Ontario Geological Survey
Permanent Link to this Record:
MDI52L01SW00003
| Record Name(s) | Forgotten Lake West - 1991 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Prospect |
| Date Created | 1991-Jan-23 |
| Date Last Modified | 2022-Jul-26 |
| Created By | |
| Revised By |
Primary Commodities: Granite
Township or Area: Forgotten Lake Area
Latitude: 50° 4' .02" Longitude: -94° 21' .76"
UTM Zone: 15 Easting: 403369.739 Northing: 5546916.885 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52L01SW
Point Location Description: Outcrop
Location Method: Conversion from MDI
Access Description: FROM KENORA TAKE HWY.658 TO REDDITT.TAKE THE ENGLISH RIVER RD. FOR 11 KM NORTH.THE SITE IS TO THE EAST OF THE ENGLISH RIVER RD. ON BOTH THE EAST AND WEST SHORES OF FORGOTTEN LAKE.
1985: L.P. Nault staked the area and transferred the claims the P. Nault. 1986: P. Nault conducted diamond drilling on the property. 1987: C.B. Nelson staked a series of claims to the east of the Nault claim block. 1988: Nelson conducted a geological evaluation, power stripping and test block removal. The blocks were cut and finished to conduct market studies. Beneficiation tests on the granite included the use of water-jet cutting to evaluate the potential for using this technology to produce a new finish on the stone. 1994: C.B. Nelson still holds claims in the area.
Province: Superior
Subprovince: Winnipeg River
Terrane: Winnipeg River
Geological Age: Archean Geochronological Age: 2.66 TO 2.71 GA
Dec 07, 2005 (W Bellinger) - Beakhouse (1991) describes the geology of the area: the central part of the western Superior Province. The Subprovince is flanked to the south by a granite-greenstone domain (western Wabigoon Subprovince) and to the north by a metasedimentary migmatite domain (English River Subprovince) and a greenstone domain (Bird River Subprovince). Granodioritic to granitic plutons, the granitic suite, and minor dioritic to granodioritic plutons, the mafic suite, were emplaced between 2.66 and 2.71 Ga. The granitic suite is interpreted to have originated by the partial melting of the older metatonalites in tectonically thickened crust. Beakhouse (1991) goes on to describe the Lount Lake Batholith: The various phases of the Lount Lake batholith are typical of the granitic suite. The most abundant rock type is medium-grained granodiorite commonly characterized by large (less than 10 cm in diameter; usually approximately 1 to 3 cm in their longest dimension), subhedral to euhedral, perthitic microcline megacrysts. On the basis of their textures, composition and phase equilibria considerations, these megacrysts have been interpreted to be late magmatic megacrysts rather than true phenocrysts or porphyroblasts (Beakhouse 1983). Biotite is the ubiquitous and dominant mafic phase. Subordinate hornblende occurs very locally in close proximity to amphibolitic enclaves and is interpreted to be xenocrystic. Common primary accessory phases include magnetite, epidote, sphene, zircon and apatite. Secondary alteration products include white mica, epidote and carbonate (after plagioclase), and chlorite and magnetite (after biotite).
| Rock Type | Rank | Composition | Texture | Relationship | Granitoid-Unsubdivided | 1 | Granite, Granodiorite | Porphyritic | Host |
|---|
Dec 07, 2005 (W Bellinger) - Beakhouse (1991) goes on to describe the Lount Lake Batholith: The various phases of the Lount Lake batholith are typical of the granitic suite. The most abundant rock type is medium-grained granodiorite commonly characterized by large (less than 10 cm in diameter; usually approximately 1 to 3 cm in their longest dimension), subhedral to euhedral, perthitic microcline megacrysts. On the basis of their textures, composition and phase equilibria considerations, these megacrysts have been interpreted to be late magmatic megacrysts rather than true phenocrysts or porphyroblasts (Beakhouse 1983). Biotite is the ubiquitous and dominant mafic phase. Subordinate hornblende occurs very locally in close proximity to amphibolitic enclaves and is interpreted to be xenocrystic. Common primary accessory phases include magnetite, epidote, sphene, zircon and apatite. Secondary alteration products include white mica, epidote and carbonate (after plagioclase), and chlorite and magnetite (after biotite). COLOUR: The stone is a yellow or beige granite although Storey (1986) reported that portions of the site have a purple-coloured stone (see Photo 3, Appendix A).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Plagioclase | Economic | Ore | ||||
