Ontario Geological Survey
Permanent Link to this Record:
MDI42E10NW00010
| Record Name(s) | Consolidated Mosher Long Lac - 1954, MacLeod Cockshutt - 1967, Consolidated Long Lac - 1954, MacLeod Mosher - 1967, MacLeod Longlac - 1967, Mosher - 1934, Consolidated Mosher Mines - 1954, Hardrock Project - 2011 |
|---|---|
| Related Record Type | Compound |
| Related Record(s) | |
| Record Status | Past Producing Mine With Reserves or Resources |
| Date Created | 1984-Oct-12 |
| Date Last Modified | 2022-Jun-21 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Secondary Commodities: Silver
Township or Area: Errington
Latitude: 49° 40' 48.86" Longitude: -86° 57' 45.51"
UTM Zone: 16 Easting: 502695 Northing: 5503080 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42E10NW
Point Location Description: Mine shaft cap
Location Method: Data Compilation
Access Description: The property is located in southeastern Errington Township, approximately 4.5 km south of Geraldton. The mine is easily accessible by Trans-Canada Highway 11 which passes immediately to the south, 1.5 km west of the turn-off to Geraldton (highway 584).
1931: Staked by a number of prospectors. 1932: Surface work performed on the claims. 1934: Mosher Longlac Gold Mines Ltd. incorporated to develop the 22 claims. Claims were surveyed and a total of 10 668 m of trenching and 717.2 m of diamond-drilling were completed. 1936: Further prospecting, surface development and diamond-drilling. 1937: Drilling program suspended after 8 230 m. 1945-49: Talmora Longlac Gold Mines Ltd. extended a drive from its underground workings onto one of the claims and did some exploration work. 1950: Name change to New Mosher Longlac Mines Ltd. 1952: Work began on a three compartment vertical shaft. Attained depth of 365.8 m (with 2 levels and 2 sub-levels established) by the end of the year. 1953-1965: Underground development continued (including extensive diamond-drilling, shaft sinking, etc.) 1954: Name change to Consolidated Mosher Mines Ltd. 1966: Downward extensions of the ore zones were not thought to contain profitable ore and the decision was made to put the mine on a salvage basis in the new year. 1967: Newly amalgamated MacLeod Mosher Gold Mines Ltd. treated 170 555 tons of tailings to demonstrate feasibility of gold recovery. 1968: Lake Shore Mines Ltd took over all assests of MacLeod Mosher. 1966-July 1970: Underground dev't con't. until July, when operations ceased, terminating a three year salvage period. 1986: Claims held by Lakeshore Mines. Property inactive. 2008: Premier Gold acquired Lac Minerals properties. 2009: Premier drilled a 346 DDH, totalling 91,802 m. 2 areas were stripped, washed and sampled. 2010: three areas were stripped and washed, two were sampled. A regional prospecting program was conducted during the summer. Various regions of the property yielded gold values of trace amounts to 3 g/t Au. A large drill program was completed with 279 DDH totalling 114,611 m drilled. A 43-101 resource estimate was published. 2011: drilling continued with 204 DDH totalling 107, 413 m. An updated 43-101 mineral resource estimate was published. Premier Gold acquired Goldstone Resources, which gave Premier 100% interest in the Hardrock Project. 2012: Premier drilled 125 DDH totalling 68,549 m. An updated 43-101 mineral resource was published. 2013-14: Premier Gold Mines drilled 135 DDH totalling 57,675 m and carried out an IP and magnetometer survey. 2014-15: Premier carried out trenching and drilled 122 DDH totalling 40,975.9 m. 2016: Greenstone Gold Mines GP Inc. conducted IP and mag surveys. All reserve and resource information for the Greenstone Hardrock Project is contained in MDI42E10NW00008. All exploration and development information after 2019 is contained in MDI42E10NW00008.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 63.3863 | 42E10NW0178 | 42E10NW0178 |
| 2.55107 | 20000014777 | 20000014777 |
| 2.54370 | 20000013488 | 20000013488 |
| 2.57225 | 20000014180 | 20000014180 |
| 2.56635 | 20000014179 | 20000014179 |
| 2.55252 | 20000009271 | 20000009271 |
| 2.56745 | 20000014178 | 20000014178 |
| 2.57054 | 20000013872 | 20000013872 |
Province: Superior
Subprovince: Wabigoon
Belt: Beardmore-Geraldton
Geological Age: Archean
