Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42E10NW00005

Record: MDI42E10NW00005

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Tungsten, Silver

Location

Township or Area: Errington, Ashmore

Latitude: 49° 41' 53.33"    Longitude: -86° 57' 28.09"

UTM Zone: 16    Easting: 503043   Northing: 5505071.01    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E10NW

Point Location Description: Minesite

Location Method: AMIS Site Visit

Access Description: The property is located in east central Errington and west central Ashmore Township. The mine is located near the south shore of Barton Bay. The past-producer is located immediately west of Highway 584, 0.6 km south of Geraldton.

Exploration History

1917: Gold was discovered in the glacial drift along the shore near the Main Narrows on Little Long Lake. 1932: Claims staked by various individuals. Sudbury Diamond Drilling Co. drilled the gold find and outlined a commercial ore shoot. 1933: Little Longlac Gold Mines Ltd. was organized to develop the mine. A 3 compartment shaft was sunk to 137.16 m, and 2 levels est. 1934: An electric powerline reached the mine and a 150 ton/day mill was built. 1935-1940: Underground dev't con't in the form of shaft sinking, drifting, winze sinking, cross-cutting, etc. Diamond-drilling was extensive. 1941: Discovery of scheelite in the ore resulted in handpicking of the tungsten rich material. 1942: Underground dev't con't. A small mill was built to treat the tungsten. 1943-1952: Underground dev't con't. Diamond-drilling was extensive. 1953: Mining operations con't until the end of the year. Salvage of equipment and mill clean-up followed. 1954-56: Limited production resulted from clean-up. 1967: Little Longlac Gold Mines Ltd. formed. They drilled 1,524 m to test the iron formation. Algoma Steel was granted a 3 year option. 1989: Roxmark Mines Ltd. secured the right to evaluate the mine tailings. 1991: Roxmark conducted sampling and analysis on tailings from 3 mines in the area including the Little Long Lac mine. 2007: Greenstone Gold acquired the property. 2016: Greenstone Gold carried out an IP survey.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Beardmore-Geraldton

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (B Nelson) - The ore bodies at the Little Longlac Mine occurred in the large Z-shaped minor fold on the north limb of the Barton syncline. The fold plunges 45 to 55 degrees to the west. Numerous smaller flexures are superimposed, some of which are incompatible structures believed to have been formed during a later period of deformation. In the underground workings, two important, and many minor, cross cutting faults have been encountered. Measurements of the intersections fo the fault and the workings indicate a strike of N17W, and a flat dip of 28 degrees to the east. Another fault encountered on the 5th and 6th levels strikes N30W, approximately at right angles to the quartz veins, and dips west at 20 degrees. The ore bodies consist of more or less parallel quartz veins and stringers within fracture zones in massive arkose. For the most part, the sulphides are confined to narrow selvages and books of altered wall rock along and within the individual veins, although small amounts are commonly enclosed by the vein quartz itself. The quartz veins have, along their walls, narrow salvages, generally less than half an inch thick, of highly sheared and sericitized arkose impregnated with small amounts of finely divided sulphides, chiefly pyrite and arsenopyrite. Except for these salvages and the ribbons and books of similar material within the larger veins, wall rock alteration is not visible, even with a microscope. Two parallel vein zones, known as the Main and the 09 Zones, have been opened up and tested. Only the former has yielded any significant quantity of ore.

Lithology

Lithology Comments

Dec 07, 2005 (B Nelson) - The property is underlain by clastic sediments including intraformational conglomerate, arkose, greywacke, slate and iron formation, all of which have been severely folded and intruded in turn by diorite, diorite porphyry, lamprophyre and quartz diabase.

Mineralization

Mineralization Comments

Dec 07, 2005 (B Nelson) - Mineralization occurs chiefly in quartz and ocnsists of small amounts of carbonate and scheelite and subordinate sulphides. The metallic constituents rarely make up more than 2 or 3% of the ore. Limonite, hematite, magnetite and ilmenite occur in small quantities in the ore, but Pye (1951) considers these, with the possible exception of the hematite, to be original constituents of the arkose rather than introductions. Tourmaline has also been noted.

