Ontario Geological Survey
Permanent Link to this Record:
MDI52P04NE00011
| Record Name(s) | Achapi Lake - 1990, 312-001 - 1988 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1990-Nov-29 |
| Date Last Modified | 2022-Mar-02 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Achapi Lake Area
Latitude: 51° 9' 35.83" Longitude: -89° 30' 13.99"
UTM Zone: 16 Easting: 324920 Northing: 5670593 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 52P04NE
Point Location Description: DDH Database
Location Method: Data Compilation
1987-88: Geophysical surveys and diamond drilling by Dome Exploration. 2009: Jiminex Inc. contracted an airborne EM survey.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 10 | 52P03NW0010 | 52P03NW0010 |
| 52P04NE0018 | 52P04NE0014 | 52P04NE0014 |
| 2.43454 | 20000004305 | 20000004305 |
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Lake St. Joseph
Geological Age: Neoarchean
Nov 09, 2006 (Mark Puumala) - The Dome Misehkow River gold occurrences are located in a metavolcanic and metasedimentary belt described by Sage and Breaks (1982) as the Pashkokogan Lake-Misehkow River Belt. This belt is bounded to the north by Granitoid rocks of the Kagami Pluton and Seach-Achapi Lakes Granitoid Complex (Stott 1996), and to the south by the metasedimentary migmatites of the English River Subprovince. Rocks mapped in the immediate vicinity of these occurrences by Sage and Breaks (1982) include mafic metavolcanics (dominant lithology), felsic metavolcanics, clastic metasedimentary rocks and iron formation. Diamond drill hole logs compiled by Dome Exploration at the site in 1988 provide evidence of relatively complex stratigraphy and stong deformation/alteration. The following lithologies are reported to have been encountered during diamond drilling (9 holes): mafic metavolcanics, iron formation, chlorite schist, sericite schist, intermediate tuff, greywacke, rhyolite, and one narrow (1m intersection) felsic dike.Stott and Corfu (1991) have interpreted the boundary between rocks of the 2750-2730 Ma Confederation Assemblage and 2723-2713 Ma St. Joseph Assemblage to be located in close proximity to this occurrence, along an inferred contact that is approximately coincident with the course of the Misehkow River. Confederation Assemblage rocks are located to the north of the river, and are dominated by mafic metavolcanics, while the St. Joseph Assemblage rocks are located further to the south and include mafic and felsic metavolcanics and metasedimentary rocks. The Dome Misehkow River gold occurrences are located in rocks immediately adjacent to the Confederation.St. Joseph Assemblage boundary. Sage and Breaks (1982) indicate that bedding and foliation orientations in the Pashkokogan Lake-Misehkow River Belt are generally parallel. Foliation in felsic metavolcanic rocks in close proximity to the occurrence was mapped by Sage and Breaks (1982) as having an orientation of 235/86. Based on the lithological descriptions provided in the Dome Exploration diamond drill logs, and the relative locations of the occurrences, it is probable that they are associated with an east-northeast-striking structure similar to that hosting the nearby Northern Dynasty Misehkow River prospect.
| Rock Type | Rank | Composition | Texture | Relationship | Schist-Unsubdivided | 1 | Sericite Schist | Contains |
|---|---|---|---|---|
| Ironstone-unsubdivided | 2 | Near | ||
| Mafic lava flow-unsubdivided | 3 | Near | ||
| Intermediate lava flow-unsubdivided | 4 | Near | ||
| Wacke | 5 | Greywacke | Near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore | ||||
| Silica | Alteration | Silicification | 1 | Unknown | Disseminated | ||
| Sericite | Alteration | Sericitization | 2 | Unknown | Disseminated |
Nov 09, 2006 (Mark Puumala) - Anomalous gold assays were reported by Dome Exploration from samples collected from three diamond drill holes (312-001, 312-004, and 312-005). The anomalous values in drill hole 312-001 included 1.34 g/t over 0.4 m and 0.68 g/t over 0.3 m. Both anomalous assays were obtained from material logged as sericite schist. The sericite schist material is reported to be strongly foliated, contains quartz bands and stringers, and is mineralized with minor amounts of pyrite. The sericite schist occurs adjacent to material logged as chlorite schist (altered mafic metavolcanics?) and iron formation.
| Rank | Classification |
|---|---|
| 1 | Lode (Gold) |
| Rank | Characteristic |
|---|---|
| 1 | Sheared |
Map - Cat Lake-Pickle Lake, geological compilation series, Kenora and Thunder Bay districts
Publication Number: M2218 Scale: 1:253,440 Date: 1976
Author: Sage R.P., Breaks F.W., Troup W.R.
Publisher Name: Ontario Division of Mines
Location:
MonoMap - Geology of the Cat Lake-Pickle Lake area, districts of Kenora and Thunder Bay
Publication Number: R207 Scale: Date: 1982
Author: Sage R.P., Breaks F.W.
Publisher Name: Ontario Geological Survey
Location:
Mono - The Geology and Tectonic History of the Central Uchi Subprovince
Publication Number: OFR5952 Scale: Date: 1996
Author: Stott G.M.
Publisher Name: Ontario Geological Survey
Location:
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