Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42A09SW00002

Record: MDI42A09SW00002

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Munro

Latitude: 48° 32' 58.12"    Longitude: -80° 15' 31.54"

UTM Zone: 17    Easting: 554703.18   Northing: 5377640.721    UTM Datum: NAD83

Resident Geologist District: Kirkland Lake

NTS Grid: 42A09SW

Point Location Description: A point 1.30 km north and 1.21 km east of the southwest corner of Munro Township.

Location Method: Conversion from MDI

Access Description: Old shafts, pits, and trenches are in the (patented) north half of lot 11, concession I, Munro Township immediately east of the Canadian Johns-Manville Co. Ltd. Munro (asbestos) Mine access road. The workings may be reached by foot via this paved road, which intersects Highway 101 near the southwest corner of Munro Township. A 2-3 m wide overgrown water filled ditch too wide for jumping for most of its length is immediately east of the access road, but scattered beaver dams, deadfall bridging the ditch and a rotting wooden bridge located (Satterly 1952) where an overgrown trail joins the access road all provide access to the workings.

Exploration History

1916: BURTON-MUNROE MINES: 1,000 ft DD, trenching on 4 ft wide qtz vein. 1917: BURTON-MUNROE MINES: steam installed on site; No. 1 shaft extended to 318 ft.; stations established at 148 and 300 ft levels where 96 and 735 ft , respectively, of lateral exploration was completed. 1918: BURTON-MUNROE MINES: operations suspended. 1929: BROWN-MUNRO GOLD MINES LTD: was incorporated, acquires property. 1937: BROWN-MUNRO GOLD MINES LTD: at least one 196 ft DDH drilled to test vein (a 25 ft brecciated core section assayed 0.03 oz Au/ ton over 2 ft and 0.116 oz Au/ ton over 1 ft), 1961: MUNRO-CROESUS GOLD MINES LTD.: controls shares of BROWN-MUNRO GOLD MINES LTD. 1964: BROWN-MUNRO GOLD MINES LTD: Ontario charter cancelled.

Geology

Province: Superior

Subprovince: Abitibi

Terrane: Wawa-Abitibi

Belt: Abitibi

Tectonic Assemblage: Stoughton-Roquemaure

Geological Age: Mesoarchean  

Metamorphism Grade: Greenschist

Geology Comments

Dec 07, 2005 (R Degagne) - Volcanic rocks occupy part of the south limb of the McCool Hill Syncline, the southeast striking and northwest plunging axis of which is about 6.8 km northeast of the workings. About 400 m southwest of the workings, along the southeast striking Contact Fault, tholeiitic basalts of the Stoughton-Roquemaure Group are in disconformable (Johnstone and Trowell 1985) contact with southeast striking, north facing and subvertically dipping weakly metamorphosed turbiditic wackes of the (Archean) Porcupine Group. About 1.6 km northeast of the shaft area, an extensive swamp marks the position of the (locally) southeast striking Munro Fault Zone, a regional scale feature which is several hundred metres wide and which strikes subparallel to local stratigraphy. Several late, north northeast striking cross faults across which ore developed limited associated apparent (usually dextral) components of horizontal displacement occur in the area (Johnstone 1987, Satterly 1952). The Contact Fault, separating volcanic rocks of the Stoughton-Roquemaure Group to the northeast from Porcupine Group sedimentary rocks to the southwest is characterized in the area as a locus of carbonatization and sericitization and may host quartz- carbonate vein systems (Johnstone and Trowell 1985). It has been suggested (Johnstone and Trowell 1984) that movement along the Contact Fault was mainly normal, with the sense of motion being north side down.

Lithology

Lithology Comments

Dec 07, 2005 (R Degagne) - The shafts, pits, and trenches are blasted into a sequence of variably glacial drift covered metamorphosed (greenschist or lower metamorphic facies) pillowed, massive, and variolitic tholeiitic basalts of the (Archean) Stoughton-Roquemaure Group which, on the property, are southeast striking, steeply north dipping to vertical and north facing (Satterly 1952; Johnstone and Trowell 1985, 1984; Jensen and Baker 1986; Johnstone 1987; Johnstone and Steele 1989; Vagners 1984; McClenaghan et al. 1988, 1987; Steele 1988). Intrusive rocks in the area include a series of thick layered mafic to ultramafic sills which are exposed south of the Munro Fault Zone near and exposed within the (now flooded) Canadian Johns-Manville Co Ltd. Munro (asbestos) Mine open pit. These intrusive bodies are about 1,200 m north of the shaft area. Narrow (tens of metres in width) generally north striking diabase dikes of the (Proterozoic) Matachewan swarm (Heaman 1989) also occur in the area. The nearest of these dikes is about 800 m east of the shaft area. Narrow (metre scale) lamprophyre dikes also occur (Satterly 1952).

