Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42I04NE00010

Record: MDI42I04NE00010

General

Commodities

Primary Commodities: Uranium, Thorium

Location

Township or Area: Pitt

Latitude: 50° 10' 23.22"    Longitude: -81° 37' 17.28"

UTM Zone: 17    Easting: 455621.54   Northing: 5558063.62    UTM Datum: NAD83

Resident Geologist District: Timmins

NTS Grid: 42I04NE

Point Location Description: Vein on east bank of Abitibi R., 2000 ft north of head of Rapids (now flooded)

Location Method: Data Compilation

Access Description: Occurrence located approx. 80 miles NNE of Cochrane, 4 miles SSE of Coral Rapids. Ontario Northland Railway passes 1/4 mile to the west of site; at mileage 91.7, a 1500' trail leads to river crossing north of Rapids; portage 30 chains to the north and then strike back to river for 300 feet. Showing located on former claim T28721. (From SMDR; T-217; Hogg PR, 1948).

Exploration History

1947--Calmor Mines Ltd.: Vein discovered / 1948--Moneta Porcupine Mines Ltd: Detailed geiger counter survey, assays and geological reconnaissance survey 1993--Alcanex Ltd./G-10 Syndicate: Amag survey; regional river gravel sampling (1 ton bulk sample OP-93-5 taken at mouth of small creek, E bank of Abitibi R., SE of Calmor locn) (T 3695) 2002--McKinnon Prospecting: Ground mag survey and preliminary mapping on east bank of river, slightly north of Calmor locn (T-4708).

Assessment Work on File

Geology

Province: Superior

Subprovince: Quetico

Geological Age: Early Precambrian  

Geology Comments

Nov 24, 2014 (D Draper) - Carbonate veins, probably of post-Middle Devonian age, cuts Early Precambrian gneiss within a pronounced fracture zone. The primary occurrence was a vein averaging 0.5 ft in width, 240 ft in length, striking magnetic north, dipping 75 degrees west. A second vein about 10 feet to the east strikes due north, dipping 65 - 70 degrees west, was exposed for 70 feet. The occurrence is situated on the escarpment that marks the contact of the Precambrian rocks to the south and the James Bay Basin Paleozoic rocks to the north. (SMDR 0141) This contact crosses the Abitibi River in an east-west line just above Sextant portage, about 2 miles down-river from the occurrence

Lithology

Lithology Comments

Dec 07, 2005 (D Draper) - Two carbonate (impure dolomite) veins cut Early Precambrian gneiss and diabase. A lamprophyre dyke roughly parallels the veins 250 ft to the west. Quote: The association of the vein and the lamprophyre dykes with north-south fracture zones suggests that they may be closely related in age, and that the carbonate vein containing radioactive mineral may be younger than many of the Paleozoic sediments. While this carbonate is referred to...as a vein, there is some possibility...that it is a lamprophyre dyke replaced by carbonates. (Hogg, PR 1948-7).

Mineralization

Mineralization Comments

Nov 24, 2014 (D Draper) - The radioactive minerals present are pitchblende and monazite with some minor radioactivity being present in the pegmatites. Both carbonate veins contain some specularite, pyrite and chalcopyrite. Three samples from the main vein assayed 0.03%, 0.12% and 0.055% U3O8/RE. (SMDR 0141). The mineral producing radioactivity in the pegmatites was not isolated. The carbonate vein material is probably impure dolomite. Disseminated specularite occurs throughout the vein as well as sparce py and cp. There is some evidence that the radioactivity is directly proportionate to the amount of specular hematite. Some of the lamprophyre dikes in the vicinity also contain specularite, pyrite and chalcopyrite. (PR 1948-7). Assay results of 7 samples of the vein reported by the GSC ranged from 0.04% to 0.130% U3O8/RE (GSC EGR 16). NOTE: 1949 correspondance in T-217 indicates that the black, weakly radioactive mineral identified as monazite may have been zircon. (See Hogg-Burton letters).

Mineral Record Details

References

File - Resident Geologist files T-0217

Publication Number: Date:

Author:

Publisher Name:

Location: Timmins RGP office

Map - Otter Rapids sheet, District of Cochrane, geological compilation series

Publication Number: P0370 Scale: 1:126,720    Date: 1997

Author: Bennett G., Brown D.D., George P.T.

Publisher Name: Ontario Dept. of Mines

Location:

Publication - Canadian deposits of uranium and thorium; Geological Survey of Canada, Economic Geology Series 16

Publication Number: GSC EconGeol 16 Page: 150  Date: 1952

Author: Lang, A.H.

Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/102450

Mono - Report on Mosher discovery of radioactive mineral, Pitt Township, District of Cochrane

Publication Number: PR1948-07 Date: 1998

Author: Hogg N.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Uranium and thorium deposits of northern Ontario

Publication Number: MDC009 Page: 55  Date: 1968

Author: Robertson J.A.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Uranium and thorium deposits of northern Ontario

Publication Number: MDC025 Page: 71  Date: 1984

Author: Robertson J.A., Gould K.L.

Publisher Name: Ontario Geological Survey

Location:

Publication - Canadian deposits of uranium and thorium; Geological Survey of Canada, Economic Geology Series 16

Publication Number: GSC EconGeol 16 Page: 276  Date: 1952

Author: Lang, A.H.

Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/102450

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For detailed information regarding this mineral record please contact the Timmins Resident Geologist District Office