Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52F15SE00052

Record: MDI52F15SE00052

General

Commodities

Primary Commodities: Tantalum

Secondary Commodities: Lithium

Location

Township or Area: Brownridge

Latitude: 49° 48' 48.34"    Longitude: -92° 38' 6.53"

UTM Zone: 15    Easting: 526249   Northing: 5517951    UTM Datum: NAD83

Resident Geologist District: Kenora

NTS Grid: 52F15SE

Point Location Description: Pegmatite 16 location from NI 43-101 p. 44

Location Method: Conversion from MDI

Access Description: The Mavis Lake property is approx. 19 km NE by road from Dryden and can be reached from the city by driving east for approx. 8 km on Trans-Canada Highway 17 to the junction with Thunder Lake Road, then travelling approx. 3 km to the intersection of Thunder Lake Road and Ghost Lake South Road. From this point, drive north on Ghost Lake South Road for approx. 1 km and then east along the Mine Road for approx. 4 km, and finally north along a subsidiary gravel road to the eastern claims of the property.

Exploration History

1956: Lun-Echo Gold Mines Ltd. drilled 50 DDH totalling 2234.19 m immediately south of Mavis Lake. Milestone Mines conducted trenching work and limited DD east and southeast of Mavis Lake. 1978: R.J. Fairservice staked the property and then optioned the property to Selco Mining Corp Ltd. 1979-81: Selco conducted geological mapping, lithogeochemical surveys and drilled 8 DDH totalling 351.4 m. 1982: Tantalum Mining Corp of Canada Ltd (Tanco) optioned the Fairservice property and conducted line cutting, a geophysical survey and a lithogeochemical survey. 2002: Emerald Field Resources optioned the property from R.F. Fairservice. 2003: Emerald Field conducted prospecting, trenching, geological mapping, and drilled 4 DDH. 2009: TNR Gold and International Lithium Corp. (ILC) staked the property. ILC conducted geological mapping and sampling. 2011: ILC drilled 20 DDH totalling 1753 m.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Geological Age: Archean  

Geology Comments

May 26, 2015 (Therese Pettigrew) - The property lies within the Sioux Lookout Domain (SLD) in the western Wabigoon Subprovince (WS). The SLD is sandwiched between the granitoid-dominated Winnipeg River Subprovince (WRS) to the north and the greenstone-granite-rich WS to the south. The WS is a granite-greenstone terrain approx. 900 km long, 150 km wide that comprises metavolcanic and subordinate metasedimentary rocks ranging in age from 3.0 Ga to 2.71 Ga and intruded by a suite of 3.0 to 2.69 Ga granitoid batholiths, gabbroic sills and stocks. The 10 by 30 km area within the eastern SLD which is host to numerous rare metal pegmatites in the Dryden area is known as the Dryden Pegmatite Field (DPF), which is populated by two distinct pegmatite clusters occurring roughly 10 km apart: 1) Mavis Lake Pegmatite group (MPG) in the Mavis Lake area, with a 2665+/- 10 Ma age, and 2) Gullwing-Tot Pegmatite group (GPG) in the Gullwing and Tot Lakes areas of unknown mineralization age (Clark et al., 2010).

Lithology

Lithology Comments

Apr 28, 2017 (Therese Pettigrew) - Numerous granitic pegmatite dikes, ranging from the primary spodumene-bearing to albite-rich, tantalum-enriched varieties occur on the property. The dikes are generally found within the mafic metavolcanic sequences. These pegmatites are linked to Ghost Lake batholith, and a part of the Mavis Lake Pegmatite Group. The Mavis Lake Pegmatite Group is characterized by east-trending concentration of rare elements-bearing pegmatites and related metasomatic zones. Eleven rare metal pegmatites of this group occur on the Mavis-property, denoted as Pegmatites 11 through 19. MD52F15SE0052 is Pegmatites 13,14,16 and 16. Intense tourmaline replacement of underlying massive mafic metavolcanics is especially conspicuous near the northwestern end of Pegmatite 16. Scheelite was identified by ultraviolet examination in vein system underlying Pegmatite 16 and in similar veins between Pegmatites 13 and 14, near the main dykes of the East Zone. In the case of Pegmatite 16, it is clear that the tungsten mineralization is genetically associated at least with the tourmaline-rich veins occurring with spodumene bearing rare element pegmatites of the East Zone.