Mineralization

Mineralization Comments

Dec 07, 2005 (R Degagne) - Sulfide minerals at the No.1 shaft include pyrite, arsenopyrite, chalcopyrite, bornite, and sphalerite which are associated with quartz-dolomite-tourmaline veins hosted by carbonatized and variably sheared basalt. Sulfide minerals at the Nos.2 and 3 shaft include pyrite, arsenopyrite, chalcopyrite, and sphalerite. Sulfide minerals here occur both within and marginal to quartz-dolomite veins and veinlets (some of which are sheeted (banded) in appearance) which are oriented at azimuth 052, dip 25-30 degrees southeast, and which occur within a narrow (up to 3 m wide locally) shear developed in basalt. Sulfide minerals at the No.4 shaft include pyrite and arsenopyrite. The sulfide minerals here occur within and marginal to quartz-dolomite-(albite?) veinlets and vein breccias developed in variably foliated and carbonatized (Fe-dolomite and/or calcite) variolitic basalt and volcaniclastic sediments. Quartz veinlets in samples of dump material (samples AB-86-10,-12, -14, -15, and -16) generally consist of narrow (less than 1 cm wide) clear and glassy to milky white and opaque quartz-Fe-dolomite hosted by nonmagnetic, nonfoliated to weakly foliated, and penetratively Fe-dolomitized light grey to buff colored basalt. The veins and veinlets are rarely composite or sheeted in appearance, although one sample (AB-86-14) consists of quartz vein material containing seams of fine grained acicular tourmaline. Gangue minerals associated with the vein mineralization included white and grey quartz, black tourmaline, and Fe-dolomite. In waste pile samples lacking vein material, (presumably originally located relatively distal to veins), porosity-controlled calcite is present. Ore minerals observed by the present writer included pyrite, arsenopyrite, chalcopyrite, bornite and honey colored sphalerite (within the veinlets) and pyrite and chalcopyrite marginal to the veinlets in the (usually dolomitic) host basalt. Galena was reported to be present here by Satterly(1952).

Alteration Comments

Dec 07, 2005 (R Degagne) - NO. 1 SHAFT: Sulfide minerals at the No.1 shaft include pyrite, arsenopyrite, chalcopyrite, bornite, and sphalerite which are associated with quartz-dolomite-tourmaline veins hosted by carbonatized and variably sheared basalt. Proximal to veins (and/or the shear), basalts display both penetrative and porosity controlled dolomitization and/or porosity controlled silicification (samples AB-86-10, -11, -12,-13, -15, and -16) while in samples devoid of vein material (presumably relatively vein/shear distal), carbonatization as calcite is developed (sample AB-86-09). NO. 2 and 3 SHAFT: Foliation development in the host rock is limited to within a few decimetres of the vein margins, and is manifested by dolomite-sericite schist development. At distances of up to several metres from the shear zone margins, however, rusty weathering dolomitization effects are evident magascopically. NO. 4 SHAFT: Sulfide minerals at the No.4 shaft include pyrite and arsenopyrite. The sulfide minerals here occur within and marginal to quartz-dolomite-(albite?) veinlets and vein breccias developed in variably foliated and carbonatized (Fe- dolomite and/or calcite) variolitic basalt and volcaniclastic sediments.