Dec 07, 2005 (B Nelson) - The property is underlain by clastic metasediments, intruded by hornblende diorite, albite porphyry and quartz diabase. The most important structural feature on the property is the Bankfield-Tombill Fault zone. Movements along the fault are thought to be multiple, the last movement resulting in the lateral displacement of the quartz diabase dykes by 670.6 m to the west. Mineralization occurs adjacent to feldspar porphyry located in a synclinorium plunging 20 to 25 degrees in a westerly direction. The ore represents the western extension of the 'F' zone exploited at the MacLeod-Cockshutt Mine. The ore-bearing sections contain both pyrite and arsenopyrite but it seems to be the latter that influences the grade. Ore sections that contain little quartz are always observed to be well mineralized with arsenopyrite, which occurs in the familiar needle-like form. There may be two ages of this mineral since it is observed in a fine, crushed condition in low grade sections along with the needle types. Free gold was seen in several quartz veins and was noted to have a tendency to occupy fractures within the quartz. Other minerals noted include chalcopyrite, tetrahedrite and black chlorite.
Aug 11, 2014 (Therese Pettigrew) - The local geological setting of the Hardrock deposit is represented by the southern sedimentary unit of the Beardmore-Geraldton Belt. The southern sedimentary unit in the Geraldton area is characterized by multiple horizons of magnetite-rich chert banded iron formation within a thick sequence of interlayered sandstone-argillite and minor polymictic conglomerate. The sequence is intruded by medium- to coarse-grained diorite sills and feldspar-quartz porphyry dykes, which, together with the sedimentary rocks are folded by tight to isoclinal, regional F2 folds. Most mineralized occurrences in the Hardrock deposit area lie in a zone of deformation to the immediate north of, and genetically linked to, the Tombill-Bankfield Deformation Zone. Gold deposits in the Hardrock deposit area are examples of epigenetic non-stratiform banded iron-formation-hosted gold deposits (Brousseau et al., 2013).
| Rock Type | Rank | Composition | Texture | Relationship | Sandstone | 1 | Wacke | Host |
|---|---|---|---|---|
| Vein | 2 | Quartz | Host | |
| Feldspar Porphyry | 3 | Feldspar | Host | |
| Diorite | 4 | Hornblende Diorite | Near | |
| Ironstone-unsubdivided | 5 | Host |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Arsenopyrite | Economic | Ore | ||||
| 2 | Pyrite | Economic | Ore | ||||
| 3 | Tetrahedrite | Economic | Ore | ||||
| 4 | Gold | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| Quartz | Alteration | Silicification | 1 | Unknown | Disseminated |
Dec 07, 2005 (B Nelson) - Free gold was seen in several quartz veins and was noted to have a tendency to occupy fractures within the quartz. Other minerals noted include chalcopyrite, tetrahedrite and black chlorite.
Aug 11, 2014 (Therese Pettigrew) - Gold mineralization generally occurs in association with subvertical structures associated with quartz veins or stringers, minor to semi-massive sulphides (associated with replacement zones in BIF), weak to moderate carbonate and weak to strong sericite alteration. The or zones rake shallowly towards the west in the vicinity of the Hard Rock, MacLeod-Cockshutt and Mosher Mines (15-30° W) and slightly more steeply towards the west at the Little Long Lac Mine (50-60° W), indicative of a strong structural control that post-dates the tight folding of the primary units. There is also local control as a result of lithological controls, with gold-bearing zones preferentially forming where subvertical structures have crossed favourable environments, including the BIF and areas around the contact of the Hard Rock Porphyry and the sedimentary rocks it intrudes. The structurally controlled, high grade veins spatially related to the Hard Rock Porphyry are similar to quartz-carbonate-sericite veins that host gold in many gold camps in Ontario. The veins related to the Hard Rock Porphyry do not host significant tonnages of ore from past production, despite their locally high grades. The turbidite-associated mineralization is typically characterized by narrow, often sheeted, mm-cm scale veins with attendant by highly variable degrees of carbonate-sericite-pyrite alteration. This style of mineralization forms wide, low grade zones. The iron-formation hosted mineralization is similar to that in Archean-age gold mines elsewhere in Ontario (Musselwhite and Dona Lake Mines). This mineralization is typically in the form of sulphidized zones on a cm-m scale associated with minor quartz veins that transect iron-formation beds (Armstrong et al., 2010).
