Results 211 to 220 of about 4,263 (259)

Electronic Structure of Platinum-Group Minerals: Prediction of Semiconductor Band Gaps

Molecular Simulation, 1999
Abstract We report first-principle electronic structure calculations of the three representative minerals of the platinum group: cooperite (PtS), braggite (PdPt3S4) and sperrylite (PtAs2) using the Tight-Binding Linear Muffin Tin Orbital (TB-LMTO) technique.
D. Nguyen-Manh, P. S. Ntoahae, D. G. Pettifor, P. E. Ngoepe   +3 more
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Platinum Group Elements Mineralization

2020
Platinum group element (PGE) mineralization is associated with ultramafic and mafic rocks. There are three major types of PGE mineralization in Mongolia. The most common is (1) PGE mineralization related to ophiolites and includes podiform chromite, (2) PGE in layered gabbro intrusion, and (3) PGE-Au placer.
Baasandorj Altanzul, Ochir Gerel
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Platinum-Group Minerals from a Hydrothermal Environment

Economic Geology, 1974
Ore microscopy, paragenesis, two-temperature hydrothermal copper deposit, optical and physical properties, no X-ray data obtained; Messina, South Africa; see also this Bibliography, Cabri and Pickwick ...
P. Mihalik, J. B. E. Jacobsen, S. A. Hiemstra   +2 more
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Platinum-group minerals from the Troodos ophiolite, Cyprus

Mineralogy and Petrology, 1990
Platinum-group minerals have been identified in chromitites from the Troodos ophiolitic complex of Cyprus. The host chromitites occur as podiform bodies within the basal harzburgite of the ophiolite, as occasional discontinuous layers in the dunites at the base of the overlying cumulate sequence and rarely as minor schlieren in clinopyroxene dunites at
B McElduff, E. F. Stumpfl
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Platinum-group minerals in Tasmania

Economic Geology, 1981
Platinum-group minerals in Tasmania occur mostly in placer deposits and are composed mainly of iridosmine and rutheniridosmine. Platinum-rich alloys are rare. Silicate inclusions in the metals include olivine (Fo (sub 94-89) ), enstatite, and nonstoichiometric pyroxene rich in Ca, Mg, and Al.
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Platinum-group minerals within the Ballantrae Complex, SW Scotland

Scottish Journal of Geology, 2004
Synopsis Platinum-group minerals (PGM) are present within the chromitites of the northern serpentinite belt (Pinbain Bridge area) of the ophiolitic Ballantrae Complex. A relatively uncommon but moderately diverse PGM assemblage is dominated by small (<10 μm) Ir-, Os-, or Ru-bearing phases including laurite (RuS 2
M. R. Power, D. Pirrie
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Platinum-group minerals in the Hitura nickel deposit, Finland

Economic Geology, 1976
The northern part of the Hitura serpentinite-peridotite body contains Ni-Cu mineralization whose grade is highest in the contact zone. Pt metals average 0.027 g/ton Pt and 0.048 g/ton Pd in the ultramafic body. A detailed microscopic, microprobe, and analytical study of the Pt metals and minerals reveals that sperrylite is the only independent Pt ...
T. A. Hakli, E. Hanninen, Y. Vuorelainen, H. Papunen   +3 more
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Platinum-group minerals in alpine chromitites from southwestern Oregon

Economic Geology, 1984
Electron microprobe and scanning electron microscopy. The platinum-group minerals found in the chromitites are laurite, porous Ru-rich alloys, Os-Ir- and Pt-rich alloys with highly variable compositions, an Ir-Cu-rich sulfide, a Pt arsenide, and three relatively rare platinum-group sulfides.
Harlan W. Stockman, Paul F. Hlava
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Platinum-Group Minerals from the Durance River Alluvium, France

Mineralogy and Petrology, 1990
Platinum-group minerals were discovered, during gold recovery, in the Durance river alluvium, near Peyrolles (Bouches-du-Rhone). The PGM grains (average size 130 microns) are strongly flattened (average thickness 64 microns). The PGM concentrate consists primarily of (Pt, Fe) alloys (92%), (Os, Ir, Ru) alloys (3.5%), and native gold and (Au, Cu, Ag ...
Z. Johan, M. Ohnenstetterl, M. Fischer, J. Amoss�   +3 more
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Electrochemical interactions of platinum group minerals with copper sulphate

Minerals Engineering, 2017
Abstract Activation of sulphide minerals by copper sulphate is common practice on platinum group mineral (PGM) concentrators. However, the role of copper sulphate in the flotation of PGMs is still unclear especially in the case of those PGM ores which contain relatively low concentrations of sulphides.
M. Tadie, K.C. Corin, J.G. Wiese, C.T. O'Connor   +3 more
openaire   +1 more source