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Ministry of Energy, Northern Development and Mines
Permanent Link to this Record: MDI000000002204| Deposit Name(s) | Halverson - 1996 |
|---|---|
| Deposit Status | occurrence |
| Date Created | 2018-Mar-23 |
| Date Last Modified | 2018-Mar-23 |
| Created By | T Pettigrew |
| Revised By | T Pettigrew |
Primary Commodities: zinc
Secondary Commodities: copper
Township or Area: McCron
Latitude: 48° 41' 35.4" Longitude: -85° 29' 15.56"
UTM Zone: 16 Easting: 611293 Northing: 5394451 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42C11NW
Point Location Description: Report by OGS staff
Location Method: field visit
1996: discovered by prospector L. Halverson. No assessment reports have been found, but the site was visited by OGS RGP staff and samples taken.
Province: Superior
Subprovince: Wawa
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship |
|---|---|---|---|---|
| amphibolite | 1 | adjacent | ||
| iron formation | 2 | host | ||
| felsic intrusive | 3 | felsic dykes and sills |
03/23/2018 (T Pettigrew) - Scattered outcrops are exposed in a cut-over area immediately north of Highway 17, between the two points at which the White River intersects the highway. An east-southeast-trending powerline lies just north of the occurrence, which was discovered by prospector Lloyd Halverson. The area is underlain by an east- to southeast-striking package of ampbibolite-facies, supracrustal rocks that extend northwest towards White Lake. These massive to gneissic supracrustal rocks are in contact with granitoid rocks to the north. Several generations of felsic dykes and sills intrude the supracrustal rocks, in some cases producing a lit-par-lit appearance. The majority of the local supracrustal rocks are dark green to black, fme- to medium-grained amphibolites derived from mafic volcanic rocks. Pillowed flows have been noted in highway outcrops to the southwest. There is some sausseritization of the feldspathic component of the amphibolite. Large boulders of a variety of feldspathic and biotitic schists and gneisses are ubiquitous and likely represent metmorphosed elastic sedimentary rocks. They host some patchy epidote ±garnet± quartz alteration. Banded iron formation constitutes a minor, but conspicuous portion of the supracrustal succession. It is characterized by its rusty, weathered appearance and by centimetre-scale bands of quartz, sulphides and mafic minerals. The supracrustal rocks are intruded by massive to foliated, equigranular to variedtextured granodiorite, which is, in turn, intruded by pegmatite dykes. Paleoproterozoic diabase dykes are the youngest rocks (Schnieders and Smyk, 1966).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Habit Description |
|---|---|---|---|---|---|---|---|
| 1 | chalcopyrite | economic | ore | ||||
| 2 | pyrite | economic | ore | ||||
| 3 | pyrrhotite | economic | ore | ||||
| 1 | quartz | economic | gangue |
03/23/2018 (T Pettigrew) - Fine-grained chalcopyrite, pyrite and pyrrhotite occur throughout the iron formation as disseminated grains and along fracture surfaces. Limited outcrop exposures preclude accurate measurement of the iron formation's size. It is estimated to be approximately 1 m thick at this location. A 45 cm chip sample returned 5454 ppm Zn and 1291 ppm Cu. A similar rock, occurring as a rusty boulder near the junction of Highway 17 and the Pakoawaga Lake road (1.5 km west of the Halverson occurrence), returned 2582 ppm Zn and 830 ppm Cu. A rusty-weathering, friable, locally epidotized, biotite schist with disseminated, fine-grained pyrite returned 0.01 ounce Au per ton (Schnieders and Smyk, 1996).
Date: 1996-Jul-03
Geologist : M Smyk
Notes: Sample 96 BLH-03 was a 45 cm chip sample taken across a rusty iron formation. It returned an assay of <5 ppb Au, 1291 ppm Cu, and 5454 ppm Zn.
Publication - Schreiber-Hemlo Resident Geologist’s District - 1996, In: Report of Activities 1996, Resident Geologists, p. 4-20
Publication Number: OFR5958 Date: 1997
Author: Schnieders, B.R., and Smyk, M.C.
Publisher Name: OGS
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For detailed information regarding this mineral deposit please contact the Thunder Bay South Resident Geologist District Office