Ontario Geological Survey
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MDI42E11NE00004
| Record Name(s) | Bankfield Mine - 1934 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Past Producing Mine Without Reserves or Resources |
| Date Created | 1980-Feb-13 |
| Date Last Modified | 2022-May-09 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Secondary Commodities: Silver
Township or Area: Errington, Lindsley
Latitude: 49° 41' 49.6" Longitude: -87° 4' 51.07"
UTM Zone: 16 Easting: 494169.19 Northing: 5504958.13 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42E11NE
Point Location Description: Minesite - shaft.
Location Method: Data Compilation
Access Description: The claim block is primarily in western Errington Township, immediately north of Trans Canada Highway 11. The past-producer is located 8.25 km west of the turn-off to Geraldton (Highway 584) along Trans Canada Highway 11 and is within 250 m of the road.
1931: Staked by T.A. Johnson and Robert Wells. 1933-34: Diamond-drilling done by the Sudbury Diamond Drilling Company. 1934: All interests transferred to Bankfield Gold Mines, which completed 2254.9 m of diamond-drilling. A three compartment vertical shaft sunk to a depth of 48.2 m with one level established at 45.7 m. 1936: Bankfield Gold Mines Ltd. changed their name to Bankfield Consolidated Mines Ltd. Construction began on a 125 ton per day mill. Underground dev't continued. 1937: Plant electrified; mill completed and put into operation. Underground dev't continued. Surface buildings erected. 1939: 59 holes drilled underground (2082.4 m total); production continued. 1940: 3092.2 m of underground diamond-drilling, in addition to drifting, crosscutting and raising. 1942: Operations suspended in August due to exhaustion of ore reserves. 1963-64: Geophysical surveys conducted by Bankfield Consolidated Mines Ltd. 1979: All lands were returned to the crown. 1981: Roxmark Mines Ltd. filed application to the crown to purchase Bankfield property slimes and tailings. 1983: Bruce Durham of Middleton Exploration mapped the Bankfield Mine property. 1984: Field Resources Ltd. carried out an IP survey. Approx. 609.6 m drilled south of Hwy 11 on VLF and mag anomalies by owners Field Resources. 1990: Roxmark Mines Ltd. acquired interest in the property and conducted a tailings prefeasibility study. This indicated a resource of 421,631 tons averaging 0.044 opt gold (Can. Mines Handbook, 1990-91). 2007: Premier Gold began signing various agreements to gain interest in the property and began exploration drilling. 2016: Greenstone Gold carried out an IP survey.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 63.4763 | 42E11NE0003 | 42E11NE0003 |
| 63.6072 | 42E10NW0113 | 42E10NW0113 |
| 63.4717 | 42E11NE0004 | 42E11NE0004 |
| 2.57054 | 20000013872 | 20000013872 |
Province: Superior
Subprovince: Wabigoon
Belt: Beardmore-Geraldton
Geological Age: Archean
Dec 07, 2005 (G White) - The Bankfield Mine property is located in the east central portion of the main Beardmore-Geraldton Metasedimentary- Metavolcanic Belt. The property lies along the western extention of the Bankfield-Tombill fault, a prominent structural feature controlling much of the mineralization ( and past production) in this portion of the belt. Roxmark Mines Limited indicates that the Bankfield property is known to host the down-plunge extensions of the Magnet Mine footwall and Benedict zones lying immediately to the east (Can. Mines Handbook, 2000-01).
