scholarly journals Ore mineralogy and mineral chemistry of quartz-chalcopyrite veins from the Krusha ore occurrence, Western Srednogorie, Bulgaria

2021 ◽  
Vol 82 (3) ◽  
pp. 150-152
Author(s):  
Ralica Sabeva
Keyword(s):  
Mineral Chemistry ◽  
Native Copper ◽  
Ore Mineralogy

The Krusha ore occurrence is located in the western part of the Srednogorie zone. The quartz-chalcopyrite veins are hosted by altered basaltic andesites. The styles of alteration are propylitic, sericitic, argillic and advanced argillic. The ore veins consist mainly of chalcopyrite, quartz and carbonates. Native copper is observed as single grains. Chalcopyrite is with high contents of Se. Au is up to 3.13 ppm with average contents of 1.43 ppm.

scholarly journals ORE MINERALOGY AND MINERAL CHEMISTRY OF PYRITE, GALENA, AND SPHALERITE AT SORIPESA PROSPECT AREA, SUMBAWA ISLAND, INDONESIA

2015 ◽  
Vol 4 (1) ◽  
Author(s):  
Win Kant ◽  
I Wayan Warmada ◽  
Arifudin Idrus ◽  
Lucas Donny Setijadji ◽  
Koichiro Watanabe
Keyword(s):  
Low Temperature ◽  
Hydrothermal Fluid ◽  
Mineral Chemistry ◽  
Careful Study ◽  
Average Content ◽  
Thin Sections ◽  
Content Ratio ◽  
Fe Content ◽  
Ore Minerals ◽  
Ore Mineralogy

The Soripesa prospect area is located at Maria village, Wawo district, Bima region in the East Sumbawa Island, Indonesia. Lithology is dominantly composed of a lithic-crystal tuff of andesitic and dacitic composition and bedded limestone. The polymetallic epithermal quartz veins are hosted by andesitic volcaniclastic rocks. Within these veins, multiphases, colloform-crustiform, bedding to massive textures with pyrite, sphalerite, galena, chalcopyrite, chalcocite, azurite, and malachite are observed. Selected samples were analyzed by using ore microscopy and SEM-EDX. Ore minerals show replacement, ex-solution, colloform, and zonal textures. The paragenesis diagram was made from a careful study of polished sections and thin sections. Textures of ore minerals such as banded, exsolution, replacement, and zone, have been interpreted to correspond to the order of deposition. In pyrite, the average content of Co (0.45 wt.%) is higher than Ni content (0.14 wt.%) and it means that their origin may be hydrothermal origin. Average content ratio, Co:Ni is 2.81. Galena shows a low Ag content of 0.07 %in average. But they show a high Au content of 1.48 %in average. Sphalerite shows a low Fe content of 1.04 %in average and occasionally chalcopyrite inclusion/disease also occurred. Ga and Ge contents are also high in sphalerite. Co>Ni in pyrite, low content of Ag in Galena, low content of Fe and mole % FeS in sphalerite, high content of Ga and Ge, and log (Ga/Ge) in sphalerite, show that pyrite, galena, and sphalerite from Soripesa prospect area were formed under low temperature condition of hydrothermal fluid. Keywords: Ore textures, paragenesis, deposition, hydrothermal fluid, low temperature

Ore Mineralogy and Mineral Chemistry of the Ashanti Gold Deposit at Obuasi, Ghana

1999 ◽  
Vol 49 (1) ◽  
pp. 1-11
Author(s):  
Shiloh OSAE ◽  
Katsuo KASE ◽  
Masahiro YAMAMOTO
Keyword(s):  
Gold Deposit ◽  
Mineral Chemistry ◽  
Ore Mineralogy

scholarly journals Ore mineralogy and mineral chemistry of the Whale Tail zone, Amaruq gold deposit, Nunavut

2020 ◽  
Author(s):  
M -C Lauzon ◽  
P Mercier-Langevin ◽  
M Valette ◽  
G Beaudoin ◽  
S De Souza ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Mineral Chemistry ◽  
Ore Mineralogy

scholarly journals New data on ore mineralogy and mineral chemistry of pyrite from the Pishtene ore occurrence, Western Srednogorie, Bulgaria

2021 ◽  
Vol 82 (3) ◽  
pp. 147-149
Author(s):  
Ralica Sabeva
Keyword(s):  
Mineral Chemistry ◽  
Ore Minerals ◽  
Ore Mineralization ◽  
Ore Mineralogy ◽  
High Concentrations

The Pishtene ore occurrence is situated north-northeast from the Pishtene paleovolcanic center in the western part of the Srednogorie zone. The occurrence is hosted by altered basaltic trachyandesites. The styles of alteration are advance argillic, argillic, sericitic and propylitic. Ore mineralization is in quartz-sericite zone and is represented by quartz-pyrite and quartz-polymetallic. The ore minerals are pyrite, chalcopyrite and sphalerite. Pyrite from quartz-polymetallic stage is with high concentrations of Cu, Se and Co. Au with low contents is also detected.

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