scholarly journals Metallogeny of the Gold Deposits in the Dickenson Mine, Red Lake, northwestern Ontario : a Preliminary Report

1980 ◽  
Author(s):  
J H Crocket ◽  
R T M Kusmirski
Keyword(s):  
Preliminary Report ◽  
Gold Deposits ◽  
Red Lake ◽  
Northwestern Ontario

U–Pb zircon ages for magmatism in the Red Lake greenstone belt, northwestern Ontario

1986 ◽  
Vol 23 (1) ◽  
pp. 27-42 ◽  
Author(s):  
F. Corfu ◽  
H. Wallace
Keyword(s):  
Greenstone Belt ◽  
Volcanic Rocks ◽  
Gold Deposits ◽  
Calc Alkaline ◽  
Red Lake ◽  
Northwestern Ontario ◽  
Igneous Activity ◽  
Felsic Volcanic ◽  
Felsic Volcanic Rocks ◽  
Chemical Sediments

U–Pb dating was carried out on nine volcanic rocks and two felsic intrusions from the Red Lake greenstone belt in order to establish an absolute time framework for the magmatic evolution of the area and yield first indications on the time of deformation and gold mineralization.The data indicate a protracted period of igneous activity spanning at least 270 Ma. Felsic volcanic rocks near the top of the tholeiitic to komatiitic sequence in the eastern part of the belt yield ages of [Formula: see text] and [Formula: see text]. A third unit, dated at [Formula: see text], contains inherited zircons older than 2982 Ma, which casts some uncertainty on the validity of the inferred intercept age. Rocks in the western part of the belt, previously believed to form a relatively young calc-alkalic sequence but now known to be dominantly tholeiitic, are shown to be relatively old, with ages of [Formula: see text] and [Formula: see text]. These two dates also bracket the age of stromatolites occurring in chemical sediments that are under and overlain by the dated units.Another volcanic horizon in the centre of the belt is dated at 2830 ± 15 Ma, and calc-alkaline volcanic sequences on the southern and northern flanks of the belt yield ages of 2739.0 ± 3.0 and [Formula: see text], respectively. An age of [Formula: see text] was determined for tholeiitic pyroclastic rocks near the base of the predominantly calc-alkaline Heyson sequence.The major gold deposits of the Red Lake belt appear to be present dominantly within older supracrustal sequences. On the other hand, they are also associated with late deformation zones that postdate the intrusion of the Dome Stock dated at 2718.2 ± 1.1 Ma ago. The time of an earlier folding event is bracketed by this age and by the age of [Formula: see text] for an isoclinally folded felsic dike.

A detailed gravity profile across the English River Subprovince, northwestern Ontario

1984 ◽  
Vol 21 (2) ◽  
pp. 145-151 ◽  
Author(s):  
V. K. Gupta ◽  
R. B. Barlow
Keyword(s):  
Seismic Data ◽  
Bouguer Anomaly ◽  
Density Data ◽  
Density Measurements ◽  
Anomaly Field ◽  
Red Lake ◽  
Northwestern Ontario ◽  
Crustal Model ◽  
Regional Gravity ◽  
Gravity Profile

This paper presents the results of a detailed gravity profile measured across the two lithotectonic domains of the English River Subprovince from Vermilion Bay to Red Lake, a distance of 190 km, in northwestern Ontario. Along the profile 283 fresh rock samples were collected for density measurements. The density data clearly suggest that there is a measurable and significant density difference between the migmatized metasediments and plutonic rocks.A crustal model based on the seismic data, along the profile, has been used for computing a regional gravity field, which in turn has been used in isolating the residual anomalies from the Bouguer anomaly field. A strong correlation has been found to exist between the residual anomalies, the rock densities, and the surface lithologies. The Northern Supracrustal Domain, which is at its widest (60 km) along the profile, is dominated by a pronounced 15 mGal (150 μm s−2) positive residual anomaly believed to be caused by outcropping, anomalously dense metasediments extending to a modelled depth of approximately 10 km. In the Southern Plutonic Domain the residual anomalies along the profile are small (less than 5 mGal (50 μm s−2)) and limited in depth. The Mystery Lake dome extends to a modelled depth of approximately 2.5 km.