Dec 07, 2005 (B Nelson) - The oldest rocks in the vicinity of the mine are clastic sediments consisting essentially of alternating beds of medium-grained, massive greywacke and fine-grained, slaty greywacke. Overlying those to the north are conglomerate, greywacke, black slate and iron formation. Intrusive rocks include diorite, quartz albite porphyry and diabase which cuts all other rock formations as a very prominent dyke. Just north of the main ore zone there is a strong fault zone that strikes across the property N70W and dips steeply 70 degrees SW. This break, referred to as the Bankfield-Tombill or the No. 1 fault, is an outstanding structural feature that has been traced for several miles across the district. The main ore zone at the mine consists of a buff-colored, fragmental zone and, locally, a band of partially silicified greywacke included between the porphyry-diorite complex and the relatively unaltered sediments to the north. This zone has an average thickness of about 7 feet, but pinches and swells, varying in width from as little as 1 foot to as much as 20 feet. Adjacent to and partly within the silicified breccia zone, three ore shoots have been developed and mined. They were characterized by the occurrence of much visible gold, somewhat erratically distributed, mainly along small fractures but also along well-defined and persistent shear planes. The heaviest gold mineralization was in partially silicified greywacke along the hanging wall or south side of the breccia zone. On the 950 foot and 1025 foot levels, a small amount of good ore was mined from a body 40 to 60 feet north of the porphyry-diorite mass. This ore body consisted of brecciated and silicified greywacke. About 2300 feet NE of the main ore zone is the North Zone, determined by diamond-drilling and one outcrop on a small island in Magnet Lake. It consists of silicified and carbonatized greywackes, mineralized with small amounts of pyrite and arsenopyrite.
| Rock Type | Rank | Composition | Texture | Relationship | Sandstone | 1 | Greywacke | Sheared & Brecciated | Host |
|---|---|---|---|---|
| Granitoid-Unsubdivided | 2 | Host | ||
| Diabase | 3 | Diabase | Near | |
| Siltstone | 4 | Near | ||
| Gabbro | 5 | Gabbro | Near | |
| Ironstone-unsubdivided | 6 | Near | ||
| Conglomerate | 7 | Near | ||
| Quartz Porphyry | 8 | Quartz-Albite | Kink-Folded | Host |
| Diorite | 9 | Diorite | Near | |
| Mudstone | 10 | Slate | Host | |
| Vein | 11 | Quartz | Host |
Dec 07, 2005 (B Nelson) - South of the shaft, albite porphyry intrudes the gabbro and the sedimentary rocks, mainly wacke and iron formation. The albite porphyry contains angular clasts of gabbro possessing rotated foliation, oblique to the prominent fabric in the porphyry. Therefore, some deformation took place after gabbro intrusion but prior to the introduction of the albite porphyry. All surface and underground mapping suggests the gold mineralization post-dates the porphyry.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Gold | Economic | Ore | ||||
| 2 | Pyrite | Economic | Ore | ||||
| 3 | Arsenopyrite | Economic | Ore | ||||
| 4 | Pyrrhotite | Economic | Ore | ||||
| 5 | Chalcopyrite | Economic | Ore | ||||
| 6 | Sphalerite | Economic | Ore | ||||
| 7 | Galena | Economic | Ore | ||||
| Chlorite | Alteration | Chloritic | 1 | Unknown | Disseminated | ||
| Sericite | Alteration | Sericitization | 2 | Unknown | Disseminated | ||
| Carbonate | Alteration | Carbonatization | 3 | Unknown | Disseminated | ||
| Quartz | Alteration | Silicification | 4 | Unknown | Disseminated | ||
| Albite | Alteration | Albitization | 5 | Unknown | Disseminated |
Dec 07, 2005 (B Nelson) - Production: SEE PRODUCTION file. Mill clean-up took place from 1944-47. An additional 425 oz of Au and 149 oz of Ag were produced at this time. Total production amounted to 66, 416 oz Au and 7, 590 oz Ag milled from 229,009 tons (1937 to 1947).
Oct 25, 2018 (Therese Pettigrew) - Assays taken from the tailings in 1990 returned values of 1.29-2.90 gpt Au, 6.33-6.4% Fe, and 2.26-2.28% S (AFRI 42E10NW0113).
Dec 07, 2005 (B Nelson) - Farther from the ore zone is a general chloritization of the wall rocks with a subordinate sericitization where these rocks have been highly sheared. As the ore zone is approached, carbonatization overshadows the chloritization, but gradually gives way to silicification and subordinate albitization within the ore zone itself.
