Ontario Geological Survey
Permanent Link to this Record:
MDI41I05NW00019
| Record Name(s) | Big Swan Project - 1995, O'Brien Lake - 1991 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1991-Mar-11 |
| Date Last Modified | 2023-Sep-29 |
| Created By | |
| Revised By |
Primary Commodities: Copper, Platinum, Palladium
Secondary Commodities: Nickel, Gold
Township or Area: Porter
Latitude: 46° 23' 54.53" Longitude: -81° 46' 17.94"
UTM Zone: 17 Easting: 440679.91 Northing: 5138612.15 UTM Datum: NAD83
Resident Geologist District: Sudbury
NTS Grid: 41I05NW
Point Location Description: General
Location Method: Conversion from MDI
Access Description: 1.3KM EAST OF SOUTH EAST SHORE OF O'BRIEN LAKE.
1993-1995: Cameco Corp. - ground geophysics, 3 diamond drill holes totaling 847m, geological mapping, stripping, microscope studies, and soil sampling. 1992: D. Brunne & M. Turcott - decorative stone sampling & prospecting 1999: Dan Brune carried out overburden stripping and sampling. 2001-2004: Ursa Major Minerals Inc. - mapping, sampling, prospecting, airborne geophysics
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| Porter-SP004 / 2.15948 | 41I05SW0001 | 41I05SW0001 |
| Porter-SP008 / 2.20100 | 41I05NE2001 | 41I05NE2001 |
| Porter-SP003 | 41I05NW9700 | 41I05NW9700 |
| Shibananing-SP003 | 41I05NW0010 | 41I05NW0010 |
| om94-051 | 41I05NE2018 | 41I05NE2018 |
| Porter-SP011 | 41I05NE2009 | 41I05NE2009 |
| Porter-SP009 | 41I05NE2009 | 41I05NE2009 |
| Shakespeare-SP021 | 20000000230 | 20000000230 |
Province: Southern
Subprovince: Cobalt Basin
Supergroup: Huronian Supergroup
Formation Group: Cobalt Group
Geological Age: Paleoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Gabbro | 1 | Nipissing Gabbro | Host |
|---|
Sep 24, 2019 (Sheree Hinz) - The property is underlain by a variety of clastic sedimentary rocks including conglomerate, sandstone, sub-greywacke, and siltstone. The finer clastic rocks are interbedded with thin limestone units. The sedimentary stratigraphy is disrupted by a subparallel sill. The sill, which varies in composition from dioritic to gabbroic, is related to the Nipissing intrusive suite. All the lithologies on the property trend at approximately 070 degrees and dip mostly to the southeast, ranging from 30 degrees to vertical. Fyon et al. (1991) speculate that a genetic relationship may exist between the Nipissing intrusive and polymetallic skarn mineralization.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Chalcopyrite | Economic | Ore | ||||
| 3 | Pyrrhotite | Economic | Ore | ||||
| 4 | Arsenopyrite | Economic | Ore |
Sep 24, 2019 (Sheree Hinz) - Gold mineralization at the main skarn is associated with garnet-pyroxene and pyrrhotite-garnet-pyroxene skarn. Grab samples of this lithology returned 3.0 g/t Au. Returns of 14.7 g/t were found in the arsenopyrite-quartz vein fracture. High PGE’s are associated with chalcopyrite and pyrrhotite disseminated in gabbro. Dan Brune reported assays from a diorite grab sample with 14ppm Pd and 1ppm Pt, and a 50cm diorite channel sample contained 0.93% Cu
| Rank | Classification |
|---|---|
| 2 | Mafic-Ultramafic Intrusion |
| 1 | Skarn |
Book - Frank Racicot, personal communication
Publication Number: Date: 1991
Author:
Publisher Name:
Location:
Map - Porter Township, District of Sudbury, Ontario
Publication Number: M2011 Scale: 1:12,000 Date: 1997
Author: Ginn R.M.
Publisher Name: Ontario Dept. of Mines
Location:
MonoMap - Geology of Porter Township
Publication Number: R005 Date: 1997
Author: Ginn R.M.
Publisher Name: Ontario Dept. of Mines
Location:
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