Oct 16, 2019 (Therese Pettigrew) - Kailey is located at the location of former Little Long Lac Mines. The deposit at the Little Long Lac Mine occurred in the large Z-shaped minor fold on the north limb of the Barton syncline. The fold plunges 45 to 55° to the west. Numerous smaller flexures are superimposed, some of which are believed to have been formed during a later period of deformation. The deposit consists of more or less parallel quartz veins and stringers within fracture zones in massive arkose. For the most part, the sulfides are confined to narrow selvages and books of altered wall rock along and within the individual veins, although small amounts are commonly enclosed by the vein quartz itself. The quartz veins have, along their walls, narrow selvages, generally less than half an inch thick, of highly sheared and sericitized arkose impregnated with small amounts of finely divided sulfides, chiefly pyrite and arsenopyrite.

Alteration Comments

Dec 07, 2005 (B Nelson) - The quartz veins have, along their walls, narrow salvages, generally less than half an inch thick, of highly sheared and sericitized arkose impregnated with small amounts of finely divided sulphides, chiefly pyrite and arsenopyrite. Except for these salvages and the ribbons and books of similar material within the larger veins, wall rock alteration is not visible, even with a microscope.

Mineral Record Details

Site Visit Information

Date: Jan 09, 1997

Geologist: B Nelson

Notes: The Beardmore-Geraldton Economic Geologist visited the minesite in June of 1982, in July of 1983, and on July 28, 1984.

References

Journal - Geology of the Little Long Lac Mine; In: Economic Geology, vol. 32, p. 318-334

Publication Number: EconGeol32 Page: 318-334  Date: 1937

Author: Bruce, E.L., Watkin, S.

Publisher Name: Economic Geology

Location: https://doi.org/10.2113/gsecongeo.32.3.318

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:

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

Publication Number: OFR5630 Page: 329-338  Date: 1986

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

Publisher Name: Ontario Geological Survey

Location:

Journal - Gold Ores of the Little Long Lac Area, Ontario; In: Economic Geology, vol. 38, no. 3, p. 204-252

Publication Number: EconGeol38 Date: 1943

Author: Armstrong, H.S.

Publisher Name:

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:

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

Publication Number: MDC013 Page: 266  Date: 1971

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

Publisher Name: Ontario Dept. of Mines and Northern Affairs

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:

Part - Geology of Errington Township, Little Long Lac area

Publication Number: ARV60-06 Page: 84-100  Date: 1997

Author: Pye E.G.

Publisher Name: Ontario Dept. of Mines

Location:

Publication - NI 43-101 Technical Report, Hardrock Project, Ontario, Canada

Publication Number: 2016 NI 43-101 Date: 2016

Author: Gignac, L.P., Schlyeter, G., Menard, M., Sirois, R., Murahwi, C., et al.

Publisher Name: G Mining Services Inc. for Greenstone Gold Mines

Location: SEDAR under Premier Gold

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 - Mines of Ontario in 1949

Publication Number: ARV59-02 Page: 41-43  Date: 1997

Author: Williams I.

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:

Part - Mining operations in 1953

Publication Number: ARV63-02 Page: 49-50  Date: 1997

Author: Field D.J.

Publisher Name: Ontario Dept. of Mines

Location:

Part - Mines of Ontario in 1950

Publication Number: ARV60-02 Page: 40-42  Date: 1997

Author: Reade M.

Publisher Name: Ontario Dept. of Mines

Location:

Part - Little Long Lac gold area

Publication Number: ARV44-03 Page: 33-44  Date: 1997

Author: Bruce E.L.

Publisher Name: Ontario Dept. of Mines

Location:

Part - Mining operations in 1951

Publication Number: ARV61-02 Page: 40-42  Date: 1997

Author: Reade M.

Publisher Name: Ontario Dept. of Mines

Location:

Part - Mining operations in 1952

Publication Number: ARV62-02 Page: 41-44  Date: 1997

Author: Field D.J.

Publisher Name: Ontario Dept. of Mines

Location:

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