Alteration, mineralization, and metamorphism in the area of the East South "C" ore zone, 24th level of the Dickenson mine, Red Lake, northwestern Ontario

1984 ◽  
Vol 21 (1) ◽  
pp. 35-52 ◽  
Author(s):  
Neil A. Mathieson ◽  
C. Jay Hodgson
Keyword(s):  
Volcanic Rocks ◽  
Fluid Pressure ◽  
Chemical Effect ◽  
Iron Formation ◽  
Mesoscopic Scale ◽  
Red Lake ◽  
Northwestern Ontario ◽  
Mineral Associations ◽  
Mineral Assemblages ◽  
Volcaniclastic Rocks

The area of the East South "C" (ESC) orebody of the Dickenson mine, Red Lake, consists of variably altered and mineralized basalt, basaltic volcaniclastic rocks, minor sulphidic iron formation, and a series of mainly postdeformation dykes. Except for the dykes, the rocks are in general well foliated. The macroscopic structural geometry of the stratiform rocks has been determined to a large extent by movement on schistosity-parallel faults.Three broad types of mineralization or alteration are recognized: an Na–Ca–Mg depletion with associated Fe–Mn enrichment controlled by primary permeable structures in basalt; a series of carbonate and quartz or "chert" veins emplaced into fissures; and auriferous silicified and sulphidized zones controlled by vein-filled fractures. The last is the main mineralization type in the ESC orebody on the 24th level of the mine, which was the focus of this study. Although all mineralization types occur within the mine, they are not directly associated either temporally or spatially on a mesoscopic scale. All, however, appear to have been overprinted by or formed synchronously with the amphibolite-facies metamorphism.A rich variety of metamorphic mineral assemblages occurs in the volcanic rocks because of the chemical effect of pre- or synmetamorphic hydrothermal alteration. These assemblages and the composition and mineral associations of arsenopyrite in the ESC orebody closely constrain the conditions of metamorphism to 520–540 °C and 3.8–4.2 kbar (380–420 MPa) fluid pressure.

scholarly journals Characterization of hydrothermal alterations at the Red Lake mine, northwestern Ontario

2006 ◽  
Author(s):  
A -M Cadieux ◽  
B Dubé ◽  
K Williamson ◽  
M Malo ◽  
T Twomey
Keyword(s):  
Red Lake ◽  
Northwestern Ontario

scholarly journals Preliminary report on the gold deposits at Al Habla, Kingdom of Saudi Arabia

1985 ◽  
Author(s):  
C.W. Smith ◽  
R.M. Samater ◽  
M.A. Hussain ◽  
M.A. Basheer ◽  
V.A. Trent ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Preliminary Report ◽  
Gold Deposits ◽  
Kingdom Of Saudi Arabia

Feeding Sites of Aphids of the Genus Cinara Curtis (Homoptera: Aphididae) in Northwestern Ontario

1959 ◽  
Vol 91 (10) ◽  
pp. 670-671 ◽  
Author(s):  
G. A. Bradley
Keyword(s):  
Black Spruce ◽  
Jack Pine ◽  
Red Pine ◽  
Balsam Fir ◽  
White Pine ◽  
White Cedar ◽  
Feeding Sites ◽  
Red Lake ◽  
Northwestern Ontario ◽  
Common Juniper

While working at Cedar Lake in Northwestern Ontario in the summers of 1957 and 1958 the author was able to observe the feeding sites of various species of Cinara. Most of the observations were made within an area of a few square miles on either side of Highway 105, between Red Lake Road and Ear Falls, Ontario. This area is fairly typical of the Laurentian Shield, with numerous lakes, rocky ridges, sandy patches, and small bogs. The principal coniferous trees in this locality are black spruce, jack pine, and balsam fir. White spruce, white cedar, white pine, red pine, and common juniper are also present.

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