Invisible Gold Distribution in Pyrite and Arsenopyrite from Free-milling, Transitional, and Refractory Gold Ores, Nerco Con Mine, Yellowknife, NWT. PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Invisible Gold Distribution in Pyrite and Arsenopyrite from Free-milling, Transitional, and Refractory Gold Ores, Nerco Con Mine, Yellowknife, NWT. PDF full book. Access full book title Invisible Gold Distribution in Pyrite and Arsenopyrite from Free-milling, Transitional, and Refractory Gold Ores, Nerco Con Mine, Yellowknife, NWT. by John P. Armstrong. Download full books in PDF and EPUB format.
Author: John P. Armstrong
Publisher:
ISBN:
Category :
Languages : en
Pages : 53
Get Book Here
Book Description
Author: John P. Armstrong
Publisher:
ISBN:
Category :
Languages : en
Pages : 53
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1688
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 724
Get Book Here
Book Description
Author: P. Bhakta
Publisher:
ISBN:
Category : Gold
Languages : en
Pages : 20
Get Book Here
Book Description
Author: Harold J. Heinen
Publisher:
ISBN:
Category : Adsorption
Languages : en
Pages : 32
Get Book Here
Book Description
Author: Pamela J. Fulton
Publisher:
ISBN:
Category :
Languages : en
Pages : 414
Get Book Here
Book Description
Author: Mark Graham Aylmore
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
The observations on the effects of arsenic residence time, and the relative mobility of solid solution and particulate gold during the thermal decomposition of auriferous arsenopyrite and pyrite, have significant implications for improved industrial extraction of gold from these minerals.
Author: Matthew Francis Mann
Publisher:
ISBN: 9781369885842
Category : Geochemistry
Languages : en
Pages : 128
Get Book Here
Book Description
Invisible gold is a type of gold ore that consists of micrometer sized blebs of native gold and structurally bound gold in iron sulfides, most commonly pyrite, arsenian pyrite and arsenopyrite. Invisible gold is found in hydrothermal-type gold deposits, can make up a large percentage of the gold found in that deposit, and has been noted to be related directly to the arsenic concentration of the crystal, with increasing arsenic concentrations correlating with increasing gold concentrations. The relationship between arsenic and gold was evaluated by conducting experiments at 200 °C, 300 °C, 400 °C, 500 °C and 600 °C. Pyrite or arsenopyrite seed crystals were placed into quartz or silica-based glass vessels with a synthetic hydrothermal fluid and metallic gold for a minimum and maximum of 60 and 370 days, respectively. Run products were analyzed by electron microprobe and laser ablation inductively coupled plasma mass spectrometry. Gold concentrations in arsenopyrite and pyrite rims ranged from 0.058 to 0.685 and 0.011 to 0.073 microg/g at 200 °C, respectively. Gold concentrations were 0.194 to 2.641 and 0.076 to 0.324 microg/g at 600 °C in the rims of arsenopyrite and pyrite, respectively. Gold concentrations were higher in the rims of run product crystals and lower in the crystal cores and were found to increase with increasing temperature. This study showed that the presence of arsenic enhanced the concentration of gold in pyrite and arsenopyrite at the conditions of the experiments, but, the concentrations observed were lower than concentrations observed in some natural samples, which can reach up to 10,000 microg/g. This suggests that surficial processes, most likely through chemisorption and/or electrosorption during crystal growth, attract gold ions, atoms, and/or molecules to the surface of the mineral to aid in enhancing gold concentrations in arsenic-bearing minerals.
Author: R. N. Guest
Publisher:
ISBN: 9780869995815
Category : Gold
Languages : en
Pages : 9
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
A mineralogical investigation of the main causes of refractoriness of some metallurgically complex gold ores in South Africa is reported. It is shown that this refractoriness is related to the presence of submicroscopic gold, carbonaceous material, pyrrhotite, and base-metal sulphides. Gold ores can be classified according to their content of these components. Electron-microprobe analysis shows that gold occurs in arsenopyrite and pyrite, the gold contents of which can be up to 2700 g/t. The gold and arsenic contents of these minerals are closely correlated. Furthermore, within zoned arsenopyrite grains, the concentration of gold closely follows that of arsenic. Mossbauer spectroscopy carried out on samples of concentrate from the Barberton area indicates that the submicroscopic gold within the sulphides is in a non-metallic form. The mineralogical examination of beneficiation products is important, since it sheds light on some fundamental aspects of the behaviour of the ore and gangue components during milling and flotation. Such basic information will lead ultimately to a better understanding of the problems in the beneficiation of these ores. Investigations have shown that the overmilling of the auriferous arsenopyrite and the disseminated nature of the sulphide mineralization are the main problems during beneficiation.
