Process mineralogy of gold: Gold from telluride-bearing ores

Spry, Paul G.; Chryssoulis, Stephen L.; Ryan, Chris

doi:10.1007/s11837-004-0185-4

Cited by 29 publications

(9 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the advent of new analytical technologies over the last 20 years, we are learning a lot more about refractory gold [2][3][4][5][6][7][8]. This research into refractory gold was spurred on by the discovery of the Carlin deposits in Nevada, which, in the primary zone, contain close to 100% invisible gold.…”

Section: Introductionmentioning

confidence: 99%

Invisible Gold Paragenesis and Geochemistry in Pyrite from Orogenic and Sediment-Hosted Gold Deposits

Large

Масленников

2020

Minerals

View full text Add to dashboard Cite

LA-ICPMS analysis of pyrite in ten gold deposits is used to determine the precise siting of invisible gold within pyrite, and thus the timing of gold introduction relative to the growth of pyrite and related orogenic events. A spectrum of invisible gold relationships in pyrite has been observed which suggests that, relative to orogenic pyrite growth, gold introduction in some deposits is early at the start of pyrite growth; in other deposits, it is late toward the end of pyrite growth and in a third case, it may be introduced at the intermediate stage of orogenic pyrite growth. In addition, we report a distinct chemical association of invisible gold in pyrite in the deposits studied. For example, in the Gold Quarry (Carlin type), Mt Olympus, Macraes and Konkera, the invisible gold is principally related to the arsenic content of pyrite. In contrast, in Kumtor and Geita Hill, the invisible gold is principally related to the tellurium content of pyrite. Other deposits (Golden Mile, Bendigo, Spanish Mountain, Witwatersrand Carbon Leader Reef (CLR)) exhibit both the Au-As and Au-Te association in pyrite. Some deposits of the Au-As association have late orogenic Au-As-rich rims on pyrite, which substantially increase the value of the ore. In contrast, deposits of the Au-Te association are not known to have Au-rich rims on pyrite but contain nano-to micro-inclusions of Au-Ag-(Pb-Bi) tellurides.solution As, known as arsenian pyrite [9,10]. Arsenic can substitute into either the Fe site or the S site in pyrite and a maximum of 8%-11% As has been reported [11][12][13]. The position of ionic gold in the structure of pyrite is still not clear, although it is assumed that ionic gold Au + substitutes for iron, entering distorted octahedral sites, whereas As substitutes for S in the tetrahedral sites [8]. Both surface speciation, and distortion-expansion of the pyrite lattice by incorporation of As are considered to be key processes in Au accumulation by arsenian pyrite [8,14].A landmark publication [4] defined a relationship between the amount of invisible solid solution gold in pyrite and its arsenic content, using a database of analyses of pyrite from several Carlin and epithermal deposits. This maximum limit of invisible gold, from pyrite formed in the temperature range of 150 to 250 • C, is approximately 100 ppm Au for 2000 ppm As, and 1000 ppm Au for 2% As, and has become known as the saturation line for Au in arsenian pyrite (Figure 1; [4]). Gold analyses of pyrite that plot above the saturation line indicate free gold as nano-to micro-inclusions in pyrite. More recent research [5] has shown that the gold saturation line is most probably controlled by a number of factors, possibly including the crystal chemistry of pyrite and fluid/rock interactions and therefore different positions of the gold saturation line may need to be defined for each gold deposit type.Minerals 2020, 10, x FOR PEER REVIEW 2 of 21 solution As, known as arsenian pyrite [9,10]. Arsenic can substitute into either the Fe site or the S site in pyrite a...

show abstract

Section: Introductionmentioning

confidence: 99%

Invisible Gold Paragenesis and Geochemistry in Pyrite from Orogenic and Sediment-Hosted Gold Deposits

Large

Масленников

2020

Minerals

View full text Add to dashboard Cite

show abstract

“…The Telluride mineralogy of these deposits has been most recently discussed by Spry and co-workers. [39][40][41][42][43] Interestingly, Te was mined as a by-product of Au mining from the Emperor Mine from 1976 to 1980 in a selective flotation process described elsewhere. 44 Over this 5-year period, about 71Á4 tonnes of Te is reported as being extracted, compared to 6Á3 tonnes of Au, 45 peaking at 22Á7 tonnes/year Te in 1978-1979.…”

Section: Au-te Oresmentioning

confidence: 99%

Estimates of te and in prices from direct mining of known ores

Green

2009

Progress in Photovoltaics

116

View full text Add to dashboard Cite

Previous estimates of Te and In availability for large scale use in photovoltaics have been based on considerations such as present refining capacities or on reserves calculated from the concentration of these metals in their respective Cu and Zn primary ores. The present work considers the pricing required to support direct mining of these scarce metals from ores of presently known quality. By deriving a general relationship between the market price of metals and the quality of ores from which they are mined, estimates of the market price of Te and In if mined from available ores are obtained. This allows specification of ore grades required for economic photovoltaic exploitation. Known ore deposits meeting requirements are also surveyed.

show abstract

“…Technological schemes for the processing of gold-bearing ores, depending on the characteristics of the mineral, phase, chemical, granulometric composition, the size and geometric shape of gold particles, the purity of the surface of gold grains, which determine the "obstinateness" of raw materials, are very diverse and include dozens of technological operations that combine enrichment, and chemical and metallurgical processes. The parameters of the material composition are determined during technological sampling, geological and technological modeling, which are carried out at all stages of geological work, technological assessment and industrial processing of ores [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Chemical Analysis of the Composition of Ores as the Basis for Improving the Quality of Ore Preparation

et al. 2021

View full text Add to dashboard Cite

An assessment of the existing methods of controlling the quality of mineral raw materials during mining and possible ways of increasing their efficiency is presented. Criteria for evaluating the ore massif are given, depending on the mineral and chemical composition, structural and other features. As a result of the studies, the problem of increasing the efficiency of ore preparation was solved based on the use of chemical analysis of the granulometric composition of the processed ore (charge), which provided an increase in the extraction of the useful component, which makes the model of the charge of ores from various deposits more accurate.

show abstract

Process mineralogy of gold: Gold from telluride-bearing ores

Cited by 29 publications

References 8 publications

Invisible Gold Paragenesis and Geochemistry in Pyrite from Orogenic and Sediment-Hosted Gold Deposits

Invisible Gold Paragenesis and Geochemistry in Pyrite from Orogenic and Sediment-Hosted Gold Deposits

Estimates of te and in prices from direct mining of known ores

Chemical Analysis of the Composition of Ores as the Basis for Improving the Quality of Ore Preparation

Contact Info

Product

Resources

About