Ontario Geological Survey
Permanent Link to this Record:
MDI52F05NE00063
| Record Name(s) | Overflow Bay - 9999 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 2011-Feb-16 |
| Date Last Modified | 2022-Jun-13 |
| Created By | |
| Revised By |
Primary Commodities: Copper
Township or Area: Weller Lake Area
Latitude: 48° 59' 59.77" Longitude: -93° 0' .48"
UTM Zone: 15 Easting: 499990.177 Northing: 5427448.778 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52F05NE
Point Location Description: Atikwa Lake; south shore of Overflow Bay.
Location Method: Other Literature
1951: 'Noranda Mines Limited staked 6 claims to cover a magnetic anomaly under Overflow Bay and an adjacent small copper showing in altered gabbro. Two holes were drilled. (ODM, GR.111, pg.33) 'The presence of minor sulphides in partly altered gabbro on the south shore of Overflow Bay was observed late in 1951 and a group of claims were staked. During the winter a magnetometer survey was conducted, revealing a positive, east-west rending anomaly under the lake about 150 feet north of the rusty shoreline. Two diamond holes were drilled. 'In 1969, the company, under new management, made plans for new development of an open pit mine and staked additional claims early in 1970; commenced construction of a 500-ton mill.' (Kenora AF 52F/05NE, R-1, Noranda Mines Ltd.)
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 52F/05NE, R-1, Noranda Mines Ltd. | 52F05NE0032 | 52F05NE0032 |
Province: Superior
Geological Age: Precambrian
Feb 16, 2011 (J Bongfelt) - 'An area of over 6 square miles (15 square km) in the Overflow Bay-Rainmaker Lake area is underlain by grey-weathering gabbro. The gabbro is cut by diorite, quartz diorite, and pegmatite near the northern contact, and in places contains inclusions of basalt. Minor peridotite is reported to be exposed in the upper part of Overflow River, and minor pyroxenite is reported to lie close to the shore of Overflow Bay (R. Woolverton, personal communication). The gabbro, in general, is compositionally and texturally uniform. It consisted originally of 45 to 65 percent plagioclase, 25 to 50 percent pyroxene, minor amphibole, and traces of magnetite and apatite. Minute rounded grains of blue quartz are present in many rocks and may constitute up to 15 percent of the rock. The plagioclase is partly zoned and partly unzoned, and forms subhedral grains that are slightly altered at their centres to sericite and clinozoisite. Faint east-southeast alignment of plagioclase grains is evident in a few places. Remnants of both clinopyroxene (diallage) and orthopyroxene (enstatite) occur in some rocks; clinopyroxene was originally the more abundant variety of pyroxene. Amphibole has partly or completely replaced the pyroxenes, and in more highly altered rocks, has extended into areas of plagioclase. Chlorite and biotite are present in some gabbros but appear to be local alteration products. Quartz is strained and may have been introduced during intrusion of the Atikwa Batholith. The overflow Bay gabbro resembles the gabbro of Denmark Lake and is believed to be closely related to it. (ODM, GR.111, pg.14 - Overflow Bay)
Feb 16, 2011 (J Bongfelt) - 'Two holes were drilled, both of which remained in gabbro for their entire lengths. The core was slightly magnetic in places, and contained traces of pyrrhotite and chalcopyrite. The results did not warrant further exploration.' (ODM, GR.111, pg.33 - Noranda Occurrence)
Journal - Kenora Historical File 52F/05NE00063, Overflow Bay
Publication Number: Date: 2011
Author:
Publisher Name:
Location: Kenora RGP office
MonoMap - Geology of the Atikwa Lake area, District of Kenora
Publication Number: R111 Page: 14, 33 Date: 1973
Author: Davies J.C.
Publisher Name: Ontario Division of Mines
Location:
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