scholarly journals Structural controls and relative timing of gold mineralization of the banded iron formation-associated Tiriganiaq deposit, Meliadine district, Rankin Inlet greenstone belt, Nunavut

2020 ◽  
Author(s):  
B St. Pierre ◽  
P Mercier-Langevin ◽  
J -C Blais ◽  
G Servelle ◽  
M Simard ◽  
...  
Keyword(s):  
Greenstone Belt ◽  
Gold Mineralization ◽  
Iron Formation ◽  
Relative Timing ◽  
Banded Iron Formation ◽  
Structural Controls

scholarly journals Gold Mineralization in Banded Iron Formation in the Amalia Greenstone Belt, South Africa: A Mineralogical and Sulfur Isotope Study

2013 ◽  
Vol 63 (2) ◽  
pp. 119-140 ◽  
Author(s):  
Kofi Adomako-Ansah ◽  
Toshio Mizuta ◽  
Napoleon Q. Hammond ◽  
Daizo Ishiyama ◽  
Takeyuki Ogata ◽  
...  
Keyword(s):  
South Africa ◽  
Greenstone Belt ◽  
Sulfur Isotope ◽  
Gold Mineralization ◽  
Iron Formation ◽  
Banded Iron Formation ◽  
Isotope Study

Structure of veins in a gold–pyrite deposit in banded iron formation, Amalia greenstone belt, South Africa

1986 ◽  
Vol 123 (6) ◽  
pp. 601-609 ◽  
Author(s):  
J. R. Vearncombe
Keyword(s):  
Greenstone Belt ◽  
Quartz Vein ◽  
Gold Mineralization ◽  
Iron Formation ◽  
Banded Iron Formation ◽  
Vein Wall ◽  
Quartz Veins ◽  
Anticlockwise Rotation ◽  
Fibre Growth ◽  
Mineralizing Fluids

AbstractFibrous quartz veins in deformed banded iron formation of the Amalia greenstone belt, southwestern Transvaal, are spatially related to gold–pyrite mineralization in both wallrock and vein inclusions. Poles to quartz vein orientations show a general parallelism with mineral elongation and fold plunges of the principal deformation in the wallrock. Quartz vein fibres show a consistent anticlockwise rotation, late components being subparallel to the elongation lineation, suggesting veining was probably synchronous with the principal deformation. Antitaxial fibrous veins, which dominate the mineralized banded iron formation, formed by the process of crack–seal which channelled mineralizing fluids along the vein walls, increasing the potential for fluid–wallrock interaction. Gold mineralization in quartz veins occurs in wall-parallel slivers of banded iron formation which have been plucked off the vein wall during antitaxial fibre growth. Mineralization can be explained by a process of fluid–wallrock interaction with sulphidation and gold precipitation.

The application of the mise-a-la-masse electrical technique in Greenstone belt gold exploration

1989 ◽  
Vol 20 (2) ◽  
pp. 113
Author(s):  
L.G.B.T. Polomé
Keyword(s):  
Greenstone Belt ◽  
Electrical Potential ◽  
Gold Deposits ◽  
Iron Formation ◽  
Banded Iron Formation ◽  
Current Electrode ◽  
Barberton Greenstone Belt ◽  
A Current ◽  
Ore Zones ◽  
Gold Bearing

Most of the gold deposits in the Barberton Greenstone belt of South Africa are relatively small and in structurally complex geological areas.The mise-a-la-masse electrical technique, where a current electrode is earthed in a mineralised zone, was used on one of our exploration projects consisting of a sulphides/gold-bearing carbonaceous banded iron formation within a succession of mafic, ultramafic and sedimentary rocks. The technique was successful in delineating individual mineralised units within a broad lithological sequence. During the survey, electrical potential measurements were recorded on surface, in underground drives and in twenty five boreholes. Measurements were also repeated by earthing the mineralised zone in a number of boreholes. Major discontinuities were recognised within the ore zones and used to interpret geological structures. These were then used to define specific units for ore reserve calculations and the application of selected mining techniques.

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