Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42E10NW00004

Record: MDI42E10NW00004

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Copper, Tungsten, Tin, Antimony, Silver

Location

Township or Area: Errington

Latitude: 49° 41' 25.54"    Longitude: -86° 59' 1.6"

UTM Zone: 16    Easting: 501170   Northing: 5504212    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E10NW

Point Location Description: AMIS 02985 Shaft 3 location

Location Method: Data Compilation

Access Description: The property is located in eastern Errington Township, immediately north and northwest of Mosher Lake. The property is accessible by water (Kenogamisis Lake) from the town of Geraldton.

Exploration History

1912: Claims staked by John McKechnie. 1913-33: Limited work performed; additional claims staked. 1934: Surface exploration program was carried out by Longlac Lagoon Gold Mines Ltd. 1935: Trenching, miscellaneous surface work, and 6553.2 m of diamond-drilling were done by Oro Plata Mining Co. (the parent company of Longlac Lagoon). 1938: The mine began operations under the control of the Newmont Mining Corporation through its subsidiary, the Northern Empire Mines Co. Ltd. A 3 compartment vertical shaft was sunk to a depth of 165.8 m. Underground dev't began with levels at 59.4 m, 96.0 m and 157.0 m on which 1461.8 m of drifting and 316.4 m of crosscutting. A number of buildings were constructed. All work was done by Elmos Gold Mines Ltd. 1939: Underground dev't con't. Ore was hoisted, but none was milled. Operations suspended in Oct. due to lack of funds. 1940: Tombill Gold Mines Ltd. acquired the assets of Elmos Gold Mines Ltd. No work was performed. 1941: Trenching and stripping were performed by Tombill. 1942: 50 ton per day mill installed. Underground dev't con't. Operations suspended in November due to wartime conditions. 1947: Shaft was dewatered and underground dev't con't with 506.9 m of drifting and 204.2 m of crosscutting by Talmora Longlac Gold Mines. The Elmos mill was reconditioned and operated until the end of the year. Diamond drilling comprised 4 surface holes totalling 42.4 m and 91 underground holes totalling 3284.5 m. 1948: Operations suspended in April when no new ore was discovered. 1974: Tombill conducted VLF, mag, geological and geochemical surveys over the property. 1979: Airborne mag and EM surveys were conducted by Tombill. 1982: Tombill drilled 15 holes totalling 894.28 m and conducted VLF-EM and magnetometer surveys.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Beardmore-Geraldton

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (B Nelson) - The Talmora property is underlain by a west-plunging mass of diorite, intrusive into Timiskaming sediments. The sediments, mainly greywacke with several prominent bands of iron formation, flank this body on its north, west and south sides. Intrusive rocks, other than diorite, are quartz albite porphyry and quartz diabase. The diorite occurs as a large, saddle-like mass in the apex of the Talmora anticline. The mass plunges westward with the sediments, but at a somewhat flatter angle. The quartz-albite porphyry is, in a few places, highly sheared, and the sheared phases, not unlike quartzite in appearance, are from light grey to greenish rocks with a characteristic waxy or resinous lustre. Vertically dipping diabase dykes, trending N-S, transect all other consolidated rocks in the area. A small amount of feldspar porphyry has been noted on the 96.01 m level in contact with greywacke and diorite. Sheared conglomerate is interbedded with greywacke in one place on the 96.01 m level. Irregular fractures and shear zones, containing quartz veins and stringers of limited lateral and vertical extent, occur in both the greywacke and the diorite. The veins pinch and swell in short distances, and although widths of two feet or more are common, they average less than 1 foot in thickness. The shearing in the diorite is more prominent than in the greywacke, and the mineralized zones commonly consist of 1 leader vein, up to 3 feet in width, paralleled on either side by narrower stringers. The veins in the greywacke follow both shear and bedding planes, with the result that they are generally highly irregular and commonly contorted. The gold bearing veins and lenses are made up of 2 generations of quartz: 1) an early, fractured, white to grey, coarse-grainied variety, which makes up the bulk of the ore; and 2) a later, fine-grained variety which occurs in transverse fractures in the earlier quartz.

Lithology

Lithology Comments

Dec 07, 2005 (B Nelson) - The greywackes are greyish, thick-bedded, and fine-to-medium-grained; some are decidedly massive, others distinctly slaty in character. For the most part, the diorite is a dark green medium-grained variety. In many places, however, it grades to a coarse-grained gabbroic type with well-defined, block crystals of hornblende. The porphyry is from a pale to dark grey, massive, fine-grained rock with phenocrysts of quartz, and either white or pink feldspar.

Mineralization

Mineralization Comments

Dec 07, 2005 (B Nelson) - Quartz veins and lenses form an irregular zone, which in a general way appears to follow, as a saddle-like structure, the diorite-greywacke contact. The narrow widths and low grade of the veins and stringers in this zone do not permit profitable recovery. Tombill Mines Ltd. encountered values in drill core (1982) including 0.119 oz/ton Au over 0.31 m; 1.67 oz/ton Au over 0.08 m; 0.06 oz/ton Au over 1.37 m.

Alteration Comments

Dec 07, 2005 (B Nelson) - Both the greywacke and the diorite are bleached and altered close to the zones of mineralization. Intense sericitization of the greywacke colors the rock pale greenish for a few inches from the quartz veins. The most prevalent type of alteration in the diorite appears to be carbonatization, and in many places the diorite is separated from the quartz of the veins by narrow selvages made up almost entirely of ankeritic dolomite. It is noteworth that the sulphide and gold mineralization are more or less confined to the narrow, intensely altered zones along the walls of the veins.

Mineral Record Details

Site Visit Information

Date: Jan 28, 1997

Geologist: B Nelson

Notes: The Beardmore-Geraldton Economic Geologist visited the minesite in July of 1982.

References

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 - Mineral deposits series, Ontario mineral potential, Longlac sheet, districts of Thunder Bay and Cochrane

Publication Number: P1527 Scale: 1:250,000    Date: 1978

Author: Springer J.S.

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:

Mono - Gold occurrences, prospects, and deposits of the Beardmore-Geraldton area, districts of Thunder Bay and Cochrane

Publication Number: OFR5630 Page: 553-560  Date: 1986

Author: Mason J.K., White G.D.

Publisher Name: Ontario Geological Survey

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:

File - Resident Geologist Mineral Deposit Files

Publication Number: Min Dep Date:

Author:

Publisher Name:

Location: Thunder Bay RGP

Thesis - Gold Ores of the Little Long Lac Area

Publication Number: PhD Thesis Date: 1944

Author: Armstrong, H.S.

Publisher Name: University of Chicago

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:

Mono - Gold deposits of Ontario, part 1, districts of Algoma, Cochrane, Kenora, Rainy River, and Thunder Bay

Publication Number: MDC013 Date: 1971

Author: Ferguson S.A., Groen H.A., Haynes R.

Publisher Name: Ontario Dept. of Mines and Northern Affairs

Location:

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For detailed information regarding this mineral record please contact the Thunder Bay North Resident Geologist District Office