Ontario Geological Survey
Permanent Link to this Record:
MDI42A09SW00014
| Record Name(s) | Sylvanite 3 Occurrence - 1936, W. B. Green Property - 1937, Sylvanite Gold Mines Ltd. - 1936 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1985-May-29 |
| Date Last Modified | 2023-Jan-17 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Bowman
Latitude: 48° 31' 33.89" Longitude: -80° 27' 31.77"
UTM Zone: 17 Easting: 539957 Northing: 5374916 UTM Datum: NAD83
Resident Geologist District: Kirkland Lake
NTS Grid: 42A09SW
Point Location Description: trench
Location Method: AMIS Site Visit
Access Description: Take 4th Ave. south from Matheson 0.9km to closed dump. Walk 200m to the northeast corner and pick up the skidoo trail. Walk 250m taking the left fork. Site is 50m south of the skidoo trail.
1935: W.B. Green (of Matheson) - sampling, assays 1936-1937: Sylvanite Gold Mines Ltd. examined this area, sampling, assays. 33 samples assayed by Sylvanite Gold Mines yielded gold tenors ranging from trace to 0.10 ounce of gold per ton.
Province: Superior
Subprovince: Abitibi
Terrane: Wawa-Abitibi
Belt: Abitibi
Tectonic Assemblage: Stoughton-Roquemaure
Geological Age: Mesoarchean
Metamorphism Grade: Greenschist
Dec 15, 2015 (R Degagne) - Geological mapping indicates that bedrock exposure in northern Bowman Township is scarce, with more than 95% of the area mantled by thick and locally complex glaciolacustrine deposits. Regional scale correlation with geological mapping completed elsewhere indicates that the weakly metamorphosed (greenschist or lower metamorphic facies) volcanic bedrock in northern Bowman Township is east striking, steeply dipping, is likely south facing and belongs to the (Archean) Stoughton-Roquemaure Group. Bedrock in the trenched area is about 4 km south of the interpreted location of the Porcupine-Destor Fault Zone and occupies part of the north limb of the east striking and east plunging Blake River Synclinorium.
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 | Basalt, | Aphanitic, Amydaloidal | Host |
|---|---|---|---|---|
| Porphyry-unsubdivided | 2 | Albitic Syenite | Amygdaloidal | Host |
| Quartz Diabase | 3 | Qtz Diabase | Near | |
| Vein | 4 | Quartz-Carbonate-Epidote | Contains |
Dec 15, 2015 (R Degagne) - Intrusive rocks in the area include porphyritic felsic dikes and/or irregularly shaped masses and north striking diabase dikes of the (Proterozoic) Matachewan swarm (Heaman). A recent geophysical survey of Bowman Township failed to detect any significant bedrock conductors in the trenched area. Pits and trenches in the south half of lot 4, concession 6, Bowman Township are blasted into basalt and albite syenite porphyry near a north striking quartz diabase Matachewan dike. Waste pile samples adjacent to a flooded 5x3 m trench blasted into bedrock consist of variably carbonatized and epidote altered basalt and albite syenite porphyry and rare white quartz-epidote-calcite vein material which is developed in both porphyry and basalt.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Gold | Economic | Ore | ||||
| 2 | Pyrite | Economic | Ore | ||||
| 3 | Magnetite | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| 2 | Carbonate | Economic | Gangue | ||||
| 3 | Epidote | Economic | Gangue | ||||
| 4 | Albite | Economic | Gangue | ||||
| 5 | Chlorite | Economic | Gangue | ||||
| 6 | Sericite | Economic | Gangue | ||||
| 7 | Feldspar | Economic | Gangue | ||||
| 8 | Dolomite | Economic | Gangue | ||||
| Epidote | Alteration | Saussuritization | 1 | Strong | Replacement | ||
| Chlorite | Alteration | Saussuritization | 2 | Strong | Replacement | ||
| Calcite | Alteration | Carbonatization | 3 | Strong | Veins | ||
| Sericite | Alteration | Saussuritization | 4 | Weak | Replacement | ||
| Dolomite | Alteration | Carbonatization | 5 | Unknown | Network |
Dec 15, 2015 (A Wilson) - Samples collected from the quartz vein by W.B. Green in 1935 returned values ranging from $0.35 Au to $1.40 Au. Six feet of the vein reportedly assayed $1.40 Au. Assays obtained from Sylvanite sampling in 1936 returned values ranging from trace to 0.1 oz./t Au.