Mineral Record Details

Mineral Zones - Size and Shape

Rank: 1       Structure Type: Shear

Rank: 1       Structure Type: Shear

Rank: 1       Structure Type: Shear

Rank: 1       Structure Type: Shear

Site Visit Information

Date: Jan 29, 1997

Geologist: R Degagne

Notes: A.C.Bath(OFR5735,V.1,OGS,p.241).Analyses*:AB-86-01 2596 Auppb, ---- Agppm, 18450 Asppm, ---- Cuppm, --- Pbppm, --- Znppm, -- Moppm. AB-86-02 1575 Auppb, ---- Agppm, 9590 Asppm, ---- Cuppm, --- Pbppm, --- Znppm, -- Moppm.AB-86-03 10882 Auppb, --- Agppm, - 25810 Asppm, ---- Cuppm, --- Pbppm, --- Znppm, -- Moppm.AB-86-04 3730 Auppb, ---- Agppm, 7370 Asppm, ---- Cuppm, --- Pbppm, --- Znppm, -- Moppm.AB-86-05 192 Auppb, ---- Agppm, 1840 Asppm, ---- Cuppm, --- Pbppm, --- Znppm, -- Moppm.AB-86-06 428 Auppb, 1.5 Agppm, 1030 Asppm, 58.4 Cuppm, 293 Pbppm, 242 Znppm, <5 Moppm.AB-86-07 9238 Auppb, 61.4 Agppm, 18450 Asppm, 5.4 Cuppm, 443 Pbppm, 477 Znppm, <5 Moppm.AB-86-08 927 Auppb, ---- Agppm, 2210 Asppm, ---- Cuppm, --- Pbppm, --- Znppm, -- Moppm.AB-86-10 142 Auppb, <1.0 Agppm, 111 Asppm, 42.5 Cuppm, 348 Pbppm, 543 Znppm, <5 Moppm.AB-86-11 20 Auppb, 7.9 Agppm, 129 Asppm, 41.8 Cuppm, 327 Pbppm, 413 Znppm, <5 Moppm.AB-86-15 2260 Auppb, 5.31 Agppm, 270 Asppm, 43.8 Cuppm, 571 Pbppm, 148 Znppm, <5 Moppm.AB-86-16 416 Auppb, ---- Agppm, 295 Asppm, ---- Cuppm, --- Pbppm, --- Znppm, -- Moppm.AB-86-18 1301 Auppb, ---- Agppm, 203 Asppm, ---- Cuppm, --- Pbppm, --- Znppm, -- Moppm.AB-86-19 4540 Auppb, ---- Agppm, 442 Asppm, ---- Cuppm, --- Pbppm, --- Znppm, -- Moppm.AB-86-22 1973 Auppb, ---- Agppm, 3320 Asppm, ---- Cuppm, --- Pbppm, --- Znppm, -- Moppm.AB-86-25 1836 Auppb, 3.3 Agppm, 1198 Asppm, 13.6 Cuppm, 283 Pbppm, 245 Znppm, <5 Moppm. *All assays performed by Accurassay Lab.Ltd.,Kirkland Lk.Further exploration in the area,if warranted,should concentrate on locating additional NE-N shears in the area (cf. also reports for the Guinea occurrence, Stewart-Abate deposit and Croesus Mine)are known to carry anomalously elevated Au values.Elevated As values occur at sites sampled,indicating that As may be a useful pathfinder element for additional occurrences of analogous Au mineraliz. Locally(shear proximally)developed,carbonatiz may assist in locating other auriferous shear systems.

References

Map - Black River-Matheson Area

Publication Number: OFM0013 Scale: 1:15,840    Date: 1985

Author: Johnstone R.M., Trowell N.F.

Publisher Name:

Location:

Map - Geological series, bedrock samples from the sonic drilling program 1987, Matheson area, District of Cochrane

Publication Number: P3114 Scale: 1:100,000    Date: 1989

Author: Johnstone R.M., Sutcliffe R.H., Steele K.G., Baker C.L., McClenaghan M.B.

Publisher Name: Ontario Geological Survey

Location:

Part - Geology of Munro Township

Publication Number: ARV60-08 Page: 46-47  Date: 1997

Author: Satterly J.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Township of Munro, District of Cochrane, Ontario

Publication Number: M1951-05 Date: 1997

Author: Satterly J., Hogg N.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Preliminary report on the Timmins-Kirkland Lake area, gold deposits file

Publication Number: OFR5467 Page: G0008  Date: 1983

Author: Hodgson C.J.

Publisher Name: Ontario Geological Survey

Location:

Folio - Munro Township, District of Cochrane

Publication Number: GDIF361 Date: 1997

Author: Kirkland Lake RGO

Publisher Name: Ontario Geological Survey

Location:

Map - Geophysical/geochemical series, Matheson-Black River area, Munro Township, airborne electromagnetic survey, total intensity magnetic survey, District of Cochrane

Publication Number: M80586 Scale: 1:20,000    Date: 1984

Author: Questor Surveys Ltd.

Publisher Name: Ontario Geological Survey

Location:

Map - Quaternary geology of Matheson area, Cochrane District

Publication Number: P2735 Scale: 1:50,000    Date: 1985

Author: Vagners U.J.

Publisher Name: Ontario Geological Survey

Location:

Mono - Mineral occurrences, deposits, and mines of the Black River-Matheson area

Publication Number: OFR5735 Page: 238-255  Date: 1990

Author: Bath A.C.

Publisher Name: Ontario Geological Survey

Location:

Article - Quaternary geology and geochemical exploration in the Matheson area

Publication Number: MP140.294 Date: 1997

Author: McClenaghan M.B., Lavin O.P., Nichol I., Shaw J.

Publisher Name: Ontario Geological Survey

Location:

Article - Precambrian geology of the Black River-Matheson (BRIM) area, District of Cochrane

Publication Number: MP126.056S Date: 1997

Author: Johnstone R.M., Trowell N.F.

Publisher Name: Ontario Geological Survey

Location:

Article - Precambrian geology of the Black River-Matheson (BRIM) area, District of Cochrane

Publication Number: MP119.050S Page: 291-296  Date: 1997

Author: Johnstone R.M., Trowell N.F.

Publisher Name: Ontario Geological Survey

Location:

Report an Error

We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.

Terms of Use

Please review our Terms of Use agreement for this data product.

Ministry Contact Information

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