Colline Morin, Thertford mine region, Quebec, Canada
Last Updated: 29th Feb 2024By Fred A. Schuster
COLLINE MORIN
46°00'51"N 71°17'11"W
I was on a trip looking for the American Chrome mines I took this dirt road that was off of the road , off of the Chemin du Lac Caribou,
The Saint-Joseph-de-Coleraine, in the MRC des Les Appalaches Regional County Municipality, in the administrative region of Chaudière-Appalaches, in Quebec
On my way to these mines I passed a hill on the left of the trail. I did not have the resources to climb up the field opening but I observed some interesting formations in the stream bed that formed in the trail
The water cleaned the bedrock and glacial boulders off so I could see some geology I never found this mine but I took these photos from exposed rock”
map showing general area of colline morin
Dunite with Chromite
Below is a translation of the SIGEOM survey of the location
Mineralized zone name : Colline Morin
Year of discovery : 1909
Location reference : A small excavation (4.5 m x 2 m x 3 m) locates this deposit at the foot of Morin Hill, on its NW side, about 2.1 km east of Caribou Lake and 2.2 km west of Rond Lake.
Comment - morphology : Mineralization is stratiform and occurs in an area measuring 1.2 m by 75 cm.
Comment - discovery : The outcropping showing was discovered by prospecting in 1909.
Comment - lithology : The deposit is part of the Thetford Mines ophiolitic complex. Six beds of massive chromite and disseminated chromite occur within a serpentinized dunite with chrysotile veinlets. The fresh color of the dunite is dark to medium v ert, while the weathered surface is buff rust-brown. The dunite is homogeneous, slightly foliated in places and has a brecciated facies restricted to a band about two meters thick. The dunite contains a pyroxenite-wherlite mas se about 6 m in diameter. The contact between these two lithological assemblages is frank but irregular in shape (GM 52675). This is the only place where some pyroxenite samples, in
In addition, dunite samples show a Hall texture (GM 52651). Morin Hill is composed of impure feldspathic quartzite.
Comment - mineralization : Marcotte (1980) reports that this deposit apparently contained six beds of massive chromite. The mineralization now observed consists of 1 to 2% disseminated chromite. Chromite grains are at most 1 mm in diameter. The stockpiles contain Hall-textured ore samples (GM 52651).
Comment - substance : Grades: Selected sample (MB 89-20): 1: 2900 ppm Cr; Selected sample (Denis, 1932, RAP.AN.1931- D): 51.09% Cr2O3 (34.96% Cr); Selected samples (GM 52651): 209355: 21.01% Cr2O3 (14.38% Cr), 1101 ppb EGP (806 ppb Pt and 295 ppb Pd); 209356: 36.78% Cr2O3 (25.17% Cr), 1829 ppb EGP (1345 ppb Pt and 484 ppb Pd); 209357: 14.56% Cr2O3 (9.96% Cr), 527 ppb EGP (386 ppb Pt and 141 ppb Pd); 209358: 19.84% Cr2O3 (13.58% Cr), 642 ppb EGP (479 ppb Pt and 163 ppb Pd).
Comment - structural control : The quartzite shows a bedding oriented N345/47. The chromite appears to follow the magmatic bedding.
Comment - alteration : No information.
Typology : Stratiform chromite mineralization
Typology : This stratiform chromite deposit is associated with the dunitic horizon at the base of the cumulate sequence of the Thetford Mines Ophiolitic Complex. Genesis: Fractional crystallization and gravity deposition. Interdigitat ion of chromite and dunite results from the action of convection currents or variations in the rate of deposition. Possibility of liquid immiscibility.
Production comment : 50 tonnes of low-grade ore are reported to have been extracted from this deposit.
46°00'51"N 71°17'11"W
I was on a trip looking for the American Chrome mines I took this dirt road that was off of the road , off of the Chemin du Lac Caribou,
The Saint-Joseph-de-Coleraine, in the MRC des Les Appalaches Regional County Municipality, in the administrative region of Chaudière-Appalaches, in Quebec
On my way to these mines I passed a hill on the left of the trail. I did not have the resources to climb up the field opening but I observed some interesting formations in the stream bed that formed in the trail
The water cleaned the bedrock and glacial boulders off so I could see some geology I never found this mine but I took these photos from exposed rock”
Aerial map
map showing general area of colline morin
Dunite with Chromite
Dunite with Chromite
Below is a translation of the SIGEOM survey of the location
Mineralized zone name : Colline Morin
Year of discovery : 1909
Location reference : A small excavation (4.5 m x 2 m x 3 m) locates this deposit at the foot of Morin Hill, on its NW side, about 2.1 km east of Caribou Lake and 2.2 km west of Rond Lake.
Comment - morphology : Mineralization is stratiform and occurs in an area measuring 1.2 m by 75 cm.
Comment - discovery : The outcropping showing was discovered by prospecting in 1909.
Comment - lithology : The deposit is part of the Thetford Mines ophiolitic complex. Six beds of massive chromite and disseminated chromite occur within a serpentinized dunite with chrysotile veinlets. The fresh color of the dunite is dark to medium v ert, while the weathered surface is buff rust-brown. The dunite is homogeneous, slightly foliated in places and has a brecciated facies restricted to a band about two meters thick. The dunite contains a pyroxenite-wherlite mas se about 6 m in diameter. The contact between these two lithological assemblages is frank but irregular in shape (GM 52675). This is the only place where some pyroxenite samples, in
In addition, dunite samples show a Hall texture (GM 52651). Morin Hill is composed of impure feldspathic quartzite.
Comment - mineralization : Marcotte (1980) reports that this deposit apparently contained six beds of massive chromite. The mineralization now observed consists of 1 to 2% disseminated chromite. Chromite grains are at most 1 mm in diameter. The stockpiles contain Hall-textured ore samples (GM 52651).
Comment - substance : Grades: Selected sample (MB 89-20): 1: 2900 ppm Cr; Selected sample (Denis, 1932, RAP.AN.1931- D): 51.09% Cr2O3 (34.96% Cr); Selected samples (GM 52651): 209355: 21.01% Cr2O3 (14.38% Cr), 1101 ppb EGP (806 ppb Pt and 295 ppb Pd); 209356: 36.78% Cr2O3 (25.17% Cr), 1829 ppb EGP (1345 ppb Pt and 484 ppb Pd); 209357: 14.56% Cr2O3 (9.96% Cr), 527 ppb EGP (386 ppb Pt and 141 ppb Pd); 209358: 19.84% Cr2O3 (13.58% Cr), 642 ppb EGP (479 ppb Pt and 163 ppb Pd).
Comment - structural control : The quartzite shows a bedding oriented N345/47. The chromite appears to follow the magmatic bedding.
Comment - alteration : No information.
Typology : Stratiform chromite mineralization
Typology : This stratiform chromite deposit is associated with the dunitic horizon at the base of the cumulate sequence of the Thetford Mines Ophiolitic Complex. Genesis: Fractional crystallization and gravity deposition. Interdigitat ion of chromite and dunite results from the action of convection currents or variations in the rate of deposition. Possibility of liquid immiscibility.
Production comment : 50 tonnes of low-grade ore are reported to have been extracted from this deposit.
Article has been viewed at least 1624 times.
