Role of chloride hydrometallurgy in processing of complex (massive) sulphide ores

1990 ◽  
pp. 233-254 ◽  
Author(s):  
D. N. Collins ◽  
D. S. Flett
Keyword(s):  
Massive Sulphide ◽  
Sulphide Ores

Use of pyrite microfabric as a key to tectono-thermal evolution of massive sulphide deposits – an example from Deri, southern Rajasthan, India

1998 ◽  
Vol 62 (2) ◽  
pp. 197-212 ◽  
Author(s):  
Anju Tiwary ◽  
Mihir Deb ◽  
Nigel J. Cook
Keyword(s):  
Thermal Evolution ◽  
Regional Metamorphism ◽  
Massive Sulphide ◽  
Ductile Deformation ◽  
Sulphide Deposit ◽  
Fine Grained ◽  
Thermal Metamorphism ◽  
Sulphide Ores ◽  
History Of ◽  
South Delhi Fold Belt

AbstractPyrite is an ubiquitous constituent of the Proterozoic massive sulphide deposit at Deri, in the South Delhi Fold Belt of southern Rajasthan. Preserved pyrite microfabrics in the Zn-Pb-Cu sulphide ores of Deri reveal a polyphase growth history of the iron sulphide and enable the tectono-thermal evolution of the deposit to be reconstructed.Primary sedimentary features in Deri pyrites are preserved as compositional banding. Regional metamorphism from mid-greenschist to low amphibolite facies is recorded by various microtextures of pyrite. Trails of fine grained pyrite inclusions within hornblende porphyroblasts define S1-schistosity. Pyrite boudins aligned parallel to S1 mark the brittle–ductile transformation of pyrite during the earliest deformation in the region. Isoclinal to tight folds (F1 and F2) in pyrite layers relate to a ductile deformation stage during progressive regional metamorphism. Peak metamorphic conditions around 550°C, an estimation supported by garnet–biotite thermometry, resulted in annealing of pyrite grains, while porphyroblastic growth of pyrite (up to 900 µm) took place along the retrogressive path. Brittle deformation of pyrite and growth of irregular pyritic mass around such fractured porphyroblasts characterize the waning phase of regional metamorphism. A subsequent phase of stress-free, thermal metamorphism is recorded in the decussate and rosette textures of arsenopyrite prisms replacing irregular pyritic mass. Annealing of such patchy pyrite provides information regarding the temperature conditions during this episode of thermal metamorphism which is consistent with the hornblendehornfels facies metamorphism interpreted from magnetite–ilmenite geothermometry (550°C) and sphalerite geobarometry (3.5 kbar). A mild cataclastic deformation during the penultimate phase produced microfaults in twinned arsenopyrite prisms.

Role of ore mineralogy in optimizing conditions for bioleaching low-grade complex sulphide ores

2008 ◽  
Vol 18 (5) ◽  
pp. 1234-1246 ◽  
Author(s):  
P.A. OLUBAMBI ◽  
S. NDLOVU ◽  
J.H. POTGIETER ◽  
J.O. BORODE
Keyword(s):  
Low Grade ◽  
Sulphide Ores ◽  
Ore Mineralogy

Intergrowths of hexagonal and monoclinic pyrrhotites in some sulphide ores from norway

1996 ◽  
Vol 60 (399) ◽  
pp. 303-316 ◽  
Author(s):  
Gu Lianxing ◽  
Frank M. Vokes
Keyword(s):  
Grain Boundaries ◽  
Massive Sulphide ◽  
Hydrothermal Solutions ◽  
Copper Deposits ◽  
Anisotropic Stress ◽  
Sulphide Ores ◽  
Nickel Copper ◽  
Lamella Thickness ◽  
Monoclinic Pyrrhotite ◽  
Hexagonal Pyrrhotite

