Ontario Geological Survey
Permanent Link to this Record:
MDI000000000161
| Record Name(s) | Baroque Grid 12B - 1988 |
|---|---|
| Related Record Type | |
| Related Record(s) | |
| Record Status | Prospect |
| Date Created | 2006-Oct-11 |
| Date Last Modified | 2022-Sep-01 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Miminiska Lake Area, Nesting Lake Area
Latitude: 51° 37' 17.21" Longitude: -88° 40' 53.23"
UTM Zone: 16 Easting: 383599.997 Northing: 5720274.996 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 52P10NE, 52P10SE
Point Location Description: Location from assessment file map.
Location Method: Data Compilation
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.30150 | 20000000511 | 20000000511 |
| 2.28483 | 52P10NE2001 | 52P10NE2001 |
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Miminiska-Fort Hope
Geological Age: Neoarchean
Oct 11, 2006 (Mark Puumala) - The geology of the Miminiska Peninsula area was mapped by Wallace (1981), who identified three major supracrustal rock sequences. These include two mafic metavolcanic-dominated sequences and one metasedimentary rock-dominated sequence. The oldest of these units is interpreted to be a thick, predominantly mafic metavolcanic sequence that is found in the southern portion of the Miminiska Peninsula and the area immediately south of Miminiska Lake. These mafic metavolcanic rocks have in turn been interpreted to be overlain by a metasedimentary rock sequence that is dominated by wacke and mudstone, but also contains significant thicknesses of banded iron formation. The metasedimentary sequence is overlain to the north by a second mafic-metavolcanic rock-dominated sequence. A significant unit of felsic to intermediate pyroclastic rocks has also been mapped in the western portion of this area (southeast of Howells Lake). This unit is located immediately south of the metasedimentary sequence west of Miminiska Lake, but is enclosed within the metasedimentary rocks further to the east. This area is bounded to the northwest by felsic intrusive rocks of the Troutfly Lake Batholith. Stratigraphic units in the vicinity of Howells Lake generally strike approximately northeast, with steep, near-vertical dip. Further to the northeast, towards Keezhik Creek, stratigraphy strikes in a more easterly orientation. Wallace (1981) indicates that foliation is generally oriented sub-parallel to the primary sedimentary bedding and igneous flow contact features. Foliation and shearing are noted by Clark (2005) to be most prominent in tuffaceous mafic metavolcanic layers. Wallace (1981b) mapped a number of northeast-trending faults and lineaments in this area. More recent maps (e.g., McKay 2004) illustrate a northeast-striking fault that parallels the metavolcanic/metasedimentary rock contact in the vicinity of Howells Lake. This structure appears to be related to many of the gold and antimony/gold occurrences in this area.
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 | Contains |
|---|---|---|---|---|
| Ironstone-unsubdivided | 2 | Contains |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore | ||||
| 3 | Arsenopyrite | Economic | Ore | ||||
| 4 | Gold | Economic | Ore | ||||
| 5 | Magnetite | Economic | Ore | ||||
| Silica | Alteration | Silicification | 1 | ||||
| Chlorite | Alteration | Chloritic | 2 |
Oct 11, 2006 (Mark Puumala) - Clark (2005) reports that Baroque encountered gold mineralization in a number of diamond drill holes at this location. The occurrence is hosted within sheared and silicified mafic volcanic rocks and banded iron formation. Mineralization is described as consisting of variable amounts of disseminated pyrrhotite (up to 4%), pyrite and arsenopyrite. Chlorite and biotite alteration were also reported. The occurrence is shown to be located immediately southeast of a northeast-striking fault illustrated on the geological compilation map of McKay (2004). Notable assays from this prospect reported by Clark (2005) include: 5.64 g/t Au over 1.67 m in drill hole 87-10; 0.77 g/t Au over 0.94 m in ddh 88-01; 0.23 g/t over 5.2 m in ddh 88-02; and 0.68 g/t Au over 1.7 m in ddh 88-03.
| Rank | Classification |
|---|---|
| 1 | Lode (Gold) |
| Rank | Characteristic |
|---|---|
| 1 | Sheared |
Map - Miminiska Peninsula, Kenora and Thunder Bay districts
Publication Number: M2416 Scale: 1:31,680 Date: 1979
Author: Wallace H.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Geology of the Miminiska Lake area, districts of Kenora (Patricia Portion) and Thunder Bay
Publication Number: R214 Date: 1981
Author: Wallace H.
Publisher Name: Ontario Geological Survey
Location:
Mono - Mineral Occurrences and Prospects in the Fort Hope-Winisk Area
Publication Number: OFR5926 Date: 1995
Author: Mason J.K., White G.D.
Publisher Name: Ontario Geological Survey
Location:
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