Most deposits of platinum group elements (PGE), chromite, and vanadiferous magnetite occur in mafic intrusions. Several represent some of the most laterally continuous and uniform, in terms of grade and thickness, of all orebodies. ... chromite, or independently, or it may postdate silicate accumulation, having been …
New and recently published platinum-group element data of chromite-rich layers in the Bushveld Complex are evaluated. Chondrite-normalized platinum-group element plots of …
The massive chromite deposit in the Ring of Fire follows a 12 km strike-length. Each mining company seems to have a portion of this deposit, which remains to be fully explored. In the world of chromite mining, the Ring of Fire, if developed in an economically sustainable manner, will be a game changer.
Chromite-rich seams within layered intrusions host the majority of the world's chromium reserves and may contain significant platinum-group-element (PGE) mineralization. This model of stratiform chromite deposits is part of an effort by the U.S. Geological Survey's Mineral Resources Program to update existing models and develop …
K EYWORDS: platinum-group elements, ore deposits, chromite, sulfide, Bushveld Complex 1811-5209/0004-0253$2.50 DOI: 10.2113/ GSELEMENTS .4.4.253 formation of intraplate picritic magmas.
Podiform chromitite samples in the harzburgite zone show elevated Ir and Ru values, similar to the levels of enrichment of these platinum group elements (PGE) …
DOI: 10.1016/0375-6742(90)90086-P Corpus ID: 129702993; Platinum-group element abundance and distribution in chromite deposits of the Acoje Block, Zambales Ophiolite Complex, Philippines
The Merensky-type platinum deposits occur as thin, continuous layers of sulphide- and chromite-bearing silicate rocks anomalously enriched in the platinum group elements (PGE; Os, Ir, Ru,...
Platinum-Nickel-Chromium Deposits: Geology, Exploration, and Reserve Base is the first reference book to combine information on the discovery of numerous minerals within existing deposits. This book recognizes the close affinity and great natural coexistence of platinum, palladium, chromium, nickel, copper, gold, and silver hosted by unique …
gold, platinum, chromite, uranium, manganese, vanadium, tantalum and cobalt and industrial minerals ... In contrast, the mining sector in Nigeria, is virtually "non-existent", and only ...
Although the chromitites are small, the abundance of platinum can be quite high. For example, at the Krutoy Log deposit, chromite-platinum ore at the top of the orebody extended for a distance of 2 m in one adit. From this small volume of rock, about 30 kg (reported as 965 troy ounces) of native platinum metals was recovered (Mertie, …
Empirical evidence supports theoretical considerations that chromite and magnetite precipitation may be particularly conducive to trigger sulfide melt saturation, due to a pronounced decrease in FeO content of the magma. ... Deposits containing Ni, Cu and platinum-group elements (PGE) are usually associated with mafic and ultramafic rocks. …
Laurite is the most common platinum-group mineral and is mostly enclosed by chromite. A variety of other platinum-group minerals occur in close association with base metal sulfides. Extremely low bulk sulfur content in the chromitite layers is ascribed to a postcumulus loss of sulfur.
Ores of iron, tin-niobium-tantalum deposits, and precious metals in the Nigerian basement complex are predominantly associated …
The minor podiform chromite model has a median tonnage of 100 metric tons and a mean grade of 43 percent Cr 2 O 3. The banded podiform chromite model has a median tonnage of 650 metric tons and a mean grade of 42 percent Cr 2 O 3. Observed frequency distributions are also given for grades of rhodium, iridium, ruthenium, …
DOI: 10.1016/J.OREGEOREV.2016.06.022 Corpus ID: 132878954; An overview of the platinum-group element nanoparticles in mantle-hosted chromite deposits @article{GonzlezJimnez2017AnOO, title={An overview of the platinum-group element nanoparticles in mantle-hosted chromite deposits}, author={Jos{'e} Mar{'i}a …
PGE's and chrome deposits are usually associated with large mafic intrusives many of these are layered. The general rule is the bigger the intrusion the better you need the large intrusions to provide …
Rock samples from about 280 podiform chromite deposits in California and Oregon were analyzed for Pt, Pd, Rh, and Ir by fire assay-atomic absorption and spectrographic techniques to estimate by-product platinum-group element potential of chromite mining. These deposits include ophiolites from the Sierra Nevada, Klamath Mountains, Coast …
The value of mineral wealth that has been exploited in Africa in the past 100 years is estimated at over 10 trillion dollars. Most of the metallic deposits are concentrated in Central and Southern Africa, except for bauxite, iron ores, and phosphate in western Africa. Nigeria is Africa's most populous nation and the largest economy, rich in ...