AbstractPyrrhotites in polished sections from more than twenty stratabound massive sulphide and magmatic nickel-copper deposits in Norway were studied under the microscope using the magnetic colloid method. In both types of deposits, two distinct styles of intergrowths between monoclinic and hexagonal pyrrhotites were found: crystallographically-controlled lamellar intergrowths and fissure-controlled irregular intergrowths.Lamellar intergrowths consist of crystallographically oriented monoclinic lamellae occurring in a hexagonal matrix and were produced originally by exsolution from hexagonal pyrrhotite on cooling. Irregular intergrowths comprise blades and patches of monoclinic pyrrhotite occurring along fissures and grain boundaries of hexagonal pyrrhotite, and were formed by interactions between hexagonal grains and sulphur-rich hydrothermal solutions.Increase in lamella thickness and spacing, development of lamella zonations, wedge-shaped composite ends, boxworks and composite lamellae were caused by progressive lamellae coarsening and maturation during natural annealing, which could have been promoted by anisotropic stress. Metamorphic recrystallization and annealing tend to homogenize pyrrhotite and erase preexisting exsolution lamellae.

The role of granites in volcanic-hosted massive sulphide ore-forming systems: an assessment of magmatic–hydrothermal contributions

2010 ◽  
Vol 46 (5-6) ◽  
pp. 473-507 ◽  
Author(s):  
David L. Huston ◽  
Jorge M. R. S. Relvas ◽  
J. Bruce Gemmell ◽  
Susan Drieberg
Keyword(s):  
Massive Sulphide ◽  
Sulphide Ore

The role of bacteria in degradation of exposed massive sulphides at Citronen Fjord, North Greenland: project ‘Resources of the sedimentary basins of North and East Greenland’

1997 ◽  
pp. 39-43 ◽  
Author(s):  
Bjarne R. Langdahl ◽  
Bo Elberling
Keyword(s):  
Atmospheric Oxygen ◽  
Sedimentary Basins ◽  
High Arctic ◽  
Environmental Research ◽  
Joint Project ◽  
East Greenland ◽  
Sulphide Ores ◽  
North Greenland ◽  
Massive Sulphides

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Langdahl, B. R., & Elberling, B. (1997). The role of bacteria in degradation of exposed massive sulphides at Citronen Fjord, North Greenland: project ‘Resources of the sedimentary basins of North and East Greenland’. Geology of Greenland Survey Bulletin, 176, 39-43. https://doi.org/10.34194/ggub.v176.5059 _______________ The multidisciplinary research project ‘Resources of the sedimentary basins of North and East Greenland’ was initiated in 1995 with financial support from the Danish Research Councils (Stemmerik et al., 1996). The Citronen Fjord zinc prospect (Fig. 1) discovered by Platinova A/S in 1993 is by far the largest sulphide occurrence known in North Greenland, and is currently being investigated as a potential exploitable resource. However, the mining and processing of sulphide ores can create serious pollution problems in the surrounding terrestrial and aquatic ecosystems by exposing large amounts of sulphidic material to atmospheric oxygen and ‘attack’ by mineral-oxidising bacteria. At lower latitudes, the slow abiotic oxidation of metal sulphides is known to be significantly accelerated by bacterial attack. A microbiological investigation of the Citronen Fjord zinc deposit was initiated in the summer of 1995 to investigate the role bacteria might play in oxidation of sulphidic material in High Arctic areas. This is a joint project involving the Danish Environmental Research Institute (Department of Arctic Environment) and the University of Aarhus (Department of Microbial Ecology). 

Ore petrology of volcanogenic massive sulphide ores in the Ural Mountains, Russia

GFF ◽  
1996 ◽  
Vol 118 (sup004) ◽  
pp. 45-45
Author(s):  
M. Leijd ◽  
K. Sundblad ◽  
E. Kontar
Keyword(s):  
Massive Sulphide ◽  
Ural Mountains ◽  
Sulphide Ores ◽  
Volcanogenic Massive Sulphide
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