Ontario Geological Survey
Permanent Link to this Record:
MDI52J13NE00004
| Record Name(s) | McCombe - 1983, Root Lake - 1983, Root Lake Pegmatite Group - 2003 |
|---|---|
| Related Record Type | Partial |
| Related Record(s) | |
| Record Status | Developed Prospect With Reported Reserves or Resources |
| Date Created | 1983-Sep-15 |
| Date Last Modified | 2023-May-04 |
| Created By | |
| Revised By |
Primary Commodities: Lithium, Tantalum
Secondary Commodities: Tourmaline
Township or Area: Root Lake Area
Latitude: 50° 56' 14.05" Longitude: -91° 42' 31.61"
UTM Zone: 15 Easting: 590725 Northing: 5643639 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 52J13NE
Point Location Description: Pegmatite location in AFRI 20000001877
Location Method: Conversion from MDI
Access Description: The Root Lake property is accessed by dirt road from both Red Lake and Sioux Lookout. The road from Red Lake is a winter road and can be difficult to drive during the summer months if the ground is wet. Access to the property via Sioux Lookout is possible using the Vermilion River Road and the Rawhide Road, which are regularly used and maintained by Buchanan Forest Products. The Rawhide Road crosses the NE edge of the claims and is bridged over the Roadhouse River providing access to the north. The western claims can be accessed by canoe, or small boat and by foot.
1955: Capital Lithium Mines discovered the Root Lake pegmatite with 11 diamond drill holes. 1956: Capital Lithium drilled 55 DDH totalling 10,442 m and outlined 4 zones. 1997: Brancote Canada acquired the property together with a portfolio of properties from Conwest Mining Inc. 2000: Landore Resources Canada Inc. acquired Brancote Canada. 2005: Landore staked claims. Reconnaissance mapping and sampling was completed in August 2005. 2010: Landore contracted an independent technical review of the property.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| RL AF # RL5077; AFRO# 2.33959 | 20000001877 | 20000001877 |
| 52J13NE0011 | 52J13NE0006 | 52J13NE0006 |
| 52J13NE0015B1 | 52J13NE0005 | 52J13NE0005 |
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Lake St. Joseph
Geological Age: Archean
Aug 28, 2007 (Mark Puumala) - The Root Lake pegmatite group consists of 4 spodumene pegmatites within a 3 by 4 km area (Breaks et al. 2003). Two of these occurrences (McCombe and Consolidated Morrison) are hosted in mafic metavolcanic rocks of the Uchi Domain, while the other two (Capital Lithium Mines occurrences) are hosted by metasedimentary rocks of the English River Domain. McCombe prospect, which consists of two pegmatite dikes that have been traced for an east-west strike length of 550 m (Breaks et al. 2003). These pegmatites exhibit internal zoning, are highly evolved, and have been classified as complex-type, spodumene-subtype by Breaks et al. (2003). A detailed discussion of the mineralogy of these pegmatites is provided by Breaks et al. (2003). Mulligan (1965) reports that a 1956 diamond drilling program on the McCombe prospect by Capital Lithium Mines outlined a 2,333,752 tonne (2,297,000) ton deposit grading 1.3% Li2O. Breaks et al. (2003) report tantalum assays of up to 380 ppm from 24 bulk rock samples collected from across the two dikes.
