 | | Journal (article/letter/editorial) | | Origin of Platinum-Bearing Placers in the Aluchin Horst, Russian Far East STANISLAV S. GORNOSTAYEV,†...109017, Russia Abstract The Quaternary gold–platinum-group mineral (PGM) placers of the Aluchin horst, western...western Chukotka, Russian Far East, contain PGM (mostly Pt-Fe alloys) typical of those associated with...rocks. They form the primary source of PGM. The PGM placer nuggets vary considerably in size (0.1–9 mm), shape...degree of abrasion, indicating a long history of placer-forming processes. Some of the nuggets are covered |  | | Journal (article/letter/editorial) | | sorosite from the Baimka Au–PGE placer deposit, western Chukotka, northeastern Russia. It occurs as (1)...diorite – syenite – monzonite complex in the placer area could be a potential primary source for the sorosite-bearing...mechanisms of substitution, gold–PGE placer deposit, Baimka, Chukotka, Russia. SOMMAIRE Nous présentons...groupe du platine de type placer de Baimka, partie occidentale de Chukotka, dans le nord-est de la Russie...associée au massif de gabbro – diorite – syénite – monzonite de Yegdegkychsky, dans la région du placer, pourrait |  | | Report (issue) | | = 5.120(6) Z=2 X-ray Powder Pattern: Baimka placer, Russia. 2.970 (10), 2.094 (9), 2.112 (8), 1.487...56.12 7.89 Total 99.46 [100.00] (1) Baimka placer, Russia; by electron microprobe, average of nine...Sb0.12 )Σ=1.00 . Occurrence: Very rare, in a gold-PGE placer probably derived from Alaskan-type complexes...formed under low-sulfur reducing conditions (Baimka placer, Russia); in concentrates from precious metal placers...lead (Baimka placer, Russia); tin, stistaite (Rio Tamaná, Colombia). Distribution: From the Baimka gold-PGE |  | | Report (issue) | | a = 4.15 Z=1 X-ray Powder Pattern: Elkiaidai River, Uzbekistan. 3.09 (10), 2.19(10), 1.374 (8), 1.253(7)...Total 100.0 [100.00] 100.51 100.00 (1) Elkiaidai River, Uzbekistan; by electron microprobe; corresponds...84%; corresponds to Sn1.12 Sb0.87 . (3) Baimka placer, Russia; by electron microprobe, corresponds to...concentrates from placer deposits from a region of Silurian shaly-sandy sediments (Elkiaidai River, Uzbekistan);...(Elkiaidai River, Uzbekistan); tin, sorosite, herzenbergite, cassiterite, lead (Baimka placer, Russia) Distribution: |  | Cabral, A. R., Lehmann, B., Kwitko-Ribeiro, R., Costa, C. H. C. (2002) Palladium and platinum minerals from the Serra Pelada Au-Pd-Pt deposit, Carajas mineral province, northern Brazil. The Canadian Mineralogist, 40 (5) 1451-1463 doi:10.2113/gscanmin.40.5.1451 | Journal (article/letter/editorial) | | PLATINUM MINERALS FROM THE SERRA PELADA Au–Pd–Pt DEPOSIT, CARAJÁS MINERAL PROVINCE, NORTHERN BRAZIL ALEXANDRE...(1980–1984) was the site of the most spectacular gold rush in recent history, but the mineralogy of the...lateritic portion of the garimpo area, has provided coarse-grained gold aggregates for this study. The...The centimeter-long aggregates of gold occur in powdery, earthy material. They exhibit a delicate arborescent...goethite. Four compositional types of gold are recognized: palladian gold with an atomic ratio Au:Pd of 7:1 |  | | Journal (issue) | | border. For detailed information on the mines and district,I suggest Howard (1979),and for a recent summary...of the many species at this contact-metamorphic deposit. She also collected specimens of the same species...valuable to one who studies the paragenesis of a deposit. Some collect indiscriminately, which is fine when...1987). References Howard, J. M, 1979, Antimony district of Southwest Arkansas: Arkansas Geol. Comm., lrrfo...collecting microminerals in the Arkansas antimony district Rocks & Minerals,71:134-137. November 1998 ----- |  | | Journal (article/letter/editorial) | | 1687-1710 (2005) PLATINUM-GROUP MINERALS FROM FIVE PLACER DEPOSITS IN BRITISH COLUMBIA, CANADA ANDREI Y....(PGM) from a selected suite of gold- and platinum-group-element (PGE) placer deposits in British Columbia...analyzed using the electron-microprobe (EMP). The PGM placer grains (n = 70, 0.1–1.5 mm in size) principally...Pt and poor in Fe, observed at the boundary of placer Pt–Fe alloy grains, provide evidence for a removal...affinities, compositions and associations of the placer PGM examined appear consistent with two types of |  | | Journal (issue) | | rediscovered the Moctezuma mine that was first opened for gold in 1937. This mine, though small, provided many...GAINES, R. V. (1970) The M octezuma tellurium deposit. Mineral ogical Record, 1, 40-43. MITCHELL, R...Axinite (Brazil), Green River (WY) $10 v.8/#6 California Issue Benitoite, Gold L.A. County Museum, Himalaya...Kalahari rhodochrosite, Paterson (NJ), Brumado district (Brazil), Bosch Collection $10 v.9/#4 Elmwood...Arsenopyrite (Ont.) Author’s Guide $10 v.18/#1 Gold-II Issue! Australia, Calif., Breckenridge, Hopes |
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