In Ethiopian steelmaking, three kinds of iron ore were mined, and the craftspeople were clearly able to select the most appropriate ore for a given project, without explicidy understanding the …
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-striking, steeply …
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 still absent ...
Generally, the study area is characterized by hydrothermal alterations with many vertical and lateral variations. At the deposit scale, the alterations display a clear zonation of mineral assemblages and were broadly synchronous with the mineralization. These alteration facies are arranged around the ore body, mainly in footwall rocks.
chapter 3: oxygen isotope compositions of iron oxides 29 from high-grade bif-hosted iron ore deposits of the central hamersley province,western australia: constraints on the evolution of hydrothermal fluids. chapter 4: structural control, …
This genetic framework of environments of formation of advanced argillic alteration helps to interpret alteration mineralogy plus its morphology and zonation during exploration and assessment of ...
from a shoot of hessite-rich telluride ore, the distal equivalent of calaverite-rich ore in the Golden Mile (Mueller and Muhling 2013). The lode terminates at 120 m depth at a D3 (?) reverse fault (Feldtmann 1916). The Golden Dream Lode, mined over a strike of 180 m, is the only one located in altered greywacke of the Golden Mile Fault (Fig.2).
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. Steeply E to …
102 alteration zone close to the massive ore body led early workers to suggest that these sulfides are a 103 result of epigenetic mineralization and were formed by the hydrothermal replacement of pre-
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 ...
alterations initiating throughout the Tulu Kapi syenite are in the form of in enechelon vein ... iron ore, bauxite and etc. (Tadesse, 2003). Au mineralization is usually spatially and temporally related to granitoids (Hart et.al., 2004, Goldfarb et.al., 2005). In Ethiopia a number of placer gold occurrences, as well as the Lega Dembi primary ...
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 ...
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.
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 iron deposit was …
Ethiopia Nears First Iron Ore Plant. The first private iron ore mining plant is to kick off in Mekaneselam, Wollo Zone in northcentral Ethiopia. Agodo YO is investing between USD150 and 200 million to install a medium-scale iron ore processing …
of iron, whi ch is caused by organic acids derived from decaying vegetation. Laterite zonation is due to the effect of seasonal changes betw een dry and wet
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
Ethiopia has most of the resource materials required for steel production, including iron ore, coal, limestone, and others. Ethiopia has an estimated 350 million metric tons deposits of iron ore …
chapter 3: oxygen isotope compositions of iron oxides 29 from high-grade bif-hosted iron ore deposits of the central hamersley province,western australia: constraints on the evolution of hydrothermal fluids. ... structural control, hydrothermal alteration zonation 47 and fluid chemistry of concealed, bif-hosted high-grade 4ee iron ore body at ...
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 investigated and sampled.
Primary mineralogy, gangue minerals and ore assemblages are all affected. Iron oxides, oxyhydroxides and sulphates derive from decomposition of Fe-bearing sulphides. ... Alteration zonation model of a gold-rich porphyry copper system with maximal development of a biotite–magnetite assemblage in the potassic zone. There is no vertical ...
It has been recognized for the past century that copper deposits, in common with those of many other metals, are heterogeneously concentrated in Earth's upper crust, resulting in areally restricted copper provinces that were generated during several discrete metallogenic epochs over time intervals of up to several hundred million years.
synergetic use of the sentinel-2, aster, and landsat-8 data for hydrothermal alteration and iron oxide minerals mapping in a mine scale August 2020 Acta Geodynamica et Geomaterialia 17(3):311-328
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-striking, steeply SW …
rences in Ethiopia: - Ethiopia has significant iron ore resources due to various deposit types formed through geological processes like sedimentation, metamorphism, and magmatism. - The major iron ore occurrences are found in the Wollega, Bale, Kefa, and Hararghe regions and include deposits like Bikilal, Gordana, and Cherecher. - Iron is essential for steel production …
The mapping of hydrothermal alteration zones associated with mineralization is of paramount importance in searching for metal deposits. For this purpose, targeting alteration zones by analyzing airborne geophysical and satellite imagery …
1996. The secondary mineralogy of altered diabase in the lower sheeted dikes cored during Leg 148 comprises an earlier hightemperature assemblage of amphibole, diopside, anorthitic plagioclase, chlorite, titanite, and apatite, overprinted by a subsequent alteration at lower temperatures that led to actinolite, albite, chlorite or chlorite-smectite, talc, epidote, and …
Our previous study has identified the detailed alteration zonation from proximal to distal for the high‐grade iron ore body, based on hyperspectral images of wall rocks [18],
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 …
Spectral Alteration Zonation Based on Close Range HySpex-320 m Imaging Spectroscopy: A Case Study in the Gongg High-Grade Iron Ore Deposit, Liaoning Province, NE China ... In this paper, a typical profile of a high-grade iron ore body in Gongg iron deposit was investigated and sampled. The samples were checked by polarized ...
In Ethiopia, the most important primary iron ore deposits are associated with the upper successions of Precambrian rocks (Tadesse, 2009). Weathering and alteration of the …
In Ethiopia, the most important primary iron ore deposits are associated with the upper successions of Precambrian rocks (Tadesse, 2009). ... (97.96–99.97%) and Chemical Index of Alteration (76. ...