Characterization of Goldstrike ore carbonaceous material

Stenebråten, Jørn; Brosnahan, David R.

doi:10.1007/bf03402817

Cited by 13 publications

(16 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The carbon content in the Barrick's Goldstrike mines, Nevada, USA which is also a Carlin type deposit, varies from 8.3% to none detected giving rise to a series of preg-robbing characteristics ranging from low to high depending upon the maturity of carbonaceous matter in the ore. The maturity of the carbon increases from amorphous activated carbon to crystalline graphite (Stenebraten et al 2000). Also, the size of crystallite increases with carbon maturity.…”

Section: Characterization Of Carbonaceous Matter (Tcm)mentioning

confidence: 99%

“…These techniques are not always successful. Typical example of the carbonaceous refractory ores includes Cortez and Carlin trends in Nevada (Nelson et al 1982, Afenya 1991, Stenebraten et al 1999, Stenebraten et al 2000, Prestea goldfields of Ghana ((Osseo-Asare et al 1984, Abotsi and Osseo-Asare 1986, Abotsi and Osseo-Asare 1987), Kerr Anderson and McIntyre Porcupine mines of Canada (Nice 1971, Afenya 1991 and some carbonaceous ores from U.S.S.R to name a few.…”

Section: )mentioning

confidence: 99%

“…Data from the published literature on carbonaceous ores show that there is wide variation in carbon content and nature of carbonaceous matter (native carbon, hydrocarbon or humic acid) even within the same ore deposit resulting in varying degrees of preg-robbing capacity (Afenya 1991, Miller et al 2016. Carbonaceous ores from the Carlin trend showed carbonaceous matter in the range 8.3% to 0% (Stenebraten et al 2000). Ores from Carlin trend are termed "double refractory" due to the fact that gold grains are encapsulated in the sulfide mineral matrix as well as carbonaceous matter (Tabatabaei 2012).…”

Section: )mentioning

confidence: 99%

“…Carbonaceous matter similar to activated carbon which has the ability to adsorb Carbonaceous matter with ores of varying pre-robbing capacity from Barrick Goldstrike mine was spectroscopically analyzed by (Stenebraten et al 1999). Carbonaceous matters showed a relatively featureless aromatic structures showing an activated carbon or graphitic type matrix with either or thicarbonyl functionality.…”

Section: Characterization Of Carbonaceous Matter (Tcm)mentioning

confidence: 99%

“…The gold adsorption and gold recovery behaviour of carbonaceous matter from Barrick's Goldstrike mines, was examined by (Stenebraten et al 2000) using a combination of %C and crystallite dimension Lc (002). X-ray diffraction (XRD) analysis indicated an inverse relationship between the preg-robbing characteristics of the ore and the crystallite Lc Stenebraten et al concluded that the crystallite size Lc (002) had a direct correlation with bench-top autoclaving and carbon-in-leach (BTAC-CIL) recovery while, Carbon % has an inverse relation.…”

Section: Characterization Of Carbonaceous Matter (Tcm)mentioning

confidence: 99%

See 4 more Smart Citations

The influence of mineralogy and surface chemistry on flotation of Cortez complex carbonaceous double refractory gold ore

Thella¹

View full text Add to dashboard Cite

The recovery of gold from complex refractory gold ores is challenging. The refractory nature of these ores is due to the encapsulation of gold as colloidal gold particles or as gold in solid solution in a mineral matrix which is unreactive and impervious during the cyanide leaching process. The complexity of processing increases when both the presence of disseminated gold in the mineral matrix as well as the interference phases are present in the ore. The ore investigated in this research, from Barrick's Cortez mine in Nevada, USA, is a notable example of this type of complex refractory ore which is described as double-refractory due to the presence of gold in a sulfide mineral matrix as well as in carbonaceous matter in the ore. Double-refractory ores give low recoveries of gold during the cyanide leaching process, and a pre-concentration stage is required to achieve acceptable gold recoveries. Typically, flotation is the pre-concentration method employed to recover the gold-bearing mineral phases in the ore. Although the flotation response of Cortez double refractory gold ore has been assessed at a number of commercial laboratories, gold recoveries remain lower than expected, and the reasons for this are not well understood. This thesis examines the influence of mineralogy and surface chemistry on the flotation recovery of gold in the Cortez double refractory gold ore. A comprehensive, novel experimental approach that combines solution analysis, optical microscopy, SEM-based automated mineral analysis (MLA/QEMSCAN), Raman spectroscopy, Dynamic secondary ion mass spectrometry, ToF-SIMS and X-ray photoelectron spectroscopy analysis on flotation feed, concentrates (both carbonaceous matter (TCM) and sulfides concentrates) and tailings has been applied to identify the causes of low gold recovery in flotation. The results of the research have shown that contrary to the expected deportment of gold in Carlin-type deposits as invisible gold associated with sulfide minerals, the gold in this Cortez ore is predominantly visible gold, present as native gold grains ranging in size from 2 to 33 µm with an average of 10µm. This is the main cause of the low gold recovery observed for this ore when treated with the standard Cortez ore flotation reagent regime which is designed to recover gold-bearing pyrite. The xanthate collector used in the standard Cortez reagent regime would not selectively recover grains of native gold. Exploratory flotation tests with a collector that specifically targets viii Financial support This research work was fully funded by Barrick Gold Corporation, Canada and I take immense pleasure in thanking Barrick personnel especially Dr. Barun Gorain who made my Ph.D. experience productive and fruitful.

show abstract

Section: Characterization Of Carbonaceous Matter (Tcm)mentioning

confidence: 99%