Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI53C13SE00086

Record: MDI53C13SE00086

General

Commodities

Primary Commodities: Copper, Gold

Secondary Commodities: Silver

Location

Township or Area: Setting Net Lake Area

Latitude: 52° 49' 46.22"    Longitude: -93° 30' 2.69"

UTM Zone: 15    Easting: 466262.64   Northing: 5853422.27    UTM Datum: NAD83

Resident Geologist District: Red Lake

NTS Grid: 53C13SE

Point Location Description: General

Location Method: Data Compilation

Exploration History

1970: Geophysical surveys and diamond drilling were carried out in this area by Minorex. 1987-89: Prospecting, geological mapping, geophysics and diamond drilling by Greystar Resources and Noramco Explorations.

Geology

Province: Superior

Subprovince: Sachigo

Terrane: North Caribou

Belt: Favourable Lake

Geological Age: Neoarchean  

Lithology

Lithology Comments

Nov 20, 2014 (Mark Puumala) - Ayres (1972) described a series of five chalcopyrite occurrences along a carbonate- and quartz-cemented breccia zone associated with an east-northeast-trending fault zone that passes through Twinpeaka Lake. Whittaker (1989) refers to the fault structure as the Northeast (NE) Twinpeaka lineament. The chalcopyrite is reported by Ayres (1972) to occur as grains, blebs and veinlets within the breccia zone's carbonate-quartz cement, as well as in quartz veins in an area to the northeast of Twinpeaka Lake. Whittaker (1989) describes the supracrustal rocks of this area as consisting of interfingered mafic (predominantly flows) and intermediate (flows and tuffs) metavolcanic rocks that contain sparsely distributed blocks and lenses of silty to argillaceous interflow metasediments. Stratigraphy in the area generally strikes northeast to east-northeast with steep northerly dip. To the north, the supracrustal rocks have been intruded by a granodiorite to diorite intrusion that has been interpreted by Whittaker (1989) to also be partially in fault contact with the metavolcanic rock-dominated sequence (i.e., on the north side of the lineament). The NE Twinpeaka lineament is described by Whittaker (1989) as a northeast to east-northeast-trending structure that extends from an area southwest of Twinpeaka Lake, extending northeastward to the south shore of Settiong Net Creek. It is described as a narrow zone of strong foliation that contains quartz and quartz-tourmaline veins on its south side. Whittaker (1989) reports significant alteration associated with the lineament/fault structure. Alteration products observed in the metasedimentary rocks include carbonate, sericitite and hematite, while hematite, chlorite, actinolite and biotite occur in the altered metavlocanic and intrusive rocks.

Mineralization

Mineralization Comments

Oct 31, 2007 (Mark Puumala) - Whittaker (1989) observed three styles of mineralization along the lineament, including sulphide mineralized (disseminated pyrrhotite, pyrite and chalcopyrite) quartz veins, sulphidized (up to 7% disseminated pyrite and pyrrhotite) silica-sericite alteration zones in metasedimentary rocks and gossanous shears (mineralized with up to 3% pyrrhotite with minor to trace pyrite and chalcopyrite) in mafic metavolcanics. Whittaker (1989) reported that the mineralized quartz veins occur in three general orientations. The most widespread vein set consists of narrow (0.5 to 2 cm), sparsely mineralized, near-vertical veins that strike in a general north-south direction. Another significant set of veins occur along the south wall of the 060-striking lineament. These veins are up to 2 m wide and strike between 080 and 100 with steep to moderate southeasterly dip. Sulphide mineralization in these veins typically occurs near the wall rock contacts. A third, less common set of shallow-dipping (25 to 40 degree) mineralized veins strikes approximately parallel to the lineament. A grab sample from one of these veins is reported by Chute (1988) to have produced the best gold assay value (22,675 ppb Au) from this zone. Surface sampling of the NE Twinpeaka lineament zone reported by Chute (1988) and Whittaker (1989) has defined a zone of anomalous gold assays (>500 ppb) extending for a strike length of at least 700 m between Whittaker (1989) sample location 16685 in the southwest and sample location 16791 in the northeast. Ten surface sample gold assays ranging from 502 ppb to 22,675 ppb Au are reported from this zone by Chute (1988) and Whittaker (1989). A diamond drill hole (NBE-88-20) advanced to test this zone by Greystar Resources was reported by Chute (1988) to have encountered a 1 m section of mineralized quartz vein material that assayed 4077 ppb Au. Grab samples collected by Ayres (1972) from this zone assayed up to 1.16% Cu, 0.03 oz/ton Au and 0.38 oz/ton Ag.

Mineral Record Details

References

File - Resident Geologist files AF RL 1987 53C/NW #52

Publication Number: Date: 1996

Author:

Publisher Name:

Location: Red Lake RGP

Book - Exploration Report for the Berens River East Property for Greystar Resources Inc.

Publication Number: AF RL53C13SE 50 Date: 1996

Author: Chute, M. 1988.

Publisher Name:

Location: Red Lake RGP

Book - Geological Report on the Berens River East Property (Greystar Resources), District of Kenora (Patricia Portion), 53C/13 for Noramco Explorations Inc.

Publication Number: AF RL53C13SE 54 Date: 1996

Author: Whittaker, P.J. 1989.

Publisher Name:

Location: Red Lake RGP

Map - Geological series, Northwind Lake area, District of Kenora (Patricia Portion)

Publication Number: P0756 Scale: 1:15,840    Date: 1972

Author: Ayres L.D.

Publisher Name: Ontario Division of Mines

Location:

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For detailed information regarding this mineral record please contact the Red Lake Resident Geologist District Office