Ontario Geological Survey
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MDI32D12SW00011
| Record Name(s) | Hofmann-West - 1949, Lightval Mines Ltd. - 1986, Asbestos Corp. Ltd. - 1950, Dominion Gulf Co. - 1950, Hofmann Asbestos Deposit - 1986 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Prospect |
| Date Created | 1987-Apr-03 |
| Date Last Modified | 2022-Sep-27 |
| Created By | |
| Revised By |
Primary Commodities: Asbestos
Township or Area: Harker
Latitude: 48° 32' 7.75" Longitude: -79° 48' 38.16"
UTM Zone: 17 Easting: 587801 Northing: 5376503 UTM Datum: NAD83
Resident Geologist District: Kirkland Lake
NTS Grid: 32D12SW
Point Location Description: centre of cluster of drill holes in claims L40537 and L40538
Location Method: Data Compilation
1949: C.E. Hofmann - DD-13-2899 ft. 1950-60: property optioned to Dominion Gulf Co. and Asbestos Corporation Limited - 3 magnetometer surveys, DD-10-7051 ft. 1950-60: C.E. Hofmann - DD-4063 ft.(unknown number of drill holes).1960: mapping, DD-18-7110 ft. 1960-86: Lightval Mines Limited - airborne geophysics.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| KL-2953/2.13197 | 32D12SW0001 | 32D12SW0001 |
| KL-1155/12 | 32D12SW0121 | 32D12SW0121 |
Province: Superior
Subprovince: Abitibi
Terrane: Wawa-Abitibi
Belt: Abitibi
Tectonic Assemblage: Stoughton-Roquemaure
Geological Age: Mesoarchean
Metamorphism Grade: Greenschist
| Rock Type | Rank | Composition | Texture | Relationship | Peridotite | 1 | Peridotite | Serpentinized | Host |
|---|---|---|---|---|
| Gabbro | 2 | Gabbro | Adjacent | |
| Felsic lava flow-unsubdivided | 3 | Rhyolite | Adjacent |
Jun 25, 2015 (R Degagne) - Geological mapping of the Hofmann claims indicates that they are underlain mainly by east striking, north dipping, and north facing weakly metamorphosed (greenschist or lower metamorphic facies) metavolcanic, tuffaceous, and interflow metasedimentary rock of the (Archean) Hunter Mine and Stoughton-Roquemaure Groups. Asbestos is hosted within a peridotite sill that forms part of the Ghost Range sill. Whole rock chemical analyses of samples from the deposit indicate that the host ultramafic rocks are komatiitic and that: 1. There is close similarity between the occurrence of asbestos on the Hofmann property and asbestos on the [Canadian Johns-Manville Co. Ltd.] Munro Mine [in Munro Township] and the Garrison (Bird-Ginn) deposit in Garrison Township. In all three deposits, asbestos occurs in the basal dunite or peridotite of a large differentiated sill. 2. The Hofmann asbestos deposit is a major fibre deposit that awaits favorable economic conditions for development.'
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Asbestos | Economic | Ore | ||||
| 1 | Serpentine | Economic | Gangue | ||||
| 2 | Talc | Economic | Gangue | ||||
| Carbonate | Alteration | Carbonatization | 1 | Unknown | Network | ||
| Magnetite | Alteration | Hydrothermal | 3 | Unknown | Disseminated |
Jun 25, 2015 (R Degagne) - Chrysotile asbestos mineralization is confined to the (conformable) serpentinized basal peridotite portion of the Ghost Range Complex Commercial asbestos fibre, in places up to 1/25 inches long was outlined over a contuous east-west extent of 520 m and a 120 m width and 120 m depth.
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Tabular | 520 | 120 | 120 |
Date: Feb 16, 1997
Geologist: R Degagne
Notes: Chrysotile asbestos occurs in the basal serpentinized peridotite of an east-striking differentiated sill that forms part of the Ghost Range Sill. As a result of all drilling up to the end of 1960, commercial asbestos fibre in places up to 1-1/4 inches long was outlined over a continuous east-west extent of 520 m and a 120 m width and 120 m depth. Other asbestos-bearing intersections were also encountered. No bulk sampling has been performed but shallow pits were dug in three locations for visual inspection of general fibre characteristics. Laboratory milling of a 100-foot section of drill core by Flintkote Mines Limited in Thedford, Quebec, showed that the sample graded Type 4R on the Quebec test. Core losses in these samples were 11.6 percent. The Flintkote report stated: The ore is black and hard, but breaks quite easily in the crusher and jumbo. The fibre is vein fibre with good strength, good filterability and high crudy content. The core indicates an overall lack of short fibres. The cleaned fibres give good Bauer-McNett results and if treated with special graders would still be better. Further work performed in the 1960s by Lightval Mines Limited determined that core losses could be computer analyzed fairly accurately. The net result was that the average values of fibre were increased almost 300 percent, definitely establishing that there were two commercially viable zones. One of these extends for an east-west length of approximately 0.8 km on claims 40537, 38 and 41 (zone 'A'). A second zone more than 1 km long, joins the first zone immediately to the west and appears to be even richer (zone 'B'). The fibre (at least in Zone 'A') is not as harsh and brittle as at [the Canadian Johns- Manville Co. Ltd.] Munro [asbestos mine, in Munro Township] and is a natural grade 4'.
Part - Geology of Harker Township
Publication Number: ARV60-07 Page: 34 Date: 1997
Author: Satterly J.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Asbestos in Ontario
Publication Number: IMR001 Page: 16 Date: 1997
Author: Hewitt D.F., Satterly J.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Asbestos in Ontario
Publication Number: IMR036 Page: 60 Date: 1998
Author: Vos M.A.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
MonoMap - Geology and petrogenesis of the Archean Abitibi belt in the Kirkland Lake area, Ontario
Publication Number: MP123 Date: 1985
Author: Jensen L.S., Langford F.F.
Publisher Name: Ontario Geological Survey
Location:
Mono - Mineral occurrences, deposits, and mines of the Black River-Matheson area
Publication Number: OFR5735 Page: 690-694 Date: 1990
Author: Bath A.C.
Publisher Name: Ontario Geological Survey
Location:
Mono - Talc, magnesite and asbestos deposits in the Timmins-Kirkland Lake area, districts of Timiskaming and Cochrane
Publication Number: S028 Page: 53-56 Date: 1986
Author: Kretschmar U.H., Kretschmar D.K.
Publisher Name: Ontario Geological Survey
Location:
Map - Township of Harker, District of Cochrane, Ontario
Publication Number: M1951-04 Date: 1997
Author: Satterly J., Hogg N.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Geological series, Precambrian geology of the Ghost Range area, Lightning River area, Cochrane District
Publication Number: P2431 Scale: 1:15,840 Date: 1982
Author: Jensen L.S.
Publisher Name: Ontario Geological Survey
Location:
Map - Geological series, Precambrian geology of the Magusi River area, Cochrane and Timiskaming districts
Publication Number: P2434 Scale: 1:63,360 Date: 1982
Author: Jensen L.S.
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:
Map - Precambrian Geology of Parts of Lamplugh, Frecheville, Stoughton, Harker, Holloway and Marriott Townships, Ghost Range Area
Publication Number: P3615 Scale: 1:20,000 Date: 2010
Author: Dinel E.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Geological Synthesis of the Highway 101 Area, East of Matheson, Ontario
Publication Number: OFR6091 Date: 2003
Author: Berger B.R.
Publisher Name: Ontario Geological Survey
Location:
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