The deposits are characteristically dominated by the platinum group of elements (PGEs), nickel, or chromite, and/or in ratio of main/byproducts. The world reserve base of PGE metals is estimated at 66,110 tonnes (∼72,870 tons), 95% contributed by single source of Bushveld Complex, South Africa, that can supply for the next century.
A new descriptive stratiform chromite deposit model was prepared which will provide a framework for understanding the characteristics of stratiform chromite deposits worldwide. Previous stratiform chromite deposit models developed by the U.S. Geological Survey (USGS) have been referred to as Bushveld chromium, because the Bushveld Complex …
In nickel production, there are 9 provinces identified as producers of nickel in the Philippines. Similarly, there are 3 provinces in Copper production and 2 provinces in Chromite Production. These data were then turned into a thematic map using QGIS. Upon completion of data collection, relevant shapefiles and datasets were obtained and created.
In that sense, the findings of the present investigation of chromite purity and mineral structure is a prerequisite for future exploitation of the Aetoraches chromite deposits in particular and ...
The investigation of stable and radiogenic isotopes and of platinum-group (PGE) and rare earth elements (REE) in chromitites and associated ultramafic rocks of the Kempirsai Massif, southern Urals, gives strong evidence for a multistage formation of giant ophiolitic-podiform chromite deposits present in the southeastern part of the massif. The …
The major platinum mineral is isoferroplatinum, followed by minor tetraferroplatinum and tulameenite, and rare ferronickelplatinum. ... Ir, and Pt in base-metal sulfides from the Caridad chromite deposit, Cuba American Mineralogist. Ophiolite-related associations of platinum-group minerals at Rudnaya, western Sayans and Miass, …
The platinum group minerals (PGM) in chromite ores of the Kempirsai ophiolite massif, located south of the Ural Mountains, are extremely varied in composition and represented predominantly by alloys, sulfides, arsenides, and sulfosalts of the iridium-group PGE (IPGE). The earlier Ir-Os-Ru alloys prevail over the later Cu-Os-Ru, Cu-Ir, Ni …
Of these, 619 deposits have been used to create three new grade and tonnage models for podiform chromite deposits. The major podiform chromite model has a median tonnage of 11,000 metric tons and a mean grade of 45 percent Cr 2 O 3. The minor podiform chromite model has a median tonnage of 100 metric tons and a mean …
Most studies on the distribution of noble metals have focused on magmatic ore deposits where discrete micron-size inclusions of platinum-group elements (PGEs) have been observed in chromite grains ...
The present work reviews assemblages of detrital platinum-group minerals (PGM) in placers worldwide with the aim of identifying common and distinctive features …
Crystallisation of basic magmas can be accompanied by syngenetic concentration of ore minerals, which can lead to the formation of economic ore deposits of chromite, titanian magnetite, ilmenite, pentlandite, chalcopyrite and platinum-group minerals (PGM). Two modes of ore formation are of particular significance: 1. 2.
This paper reviews the occurrence of platinum-group elements nanoparticles (PGE-NPs) in mantle-hosted chromite deposits, showing that PGE-NPs are more frequently found in these deposits than previously thought. A comparison of published experimental data with observations in natural samples reveal that PGE-NPs might form …
Crystallization and deposition of chromite in a flow-through system, analogous to the lava channels and magma conduits that host magmatic Ni–Cu–platinum group element (PGE) deposits (e.g., Lesher et al., 1984; Lesher, 1989; Arndt et al., 2008), which are inferred to have processed two to three orders of magnitude more magma than the amount ...
Platinum-group elements (PGE) occur in ore-grade concentration in some of the chromite deposits related to the ultramafic section of the Acoje Block of the Zambales Ophiolite Complex. The deposits are of three types: Type 1 - associated with cumulate peridotites at the base of the crust; Type 2 - in dunite pods from the top 1 km of mantle harzburgite; …
