Ontario Geological Survey
Permanent Link to this Record:
MDI000000001770
| Record Name(s) | Holzem - 1987, Shaco Lake - 1986 |
|---|---|
| Related Record Type | |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 2014-Oct-15 |
| Date Last Modified | 2022-Sep-13 |
| Created By | |
| Revised By |
Primary Commodities: Amethyst
Township or Area: Titmarsh Lake Area
Latitude: 48° 15' 33.29" Longitude: -90° 32' 55.16"
UTM Zone: 15 Easting: 681935 Northing: 5348020 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52B07SE
Point Location Description: Exposed amethyst vein
Location Method: Conversion from MDI
Access Description: Access to the Holzem occurrence is obtained by travelling approximately 90 km along Highway 588 from the intersection with Highway 11-17 to where the highway reaches within 300 m of the northwest end of Shaco Lake. The occurrences can then be accessed via walking trails
1988-90: manual stripping by M. Holzem.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| W8804-00584 | 52B07SE5002 | 52B07SE5002 |
Oct 16, 2014 (Mark Puumala) - The following is excerpted from the site visit notes of Sarvas and O’Brien (1986). The bedrock underlying this property consists of coarse-grained, massive to weakly foliated granites, paragneisses and migmatites. The rocks are comprised mainly of pink to white alkali feldspar, quartz and dark green amphibole. Crystal size ranges from less than 0.3 cm up to 3.0 cm in diameter. Discontinuous gneissic and magmatic banding is commonly observed. In two locations, a number of dilation veins are observed cross-cutting the gneissic rocks. The veins display two general orientations: 60-90 degrees and 110-90 degrees. The veins are up to 0.5 metres wide; they appear to be discontinuous and of highly variable width. The veins consist mainly of white, smokey and amethystine quartz. Near the wallrock contact, numerous brecciated fragments of country rock are incorporated into the vein. Some of these fragments appear to be partly assimilated. The granitic wallrock and brecciated fragments commonly contain chloritic streaks.
| Rank | Classification |
|---|---|
| 1 | Vein |
Date: Nov 16, 1986
Geologist: M O'Brien
Notes: Perry Sarvas and Mark O’Brien visited the site. The occurrence geological description is based on this site visit.
File - Resident Geologist Mineral Deposit File 52B07SE, Holzem Occurrence
Publication Number: Date:
Author:
Publisher Name:
Location: Thunder Bay RGP office
Mono - Amethyst in the Thunder Bay Area
Publication Number: OFR5891 Date: 1994
Author: Garland M.I.
Publisher Name: Ontario Geological Survey
Location:
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