The ore-body has been folded into a tight to isoclinal NE-plunging, F1 antiform, with both limbs Gold mineralization in Natal, South Africa 107 dipping -40NW. Pyrite (10-50%) is the dominant sulphide, with minor galena and sphalerite. Gold grades average 1.25 ppm over a …

The initial gold enrichment is defined by Au concentrations (0.001–0.005 ppm) of unaltered Neoarchean gneisses, increasing to 0.006–0.031 ppm Au for the ore-hosting Neoarchean altered mylonitic gneisses (Zeng et al., 2014, Liu et al., 2017).

Refractory gold ores in Archaean greenstones, Western Australia: mineralogy, gold paragenesis, metallurgical characterization and classification

Refractory gold ores in Archaean greenstones, Western Australia: mineralogy, gold para-genesis, metallurgical characterization and classification …

The Abitibi greenstone belt in Ontario and Quebec is one of the largest Archean greenstone belts in the world. In Antarctica, the Fisher Massif, of Proterozoic age, closely resembles the composition and structure of a greenstone belt. Greenstone belts often contain ore deposits of …

These include asbestos, magnesite, gold (in a low sulphide mound on the mid-Atlantic rise at listvaenite), talc, and lateritic Ni-(Cr-Co-Fe) ore in 26 N with a diameter of 250 m and a height of deeply weathered soil profiles. 50 m, that contains about 10 Mt of metalliferous sediments, sulphide debris and anhydrite, covered 1.1.3 Ore formation ...

Double refractory gold ores, such as Barrick's Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching.

Complex sulphide ore, refractory gold ores are not simple problems to solve; hence the JORC code which correctly applies modifying factors to ores that may in …

Refractory carbonaceous gold ores pose challenges during cyanidation of gold due to the presence of carbonaceous matter (CM) which preg-robs dissolved gold, and this results in a decreased recovery. In an on-going study, the fungus, Phanerochaete chrysosporium has been used to deactivate CM and decrease its ability to preg-rob aurocyanide. P. chrysosporium has been …

Mesothermal gold ores in the Archaean Yilgarn Craton of Western Australia are dominated by a pyrite ± arsenopyrite ± pyrrhotite sulphide assemblage. Many of these ores are refractory to varying degrees and require treatment by roasting, bacterial oxidation or finer milling.

The ore in both reduced and oxidized types tends to have low Cu:Au (<2000), Cu:Ag (<1000), Zn:Au (<100) and Ag/Au (<1) ratios. Gold is commonly present as micron-sized inclusions in sulphides, or at sulphide grain boundaries. It is often associated with tellurides. To the naked eye, Au skarn ore is generally indistinguishable from waste rock.

Greenstone belt. Greenstone belts are generally elongate, Archean to Proterozoic terrains comprising intrusive and extrusive mafic to ultramafic igneous rocks, felsic volcanics, and inter-flow or cover sedimentary rocks. Greenstone belts occur sandwiched between regions dominated by granitoids and gneiss.Greenstones are generally of low to moderate metamorphic grade.

gold and refractory (sulfide-hosted, "invisible") gold. Considerable effort has been expended to examine the location, mechanisms of precipitation and timing of native gold in quartz veins, which is showri ih several cases to b'e located in fractures related to late-stage brittle deformation of early quarrz (White 1943, Boiron et al. l99l).

Refractory gold ores in Archaean greenstones, Western Australia: Mineralogy, gold paragenesis, metallurgical characterization and classification. Mineralogical Magazine, 68(2): 255-277. Velasquez G, Beziat D, Salvi S, Siebenaller, L, Borisova A Y, Pokrovski G S and Parseval P. 2014. Formation and deformation of pyrite and implications for gold ...

The Golden Mile deposit (1767 t Au) in the Archean Yilgarn Craton, Western Australia, is controlled by D2 strike-slip and D3 reverse faults displacing folded tholeiitic greenstones. Granodiorite and monzodiorite dykes emplaced into the faults predate and are synchronous with propylitic and sericite–ankerite alteration overprinted by the ore.

The Golden Mile deposit (1767 t Au) in the Archean Yilgarn Craton, Western Australia, is controlled by D2 strike-slip and D3 reverse faults displacing folded tholeiitic greenstones. Granodiorite and monzodiorite dykes emplaced into the faults predate and are synchronous with propylitic and sericite-ankerite alteration overprinted by the ore. Arsenopyrite and chlorite thermometry and fluid ...

This study relates morphology, size, texture, and chemistry of arsenian pyrite in the Twin Creeks Carlin-type gold deposits to the chemical position and amount of gold that it contains. Arsenian pyrite is confirmed as the most important gold-hosting mineral and four types of gold-bearing arsenian pyrite are recognized. Among these four types, the lowest amount of gold and arsenic (<1 wt % As ...