| Rank | Classification |
|---|---|
| 1 | Mesothermal |
| 1 | Vein |
Date: Dec 30, 1996
Geologist: B Nelson
Notes: The Beardmore-Geraldton Economic Geologist visited this site July 12, 1982.
| Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
|---|---|---|---|---|---|---|
| Consolidated Mosher | 1969 | Probable | 789358 | Riddell, 1971 | Gold 3.03 Grams per Tonne |
| Year | Tonnes | Commodities | Reference | Comment |
|---|---|---|---|---|
| 1970 | 208236 |
Silver 2463 Ounces Gold 27208 Ounces |
OFR 5630 | 27,208 oz Au, 2,463 oz Ag (combined MacLeod-Cockshutt and Mosher Longlac mines) |
| 1969 | 449049 |
Silver 4378 Ounces Gold 44292 Ounces |
OFR 5630 | 44,292 oz Au, 4,378 oz Ag (combined MacLeod-Cockshutt and Mosher Longlac mines) |
| 1968 | 421635 |
Silver 5025 Ounces Gold 52040 Ounces |
OFR 5630 | 52,040 oz Au, 5,025 oz Ag (combined MacLeod-Cockshutt and Mosher Longlac mines) |
| 1967 | 425990 |
Silver 5455 Ounces Gold 57034 Ounces |
OFR 5630 | 57,034 zo Au, 5,455 oz Ag (combined MacLeod-Cockshutt and Mosher Longlac mines) |
| 1966 | 485488 |
Silver 5520 Ounces Gold 52217 Ounces |
OFR 5630 | 52,217 oz Au, 5,520 oz Ag |
| 1965 | 494004 |
Silver 6326 Ounces Gold 59059 Ounces |
OFR 5630 | 59,059 oz Au, 6,326 oz Ag |
| 1964 | 549320 |
Silver 8406 Ounces Gold 75856 Ounces |
OFR 5630 | 75,856 oz Au, 8,406 oz Ag |
| 1963 | 510947 |
Silver 8155 Ounces Gold 79704 Ounces |
OFR 5630 | 79,704 oz Au, 8,155 oz Ag |
| 1962 | 420001 |
Silver 6179 Ounces Gold 63206 Ounces |
OFR 5630 | 63,206 oz Au, 6,179 oz Ag |
| 1956 | 1 |
Silver 18 Ounces Gold 223 Ounces |
ODM AR 1957, pt. 1, p. 10 | 223 oz Au, 18 oz Ag; tonnage information not available |
Map - Little Longlac Gold Area, District of Thunder Bay, Ontario
Publication Number: ARM44D Scale: 1:31,680 Date: 1935
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 Page: 268-269 Date: 1971
Author: Ferguson S.A., Groen H.A., Haynes R.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
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 occurrences, prospects, and deposits of the Beardmore-Geraldton area, districts of Thunder Bay and Cochrane
Publication Number: OFR5630 Page: 162-169 Date: 1986
Author: Mason J.K., White G.D.
Publisher Name: Ontario Geological Survey
Location:
Map - MacLeod Mosher Gold Mines Limited, surface geology, parts of Errington and Ashmore townships, District of Thunder Bay
Publication Number: P0435 Scale: 1:6,000 Date: 1997
Author: Ferguson S.A.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Geology of Errington Township, Little Long Lac area
Publication Number: ARV60-06 Page: 118-120 Date: 1997
Author: Pye E.G.
