Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42A09SE00010

Record: MDI42A09SE00010

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Munro

Latitude: 48° 33' 53.19"    Longitude: -80° 12' 32.63"

UTM Zone: 17    Easting: 558353.197   Northing: 5379377.736    UTM Datum: NAD83

Resident Geologist District: Kirkland Lake

NTS Grid: 42A09SE

Point Location Description: A point 3.03 km north and 4.84 km east of the southwest corner of Munro Township.

Location Method: Conversion from MDI

Access Description: A 20 foot deep shaft is near the east boundary of the northeast quarter of the north half of lot 7, concession II, Munro Township. Access to the shaft area is provided by an old, badly overgrown but ATV passable road (as indicated by Satterly 1952) which may be reached from the east via the Hedman Mine access road in eastern Munro Township.

Exploration History

1929: Young Munro Gold Mines Ltd. incorporated in March (Rogers and Young 1930), succeeding the Young Munro Gold Mining Syndicate (Canadian Mines Handbook 1935). 1935: The Young Munro Gold Mines property consisted of 5 claims in Munro Township. By this time, trenching and at least one shallow shaft had been excavated (Canadian Mines Handbook 1935). 1950: W.T. Stewart held claims in Munro Township, including the 5 claims originally held by Young Munro Gold Mines. A sample of well mineralized material (presumably obtained from the shaft area) is reported (Satterly 1952) to have assayed 0.18 ounce of gold per ton. 1953-1960: W.T. Stewart diamond drilled several short holes at various orientations near the old shaft. 1964: P. Perch diamond drilled three holes totalling 1,426 feet near the southeast quarter of the south half of lot 7, concession III, Munro Township. No assay in excess of trace gold was reported from this drilling. 1974: H.D. Carlson completed a magnetic survey of two claims near the old shaft. McIntyre Mines Ltd. completed magnetic and HL electromagnetic surveys of the south half of the south half of lot 6, concession III, Munro Township. 1979: Amax of Canada Ltd. (now Canamax Resources Inc.) completed magnetic and VLF electromagnetic surveys over a contiguous block of 9 claims which were staked in 1978 and 1979. These included the north half of lot 7, concession II, Munro Township. A geological survey by Amax indicated that grab samples of quartz vein material from the shaft waste pile would assay as high as 7.17 ppm of gold. 1985: Labrador Mining and Exploration Ltd. completed magnetic and HL electromagnetic surveys near the shaft. 1987: D. Lalonde (prospector) completed mechanical overburden stripping and prospected near the old shaft, apparently on claims which Canamax allowed to lapse. 2 bedrock(?) grab(?) samples from the shaft area are reported to have assayed 0.118 and 0.072 oz Au / ton. 1990-1991: Inco Exploration & Technical Services, Inc. completed ground magnetic and HLEM surveys, diamond drilled 8 holes totaling 1177 m and collected numerous samples. Diamond drilling was in the area of the C-Zone

Assessment Work on File

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) - The occurrence is on the south limb of the southeast striking and northwest plunging McCool Hill Syncline, the axis of which is about 4 km northeast of the shaft (Johnstone 1987). About 800 m southwest of the shaft, an extensive swamp marks the location of the southeast striking Munro Fault Zone, a regional scale feature which parallels local stratigraphy and which merges with the the Porcupine-Destor Fault Zone in northern Garrison Township. A recent geophysical survey of Munro Township (OGS 1984) indicates that the occurrence area is one of subdued magnetic relief and that the shaft itself coincides with a weak but persistent (traceable along at least 1,600 m) bedrock conductor oriented subparallel to local bedrock strike. A previous geophysical survey of Munro Township (ODMNA 1971) also indicated the shaft to be associated with a VLF electromagnetic anomaly.

Lithology

Lithology Comments

Dec 07, 2005 (R Degagne) - Bedrock near the shaft consists mainly of variably glacial drift covered east southeast striking, subvertically dipping, and north facing intercalated metamorphosed (greenschist or lower metamorphic facies) tholeiitic and komatiitic volcanic rocks of the (Archean) Stoughton-Roquemaure Group (Johnstone and Trowell 1985, 1984; Jensen and Baker 1986; Johnstone 1987; Canil 1987; Johnstone and Steele 1989; Vagners 1984; McClenaghan et al. 1988, 1987; Steele 1988). Intrusive rocks are limited to narrow (tens of metres in width) north northeast striking diabase dikes of the (Proterozoic) Matachewan swarm (Heaman 1989) (Satterly 1952, Johnstone 1987). Samples from the waste pile collected by A. C. Bath (1987) consist of variably Fe-dolomitic, sericitic, and albitic ultramafic and mafic(?) volcanic rocks which are intruded by narrow (no vein fragment observed in the dump was larger than about 10 cm in width) white to bluish grey quartz-dolomite-albite veins and veinlets. The volcanic rocks hosting the stringers are invariably dolomitic and rusty weathering.

