Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42A08NW00151

Record: MDI42A08NW00151

General

Commodities

Primary Commodities: Gold, Zinc

Secondary Commodities: Copper, Lead

Location

Township or Area: Bowman

Latitude: 48° 28' 22.1"    Longitude: -80° 29' 20.92"

UTM Zone: 17    Easting: 537758.02   Northing: 5368978.73    UTM Datum: NAD83

Resident Geologist District: Kirkland Lake

NTS Grid: 42A08NW

Point Location Description: Pits

Location Method: Data Compilation

Access Description: Access to within a few hundred metres of pits exposing sulfide mineralization associated with chlorite schist in the north half of lot 7, concession II, Bowman Township may be made via a gravel road from Matheson. The remaining distance must be traversed by foot through openly wooded but rugged terrain. The approximate location of the pits is indicated by Leahy (1965) and Jensen (1985).

Exploration History

1915: Free gold is reported to have been discovered in the south half of lots 6 and 7, concession 2, Bowman Township (The Northern Miner, December 11, 1915). 1947: Three holes were diamond drilled beneath a surface occurrence of chalcopyrite hosted by porphyry. 1956-1958: Sylvanite Gold Mines Ltd.- trenching, sampling, DD-3-711 ft. 1966: Devil's Elbow Mines Ltd.- EM, magnetometer surveys, DD-4-1504 ft., assays. 1970: E. Foster- trenching. 1973-1975: Driftex Ltd.- EM, Mag, HLEM surveys, mapping. 1981: Prospection Ltd.- ground magnetomer, HLEM, VLF-EM, DD-1-388 ft. 1986: Placer Development Ltd. - mapping, sampling, ground geophysics (magnetics, EM, HLEM).

Assessment Work on File

Geology

Province: Superior

Subprovince: Abitibi

Terrane: Wawa-Abitibi

Belt: Abitibi

Geological Age: Archean  

Geology Comments

Dec 15, 2015 (D Guidon) - Geological mapping indicates that bedrock in the area consists mainly of weakly metamorphosed (greenschist or lower metamorphic facies) intermediate to mafic subaqueously deposited tholeiitic volcanic rocks and minor intercalated interflow tuffaceous and/or sedimentary rocks of the (Archean) Kinojevis Group. Local bedrock stratigraphy is east southeast striking, steeply dipping, south facing, and occupies part of the north limb of the east striking and east plunging Blake River Synclinorium. Intrusive rocks near the sulfide occurrence include a felsic granodioritic batholith (the northern contact of which is about 1.2 km southwest of the trenches) and ubiquitous narrow (generally tens of metres in width) north northeast striking diabase dikes of the (Proterozoic) Matachewan swarm, which intrude both Kinojevis Group rocks and the felsic batholith. A recent geophysical survey of Bowman Township failed to detect any significant bedrock conductors to occur in the area of known sulfide mineralization.

Lithology

Lithology Comments

Dec 15, 2015 (D Guidon) - Mineralization exposed in a shallow trench blasted into bedrock near the north edge of an outcrop mass in the north half of lot 7, concession 2, Bowman Township consists of variably sheared pyritic and pyrrhotitic(?) chlorite-amphibole-carbonate schist. The 2 m wide rusty weathering schist strikes 100, dips irregularly north at an average angle of about 55 º. Angular, brecciated pyrrhotite(?) and fine grained disseminated to 2 cm size idioblastic pyrite cubes occur within the chlorite-carbonate schist and within an undulose, marginal, and less intensely sheared 25-35 cm wide zone of Fe-dolomitized leucoxenitic basalt (to the north) and wacke (to the south). The presence of cherty and clastic detrital sedimentary horizons within the schist indicates that the shear was developed within an interflow sedimentary and/or tuffaceous sedimentary horizon, with only minor shearing developed in marginal (now leucoxenitic) basalt. Shearing resulted in recrystallization of the sulfide component, with later hydrothermal fluids causing carbonatization (as Fe-dolomite and calcite).

Dec 15, 2015 (A Wilson) - ) A 6.9 foot long trench chip sample is reported to have averaged 1.8% copper, another chip sample is reported to have averaged 0.6% copper along 5.6 feet and additional (grab?) samples assaying as much as 11.42% copper, 6.21% lead, 4.31% zinc and 0.6 ounce of silver per ton are reported. One drill hole is reported to have intersected material which averaged 0.5% copper along a 4 foot core length.

Mineralization

Mineralization Comments

Dec 15, 2015 (D Guidon) - Information in the assessment files, indicates that in the southeast quarter of the north half of lot 7, concession 2, Bowman Township, a series of pits exposes splashes of massive chalcopyrite hosted by a conformable horizon of grey feldspar porphyry. Geological mapping by Driftex Ltd. indicates that the porphyry is mappable along 1,800 feet of strike, that it ranges from 20-100 feet in thickness, and that it is a conformable tuffaceous horizon which strikes 105º and dips 80º north (contrary to well established regional trends as delineated by Leahy and Jensen. Sulfide mineralization is described to consist of disseminated chalcopyrite splashes and sphalerite in the feldspar tuff; of stringers and disseminations of chalcopyrite, sphalerite and galena along bedding planes and confined to fractures within thinly bedded tuff near the southern tuff contact; and of as much as 25% of nodular pyrite in tuff. This drilling is reported to have intersected a 10 and 2 foot core length each of which averaged 0.5% copper, with additional associated anomalously elevated lead, zinc and silver values. A 2 foot section of the 10 foot core section is reported to have averaged 1.17 oz./t Au.

Dec 15, 2015 (A Wilson) - Samples collected in 1986 by Placer Development returned values up to 2270 ppb Au in a quartz vein.

Mineral Record Details

References

File - Resident Geologist files KL-2273, KL-2307, KL-2604

Publication Number: Date:

Author:

Publisher Name:

Location: Kirkland Lake RGP office

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

Publication Number: OFR5735 Page: 60-70  Date: 1990

Author: Bath A.C.

Publisher Name: Ontario Geological Survey

Location:

MonoMap - Geology of Currie and Bowman townships, District of Cochrane

Publication Number: R040 Page: 18  Date: 1997

Author: Leahy E.J.

Publisher Name: Ontario Dept. of Mines

Location:

Folio - Bowman Township, District of Cochrane

Publication Number: GDIF271 Date: 1997

Author: Kirkland Lake RGO

Publisher Name: Ontario Geological Survey

Location: Kirkland Lake RGP office

Mono - Copper, nickel, lead and zinc deposits of Ontario

Publication Number: MDC012 Page: 131  Date: 1969

Author: Shklanka R.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Precambrian Geology of the Highway 101 Area, East of Matheson, Ontario

Publication Number: M2676 Scale: 1:50,000    Date: 2003

Author: Berger B.R., Luinstra B., Ropchan J.C.

Publisher Name: Ontario Geological Survey

Location:

Map - Geological Compilation of the Lake Abitibi Area, Abitibi Greenstone Belt

Publication Number: P3398 Scale: 1:100,000    Date: 1999

Author: Ayer J.A., Berger B.R., Trowell N.F.

Publisher Name: Ontario Geological Survey

Location:

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