In Ethiopia, the most important primary iron ore deposits are associated with the upper successions of Precambrian rocks (Tadesse, 2009). Weathering and …

Skarn deposits are variably zoned, with a common zonation pattern of magnesian, calcic and manganesian skarn from the proximal to distal zones [1, 23, 41].Yu et al. [] showed that the Galinge skarn iron deposit has the typical magnesium-skarn (Mg-SK), calcium-skarn (Ca-SK) and manganese-skarn (Mn-SK) zonation.In general, …

Structure is the most important control on the location of hematite deposits in the Hamersley Province in the Pilbara region of Western Australia. Unravelling the structural history of mineralised areas, however, is complex because the Province underwent three orogenic events, and three regional extension events followed the main episodes of compression. …

High-grade iron ore of the 4EE orebody of the 4E deposit (>200 Mt at 63.5 wt % Fe) occurs as a southerly dipping sheet within banded iron formation (BIF) of the Paleoproterozoic Dales Gorge and Joffre members of the Brockman Iron Formation. ... T1 - Structural control, hydrothermal alteration zonation, and fluid chemistry of the concealed, high ...

Three types of iron occurrences including a magmatic iron (Fe–Ti type), banded iron formation (BIF) and secondary iron (lateritic) ore deposits have been reported in Ethiopia (Tadesse, 2009). Among them, lateritic iron deposit is significant in terms of volume, occurrence and minability (Bheemalingeswara and Solomon, 2012).

The geotectonic areal division sketch map of Duolong porphyry copper ore field (a); an ASTER false-color composite image of b6(R), b3(G) and b1(B) (b); the geological sketch of Duobuze and Bolong ...

Iron oxide copper-gold (IOCG) deposits form in spatial and genetic relation to hydrothermal iron oxide-alkali-calcic-hydrolytic alteration and thus show a mappable …

Early Tertiary formations show potential possibilities for lignite, opal, oil shale, lateritic iron ore. Bentonites, industrial clay minerals, perlite and pumice are common. …

high-grade iron ores formed along steep normal faults (Taylor et al, 2001). Ore formation can be ascribed to leaching of silica (chert) from iron-formations and recrystallisation of other iron mineral

Iron oxide copper-gold (IOCG) deposits form in spatial and genetic relation to hydrothermal iron oxide-alkali-calcic-hydrolytic alteration and thus show a mappable zonation of mineral assemblages ...

High-grade iron ore of the 4EE orebody of the 4E deposit (>200 Mt at 63.5 wt % Fe) occurs as a southerly dipping sheet within banded iron formation (BIF) of the Paleoproterozoic Dales Gorge and ...

Research on wall rock alteration is of great importance to the understanding and exploration of ore deposits. The microscopic changes of the same mineral in different alteration zones can provide information about the migration and enrichment of ore-forming elements. In this paper, a typical profile of a high-grade iron ore body in Gongg …

High-grade iron ore of the 4EE orebody of the 4E deposit (>200 Mt at 63.5 wt % Fe) occurs as a southerly dipping sheet within banded iron formation (BIF) of the Paleoproterozoic Dales Gorge and Joffre members of the Brockman Iron Formation. Structural reconstruction of the 4E deposit shows that reactivation of the 18E fault and development of the NW …

Argillic alteration and other types of hydrothermal alteration are common near the ore deposits and many of the intrusive and extrusive bodies such as metagabbros, granodiorites, and rhyolites ...

Previous research of the Honghai Cu-Zn deposit has focused on its ore geology, age and isotopic geochemistry (Mao et al., 2010, Mao, 2014, Mao et al., 2015, Mao et al., 2016, Deng et al., 2016, Deng et al., 2018), yet detailed studies on alteration mineralogy, alteration zonation, mineral paragenesis, SWIR and mineral chemistry are …

The largest high-grade iron ore body RI in Gongg iron deposit (Figure2): located in the sixth layer of iron ore, occurring in the strike fault, it accounts for 58.5% of total reserves of high-grade iron ore. The length of the ore body is 2840 m along the strike, with elevation generally below 500 m.

The data of Rouxel et al. (2003) indicate that during alteration of oceanic basalts, isotopically light iron is preferentially leached, transported in the fluid and then deposited in hydrothermal Fe–Si deposits, whereas the isotopically heavy iron remains mainly in the basaltic alteration products such as celadonite. This was attributed to a ...

The zonation in Au-Cu-chalcocite-bornite-chalcopyrite-pyrite is the result of a low-T, very acidic, SO4-bearing ore fluid. Our alteration models involving Fe-Na-K-Cl-rich and CO2-H2S-bearing ...

High-grade iron ore of the 4EE orebody of the 4E deposit (>200 Mt at 63.5 wt % Fe) occurs as a southerly dipping sheet within banded iron formation (BIF) of the Paleoproterozoic Dales Gorge and ...

This study uses visible-shortwave infrared and thermal infrared ASTER data together with surface material spectra from the Duolong porphyry copper ore district to construct an RS-based alteration zonation model of the deposit. In this study, an RS alteration zoning model is established based on ground-spectral alteration zoning results.

Magnetite is a common mineral in the Paleoproterozoic Stollberg Zn–Pb–Ag plus magnetite ore field (~6.6 Mt of production), which occurs in 1.9 Ga metamorphosed felsic and mafic rocks.

The ore body presents in vein-like structures, with mineralization associated with alunite-dickite alteration in the upper part and with dickite-sericite alteration in the lower part. Ore minerals consist of covellite, digenite, pyrite, chalcopyrite, tenantite and bornite. (Zhang et al., 1996). Previous studies have noted the development of ...

Our mineral mapping approach shows that the hydrothermal alteration resulted in a characteristic zonation of minerals radiating outward from the pipe-shaped orebody. The mineral zonation is the result of a sequence of sodic alteration followed by potassic alteration, brecciation, and, finally, by hydrolytic (acid) alteration.

Based on these findings, we propose the involvement of episodic magmatic-hydrothermal fluids in the ore genesis of the Kiruna iron ore deposits: (1) the first episode related to a deep-seated magmatism and to regional-scale metasomatic alteration, and (2) a later fluid event related to shallow intrusions and responsible for the ore formation.

The microscopic changes of the same mineral in different alteration zones can provide information about the migration and enrichment of ore-forming elements. In this paper, a typical profile of a high-grade iron ore body in Gongg iron deposit was …

Download scientific diagram | Location map of iron ore occurrences and Deposits of Ethiopia from publication: ENHANCEMENT THE PRODUCTION OF SIDEROPHORES …

The Kahang deposit has been classified as a typical porphyry Cu-(Mo) deposit based on its host rock features, tectonic setting, alteration zonation, mineralization style, ore grade and tonnage ...

The alteration types in the mining area, from deep to shallow, include an albite alteration zone, a biotite-albite alteration zone, a chlorite alteration zone and a sericite-pyrite alteration zone.

The most common oxidation alterations are change of magnetite and ilmenite to hematite or limonite. Sulfide minerals often weather easily because they are susceptible to …

Petrological and geochemical studies at both the Southern Ridge and the North deposit at Mt Tom Price have identified three hypogene alteration zones between unmineralised BIF and high-grade iron ore: distal magnetite-siderite-stilpnomelane; intermediate hematite-magnetite-ankerite-talc-chlorite; and proximal martite-microplaty hematite ...