Ontario Geological Survey
Permanent Link to this Record:
MDI53C13SE00071
| Record Name(s) | Arrowsmith No.2 - 1979 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1979-Apr-20 |
| Date Last Modified | 2022-Jun-29 |
| Created By | |
| Revised By |
Primary Commodities: Lead
Secondary Commodities: Zinc
Township or Area: Setting Net Lake Area
Latitude: 52° 51' 43.23" Longitude: -93° 39' 57.7"
UTM Zone: 15 Easting: 455160.56 Northing: 5857127.95 UTM Datum: NAD83
Resident Geologist District: Red Lake
NTS Grid: 53C13SE
Point Location Description: Precise
Location Method: Conversion from MDI
The exploration history of the area is summarized by Walford and Cullen (2006).
Province: Superior
Subprovince: Berens River
Terrane: North Caribou
Domain: North Caribou Core
Belt: Favourable Lake
Geological Age: Neoarchean
| Rock Type | Rank | Composition | Texture | Relationship | Vein | 1 | Quartz | Host |
|---|---|---|---|---|
| Sandstone | 2 | Greywacke | Contains | |
| Granitoid-Unsubdivided | 3 | Near | ||
| Mafic lava flow-unsubdivided | 4 | Near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Galena | Economic | Ore | ||||
| 10 | Pyrite | Economic | Ore | ||||
| 15 | Pyrrhotite | Economic | Ore | ||||
| 20 | Sphalerite | Economic | Ore |
Oct 22, 2007 (Mark Puumala) - The Arrowsmith No. 2 occurrence is described by Ayres (1974) as a sphalerite-galena-pyrite-quartz vein hosted in greywacke. The occurrence is exposed in a pit blasted into the side of an outcrop. Ayres indicates that the host rock is a north-trending unit of quartz-poor greywacke that strikes north. These metasedimentary rocks are bounded to the southwest by mafic metavolcanics, and to the west by porphyritic biotite granodiorite of the Setting Net Lake batholith. To the east, the greywacke is separated from the main metasedimentary formation by a quartz monzonite sill. Ayres indicates that the mineralized quartz vein exposed in the pit strikes north, dips steeply, is 60 to 90 cm wide, and consists of glassy, fine-grained bluish quartz. Mineralization is reported to consist of up to 5% disseminated and narrowly-veined pyrite, up to 3% shalerite occurring as veinlets or blebs, minor sphalerite in narrow veinlets and rare disseminated pyrrhotite. The metasedimentary host rocks are also reported to contain up to 20% disseminated medium- to coarse-grained pyrite. Numerous other generally north-trending quartz veins averaging 30 cm in width are also reported by Ayres (1974) to occur throughout the greywacke horizon. The veins make up approximately 15% of this unit and also cross-cut the adjacent granodiorite. Two distinct sets of veins are reported to occur, including relatively wide (up to 30 cm) veins similar to that exposed in the pit, and later, narrower (just a few cm wide) white quartz veins. Both vein sets are reported by Ayres (1974) to be mineralized with up to 5% pyrite. Disseminated pyrite is also found in the greywacke immediately adjacent to the veins. Ayres (1974) reported assay values of up to 1% Pb and 0.3% Zn in grab samples collected from the galena and sphalerite-bearing vein. No significant assays were reported from grab samples collected from the other quartz veins hosted within the greywacke.
| Rank | Classification |
|---|---|
| 1 | Vein (Polymetallic) |
| Rank | Characteristic |
|---|---|
| 1 | Vein |
File - Resident Geologist files AF RL 1981 53C/NW/13 #38
Publication Number: Date: 1996
Author:
Publisher Name:
Location: Red Lake RGP
MonoMap - Geology of the Trout Lakes area, District of Kenora (Patricia Portion)
Publication Number: R113 Page: 152-153 Date: 1974
Author: Ayres L.D.
Publisher Name: Ontario Division of Mines
Location:
Book - Technical Report on MERC Minerals Inc.`s Borthwick Lake Property.
Publication Number: RL5053 Date:
Author: Walford, P. and Cullen, D. 2006.
Publisher Name:
Location: Red Lake RGP
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