Refractory gold ores in Archaean greenstones, Western Australia: Mineralogy, gold paragenesis, metallurgical characterization and classification April 2004 Mineralogical Magazine 68(2):255-277

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Mesothermal gold ores in the Archaean Yilgarn Craton of Western Australia are dominated by a pyrite 7 arsenopyrite 7 pyrrhotite sulphide assemblage. Many of these ores are refractory to varying degrees and require treatment by roasting, bacterial oxidation or finer milling.

Refractory gold ores in Archaean greenstones, Western Australia … Ora Banda sulphide ore has been blended with oxide and other ore sources before processing in a CIL plant … sulphide gold ores in … difference in … »More detailed

Refractory gold ores in Archaean greenstones,Western Australia: mineralogy, gold paragenesis, metallurgical characterization and classification J. Vaughan, A. Kyin Geology

Simple (non-refractory) and refractory gold ores Simpie goid ores are those thal respond readily to direct cyanidation producing goid recovery in excess of YO per cent. Rcfractory gold ores, on thc contrary, are ditTicult to treat and on direct cyanidation produce goid recovery of …

Invisible gold within sulfides from the Archean Hutti-Maski schist belt, Southern India. venkatesh akella. I. Saha. venkatesh akella. ... Genesis and evolution of the ore deposits in the early Precambrian greenstone belts and adjacent high grade metamorphic terrains of Peninsular India — …

In Karnataka, refractory grade dolomite is worked around Sankarudda in Shimoga district and is the principal source of refractories for use in the steel plant at Bhadravati. The total reserves of blast furnace and steel melting shop grades of dolomite in India are estimated at 720 and 428 million tonnes respectively.

Abstract: The Jinchiling gold deposit,located in the central and western part of Zhaoyuan-Laizhou gold metallogenic belt,is a typical lode gold deposit hosted in Late Jurassic Linglong granitoids in the Jiaodong region. The source of its ore-forming fluids and ore genesis,however,are still in debate. Based on the detailed study of mineralogy and microstructure of pyrite,trace elements and ...

Many refractory gold ores need to be heated at low temperatures in order to obtain a significant amount of gold by subsequent leaching [9–11]. The cyanidation process must be preceded by preliminary oxidation, which disturbs the sulfide lattice and helps cyanide ions reach the gold particles [ …

To overcome this problem, many researchers have challenged environmentally friendly bioprocess to maximize gold recovery from carbonaceous refractory gold ores, so-called as double refractory gold ores (DRGO) (Baron et al., 2016). In early stages, Afenya (1991) suggested several possibilities, of which bioleaching was one, but was as yet untried.

Bralia, A., Sabatini, G., Troja, F., 1979. A Revaluation of the Co/Ni Ratio in Pyrite as Geochemical Tool in Ore Genesis Problems. Mineralium Deposita ... Textural Control on Gold Distribution in As-Free Pyrite from the Dongping, Huangtuliang and Hougou Gold Deposits, North China Craton (Hebei Province, China). Chemical Geology, 264(1-4): 101 ...

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Refractory gold ores in Archaean greenstones,Western Australia: mineralogy, gold paragenesis, metallurgical characterization and classification - Volume 68 Issue 2

JP Vaughan A Kyin (2004) ArticleTitle Refractory gold ores in Archaean greenstones, Western Australia: Mineralogy, gold paragenesis, metallurgical characterization and classification Mineral Mag 68 255–277 Occurrence Handle 10.1180/0026461046820186

Refractory gold ores in Archaean greenstones,Western ... Pyritic ores are free-milling to mildly refractory, or rarely moderately refractory. Pyrite in pyritic ores contains negligible to low levels of submicroscopic gold (5 ppm). Other reasons for refractory behaviour in pyritic ores include very fine-grained native gold inclusions in pyrite ...

Kanowna Belle gold mine is located some 20km north east of Kalgoorlie. Delta Gold NL and Geopeko Gold discovered the orebody in 1989. Construction began in 1992, the open pit was commissioned in mid-1993 and operations are now underground. In mid-1999, Delta Gold bought North's 50% share for AUS$90m, and became the sole owner.

The Nickgraph tenement package stretches from Bullfinch in the south to Trough Well in the north and covers approximately 50 strike km's (238 sq. km) of granted tenements over Archaean greenstone lithologies prospective for orogenic gold deposits, nickel-copper sulphide deposits, iron ore and pegmatite-hosted lithium.

Refractory gold ores in Archaean greenstones, Western - CiteSeerX Arsenopyrite in free-milling ores is coarser grained, less As-deficient to contains moderately high levels of submicroscopic gold (20А40 ppm), the in the ore exert a primary control on gold recovery. Sulphide assemblages in arsenical ores.