Mineralization

Mineralization Comments

Dec 07, 2005 (R Degagne) - Ore minerals observed by the present writer include pyrite and arsenopyrite, both of which occur most commonly as disseminations within (often foliated) Fe-dolomite. Higher concentrations of sulfide minerals are usually associated with quartz-Fe-dolomite stringers, but no obvious relationship between the presence of stringers and the distribution of sulfide minerals on a hand sample scale was apparent. Pyrite and arsenopyrite were less commonly observed within the veinlets themselves. Chalcopyrite was observed to occur within a veinlet once (sample AB-87-91), as was finely banded fine grained, sucrosic hematite (sample AB-87-88). Gold mineralization at the Stewart occurrence is similar to other gold occurrences in the area (cf. reports for the Lalonde and Walhart occurrences) which are spatially associated with the Munro Fault Zone. Such occurrences are characterized by auriferous quartz-dolomite stringer systems which are hosted by Fe-dolomite and which are mineralized with pyrite and arsenopyrite. Analyses*: AB-87-82 1170 Au ppb, 0.20 Ag ppm, 11 Cu ppm, 5 Pb ppm, 32 Zn ppm, 0.50% As, -- Mo ppm, -- Sb ppm; 1140 Au ppb, AB-87-83 620 Au ppb, NIL Ag ppm, 37 Cu ppm, 23 Pb ppm, 100 Zn ppm, 0.30% As, -- Mo ppm, -- Sb ppm; AB-87-84 110 Au ppb, NIL Ag ppm, 30 Cu ppm, 2 Pb ppm, 92 Zn ppm, 120 As ppm, -- Mo ppm, -- Sb ppm; AB-87-85 110 Au ppb, NIL Ag ppm, 21 Cu ppm, 3 Pb ppm, 361 Zn ppm, 100 As ppm, -- Mo ppm, -- Sb ppm; AB-87-86 2260 Au ppb, 0.03 Ag ppm, 163 Cu ppm, 10 Pb ppm, 149 Zn ppm, 0.20% As, -- Mo ppm, -- Sb ppm; AB-87-87 440 Au ppb, NIL Ag ppm, 17 Cu ppm, 1 Pb ppm, 45 Zn ppm, 0.26% As, -- Mo ppm, -- Sb ppm; AB-87-88 7270 Au ppb, 0.06 Ag ppm, 64 Cu ppm, 8 Pb ppm, 133 Zn ppm, 1.14% AS, 2 Mo ppm, 45 Sb ppm; 7890 Au ppb, AB-87-89 7340 Au ppb, 0.05 Ag ppm, 80 Cu ppm, 9 Pb ppm, 134 Zn ppm, 1.73% As, 2 Mo ppm,, 90 Sb ppm, 7200 Au ppb. * All analyses performed by Timiskaming Testing Laboratory, Cobalt.

Alteration Comments

Dec 07, 2005 (R Degagne) - Samples from the waste pile collected by the present writer consist of variably Fe-dolomitic, sericitic, and albitic ultramafic and mafic(?) volcanic rocks which are intruded by narrow (no vein fragment observed in the dump was larger than about 10 cm in width) white to bluish grey quartz-dolomite-albite veins and veinlets. The volcanic rocks hosting the stringers are invariably dolomitic and rusty weathering. One sample (AB-87-85) indicates a complex, multiphase history of deformation and vein emplacement. Ore minerals observed include pyrite and arsenopyrite, both of which occur most commonly as disseminations within (often foliated) Fe-dolomite.

Mineral Record Details

Mineral Zones - Size and Shape

Rank: 1       Structure Type: Shear

Site Visit Information

Date: Feb 05, 1997

Geologist: R Degagne

Notes: Visited in 1987 by A. C. Bath (OFR 5735, V.1, p.350)Gold mineralization at the Stewart occurrence is similar to other gold occurrences in the area (cf. reports for the Lalondeand Walhart occurrences) which are spatially associated with the Munro Fault Zone. Such occurrences are characterized by auriferous quartz-dolomite stringer systems which are hosted by Fe-dolomite and which are mineralized with pyrite andarsenopyrite. The Stewart occurrence is important because it represents a Munro Fault Zone type occurrence which is notdirectly associated with the Munro Fault Zone proper (it is approximately 800 m northeast of the Fault Zone, as indicatedby Johnstone (1987) and Satterly (1952). Hence, this type ofgold mineralization might reasonably be expected to occur up to about 1 km (and perhaps farther) away from the margins of similar fault zones as they appear on geologic maps.Examination of assay data generated by the present writer reveals that the Stewart stringer system contains anomalouslyelevated gold values. Consistently reproducible anomalously elevated assays here may indicate that gold is intimatelyassociated with sulfide minerals (pyrite and/or arsenopyrite) rather than occurring as vein hosted free gold. In general,anomalously high gold assays appear to be associated with anomalously elevated arsenic values, suggesting that arsenicmight a be useful pathfinder element for this type of gold mineralization. Copper (less than 163 ppm) and lead (less than23 ppm) assays are uniformly low, and zinc assays are erratic and variable in magnitude (ranging from 45-361 ppm).

References

File - Resident Geologist files KL-3726, KL-5035

Publication Number: Date:

Author:

Publisher Name:

Location: Kirkland Lake RGP office

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:

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:

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:

Part - Geology of Munro Township

Publication Number: ARV60-08 Page: 52  Date: 1997

Author: Satterly J.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Black River-Matheson Area

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

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

Publisher Name:

Location:

Mono - Gold deposits of Ontario, part 1, districts of Algoma, Cochrane, Kenora, Rainy River, and Thunder Bay

Publication Number: MDC013 Page: 134  Date: 1971

Author: Ferguson S.A., Groen H.A., Haynes R.

Publisher Name: Ontario Dept. of Mines and Northern Affairs

Location:

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

Publication Number: OFR5467 Page: G0001  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:

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

Publication Number: OFR5735 Page: 348-357  Date: 1990

Author: Bath A.C.

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 - 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:

Part - Statistical review of Ontario's mineral industry in 1929

Publication Number: ARV39-01.001 Date: 1997

Author: Rogers W.R., Young A.C.

Publisher Name: Ontario Dept. of Mines

Location:

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