Ontario Geological Survey
Permanent Link to this Record:
MDI42E10NE00017
| Record Name(s) | MacFarlane Longlac Occurrence - 9999, MacFarlane Long Lac - 1991 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1991-Jan-23 |
| Date Last Modified | 2022-Sep-27 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Secondary Commodities: Copper
Township or Area: McBean Lake Area
Latitude: 49° 39' 40.53" Longitude: -86° 39' 12.92"
UTM Zone: 16 Easting: 525000.287 Northing: 5501026.592 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42E10NE
Point Location Description: Shafts, diamond-drill holes.
Location Method: Conversion from MDI
Access Description: The property is located in the McBean Lake Area, on the east shore of Long Lake and opposite Birch Bay. Follow the Trans Canada Highway 11, 9.5 km east of the turn-off to Geraldton (Highway 584), and turn southeast on the Eldee Lake Road to Long Lake. From this point, the property is accessible by boat, approximately 8.5 km to the northeast on Long Lake to Birch Bay, and east to the shore of the lake.
1934: The property was first staked by W. MaFarlane and other individuals. Surface exploration was performed and a shaft sunk to 9.1 m. 1936: Further surface work performed. 1936-37: Diamond-drilling performed, and a second shaft sunk to 42.7 m (450 m east of the first shaft). Cross-cutting began in late 1937. 1938: More diamond-drilling. 1948: Claims were cancelled; property restaked. 1949: Surface expl'n conducted. 1950: Six holes totalling 1367.3 m drilled. 1951-1982: The claims were cancelled and restaked numerous times. 1984: A grid was cut and mag and EM surveys were conducted. Power stripping was performed elsewhere on the claim block. 1986: Claims held by Michael Malouf.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 11 | 42E10NW0038 | 42E10NW0038 |
Province: Superior
Geological Age: Archean
Dec 07, 2005 (B Nelson) - The MacFarlane property is on the east extension of the Geraldton Southern Metasedimentary Sub-belt. Metapelitic sediments, quartz hornblende schist and sheared conglomerate are intruded by crowded feldspar porphyries. The schist contains fine-grained bedded sulphides (less than 1%). At the east end of the trench adjacent to the shaft, there is a rusty weathering, 30 cm sulfide rich horizon (10% sulphides) within the metasediments. Sheared conglomerate containing clasts with aspect ratios up to 6:1 and a foliation subparallel to bedding was apparently the host rock for coarse visible gold mineralization. Forth metres north of the trench, garnetiferous metapelites are exposed. Typical bedding attitude is subvertical, although locally both bedding and foliation are folded about small 'Z' shaped structures which appear to plunge to the west. Foliation may be bedding parallel or slightly oblique throughout the exposure, Locally a weak lineation, produced by alignment of hornblende prisms, is oblique to both bedding and foliation, which may indicate proximity to a fold hinge, although a considerable quantity of observational data are required to confirm this. The porphyry intrusions appear relatively undeformed and unmetamorphosed. The grade of metamorphism is markedly higher than that found in the sedimentary package 8 km to the west. Deformed quartz-carbonate veins with abundant sulphides is the most prominent feature of the dump rock from the East MacFarlane shaft. It has also been noticed that vein mineralization (qtz-carb +/- tour =/- sulphides) is spatially associated with the porphyries, both at the intrusion-sediment contact and within the intrusion, where the veins are highly irregular and tourmaline rich.
| Rock Type | Rank | Composition | Texture | Relationship | Mudstone | 1 | Near |
|---|---|---|---|---|
| Schist-Unsubdivided | 2 | Quartz Hornblende | Near | |
| Feldspar Porphyry | 3 | Feldspar | Near | |
| Conglomerate | 4 | Sheared | Host | |
| Vein | 5 | Quartz-Carbonate | Host |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Arsenopyrite | Economic | Ore | ||||
| 2 | Chalcopyrite | Economic | Ore | ||||
| 3 | Gold | Economic | Ore | ||||
| 4 | Pyrite | Economic | Ore | ||||
| 5 | Pyrrhotite | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| 2 | Carbonate | Economic | Gangue | ||||
| Quartz | Alteration | Silicification | 1 | ||||
| Carbonate | Alteration | Carbonatization | 2 |
Dec 07, 2005 (B Nelson) - Deformed quartz-carbonate veins with abundant sulphides is the most prominent feature of the dump rock from the East MacFarlane shaft. It has also been noticed that vein mineralization (qtz-carb +/- tour =/- sulphides) is spatially associated with the porphyries. Po is found disseminated, in coarse clots, and as vein selvages, for a total of approximately 1-2%. Asp, cp and py are found in lesser amounts, e.g. less than 0.5% combined, and are usually confined to vein material. One core sample assay of 0.065 oz/ton Au was obtained (from qtz vein with some cp and po) in the 1950 drilling program conducted by John Pichette.
Dec 07, 2005 (B Nelson) - At the east end of the trench adjacent to the shaft, there is a rusty weathering, 30 cm sulfide-rich horizon (10% sulphides) within the metasediments. The rocks are, in places, extensively carbonatized throughout, while in others, carbonate alteration is less pervasive, present along microfractures.
Date: Jan 09, 1997
Geologist: B Nelson
Notes: The Beardmore-Geraldton Economic Geologist visited the occurrence September 26, 1985.
Map - Long Lake-Pagwachuan Lake area, District of Thunder Bay, Ontario
Publication Number: ARM46B Scale: 1:63,360 Date: 1997
Author: Fairbairn H.W., Macdonald R.D.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Tashota-Geraldton sheet, geological compilation series, Thunder Bay and Cochrane districts
Publication Number: M2102 Date: 1997
Author: Pye E.G., Harris F.R., Fenwick K.G., Baillie J.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Geology of the northern Long Lake area
Publication Number: ARV46-03.001 Date: 1997
Author: Fairbairn H.W.
Publisher Name: Ontario Dept. of Mines
Location:
Folio - McBean Lake area, District of Thunder Bay
Publication Number: GDIF047 Date: 1997
Author: Thunder Bay RGO
Publisher Name: Ontario Geological Survey
Location:
Mono - Gold occurrences, prospects, and deposits of the Beardmore-Geraldton area, districts of Thunder Bay and Cochrane
Publication Number: OFR5630 Date: 1986
Author: Mason J.K., White G.D.
Publisher Name: Ontario Geological Survey
Location:
Part - Mines of Ontario in 1936
Publication Number: ARV46-01.003 Date: 1997
Author: Sinclair D.G., Tower W.O., Bayne A.S., Cooper D.F., Weir E.B., Webster A.R.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Mines of Ontario in 1928
Publication Number: ARV38-01.003 Date: 1997
Author: Sinclair D.G., Cleland R.H., Keeley E.C., Jarrett G.S., Webster A.R.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Mines of Ontario in 1938
Publication Number: ARV48-01.003 Date: 1997
Author: Sinclair D.G., Cave A.E., Tower W.O., Taylor J.B., Douglass D.P., Bayne A.S., Cooper D.F., Weir E.B., Webster A.R.
Publisher Name: Ontario Dept. of Mines
Location:
We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.
Please review our Terms of Use agreement for this data product.
For detailed information regarding this mineral record please contact the Thunder Bay North Resident Geologist District Office