Dec 15, 2015 (R Degagne) - Pits and trenches in the south half of lot 4, concession 6, Bowman Township are blasted into basalt and albite syenite porphyry near a north striking quartz diabase Matachewan dike. Waste pile samples adjacent to a flooded 5x3 m trench blasted into bedrock consist of variably carbonatized and epidote altered basalt and albite syenite porphyry and rare white quartz-epidote-calcite vein material which is developed in both porphyry and basalt. Pyrite was only rarely observed by the present writer in the waste rock samples. The best assay obtained by the present writer (sample AB-85-89a) was 510 ppb of gold from a silicified and pyritic hornblende albite porphyritic rock. The geometry of the trenched vein or vein system could not be determined due to flooding and extensive overburden cover. Analyses*: Sample AB-85-89a: 510 Au ppb, Sample AB-85-90: 100 Au ppb, Sample AB-85-92: 110 Au ppb, Sample AB-85-93: nil Au ppb, Sample AB-85-96: nil Au ppb. * All assays performed by Swastika Laboratories Ltd., Swastika.
Dec 07, 2005 (R Degagne) - Pits and trenches in the south half of lot 4, concession VI, Bowman Township are blasted into basalt and albite syenite porphyry near a north striking quartz diabase Matachewan dike. Waste pile samples adjacent to a flooded 5x3 m trench blasted into bedrock consist of variably carbonatized and epidote altered basalt and albite syenite porphyry and rare white quartz-epidote-calcite vein material which is developed in both porphyry and basalt. Samples: AB-85-90: Dump grab as for sample AB-85-89. Olive green, weakly magnetic fine grained to aphanitic basalt intruded by white feldspar phyric dike material. The hand sample consists of decimetre scale lava tubes which display chilled margins. A dirty white quartz-epidote-chlorite veinlet is localized along the chilled lava tube margin. Plagioclase microphenocrysts are sericitized. The sample is pervasively Fe-dolomitized and contains traces of pyrite within the quartz-epidote-chlorite veinlet. AB-85-96: Dump grab as for sample AB-85-90. Pervasively epidote altered greyish pink feldspar porphyry. AB-85-97: Dump grab as for sample AB-85-90. Epidote altered pink feldspar porphyry.
| Rank | Classification |
|---|---|
| 1 | Hydrothermal |
| Rank | Characteristic |
|---|---|
| 1 | Vein |
File - Resident Geologist file KL-1046
Publication Number: Date:
Author:
Publisher Name:
Location: Kirkland Lake RGP office
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:
Map - Bowman Township, District of Cochrane
Publication Number: P0205 Scale: 1:15,840 Date: 1997
Author: Leahy E.J.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Currie and Bowman townships, Cochrane District
Publication Number: M2071 Scale: 1:31,680 Date: 1997
Author: Leahy E.J.
Publisher Name: Ontario Dept. of Mines
Location:
MonoMap - Geology of Currie and Bowman townships, District of Cochrane
Publication Number: R040 Page: 17-18 Date: 1997
Author: Leahy E.J.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Geophysical/geochemical series, Matheson-Black River area, Bowman Township, airborne electromagnetic survey, total intensity magnetic survey, District of Cochrane
Publication Number: M80594 Scale: 1:20,000 Date: 1984
Author: Questor Surveys Ltd.
Publisher Name: Ontario Geological Survey
Location:
Mono - Gold deposits of Ontario, part 1, districts of Algoma, Cochrane, Kenora, Rainy River, and Thunder Bay
Publication Number: MDC013 Page: 123 Date: 1971
Author: Ferguson S.A., Groen H.A., Haynes R.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
Folio - Bowman Township, District of Cochrane
Publication Number: GDIF271 Date: 1997
Author: Kirkland Lake RGO
Publisher Name: Ontario Geological Survey
Location: Kirkland Lake RGO
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 - 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:
Mono - Mineral occurrences, deposits, and mines of the Black River-Matheson area
Publication Number: OFR5735 Page: 55-61 Date: 1990
Author: Bath A.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:
Article - Reconnaissance till sampling program, Matheson-Lake Abitibi area, District of Cochrane
Publication Number: MP141.081 Page: 472-477 Date: 1997
Author: Steele K.G.
Publisher Name: Ontario Geological Survey
Location:
Article - A gravity survey in the Iroquois Falls-Lake Abitibi area, District of Cochrane
Publication Number: MP137.074 Date: 1997
Author: Gupta V.K., Johnstone R.M.
Publisher Name: Ontario Geological Survey
Location:
Article - Quaternary geology and geochemical exploration in the Matheson area
Publication Number: MP140.294 Page: 112-123 Date: 1997
Author: McClenaghan M.B., Lavin O.P., Nichol I., Shaw J.
Publisher Name: Ontario Geological Survey
Location:
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