Ontario Geological Survey
Permanent Link to this Record:
MDI52L08SW00022
| Record Name(s) | Pegmatite #7 - 1994 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 2004-Jun-07 |
| Date Last Modified | 2023-May-15 |
| Created By | |
| Revised By |
Primary Commodities: Lithium, Tantalum, Tin, Rubidium
Secondary Commodities: Cesium
Township or Area: Treelined Lake Area
Latitude: 50° 16' 46.93" Longitude: -94° 28' 13.26"
UTM Zone: 15 Easting: 395239 Northing: 5570764.01 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52L08SW
Point Location Description: N/A
Location Method: Data Compilation
Access Description: NW of Separation Lake
1997: Champion Bear Resources Ltd. conducted prospecting and sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 52L08SW0004 | 20000004902 | 20000004902 |
| OM92-064 | 52L08SW0005 | 52L08SW0005 |
| 2.20238 | 52L08SW2008 | 52L08SW2008 |
| 52L08SW0013 | 20000005302 | 20000005302 |
| 2.17842 | 52L08SW0024 | 52L08SW0024 |
Province: Superior
Subprovince: English River
Belt: Separation Lake
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Pegmatite | 1 | Complex-Type, Petalite-Subtype | Recrystallized Petalite Megacrysts | Host |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Adjacent |
Jul 14, 2010 (C Ravnaas) - The pegmatite is hosted by mafic metavolcanics (amphibolite). Eastern Petalite Zone, plagioclase-rich border zone, quartz-rich pod, muscovite-quartz< Jul 17, 2017 (C Ravnaas) - The ore minerals are petalite, ferrotantalite, wodginite, microlite, cassiterite. The pegmatite contains abundant petalite, albite, K-feldspar, muscovite, quartz; accessory fluorapatite, beryl, tourmaline, arsenopyrite, fluorite, oxides (ferrotantalite, W-ferrowodginite, microlite, cassiterite). 0.22 wt% Ta2O5 in channel sample of albite-rich wall zone. Jul 17, 2017 (Therese Pettigrew) - The mean Ta2O5 value for Pegmatite 7 is 50.04 ppm (Tindle and Breaks, 2000). The dyke swarm collectively known as Pegmatite 7 consists of three separate dykes, two of which may be joined at depth. The two northern dykes appear lens shaped and pinch out along strike. Both are 6 to 7 metres long by 1 to 2 metres wide, dip south at 80 degrees and appear to plunge towards the west. Both are well zoned including coarse and fine grained as well as aplitic layers. They contain muscovite, biotite feldspar, quartz, tourmaline, beryl and other minerals that are as yet unidentified. Ten samples were collected from the dyke swarm. All of the ten samples contain highly elevated values for lithium, rubidium, cesium and tantalum. Rubidium is particularly high ranging from a low of 2073 ppm to a high greater than 7000 ppm (beyond the upper detection limit for this analytical method). Cesium ranges from 176 ppm to a high of 893 ppm. The latter value (sample # 104586) is accompanied by a high tantalum value of 1070 ppm (0.1 %). This sample is from the 1.5 metre wide core of the southern pegmatite dyke. Lithium values ranged from 143 to 1515 ppm (AFRI 52L08SW0024). Jul 17, 2017 (C Ravnaas) - The alteration minerals are albite in pegmatite, holmquisite in host mafic metavolcanic rocks. The alteration type is albitization of petalite, lithium metasomatism. The habit is replacement, intensity is moderate. Article - Granite-Related Mineralization in Northwestern Ontario: II. Detailed Examination of the Separation Rapids (English River) Rare-Element Pegmatite Group Publication Number:
MP163.024
Date: 1994 Author: Breaks F.W., Tindle A.G. Publisher Name: Ontario Geological Survey Location: Journal - Columbite-Tantalite Mineral Chemistry from Rare-Element Granitic Pegmatites: Separation Lakes Area, NW Ontario, Canada; Mineralogy and Petrology, vol. 70, issue 3-4, pp. 165-198 Publication Number: Min&Pet V70
Date: 2001 Author: Breaks, F.W. and Tindle, A.G. Publisher Name: Mineralogy and Petrology Location: https://www.researchgate.net/publication/42797106_Columbite-tantalite_mineral_chemistry_from_rare-element_granitic_pegmatites_Separation_Lake_area_NW_Ontario_Canada Map - Precambrian Geology, Separation Lake Greenstone Belt-West Sheet Publication Number:
P2673
Scale: 1:20,000
Date: 2008 Author: Blackburn C.E., Young J.B., Breaks F.W. Publisher Name: Ontario Geological Survey Location: Map - Precambrian Geology, Separation Lake Greenstone Belt, East Part Publication Number:
OFM0242
Scale: 1:20,000
Date: 1994 Author: Blackburn C.E., Young J.B., Searcy T.O., Donahue K. Publisher Name: Ontario Geological Survey Location: Mono - Tantalum Mineralogy of Rare-Element Granitic Pegmatites from the Separation Lake Area, Northwestern Ontario Publication Number:
OFR6022
Date: 2000 Author: Tindle A.G., Breaks F.W. Publisher Name: Ontario Geological Survey Location: We are continuously updating our assessment file / technical report information. If you notice errors in the data, please
contact us. Please review our Terms of Use agreement for this data product. For detailed information regarding this mineral record please contact the Kenora Resident Geologist
District Office
Mineralization
Rank
Mineral Name
Class
Economic Mineral Type
Alteration Mineral Type
Alteration Ranking
Alteration Intensity
Alteration Style
1 Petalite Economic Ore 2 Ferrotantalite Economic Ore 3 Wodginite Economic Ore 4 Microlite Economic Ore 5 Cassiterite Economic Ore 6 Beryl Economic Ore 7 Tourmaline Economic Ore 8 Arsenopyrite Economic Ore 9 Fluorite Economic Ore 10 Holmquistite Economic Ore 1 Feldspar Economic Gangue 2 Muscovite Economic Gangue 3 Quartz Economic Gangue 4 Apatite Economic Gangue
Mineralization Comments
Alteration Comments
Assay Samples
Commodity Analytical Method Digestion Method
Result Unit Limit Qualifier Tantalum Unknown .22 % TA2O5
Mineral Record Details
Rank Classification 1
Magmatic 1
Pegmatite
Rank
Characteristic 1
Intrusive 1
Vein Mineral Zones - Size and Shape
Shape
Length
Thickness
Depth
Strike
Dip
Plunge
Trend
Age
Reference
Regular
PRECAMBRIAN
References
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