticut Valley-Gaspé Synclinorium, Gaspé Peninsula, Québec. The Dome Lemieux is a subcircular antiform of Siluro–Devonian sedimentary rocks that is cut by numerous mafic and felsic sills and dikes of Silurian to Late Devonian age. Plutonism …
Iron oxide-apatite (IOA) deposits are an important source of iron and other elements (e.g., REE, P, U, Ag and Co) vital to modern society. However, their formation, including the namesake Kiruna-type IOA deposit (Sweden), remains controversial. Working hypotheses include a purely magmatic origin involving separation of an Fe-, P-rich, volatile-rich oxide …
The Mont-Wright deposit is 30 km SW of Scully, and 15 km WSW of the toen of Fremont, and is hosted by the equivalent Bloom Lake ironstone. The host ironstone is 300 m thick unit, which can be traced over a 2000 m strike length and has been explored to a depth of 300 to 400 m below the surface. It consists of tabular to folded and anastomosing ...
Magnetite-carbonate BIF, in which there is clear evidence of hydrothermal replacement of chert by carbonate, forms distinctive magnetite-goethite ore with magnetite locally persisting to the surface. Mount Gibson shows clear evidence of the formation of high-grade ore by this process but also contains high-grade hematite ore and chert-free …
Magnetite is the main constituent of iron oxide–apatite (IOA) deposits, which are a globally important source of Fe and other elements such as P and REE, …
The Abagong deposit is located in the southeastern Kelang basin, about 30 km southeast of the Altay town.It has a reserve of 8.4 Mt of magnetite and the grade of Fe 2 O 3 varies from 44.18 wt.% to 67.21 wt.%. The apatite is a by-product and the grade of P 2 O 5 varies from 3.8 wt.% to 10.8 wt.%. The main mineral constituents in the deposit …
Lakes, Rivers, Creeks, and Mountainous Regions. Lakes, creeks, and rivers are the second-best places to find natural magnetite. This is because certain types of bacteria also form magnetite. When the …
The Novogodnee–Monto deposits is situated in a regional belt of magnetite skarn and Cu–Au porphyry deposits and incorporates a significant Au …
The El Laco magnetite deposit has been interpreted as lava flows and feeder dikes formed from iron oxide magma, but more recently, as a product of metasomatic replacement. Open-pit exposure created … Expand. 153. Save. Magmatic Features of Iron Ores of the Kiruna Type in Chile and Sweden: Ore Textures and Magnetite Geochemistry.
The Longqiao Fe deposit is the only large stratabound Fe skarn in Eastern China. This extensive ore body is suitable for investigating the spatial variations in trace elements in magnetite from the intrusion to the wall rocks and tracing the evolution of the mineralizing fluid in a skarn deposit. Magnetite samples were collected every 200 m …
The Zhaoanzhuang iron deposit in the southern North China Craton consists of abundant uncommon serpentine–magnetite ores, with an ore reserve more than 130 Mt (≥40% Fe).The ore is composed of low-Ti magnetite (TiO 2 ~0.1%), high-Mg serpentine (Mg # = 92.42−96.55), and minor amounts of dolomite, apatite, anhydrite, and gypsum …
Several deposits of highly metamorphosed magnetite-specularite iron formation are located west of Ungava Bay. Numerous studies have shown that this medium- to fine-grained iron formation can be beneficated to 66% to 68% iron. In the area from Wabush Lake to Mont-Wright, a medium- to coarse-grained friable specularite-quartz …
The new temperature data for magnetite presented here are consistent with a magmatic-hydrothermal origin for Andean IOA deposits. The magnetite thermometry data agree with δ 56 Fe and δ 18 O ...
Oxygen isotopic data for the massive magnetite (δ 18 O: 4.3‰–5.0‰) and the alkali-calcic altered rock (diopside δ 18 O: 7.2‰–8.7‰; magnetite δ 18 O: 4.4‰–6.7‰) suggest that these rocks are genetically related to the host andesite (δ 18 O: 7.4‰–9.6‰). The estimated temperature of the mineral assemblage (>∼900 °C ...
The El Laco magnetite deposit has been interpreted as lava flows and feeder dikes formed from iron oxide magma, but more recently, as a product of metasomatic replacement. Open-pit exposure created at Laco Sur during the 1990s reveals that the massive magnetite contains magnetite-veined blocks and smaller fragments of altered …
The Mont Klahoyo magnetite deposit is located about 600 km (373 miles) northwest of Abidjan, Ivory Coast. During an exploration period ending in 1977 an international joint …
The Beiya gold deposit (323t of gold @ 2.47 g/t) is located in the centre of the Jinshajiang-Ailaoshan potassium alkaline porphyry Cu-Au metallogenic belt in SW China, which is the largest skarn gold deposit in China. ... As the dominant ore mineral at Beiya, magnetite has been selected as a petrogenetic indicator to understand the ore …