The Process Mineralogy of Gold: The Classification of Ore Types

From: JOM | Date: July 1, 2004| Author: Vaughan, J P | Copyright information

The principal gold minerals that affect the processing of gold ores are native gold, electrum, Au-Ag tellurides, aurostibite, maldonite, andauricupride. In addition, submicroscopic (solid solution) gold, principally in arsenopyrite and pyrite, is also important. The main causes of refractory gold, ores are submicroscopic gold, the Au-Ag tellurides, and very fine-grained gold (<10 µm) locked in Sulfides. Other types of problem gold ores include copper-gold ores and preg-robbing carbonaceou...

Read all of this article with a FREE trial to HighBeam Research

Related newspaper, magazine, and journal articles from HighBeam Research

Gold Process Mineralogy: Objectives, Techniques, and Applications
JOM ; The extractive metallurgy of gold is largely driven by mineralogical factors such as gold particle size; association with other minerals; coatings; presence of cyanicides, oxygen consumers, and preg-robbers; presence of refractory gold minerals; and locking of submicroscopic gold in sulfide and
Diagnostic Microbeam Technology in Gold Ore Processing
JOM ; ... analysis (AIA) techniques gaining broad acceptance over the last two decades.1 Automated image analysis methods rely on x-ray dot maps or backscattered electron images produced by scanning electron microscopy or electron probe microanalysis (EPMA). Sophisticated ...
Characterizing gold in refractory sulfide gold ores and residues
JOM ; Gold is present in refractory sulfide gold ores mainly in arsenian pyrite and arsenopyrite, where it occurs in both the chemically bonded state and as nano-size grains of metallic gold. During roasting or pressure oxidation, the sulfide matrix is destroyed and essentially all the gold is converted
Reactions of gold and sulfide minerals in cyanide media
Minerals & Metallurgical Processing ; Abstract The effect of pyrite, pyrrhotite, chalcopyrite, realgar and arsenopyrite on gold dissolution in cyanide media was investigated. The cyanidation of synthetic gold ores in the presence of various concentrations of sulfides was studied under constant experimental conditions. A mineralogical
Canadian conference of metallurgists issues call for papers
Mining Engineering ; CALL FOR PAPERS An International Symposium on the Treatment of Gold Ores will be held in conjunction with the Conference of Metallurgists (COM) 2005 in Calgary, AB Canada, August 21-24. The symposium will cover the fundamentals and plant practices for all aspects of gold processing and
Cyanide substitutes.
Mining Magazine ; Dr. Terry McNulty, P.E. Although cyanide's role as a gold lixiviant is increasingly coming under pressure, the alternatives are still not as economically or technically attractive. It is important to recognise that hydromet-allurgical treatment of gold ores predated the discovery of cyanidation.
Guimaras mining project opposed; Island folk reject 'glittering proposal' of mining company.(Provincial News)
Manila Bulletin ; ILOILO CITY (PNA) - Still reeling from adverse effects of the tragic oil spill that destroyed two years the island's pristine beaches, mangrove areas, and rich fishing grounds, the island province of Guimaras fears it may be facing another ecological disaster that may be caused by a gold-mining
Electrooxidation of gold-bearing sulfide concentrate
Minerals & Metallurgical Processing ; Nonmeeting paper number 02-308. Original manuscript submitted to SME March 2002. Revised manuscript received and accepted for publication August 2002. Discussion of this peer-reviewed and approved paper is invited and must be submitted to SME Publications Dept. prior to August 31, 200. Copyright
(book reviews)
Mining Magazine ; Large, high-grade, easily accessible ore deposits are rapidly becoming 'things of the past' and development of low cost alternative processes was therefore vital, according to the chairman of the organising committee. Two papers in Session 1 described the recovery of alloys from ferromanganese and
FREEPORT'S TAX PAYMENTS AMOUNT TO US$ 82 MILLION
Indonesian Commercial Newsletter ; Taxes paid to the Government by PT Freeport Indonesia Company (FIC), which is engaged in copper mining in Fakfak district, Irian Jaya, amounted to US$ 82.4 million last year. They comprised corporate tax (US$ 38.6 million), employees' income tax (US$ 18.2 million), dividend tax (US$ 9.8 million),