·The journal Geology of Ore Deposits for the first time publishes a special thematic issue dedicated to gold ore deposits Historically the magazine has always paid special attention to these objects In the post Soviet time when many restrictions on publications were lifted and deposits were finally called by their proper names most of the gold deposits of the
Gold deposits are formed via a very wide variety of geological processes Deposits are classified as primary alluvial or placerdeposits or residual or laterite deposits Often a deposit will contain a mixture of all three types of ore Figure 1 High grade bonanza gold ore brecciated quartz adularia rhyolite
·The results indicated that core rim textured pyrite is the dominant pyrite type in the ore This type of pyrite is characterized by the sharp core rim interfaces euhedral subhedral morphology and oscillating zoning The gold/arsenic rich rim and gold/arsenic poor core formed during the main ore and pre ore stages respectively
·The ore type is composed of veinlet disseminated type and gold bearing polymetallic quartz vein type Pyrite constituting over 95% of the entire sulfide content stands out as the predominant ore mineral trailed by chalcopyrite sphalerite galena molybdenite tetradymite electrum etc The results of the sulfur isotope analysis for
·The δ 13 C value of different stages of Baguamiao gold deposit range from − to ‰ The Baguamiao gold deposit and other orogenic type gold deposits in the West Qinling such as Yangshan Ma anqiao and Shuangwang occur near the deep faults on the boundary of the convergent plate margin and the ore bearing wall rocks are
·These results show that the Saibagou gold ores contain three types of FIs aqueous aqueous CO 2 and pure CO 2 type The ore forming fluids in each stage changed from an early medium temperature and low salinity H 2 O NaCl ± CO 2 system to a late low temperature and low salinity H 2 O NaCl system The D O isotopes show that the ore forming
·In addition to extraction the application of these reagents in the gold processing pre treatment and gold purification stages is explored The main objective here is to discuss how the gold extraction process can be more sustainable with a view to developing more greener leaching reagents There are as Fig 1 indicates 11 gold ore
·In the Linglong gold deposit the early stage quartz mainly contains primary type II fluid inclusions and a few type I fluid inclusions of which type II fluid inclusions have salinities of wt % NaCl equivalent and homogenization temperatures of 271 374 ° middle stage quartz mainly contains all four types of fluid inclusions among which the type II fluid inclusions
In general gold ore can be divided into two types namely free milling ore and refractory ore [2] Free milling ore refers to ore in which gold can be liberated easily some selected fresh rock samples were also used in studying the phases and morphology of the ore Polished sections of the rock sample were prepared by using
·In orogenic as well as other porphyry epithermal and carlin type gold deposits gold unequivocally shows intimate relationships with sulfides such as pyrrhotite and pyrite Barker et al 2009 stages III V developed as a separate hydrothermal event with new pulses of ore forming fluids that overprinted early ore stages I II
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