Ontario Geological Survey
Permanent Link to this Record:
MDI42E10NW00020
| Record Name(s) | Lafayette Longlac Prospect - 1934, Lafayette Long Lac South - 1934, Marquette Longlac Prospect - 1944 |
|---|---|
| Related Record Type | Partial |
| Related Record(s) | |
| Record Status | Prospect |
| Date Created | 1991-Jan-11 |
| Date Last Modified | 2022-Sep-27 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Errington
Latitude: 49° 42' 45.32" Longitude: -86° 58' 35.05"
UTM Zone: 16 Easting: 501701.215 Northing: 5506676.127 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42E10NW
Point Location Description: Diamond drill holes
Location Method: Conversion from MDI
Access Description: The property is located in east central Errington Township, immediately west of Geraldton. The eastern claims of the block are situated within the town limits of Geraldton, so the block is easily accessible by all season roads.
1933: Claims covering the occurrence were staked. Surface work was performed. 1934: Additional claims staked. Various claims transferred to other parties. 1934-35: Lafayette Longlac Gold Mines Ltd. performed considerable surface work on the claim block and drilled a total of 2,133.6 m. 1936: Mag survey was conducted, after which 609.6 m of diamond-drilling was done to test the anomalous areas. 1938-43: The 15 claims were patented. 1944: Surface exploration and diamond-drilling were done by Marquette Longlac Gold Mines Ltd. 1945: Drill program was completed. A two year total of 3,230.9 m was drilled. 1947: The company was listed as inactive in the Canadian Mines Handbook (1947). 1959: The company was no longer listed in the Canadian Mines Handbook (1959). 1984: As of August, claims were still shown on the map as patented.
Province: Superior
Geological Age: Archean
Dec 07, 2005 (B Nelson) - Lavas and tuffs have been intruded by large, sill-like and irregular masses of diorite, and one north-south dyke of quartz diabase. Most of the lavas have been highly sheared, and any original structures have, to a large extent, been obliterated. Vestiges of amygdaloidal and pillow structures are locally evident. Narrow beds of iron formation and greywacke, interbanded with the lavas, have been noted in cores from several diamond-drill holes. A belt of sediments occurs south of the diorite-greenstone complex. This belt consists largely of medium-grained arkosic greywackes intercalated with narrow beds of slaty greywacke and iron formation. Conglomerate has not been observed at the base of this series on either of these claims. The most important mineralized section occurs in an east-west zone, 121.9 m in length, which cuts andesite and diorite. The zone is 2.4 m in width, shows some silicification, and contains a considerable amount of fine-grained pyrite with a little chalcopyrite. Quartz veins up to 2.5 cm in width cut through the shear zone; and in one of these, which is 3 mm in thickness and cuts transversely through the shear zone, gold occurs in visible quantities in several places. To the west of this occurrence, massive diorite contains irregular quartz lenses, which are cut transversely by veins containing calcite and ankerite. The second and third zones occur in shear zones cutting pillowed lava and an arkosic phase of the conglomerate horizon, respectively. Scattered sulphides were noted.
| Rock Type | Rank | Composition | Texture | Relationship | Diorite | 1 | Diorite | Host |
|---|---|---|---|---|
| Quartz Diabase | 2 | Quartz Diabase | Near | |
| Intermediate lava flow-unsubdivided | 3 | Andesite | Sheared, Some Pillows | Host |
| Intermediate pillowed flow | 4 | Dacite | Pillows | Near |
| Ironstone-unsubdivided | 5 | Near | ||
| Sandstone | 6 | Greywacke | Near | |
| Vein | 7 | Quartz | Host |
Dec 07, 2005 (B Nelson) - The lavas, although highly altered, are believed to be mainly of andesitic to basaltic character. A large portion of the diorite exposed on the Marquette claims is a fine-to-medium grained variety, not unlike some andesites in appearance. Many outcrops, however, consist of coarse-grained diorite with large, well developed block crystals of hornblende.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcopyrite | Economic | Ore | ||||
| 2 | Gold | Economic | Ore | ||||
| 3 | Pyrite | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| Quartz | Alteration | Silicification | 1 |
Dec 07, 2005 (B Nelson) - Two diamond-drill holes, collared 24 m apart, intersected the most significant gold mineralization in the main zone. A sample from hole #1 assayed 1.95 oz/ton Au over 1.3 m and a sample from hole #2 assayed 9.57 oz/ton Au over 1.4 m. Veins in the second zone have yielded samples assaying from 0.01 to 0.09 oz/ton Au. Diamond-drill holes in the third zone have provided assays including 0.69 oz/ton Au (hole 15+), 0.08 oz/ton Au (hole 16+), and 0.40 oz/ton Au (hole 18+).
File - Resident Geologist files AFRO 1935-46, Errington Township
Publication Number: Date:
Author:
Publisher Name:
Location: Thunder Bay RGP
Map - Little Long Lac gold area, District of Thunder Bay, Ontario
Publication Number: ARM44D Scale: 1:31,680 Date: 1997
Author: Bruce E.L.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Compilation series, Geraldton sheet, Thunder Bay and Cochrane districts
Publication Number: P0241 Scale: 1:126,720 Date: 1984
Author: Stott G.M., McConnell C.D., Mason J.K.
Publisher Name: Ontario Geological Survey
Location:
Map - Township of Errington, District of Thunder Bay, Ontario
Publication Number: M1951-07 Scale: 1:12,000 Date: 1997
Author: Horwood H.C., Pye E.G.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Geology of Errington Township, Little Long Lac area
Publication Number: ARV60-06 Date: 1997
Author: Pye E.G.
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:
Map - Thunder Bay data series, Geraldton area, Thunder Bay District
Publication Number: P2520 Scale: 1:15,840 Date: 1982
Author: Love W.D.
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:
File - Resident Geologist Mineral Deposit Files
Publication Number: Min Dep Date:
Author:
Publisher Name:
Location: Thunder Bay RGP
Part - Little Long Lac gold area
Publication Number: ARV44-03 Date: 1997
Author: Bruce E.L.
Publisher Name: Ontario Dept. of Mines
Location:
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