Paper Information

Title: 

INVISIBLE GOLD WITHIN SULFIDES FROM THE CHAH-BAGH GOLD DEPOSIT, MUTEH MINING DISTRICT

Type: PAPER
Author(s): KOUHESTANI HOSSEIN*,RASTAD E.,RASHIDNEZHAD OMRAN N.A.
 
 *
 
Name of Seminar: SYMPOSIUM OF EARTH SCIENCES
Type of Seminar:  SYMPOSIUM
Sponsor:  ORGANIZATION OF GEOLOGICAL OF IRAN
Date:  2006Volume 24
 
 
Abstract: 

Chah-Bagh gold deposit is located in central part of Sanandaj-Sirjan zone, in Muteh mining district. Gold mineralization occured in ductile to ductile-brittle shear zones and is comparable with orogenic gold deposits. Principle ore minerals observed in mineralized zones are pyrite, chalcopyrite, Cu-bearing arsenopyrite, covellite, digenite and silver. Silver commonly occurs as native Ag intimately associated with siliceous gangue (nearly 5 µm) and as invisible association with the sulfide minerals. The maximum concentration of invisible Ag content is present within chalcopyrites. Although gold is not present as native form in siliceous gangue and altered sulfide mineral margins, but the electron microprobe analysis found evidence of invisible gold association with the sulfide minerals. Two phase of gold mineralization occur in the Chah-Bagh area: 1- invisible gold association with coarse-grain sulfides (pyrite and chalcopyrite); 2- invisible gold (the main phase) association with gold-bearing fine-grain sulfides (gold-bearing pyrite and chalcopyrite). Evidently, the replacement and precipitation of gold is an integral part of hydrothermal alteration systems and is associated with sulfidization.

 
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