Publisher Name: Ontario Dept. of Mines
Location:
Publication - Technical Report and Mineral Resource Estimate for the Hardrock Deposit
Publication Number: 2013b NI 43-101 Date: 2013
Author: Brousseau, K., Turcotte, B., Richard, P-L., and Pelletier, C.
Publisher Name: Premier Gold Mines / InnovExplo
Location: SEDAR
File - Resident Geologist Mineral Deposit Files
Publication Number: Min Dep Date:
Author:
Publisher Name:
Location: Thunder Bay RGP
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:
Publication - Technical Report on the Updated Mineral Resource Estimate for the Hardrock Gold Property; Geraldton, Ontario, Canada
Publication Number: 2011 NI 43-101 Date: 2011
Author: Murahwi, C., Shoemaker, S., and Gowans, R.
Publisher Name: Premier Gold Mines / Micon
Location: SEDAR
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 - Little Long Lac gold area
Publication Number: ARV44-03 Date: 1997
Author: Bruce E.L.
Publisher Name: Ontario Dept. of Mines
Location:
Publication - Technical Report on the Mineral Resource Estimates for the Hardrock, Brookbank and Keylake Projects; Trans-Canada Property, Beardmore-Geraldton Area, Northern Ontario, Canada
Publication Number: 2013 NI 43-101 Date: 2013
Author: Lewis, W.J., Murahwi, C., and San Martin, I.A.J.
Publisher Name: Premier Gold Mines / Micon
Location: SEDAR
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 - Mining operations in 1952
Publication Number: ARV62-02 Page: 61-62 Date: 1997
Author: Field D.J.
Publisher Name: Ontario Dept. of Mines
Location:
Publication - NI 43-101 Technical Report Concerning: Trans-Canada Property, Hardrock and Brookbank Projects, Preliminary Economic Assessment
Publication Number: 2014 NI 43-101 Date: 2014
Author: Stantec - Mining
Publisher Name: Premier Gold Mines / Stantec
Location: SEDAR
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: 69-70 Date: 1997
Author: Field D.J.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Mining operations in 1955
Publication Number: ARV65-02 Page: 21-22 Date: 1997
Author: Field D.J.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Mining operations in 1956
Publication Number: ARV66-02 Page: 26-27 Date: 1997
Author: Field D.J.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Mining operations in 1957
Publication Number: ARV67-02 Page: 28 Date: 1997
Author: Field D.J.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Annual report of the Ontario Department of Mines for the year 1962, volume 72, statistical review of the mineral industry and mining operations for 1962
Publication Number: ARV72 Page: 22-23 Date: 1998
Author: Kelly T.J., Riddell G.S.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Annual report of the Ontario Department of Mines for the year 1963, volume 73, statistical review of the mineral industry and mining operations for 1963
Publication Number: ARV73 Page: 23-24 Date: 1998
Author: Riddell G.S.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Annual report for the year 1964, statistics of the mineral industry and mining operations in Ontario for 1964
Publication Number: ARV74 Page: 21-22 Date: 1998
Author: Riddell G.S.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Annual report for the year 1965, statistics of the mineral industry and mining operations in Ontario for 1965
Publication Number: ARV75 Page: 25-26 Date: 1997
Author: Riddell G.S.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Annual report for the year 1966, statistics of the mineral industry and mining operations in Ontario for 1966
Publication Number: ARV76 Page: 25-26 Date: 1998
Author: Riddell G.S.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Annual report on mining operations in Ontario during calendar year 1968
Publication Number: ARV78 Page: 21 Date: 1998
Author: Riddell G.S.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Mining operations in 1959
Publication Number: ARV69-02 Page: 18-19 Date: 1997
Author: Mines Inspection Branch
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Seventieth annual report of the Ontario Department of Mines, volume 70, mining operations in 1960, statistical review of the mining industry for 1960
Publication Number: ARV70 Page: 22-23 Date: 1998
Author: Kelly T.J., Riddell G.S.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Annual report of the Ontario Department of Mines for the year 1961, volume 71, statistical review of the mineral industry and mining operations for 1961
Publication Number: ARV71 Page: 25-26 Date: 1998
Author: Kelly T.J., Riddell G.S.
Publisher Name: Ontario Dept. of Mines
Location:
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