deposit

THE DISCOVERY OF TANGSHANG AU DEPOSIT OF AU POLYMINERALIZATION,GUANGNA

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THE DISCOVERY OF TANGSHANG AU DEPOSIT OF AU POLYMINERALIZATION,GUANGNA by Yang Chang-hua.

Various usual metallogenetic types of Dian-Qian-Gui Au triangle region are concentrated in an area less than 10 km~2,ie,Au deposit micro-fine dissemination;Au on unconformity(Dachang Bed);Au basic volcanite;Au volcanic clastic sedimentary type;Au quartz vein type;and placer present river sediment,which have different ore guide.

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Uranium in Todilto Limestone–Sabkha-Like Deposit: ABSTRACT

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Uranium in Todilto Limestone–Sabkha-Like Deposit: ABSTRACT by Richard R. Rawson.

The Todilto Limestone was deposited in or near a large lake that at times became restricted and evaporated to dryness. formation has two members: lower limestone an upper gypsum member. member been divided informally into three zones: the platy zone, middle crinkly recrystallized zone. zone is interpreted have below wave base under anoxic conditions. thin stromatolitic laminations may form algal domes. appears part be collapsed breccia caused by removal of interbedded gypsum. Uranium ore primarily zones. These zones formed sabkha-like environment. /P> A. R. Renfro proposed sabkha origin for some stratiform copper deposits. same conditions cause precipitate would also uranium precipitate. Groundwater bearing U+6 could drawn upward evaporative pumping through decaying algal-mat where reduced U+4 precipitated. Carbonate materials lithify early destroying permeability so emplacement must occur before lithification. Radioisotope dates on uraninite indicate shortly after deposition. Uranium-bearing groundwater moved basinward underlying Entrada Sandstone along southwest margins Lake > End_of_Article – Last_Page 692————

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Discusses of the Jinshan Gold Deposit Features in Heilongjiang Province

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Discusses of the Jinshan Gold Deposit Features in Heilongjiang Province by Zhang Shu.

Heilongjiang province jinshan gold deposit occurred in antiform structure core of mesoproterozoic heilongjiang group lianying assemblage,The orebody equidistant distribution distributed NW direction,and controlled by the late formation fracture zone through action shearing. The mineralization concentration,occurrence depth is shallow,the features ore minerals and content gradually change from surface to underground has obvious oxidation enrichment trendwith basic characteristics crevasse epithermal deposit.

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The Sasa Lead-Zinc Deposit (Macedonia/Yugoslavia) and Its Position in the Serbian-Macedonian Ore Province

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The Sasa Lead-Zinc Deposit (Macedonia/Yugoslavia) and Its Position in the Serbian-Macedonian Ore Province by W. Tufar, I. Štrucl.

Numerous genetically and temporally different lead-zinc deposits occur within the Serbian-Macedonian ore province. Several well-known such as Sasa, Toranica, Blagodat are located economically important district of Besna Kobila-Osogovo which is part These not related to widespread Tertiary magmatism, but in fact time-bound strata-bound, stratiform, syngenetic mineralizations have been affected by subsequent regional metamorphism. As a result, they show mineral transformations, redeposition, mobilization, recrystallization their primary constituents.KeywordsPolished SectionGrain FabricSilicate GangueQuartz LatitePyrite PorphyroblastsThese keywords were added machine authors. This process experimental may be updated learning algorithm improves.

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Form of presence of gold in porphiry copper deposit Buchim (Eastern Macedonia)

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Form of presence of gold in porphiry copper deposit Buchim (Eastern Macedonia) by Todor Serafimovski, Vančo Cifliganec, S Mankov.

Tho investigations and examinations done so far determined that the distribuiton of gold in deposit is close correlation to copper, where most often occurs as native (hosted mainly chalcopyrites, par tially pyrites rarely magnetites) form tellurides (calaverite krennerite).
The latest ore microscope analyses elec­ tronic microprobe Buchim deposit, bisides mineralogical forms presence go ld, electrum petzite also appear, which at same time, represent new mineral kinds for association t his , At time
the distribution Au Ag he variations individual parts (central bnd rim) larger grains was followed. it det ermined contents are standard while
contents variable range within 80 – 92 % Au.

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Sulfide mineralogy of the Suurikuusikko (Kittilä) gold deposit – A comparative study of the Au-rich Rimpi ore zone and the Au-poor Pikkurouravaara area

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Sulfide mineralogy of the Suurikuusikko (Kittilä) gold deposit – A comparative study of the Au-rich Rimpi ore zone and the Au-poor Pikkurouravaara area by Roosa Hämäläinen.

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