Ontario Geological Survey
Permanent Link to this Record:
MDI000000003093
| Record Name(s) | Northeast Dyke - 1999 |
|---|---|
| Related Record Type | |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 2022-Jul-13 |
| Date Last Modified | 2022-Jul-13 |
| Created By | |
| Revised By |
Primary Commodities: Lithium, Tantalum
Township or Area: Steele
Latitude: 49° 2' 18.27" Longitude: -79° 55' 6.16"
UTM Zone: 17 Easting: 579051 Northing: 5432289 UTM Datum: NAD83
Resident Geologist District: Kirkland Lake
NTS Grid: 32E04SW
Point Location Description: Stn-3 from Assessment report 20000006530
Location Method: Based on Assessment
1999: J. Horne carried out prospecting and sampling to the northeast of the known Case Pegmatite and discovered the NE Dyke. 2001: E. Ludwig carried out prospecting and sampling. 2014: P.M. Hermeston carried out sampling. 2017: Power Metals carried out prospecting and sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.25775 | 32E04SW2006 | 32E04SW2006 |
| 2.55141 | 20000008184 | 20000008184 |
| 35124 | 20000016979 | 20000016979 |
| 2.20118 | 32E04SW2002 | 32E04SW2002 |
| 2.47355 | 20000006530 | 20000006530 |
| Rock Type | Rank | Composition | Texture | Relationship | Pegmatite | 1 | quartz-feldspar-mica | Is |
|---|---|---|---|---|
| Wacke | 2 | biotite-garnet metasediments | Adjacent |
Jul 13, 2022 (Therese Pettigrew) - The Northeast Dyke is a pegmatite dyke hosted by fine-grained biotite-garnet metasediments. The Northeast Dyke is exposed in two areas and appear to dip shallowly and trend northeast-southwest direction. The southern exposed area is averaging 10 m wide and an estimated 75 m in length. The northern exposed area averages 20 m in width and 48 m in length (Assessment report 20000006530).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Spodumene | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| 2 | Feldspar | Economic | Gangue | ||||
| 3 | Muscovite | Economic | Gangue |
Jul 13, 2022 (Therese Pettigrew) - In October 1999, J. Horne conducted 2 days of regional prospecting to the northeast and the northwest of the known Case pegmatite dykes. A total of 15 grab samples were collected of granodiorite, metasediments and pegmatite rocks. This regional prospecting lead to the discovery of the Northeast dyke 10 m wide by 75 m along strike with very coarse-grained spodumene. Assay of in situ sample 20365 resulted in >500 ppm Li and >100 ppm Ta at 579046 E and 5432147 N (Assessment report 32E04SW2002). Sample NED-01-14 returned >10,000 ppm Li and 57.4 ppm Ta (Assessment report 20000008184). Prospecting in 2017 by Power Metals identified high-grade very coarse grained spodumene mineralization at the surface at the Northeast dyke. The mineralogy of the newly discovered spodumene mineralization on the Northeast dyke is similar to that in the Main Dyke with spodumene chip assay results ranging from 6.04% to 7.14% Li2O. The Northeast Dyke consists of white coarse-grained K-feldspar, quartz, spodumene and muscovite. The quartz core of the Northeast dyke contains up to 40% spodumene megacrysts with cross sections up to 14 cm across. The spodumene crystals ranges from 3 to 13 cm long and up to 2 to 3 cm wide. The spodumene ranges from 2-10% and locally up to 20% of the pegmatite dyke. One green spodumene crystal was 32 cm long by 2 cm wide (Assessment report 20000016979).
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For detailed information regarding this mineral record please contact the Kirkland Lake Resident Geologist District Office