| 2 | Quartz | Economic | Ore | ||||
| 3 | Microcline | Economic | Ore | ||||
| 1 | Biotite | Economic | Gangue | ||||
| Biotite | Alteration | Biotitic | 1 | ||||
| Epidote | Alteration | Saussuritization | 2 | Weak | Replacement | ||
| Chlorite | Alteration | Saussuritization | 3 | Weak | Replacement | ||
| Sericite | Alteration | Saussuritization | 4 | Weak | Replacement |
Dec 07, 2005 (W Bellinger) - The various phases of the Lount Lake batholith are typical of the granitic suite. The most abundant rock type is medium-grained granodiorite commonly characterized by large (less than 10 cm in diameter; usually approximately 1 to 3 cm in their longest dimension), subhedral to euhedral, perthitic microcline megacrysts. On the basis of their textures, composition and phase equilibria considerations, these megacrysts have been interpreted to be late magmatic megacrysts rather than true phenocrysts orporphyroblasts (Beakhouse 1983). Biotite is the ubiquitous and dominant mafic phase. Subordinate hornblende occurs very locally in close proximity to amphibolitic enclaves and is interpreted to be xenocrystic. Common primary accessory phases include magnetite, epidote, sphene, zircon and apatite. Secondary alteration products include white mica, epidote and carbonate(after plagioclase), and chlorite and magnetite (after biotite).Kennedy and Sherlock (1989) described the mineralogy:The stone is a medium- to coarse-grained, porphyritic granite composed of yellow, potassic feldspar phenocrysts in a matrix of plagioclase, potassic feldspar, quartz and biotite. CHEMICAL ANALYSIS: 87MCK-0001 73.31 SiO2, 14.90 Al2O3, 3.48 Fe2O3, 0.05 MnO, 0.44 MgO, 1.87 CaO, 3.27 Na2O, 4.90 K2O, 0.63 TiO2, 0.2887 P2O5; 87MCK-0001D 70.30 SiO2, 14.75 Al2O3, 3.41 Fe2O3, 0.05 MnO, 0.51 MgO, 1.85 CaO, 3.43 Na2O, 4.93 K2O, 0.62 TiO2, 0.26 P2O5. Analyses by Geoscience Laboratories, Ontario Geological Survey, Toronto.
Dec 07, 2005 (W Bellinger) - Secondary alteration products include white mica, epidote and carbonate (after plagioclase), and chlorite and magnetite (after biotite). Secondary alteration products include white mica, epidote and carbonate (after plagioclase), and chlorite and magnetite (after biotite).
Map - Minaki to Sidney Lake, District of Kenora, Ontario
Publication Number: ARM39G Scale: 1:190,080 Date: 1997
Author: Derry D.R.
Publisher Name: Ontario Dept. of Mines
Location:
MonoMap - Preliminary geological synthesis of the English River Subprovince, northwestern Ontario and its bearing upon mineral exploration
Publication Number: MP072 Page: 29-31 Date: 1978
Author: Breaks F.W., Bond W.D., Stone D.
Publisher Name: Ontario Geological Survey
Location:
Map - Kenora-Fort Frances, geological compilation series, Kenora and Rainy River districts
Publication Number: M2443 Scale: 1:253,440 Date: 1981
Author: Blackburn C.E., Beard R.C., Rivett A.S.
Publisher Name: Ontario Geological Survey
Location:
Mono - Building and ornamental stone inventory in the districts of Kenora and Rainy River
Publication Number: MDC027 Page: 35 Date: 1986
Author: Storey C.C.
Publisher Name: Ontario Geological Survey
Location:
Article - Northwestern Region Industrial Minerals Program - 1987
Publication Number: MP138.007 Date: 1997
Author: Kennedy M.C., Sherlock E.J.
Publisher Name: Ontario Geological Survey
Location:
Map - Geological series, Operation Kenora-Sydney Lake, Kenora-Minaki sheet, District of Kenora
Publication Number: P1030 Scale: 1:63,360 Date: 1975
Author: Breaks F.W., Bond W.D., McWilliams G.H., Gower C.F., Stone D.
Publisher Name: Ontario Division of Mines
Location:
Mono - Dimensional Stone Occurrences and Deposits in Northwest Ontario
Publication Number: OFR5890 Date: 1994
Author: Hinz P., Landry R.M., Gerow M.C.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Geology of the western Birch Lake area, Kenora District, Patricia Portion
Publication Number: OFR5700 Date: 1989
Author: Beakhouse G.P.
Publisher Name: Ontario Geological Survey
Location:
File - Industrial minerals geologist files
Publication Number: IMF Date: 1996
Author: Industrial Minerals Geologist
Publisher Name:
Location: Thunder Bay RGP
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