| Rock Type | Rank | Composition | Texture | Relationship | Pegmatite | 1 | Host |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Adjacent |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Spodumene | Economic | Ore | ||||
| 2 | Lepidolite | Economic | Ore | ||||
| 3 | Tourmaline | Economic | Ore | ||||
| 4 | Beryl | Economic | Ore | ||||
| 5 | Holmquistite | Economic | Ore | ||||
| 6 | Petalite | Economic | Ore | ||||
| 7 | Spessartine | Economic | Ore | ||||
| 8 | Manganocolumbite | Economic | Ore |
May 27, 2015 (Therese Pettigrew) - At locality 01-FWB-41-03 (UTM 591763E, 5643280N, Zone 15), a 1 m thick tourmaline-bearing quartz-porphyritic aplite dyke was discovered about 1 km south of the McCombe pegmatite dykes. Two 3 to 4 m wide pegmatite dykes along the Root Lake road were also investigated and respective samples of tourmaline-bearing fine-grained leucogranite and biotite-muscovite potassic pegmatite were analyzed. The muscovite granite of the Root Bay pluton contains tourmaline with a composition of magnesium-rich schorl. The potassic pegmatite contains more magnesium-rich tourmaline with a composition of dravite-schorl. The presence of magnesium-rich tourmaline indicated that the Root Bay pluton is primitive because as a granitic melt crystallizes, its composition changes from magnesium-rich to iron-rich. Several internal zones were observed in the 2 pegmatites: -Tourmalinite zone (exocontact) along dyke contacts -White feldspar-rich wall zone -Tourmaline-bearing, equigranular to porphyritic potassium feldspar, sodic aplite zone -Tourmaline-bearing, porphyritic potassium feldspar spodumene pegmatite zone -Lepidolite-rich pods and seams Dyke 1 is the largest and is intermittently exposed for a strike length of 176 m and maximum width of 15 m. Dyke 2 is lens-shaped in plan and measures 19 by 87m. Highly deformed mafic metavolcanic rocks comprise the host rocks that contain local, acicular, purple/blue holmquistite (lithium amphibole) crystals formed due to Iithium-enriched fluids from the pegmatites metasomatizing the host rocks. Armenite (BaCa2AI6Si9O30•2H2O) was found in mafic metavolcanic host rocks near Dyke 1 (Breaks et al., 2003). The pegmatite, as seen in scattered exposures, is generally rather fine grained, consisting of albite feldspar, quartz, and spodumene, with scattered subhedral coarse white feldspar crystals. Spodumene occurs as random-oriented, fine white laths with dark grey quartz and scattered white feldspar crystals, in lenticular bands and patches. Lithia assays up to 1 per cent have been obtained from schist near dyke contacts. This schist contains biotite and abundant fine holmquistite, but apparently no spodumene or lepidolite (Mulligan, 1965).
| Rank | Classification |
|---|---|
| 1 | Pegmatite |
| Rank | Characteristic |
|---|---|
| 1 | Intrusive |
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Unknown | 176 | 15 |
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Lens | 87 | 19 |
| Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
|---|---|---|---|---|---|---|
| McCombe | 2023 | Inferred Mineral Resource | 4500000 | Green Technology Metals ASX release April 19, 2023 | 1.01% Li2O, with a 0.2% Li2O cut-off grade | Lithium 1.01 %, Tantalum 110 ppm |
| Root Lake | 1979 | Unclassified | 2086500 | OGS OFR 6180, Table 14 (MP 90 - Breaks 1979) | Mulligan (1965) reports that a 1956 diamond drilling program on the McCombe prospect by Capital Lithium Mines outlined a 2,333,752 tonne (2,297,000) ton deposit grading1.3% Li2O to the 150 m depth (500 foot level) | Lithium 1.3 Percent |
File - Resident Geologist files AF RL 1956 52J/NW #2
Publication Number: Date: 1996
Author:
Publisher Name:
Location: Red Lake RGP
File - Resident Geologist files AF RL 1956 52J/NW #7
Publication Number: Date: 1996
Author:
Publisher Name:
Location: Red Lake RGP
Map - Geological series, Operation Miniss-Tully lakes, Root Lake sheet, districts of Kenora and Thunder Bay
Publication Number: P2215 Scale: 1:63,360 Date: 1979
Author: Breaks F.W., Bond W.D., Stone D., Desnoyers D.W.
Publisher Name: Ontario Geological Survey
Location:
Mono - Report of Activities 1998, Resident Geologist Program, Red Lake Regional Resident Geologist Report: Red Lake and Kenora Districts
Publication Number: OFR5987 Date: 1999
Author: Blackburn C.E., Hinz P., Storey C.C., Kosloski L., Ravnaas C.
Publisher Name: Ontario Geological Survey
Location:
Publication - Geology of Canadian Lithium Deposits; Geological Survey of Canada, Economic Geology Report 21
Publication Number: Econ Geol 21 Page: 64-65 Date: 1965
Author: Mulligan, R
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/102454
Mono - Fertile Peraluminous Granites and Related Rare-Element Mineralization in Pegmatites, Superior Province, Northwest and Northeast Ontario: Operation Treasure Hunt
Publication Number: OFR6099 Date: 2003
Author: Breaks F.W., Selway J.B., Tindle A.G.
Publisher Name: Ontario Geological Survey
Location:
Map - Root Lake sheet, Kenora District
Publication Number: M2156 Scale: 1:31,680 Date: 1969
Author: Clifford P.M.
Publisher Name: Ontario Dept. of Mines
Location:
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