Date: Dec 19, 1996
Geologist: B Nelson
Notes: The Beardmore-Geraldton Economic Geologist visited this property in June, 1981, June 23, 1984, June 13, 1985 and August 29, 1985.
| Year | Tonnes | Commodities | Reference | Comment |
|---|---|---|---|---|
| 1947 | 209568 |
Silver 7590 Ounces Gold 66416 Ounces |
OFR 5630 | Last year of Production: 1947. Mine operation: 1937-1947. Total Production (tons milled)= 231,009 (209,568 tonnes). Au = 66,416 oz @ 0.29 oz/t. Ag = 7,590 oz |
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:
Thesis - Geology of Bankfield Vicinity, Little Longlac Area
Publication Number: PhD Thesis Date: 1943
Author: Hoiles, R.G.
Publisher Name: University of Arizona
Location: Thunder Bay RGP Library
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:
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: 87-96 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
Map - Thunder Bay data series, Lindsley Township area, Thunder Bay District
Publication Number: P2519 Scale: 1:15,840 Date: 1982
Author: Love W.D.
Publisher Name: Ontario Geological Survey
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:
Part - Mines of Ontario in 1934
Publication Number: ARV44-01.003 Page: 72 Date: 1997
Author: Sinclair D.G., Keeley E.C., Cooper D.F., Weir E.B., Webster A.R.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Mines of Ontario in 1935
Publication Number: ARV45-01.003 Page: 81-82 Date: 1997
Author: Sinclair D.G., Keeley E.C., Cooper D.F., Weir E.B., Webster A.R.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Mines of Ontario in 1936
Publication Number: ARV46-01.003 Page: 100-101 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 1937
Publication Number: ARV47-01.003 Page: 88-90 Date: 1997
Author: Sinclair D.G., Tower W.O., Taylor J.B., Douglass D.P., Bayne A.S., Cave A.E., Cooper D.F., Weir E.B., Webster A.R.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Mines of Ontario in 1938
Publication Number: ARV48-01.003 Page: 77-79 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:
Part - Mines of Ontario in 1939
Publication Number: ARV49-01.003 Page: 76-78 Date: 1997
Author: Tower W.O., Cave A.E., Taylor J.B., Douglass D.P., Hargrave W.G., Bayne A.S., Cooper D.F., Weir E.B., Webster A.R.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Mines of Ontario in 1940
Publication Number: ARV50-01.001 Page: 5-6 Date: 1997
Author: Tower W.O., Cave A.E., Taylor J.B., Little E.S., Hargrave W.G., Bayne A.S., Cooper D.F., Weir E.B., Douglass D.P.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Mines of Ontario in 1942
Publication Number: ARV52-01.003 Date: 1997
Author: Tower W.O., Smith R.L., Bawden W.E., Cooper D.F., Taylor J.B., Little E.S., Weir E.B., Douglass D.P.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Statistical review of the mineral industry of Ontario for 1941
Publication Number: ARV51-01.001 Page: 69-71 Date: 1997
Author: Tremblay M.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Mines of Ontario in 1943
Publication Number: ARV53-01.003 Date: 1997
Author: Tower W.O., Smith R.L., Bawden W.E., Cooper D.F., Taylor J.B., Little E.S., Weir E.B., Douglass D.P.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Statistical review of the mineral industry of Ontario for 1944
Publication Number: ARV54-01.001 Date: 1997
Author: Tremblay M.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Statistical review of the mineral industry of Ontario for 1945
Publication Number: ARV55-01.001 Date: 1997
Author: Tremblay M.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Statistical review of the mineral industry of Ontario for 1946
Publication Number: ARV56-01.001 Date: 1997
Author: Tremblay M.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Statistical review of the mineral industry of Ontario for 1947
Publication Number: ARV57-01.001 Page: Table 5 Date: 1997
Author: Tremblay M.
Publisher Name: Ontario Dept. of Mines
Location:
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