Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI000000002506

Record: MDI000000002506

General

Commodities

Primary Commodities: Lithium, Beryllium, Rubidium, Tantalum

Secondary Commodities: Niobium

Location

Township or Area: Lake Jean Area

Latitude: 49° 22' 52.71"    Longitude: -87° 56' 42.69"

UTM Zone: 16    Easting: 431396   Northing: 5470275    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E05NW

Point Location Description: Camp Li point on OGS map M2056

Location Method: Data Compilation

Access Description: The Camp lithium showing occurs in metasediments, on the south shore of the small pond along the river connecting the west end of Lake Jean with Parole Lake.

Exploration History

1955: Staked by L.E. Giles and acquired by Jean Lake Lithium Mines Ltd. in October. Stripping and sampling were carried out. 2009: Rock Tech Resources acquired the property from James Bay Midarctic Developments Inc. Rock Tech carried out prospecting and sampling. 2016: Ultra Lithium carried out prospecting, mapping, stripping, and grab and channel sampling.

Assessment Work on File

Geology

Province: Superior

Subprovince: Quetico

Geological Age: Archean  

Lithology

Mineralization

Mineralization Comments

Apr 01, 2021 (Therese Pettigrew) - The Camp pegmatite strikes N.50W obliquely across the metasedirnents as a dike and, as far as can be ascertained, dips vertically. It is exposed in two outcrops over a length of 125 feet, and is 7-12 feet in thickness. Medium- to coarse-grained crystals of potash feldspar, and fine-to medium-grained prismatic crystals of spodumene, well oriented normal to the strike of the dike, occur in a matrix of very fine- to fine-grained quartz, feldspar, and muscovite. A crude mineralogical zoning is apparent. A central zone rich in spodumene is bordered on the northeast by a one-foot-wide wall zone rich in muscovite but with little or no spodumene or potash feldspar, and on the southwest by a similar zone 2-3 feet wide. These wall zones change in granularity to sugary-textured, aplitic material as the dike contacts are approached, but no distinct "chill" or border zones were noted in the surface exposures. Although the contacts with the metasediments are knife-sharp, a little wallrock alteration is evident in a few places along the contacts; within 1-2 inches of them, the metasediments have been enriched in muscovite and are speckled in appearance. The Camp pegmatite is interrupted by a large number of thin (1/8-4 inches) vein aplites. The aplites occur in three groups, each 2-2 1/2 feet wide. One group lies within the dike, 6-8 inches from the southwest contact, and is made up of five distinct aplite veins separated by intervening strips of pegmatite. These aplites split and bifurcate along their lengths, and at one point in the outcrop eleven aplitic bands can be recognized across a width of 2 feet. The second group, made up of three aplite veins, lies about 2}^ feet from the first, near the centre of the pegmatite. The third group, made up of four aplite veins, lies 1^-2 feet from the second group, close to the northeast contact of the dike. The central section of the Camp dike, in the surface exposures at least, averages 25-30 percent unaltered spodumene, indicating a lithia content of 1.5% percent or better. In a few places, close to the outer aplite zones, some spodumene crystals near oblique fractures are highly sericitized. Alteration of spodumene, however, does not appear to be quantitatively significant (Pye, 1965). Out of a total of grab 21 samples taken by Ultra Lithium in 2016, ten samples showed over 1% lithium oxide and five samples were with 2% or more lithium oxide with a maximum value of 2.73% Li2O. Anomalous values of other rare metals include: tantalum 4 to 202 parts per million (ppm), niobium 12 to 101 ppm, beryllium 55 to 286 ppm, and rubidium 161 to 1240 ppm. Channel samples returned similar values: Channel CH16-01 intersected 1.1% Li2O over 2.29 m with Be 243 to 251 parts per million (ppm), Nb 51 to 66.4 ppm, Rb 752 to 972 ppm and Ta 34.8 to 69.2 ppm; Channel CH16-02 intersected 1.07% Li2O over 1 m with Be 259 to 293 ppm, Nb 42.4 to 66 ppm, Rb 703 to 1270 ppm and Ta 27.3 to 52.7 ppm; Channel CH16-03 intersected 1.15% Li2O over 3.0 m with Be 262 to 315 ppm, Nb 49 to 62.4 ppm, Rb 535 to 1090 ppm and Ta 29.8 to 43.6 ppm. The lithium pegmatite dikes are dipping at steep angle over 76 degrees. Spodumene is the main lithium bearing mineral in these pegmatites (Assessment report 20000013552). Samples collected by Rock Tech in 2009 returned up to 1.88% Li2O, 200 ppm Be, 89 ppm Nb, 783 ppm Rb, and 66.2 ppm Ta (Assessment report 20000005862).

Mineral Record Details

References

Map - Georgia Lake area, Thunder Bay District

Publication Number: M2056 Scale: 1:63,360    Date: 1997

Author: Pye E.G.

Publisher Name: Ontario Dept. of Mines

Location:

MonoMap - Geology and lithium deposits of Georgia Lake area, District of Thunder Bay

Publication Number: R031 Page: 65  Date: 1997

Author: Pye E.G.

Publisher Name: Ontario Dept. of Mines

Location:

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For detailed information regarding this mineral record please contact the Thunder Bay North Resident Geologist District Office