Ontario Geological Survey
Permanent Link to this Record:
MDI52A04SE00031
| Record Name(s) | Arrow River - 1961, Denison - 1961 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1979-Aug-08 |
| Date Last Modified | 2022-Mar-02 |
| Created By | |
| Revised By |
Primary Commodities: Copper, Nickel
Secondary Commodities: Silver, Gold, Platinum
Township or Area: Devon
Latitude: 48° 2' 16.96" Longitude: -89° 43' 44.19"
UTM Zone: 16 Easting: 296591 Northing: 5324132 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52A04SE
Point Location Description: Pit location on map in AFRI 52A04SW0073
Location Method: Conversion from MDI
1961: A.E. Rissanen and A.E. Bailey conducted prospecting and discovered the showings. 1962: Denison Mines Ltd. completed prospecting, pitting, geological mapping, sampling and a magnetic geophysical survey.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 63.1212 | 52A04SW0073 | 52A04SW0073 |
Province: Southern
Formation Group: Animikie Group
Geological Age: Paleoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Terrigenous-Clastic-Unsubdivided | 1 | Adjacent |
|---|---|---|---|---|
| Diabase | 2 | Gabbro And Diabase Dykes | Host |
Mar 02, 2018 (Therese Pettigrew) - The area is underlain by Precambrian sediments which have been intruded by gabbro and diabase dykes and sills also of Precambrian age. Erosion has produced a topography of broad flat valleys bounded by high hills and ridges. One such ridge up to 400 feet wide strikes east-west through the claims and has been mapped by Tanton for several miles beyond in either direction. It is an expression of a nearly vertical gabbro dyke, at whose southern margin the copper-nickel mineralization occurs in a 25 foot wide fault zone. The fault zone consists of two or more faults within the gabbro and one fault at the contact of gabbro with the sediments to the south. The dip of this faulted contact is 85 degrees south with downfaulting of the sediments indicated by drag at the exposure near the Arrow River falls (AFRI 52A04SW0073).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcopyrite | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore |
Mar 02, 2018 (Therese Pettigrew) - Copper-nickel mineralization is present in a zone 7.6 m wide and over 1.6 km long. Grab samples from 3 pits returned assays of 0.11-0.42% Cu and 0.07-0.16% Ni (Geul, 1970). A chip samples along the eastern wall of the No.4 pit assayed 0.46% Cu, 0.38% Ni, 0.005 opt Au. 0.04 opt Ag, and a trace of Pt (AFRI 52A04SW0073).
Mono - Copper, nickel, lead and zinc deposits of Ontario
Publication Number: MDC012 Scale: Date: 1969
Author: Shklanka R.
Publisher Name: Ontario Dept. of Mines
Location:
MonoMap - Geology of Devon and Pardee townships and the Stuart Location, District of Thunder Bay
Publication Number: R087 Scale: Date: 1970
Author: Geul J.J.C.
Publisher Name: Ontario Dept. of Mines
Location:
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