A comparison of fluid origins and compositions in ironoxide-copper-gold and porphyry-Cu (Mo-Au) deposits

2015 ◽  
Author(s):  
B Rusk ◽  
P Emsbo ◽  
R Xavier ◽  
L Corriveau ◽  
N Oliver ◽  
...  
Keyword(s):  
Porphyry Cu ◽  
Copper Gold

scholarly journals Hydrothermal Alteration and Mineralization of the Randu Kuning Porphyry Cu-Au and Intermediate Sulphidation Epithermal Au-Base Metals Deposits in Selogiri, Central Java, Indonesia

2016 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
Sutarto Sutarto ◽  
Arifudin Idrus ◽  
Agung Harijoko ◽  
Lucas Donny Setijadji ◽  
Franz Michael Meyer ◽  
...  
Keyword(s):  
Hydrothermal Alteration ◽  
Carbonate Rocks ◽  
Base Metals ◽  
Porphyry Cu ◽  
Central Java ◽  
Copper Gold ◽  
Volcaniclastic Rocks ◽  
Gold Grade ◽  
Epithermal Au ◽  
Yogyakarta City

The Randu Kuning Porphyry Cu-Au prospect area is situated in the Selogiri district, Wonogiri regency, Central Java, Indonesia, about 40 km to the South-East from Solo city, or approximately 70 km east of Yogyakarta city. The Randu Kuning area and its vicinity is a part of the East Java Southern Mountain Zone, mostly occupied by both plutonic and volcanic igneous rocks, volcaniclastic, silisiclastic and carbonate rocks. Magmatism-volcanism products were indicated by the abundant of igneous and volcaniclastic rocks of Mandalika and Semilir Formation. The Alteration zones distribution are generally controlled by the NE–SW and NW–SE trending structures. At least eight types of hydrothermal alteration at the Randu Kuning area and its vicinity had been identified, i.e. magnetite + biotite ± K-feldspar ± chlorite (potassic), chlorite + sericite + magnetite ± actinolite, chlorite + magnetite ± actinolite ± carbonate (inner propylitic), chlorite + epidote ± carbonate (outer propylitic), sericite + quartz + pyrite (phyllic), illite + kaolinite ± smectite (intermediate argillic), illite + kaolinite ± pyrophyllite ± alunite (advanced argillic) and quatz + chlorite (sillisic) zones. The Randu Kuning mineralization at Selogiri is co existing with the porphyry Cu-Au and intermediate sulphidation epithermal Au-base metals. Mineralization in the porphyry environment is mostly associated with the present of quartz-sulphides veins including AB, C, carbonate-sulphides veins (D vein) as well as disseminated sulphides. While in the epithermal prospect, mineralization is particularly associated with pyrite + sphalerite + chalcopyrite + carbonate ± galena veins as well as hydrothermal breccias. The Randu Kuning porphyry prospect has copper gold grade in range at about 0.66–5.7 gr/t Au and 0.04–1.24 % Cu, whereas in the intermediate sulphidation epithermal contain around 0.1–20.8 gr/t Au, 1.2–28.1 gr/t Ag, 0.05–0.9 % Zn, 0.14–0.59 % Pb and 0.01–0.65 % Cu.

scholarly journals Chemistry of chlorite from the K-silicate-sericitic alteration in Elatsite porphyry Cu-Au deposit, Bulgaria

2021 ◽  
Vol 82 (3) ◽  
pp. 52-54
Author(s):  
Hristiana Georgieva ◽  
Rossen Nedialkov
Keyword(s):  
Gold Deposit ◽  
Mineral Content ◽  
Porphyry Copper ◽  
Asymmetric Distribution ◽  
Secondary Products ◽  
Porphyry Cu ◽  
Copper Gold

The K-silicate-sericitic alteration is one of the well-preserved hydrothermal alterations at the Elatsite porphyry-copper gold deposit (PCGD). It is observed in all lithological varieties, but shows asymmetric distribution of the secondary products. The alteration is genetically related with the occurrence of the K-silicate and Na-Ca-K-silicate alteration. The K-silicate-sericitic alteration has simple mineral content which includes mainly chlorite and sericite. The temperature of formation of the alteration is estimated between 250–268 °C.

The Bingham Canyon Porphyry Cu-Mo-Au Deposit. III. Zoned Copper-Gold Ore Deposition by Magmatic Vapor Expansion

2010 ◽  
Vol 105 (1) ◽  
pp. 91-118 ◽  
Author(s):  
M. R. Landtwing ◽  
C. Furrer ◽  
P. B. Redmond ◽  
T. Pettke ◽  
M. Guillong ◽  
...  
Keyword(s):  
Gold Ore ◽  
Porphyry Cu ◽  
Copper Gold ◽  
Ore Deposition
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