Mineralization

Mineralization Comments

Apr 28, 2017 (Therese Pettigrew) - Tantalum oxide (Ta2O5) results yielded by some of the samples of Pegmatites 14, 16are 1246 ppm (0.12 wt.%), 1349 ppm (0.14 wt.%) respectively. Samples from this area returned peak Ta2O5 values of 1349 ppm and 1246 ppm from the Pegmatites 16 and 14, respectively. Samples of Pegmatite 14 returned 19.8 ppm Cs and 9.96 ppm Rb. Samples from Pegmarite 16 returned0.014 Wt% Li. (from Technical Report (NI 43-101) On The Mavis Lake Lithium Property prepared from International Lithium Corp on Feb 5 2010. Numerous granitic pegmatite dikes, ranging from the primary spodumene-bearing to albite-rich, tantalum-enriched varieties occur on the property. The dikes are generally found within the mafic metavolcanic sequences. These pegmatites are linked to the Ghost Lake batholith (GLB), and a part of the Mavis Lake Pegmatite Group (MPG). The MPG is characterized by east-trending concentration of rare elements-bearing pegmatites and related metasomatic zones. These pegmatites fall into two zones according to the initial classification of Breaks (1989), based upon systematic variation in rare-element mineralogy and petrochemistry: 1) Spodumene-beryl-tantalite zone (Li-Rb-Be-Ta>Nb-B) and 2) Albite-type pegmatite zone (Li>Rb-Be-Ta>Nb and Rb>Li-Be-Ta>Nb). These pegmatites represent a mix of albite-spodumene-type, albite-type and complex-type pegmatite dykes. The albite-type pegmatite zone, which is the most distal part of the MPG, is composed of Pegmatites 13, 14, 15, 16 and 19. These pegmatites form thin (<1 m) sheets rich in albite and contain sporadic fine-grained aggregates of green muscovite and albite (secondary replacement after spodumene), tantalite, white beryl, and rare green lithium tourmaline and amblygonite-montebrasite series minerals. Pegmatites 13, 14 and 15, which occur within the former East Zone of Selco, consist mainly of shallowly dipping, thin sheets and one possibly interconnecting dyke. In Pegmatite 14 pervasive albitization has resulted in spodumene completely replaced by a fine-grained, green mica+albite assemblage. The pegmatitic sheets in some cases occur as a linear series of ovoid erosional remnants, which can be intermittently traced for up to 320 m. These sheets strike parallel to the host rock but their shallow southeast dips are discordant to the generally steep northwest dips (68-78 degrees) of the metavolcanic sequence. Individual sheets vary significantly in dip values, as exemplified by Pegmatite 16. At the southwest end steep southeast dips between (65-76 degrees) are evident, compared to 38 degrees at the northeast end. Pegmatite 14 is typical of the intensely albitized sheets and only ten percent of the dyke contains recognizable spodumene relics. Most of Pegmatite 14 consists of 20-25 percent fine-grained white smoky quartz embedded in a mass of white-pink albite. Beryl occurs sporadically in Pegmatites 13, 14 and 15 as subhedral white to bluish-white crystals embedded with quartz and albite. Intense tourmaline replacement of underlying massive mafic metavolcanics is especially conspicuous near the northwestern end of Pegmatite 16. Scheelite was identified by ultraviolet examination in vein system underlying Pegmatite 16 and in similar veins between Pegmatites 13 and 14, near the main dykes of the East Zone. In the case of Pegmatite 16, it is clear that the tungsten mineralization is genetically associated at least with the tourmaline-rich veins occurring with spodumene bearing rare element pegmatites of the East Zone (Clark et al., 2010).

Mineral Record Details

References

Publication - Technical Report (NI 43-101) on the Mavis Lake Lithium Property

Publication Number: 2010 43-101 Date: 2010

Author: Clark, G., Breaks, F.W., and Osmani, I.A.

Publisher Name: International Lithium Corporation

Location: SEDAR (under TNR Gold)

Map - Precambrian Geology of the Thunder Lake Area

Publication Number: P3529 Scale: 1:20,000    Date: 2003

Author: Beakhouse G.P., Pigeon L.

Publisher Name: Ontario Geological Survey

Location:

Map - Kenora-Fort Frances sheet, geological compilation series, Kenora, Rainy River districts

Publication Number: M2115 Scale: 1:253,440    Date: 1967

Author: Davies J.C., Pryslak A.P.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Precambrian geology, Flambeau Lake-Larson Bay area, western part, District of Kenora

Publication Number: P3111 Scale: 1:4,800    Date: 1988

Author: Parker J.R., Schienbein R.

Publisher Name: Ontario Geological Survey

Location:

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For detailed information regarding this mineral record please contact the Kenora Resident Geologist District Office