Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42E12SW00021

Record: MDI42E12SW00021

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Copper, Silver

Location

Township or Area: Summers

Latitude: 49° 36' 14.67"    Longitude: -87° 55' 40.62"

UTM Zone: 16    Easting: 432952.48   Northing: 5495024.83    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E12SW

Point Location Description: Shaft, pits, trenches, drill holes.

Location Method: Data Compilation

Access Description: The property is located 2.2 km due east of the town of Beardmore in the southeastern portion of Summers Township and adjoins the Northern Empire Mine (Pan-Empire Joint Venture) property to the south. The old showings can be reached by four-wheel drive vehicle along an access road, 2.4 km from the Beardmore townsite.

Exploration History

1925: Original 2 claims staked by L. Rea. 1927: claims transferred to J. Montgomery. 1928-30: Minor work performed. 1934: staked by J. Lariviere for D.B. McWilliams and surface exploration work was done. 1935: Camp buildings and assay office constructed 727.2 kg bulk sample sent for testing (from pits, trenches and 15 m shaft). 1936: McWilliams-Beardmore Mines Ltd. was incorporated. A 4152.9 m diamond-drill program carried out (at least 20 holes). 1937-1973: Various claims were cancelled and restaked. Unspecified surface work was performed. 1974: Gold Ridge Mines Ltd. carried out a soil geochemical survey and a detailed mag survey. Many small, separated mag highs and lows were outlined and most seemed to line up along two parallel trends. The pits and trenches on the known gold-bearing, sheared iron formation zone are located between the two magnetic trend lines. The magnetic trend lines have a direction of 72 degrees, the same as the regional strike of the rocks. 1975: 8 holes totalling 616 m were drilled by Gold Ridge. 1979: Minor power stripping performed. 1980: The main showing was staked by D. Thorsteinson, who carried out some surface stripping. 1981: Pancontinental Mining (Canada) Ltd. optioned the property, flew airborne EM, magnetics and resistivity surveys, and carried out geological mapping.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Beardmore-Geraldton

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (B Nelson) - The occurrence lies within the Southern Metavolcanic Sub-belt. The property is underlain by undifferentiated metavolcanics which roughly form a 2 km wide northeasterly trending belt at this location. The regional contact of the metasediments is only 0.4 km to the south. The metavolcanics are schistose and strike approximately N80 degrees E with steep to vertical dips in the vicinity of the prospect. North-south striking dykes of steeply dipping porphyritic diabase are found at the very west end of the property. A well-defined belt of low ground (containing 3 small lakes), paralleling the regional strike is present in the southeastern claims. Veining and mineralization are contained within a banded ironstone near a small shaft which is exposed along a strong 6 m wide shear zone on the south edge of this structure. A small shaft is nearby. It is suggested that this shear may be an expression of a 2.4 km long shear zone. A number of veins have been uncovered, but work eventually centered on the No. 13 Vein. A small shaft was sunk in 1935 on a highly mineralized massive white quartz vein within the ironstone, for the purpose of bulk sampling. The principal showing occurs within a 6 m wide, vertically dipping, shear zone and consists of a non-magnetic, banded ironstone containing recrystallized (sugary) chert, iron carbonate and hematite. Mineralization is commonly associated with later irregular cross fractures and sweats of massive white to vitreous quartz, and not the earlier cherty to rusty, sugary stringers following the shear. Sulphides occur as small patches and disseminations in amounts less than 1%.

Lithology

Mineralization

Mineralization Comments

Dec 07, 2005 (B Nelson) - Geochemical soil samples taken across the gold bearing shear zone returned arsenic values from 340 to 5,900 ppm. Those away from the zone averaged 40 ppm. Sulphides are generally related to the hematite bands within the ironstone. Geochemical results indicate that the gold values are associated with arsenopyrite mineralization. The arsenopyrite exists as coarse euhedral clusters and stringers. There was no underground dev't. In 1935, J.W. Evans bulk sampled and assayed the main No. 13 Vein over a length of 107 m at 7.6 m intervals. Values include 0.12 oz/ton Au and 0.04 oz/ton Ag. Grab samples taken from the dump in 1973 ranged from 0.07 oz/ton Au to 0.23 0z/ton Au.

Feb 24, 2021 (Therese Pettigrew) - The property is underlain by intermediate metavolcanics, which are highly sheared and silicified in the vicinity of the main vein (No. 13). The shear zone is conformable with the surrounding rocks, aver ages 4.6 to 6.1 m in width, and has been traced for 152 m along an east-west strike (266 azimuth). It is described as a highly banded cherty iron formation characterized by 2 generations of quartz. Gold mineralization is predominantly associated with the earlier cherty to rusty, sugary quartz stringers which follow the shear. Later veins of massive to vitreous quartz occupying irregular cross fractures are barren. Pyrite, pyrrhotite, and chalcopyrite make up 2 to 3%. Assays of 0.23 ounce gold per ton were obtained in selected grab samples from dump material along the No. 13 vein (Patterson et al., 1984).

Mineral Record Details

Site Visit Information

Date: Jan 13, 1997

Geologist: B Nelson

Notes: The Beardmore-Geraldton Economic Geologist visited the occurrence October 19, 1983, June 1, 1984, June 11, 1984 and August 27, 1985.

References

Article - 1982 report of the Thunder Bay Resident Geologist

Publication Number: MP107.004 Page: 66  Date: 1997

Author: Patterson G.C., Mason J.K., Schnieders B.R.

Publisher Name: Ontario Geological Survey

Location:

Map - Summers Township, District of Thunder Bay

Publication Number: P0602 Scale: 1:15,840    Date: 1998

Author: Mackasey W.O.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Tashota-Geraldton sheet, geological compilation series, Thunder Bay and Cochrane districts

Publication Number: M2102 Date: 1997

Author: Pye E.G., Harris F.R., Fenwick K.G., Baillie J.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Gold occurrences, prospects, and deposits of the Beardmore-Geraldton area, districts of Thunder Bay and Cochrane

Publication Number: OFR5630 Page: 409-417  Date: 1986

Author: Mason J.K., White G.D.

Publisher Name: Ontario Geological Survey

Location:

Compend - Report of activities, 1983, Regional and Resident Geologists

Publication Number: MP117 Page: 84  Date: 1984

Author: Kustra C.R.

Publisher Name: Ontario Geological Survey

Location:

File - Resident Geologist Mineral Deposit Files

Publication Number: Min Dep Date:

Author:

Publisher Name:

Location: Thunder Bay RGP

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For detailed information regarding this mineral record please contact the Thunder Bay North Resident Geologist District Office