Ontario Geological Survey
Permanent Link to this Record:
MDI000000003007
| Record Name(s) | Tape Lake Pegmatite Dike 1 - 2010 |
|---|---|
| Related Record Type | |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 2022-Apr-12 |
| Date Last Modified | 2022-Apr-12 |
| Created By | |
| Revised By |
Primary Commodities: Lithium
Township or Area: Junior Lake Area
Latitude: 50° 28' 4.15" Longitude: -87° 57' 6.84"
UTM Zone: 16 Easting: 432445 Northing: 5591080 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42L05NW
Point Location Description: Dike 1 on map in Assessment report 20000006844
Location Method: Based on Assessment
2010: Landore Resources discovered the showing and carried out prospecting and sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.49306 | 20000006844 | 20000006844 |
| Rock Type | Rank | Composition | Texture | Relationship | Pegmatite | 1 | Host |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Contains |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Apatite | Economic | Ore | ||||
| 2 | Spodumene | Economic | Ore | ||||
| 3 | Columbite | Economic | Ore | ||||
| 4 | Cleavelandite | Economic | Ore | ||||
| 5 | Amblygonite | Economic | Ore | ||||
| 6 | Tourmaline | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| 2 | Feldspar | Economic | Gangue | ||||
| 3 | Muscovite | Economic | Gangue |
Apr 12, 2022 (Therese Pettigrew) - Dike 1 is approximately 5-8 m in width and striking east-west. It outcrops at the base of a steeply dipping elongate ridge of altered amphibolite altered mafic volcanic rocks. The dike dimensions are well constrained but it was difficult to determine the exact nature of the contacts. These dikes are composed of very coarse grained and pegmatitic quartz (40%) plagioclase feldspar (albite-microcline; 45%; locally trace to 1% orthoclase also observed) and thick books of muscovite (1-5 cm; 15%). These three mineral phases are relatively homogenously distributed throughout the entirety of the dike and vary little compositionally. Heterogeneously distrusted accessory minerals do not exceed 5% throughout but can be found locally up to 15% in small patches or clusters. These minerals include but are not limited to: fluoroapatite, spodumene, columbite-tantatlite, cleavelandite, amblygonite, and tourmaline. Fluoroapatite forms small (1-5 mm) rounded light bluish-green crystals disseminated locally up to 2%. Spodumene forms elongate whitish-yellow crystals which distinct form (2-4cm; max 10%, average trace to 1%). Spodumene was observed in dike 2 up to 30% locally. Columbite-tantalite forms black stubby crystals generally with well defined habit up to 3cm in size though generally forming small crystals locally disseminated throughout. Distribution of columbite-tantalite is highly irregular and locally only forms less than 2%. Cleavlandite forms with albite and quartz as irregular clusters and small masses up to 3cm but not more than 5% locally. Amblygonite form small grayish white massive disseminated grains forming interstitially to feldspar and quartz. Tourmaline, variety schorl, forms the most abundant accessory mineral locally up to 15%. It forms shiny black triangular prismatic crystals which are locally isolated as well as forming bands and patches of cumulates. Locally, less than 1% overall is a yellowish-brown interstitial weakly altered mineral, possibly triphylotie. Another possible mineral occurrence is audularia, which is pinkish brown and forms intestinally to orthoclase feldspar. Results from grab samples retruend values up to 0.275% Li2O (Assessment report 20000006844).
| Commodity | Analytical Method | Digestion Method | Result | Unit | Limit | Qualifier |
|---|---|---|---|---|---|---|
| Lithium | ICP-MS | 1740 | ppm | 10 |
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For detailed information regarding this mineral record please contact the Thunder Bay North Resident Geologist District Office