Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI000000001313

Record: MDI000000001313

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Summers

Latitude: 49° 35' 8.3"    Longitude: -87° 59' 40.89"

UTM Zone: 16    Easting: 428103   Northing: 5493037    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E12SW

Point Location Description: Main iron formation on map in Assessment report 42E12SW2004

Location Method: Field Visit with GPS

Exploration History

The southwestern portion of Summers Township was the focus of extensive exploration activity during the 1930s. From 1935 to 1939, a considerable amount of surface work, including the sinking of a 24.4 m (80-foot) shaft and over 3048 m (10 000 feet) of diamond drilling, were completed on the Buffalo–Beardmore Gold Mines Ltd. occurrence in the south-central portion of the current Roxmark property (Resident Geologist files, Thunder Bay North District, Thunder Bay). Numerous other vein-related gold occurrences were discovered and worked until the early 1940s. Very little exploration activity occurred in the area until 1981 when Gold Field Resources Canada Limited conducted extensive ground magnetometer and very low frequency electromagnetic (VLF-EM) surveys over a large grid and completed 4 diamond-drill holes, totaling 484.7 m, in the northern part of the property. In 1984, Thorco Gold Finders Ltd. completed mapping, stripping, ground geophysical surveys and diamond drilling over the Anglo–Beardmore occurrence. Following an airborne magnetometer-electromagnetic survey and a reverse-circulation drilling program conducted by Legion Resources Ltd. in 1986 in southwestern Summers Township, the property was subsequently optioned by Gold Dragon Resources Ltd. and Glen Auden Resources Inc. in 1989. These companies conducted reconnaissance-scale mapping and sampling, mechanical stripping and a VLF-EM survey over claims covering the Gold Fields and Morgan occurrences in the Princess Chain of Lakes area. From 1990 to 1994, the Lafontaine partners completed extensive groundwork, involving prospecting, stripping and sampling, in the southern portion of the claim group. In 1996 the property was optioned to Explorations Minière du Nord Ltée. The company carried out extensive stripping and sampling, and completed 24 diamond-drill holes, totaling 3082 m. Much of the exploration work was concentrated along the Empire Fault in the central portion of the property and to the south in the vicinity of the Buffalo–Beardmore and Anglo–Beardmore occurrences. In 2007, the 59-claim property (divided by the Lafontaine partners into 3 separate properties) was optioned by Roxmark Mines Limited. The company initiated stripping, sampling and mapping of the old trenches and occurrences along the southern half of the property in late 2007.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Beardmore-Geraldton

Geological Age: Archean  

Geology Comments

Feb 23, 2021 (Therese Pettigrew) - The Roxmark–Lafontaine property lies almost entirely within the thickest portion of the western part of the Southern Metavolcanic Sub-belt (SVB), which is part of the main Beardmore–Geraldton belt in the southeastern Wabigoon Subprovince. It is situated immediately southwest and along strike of the Northern Empire Mine, which produced 149 493 ounces of gold at a grade of 0.35 ounce Au per ton from 1934 to 1941 (Smyk et al., 2008).

Lithology

Mineralization

Mineralization Comments

Feb 23, 2021 (Robert Cundari) - The main iron formation showing (UTM 428103 E / 5493037 N), visited by staff of the Thunder Bay North Resident Geologist office in 2007, is located near the center of the Roxmark claim group (TB 1194269 and 1194270) and is part of the western extension of the Anglo–Beardmore occurrence (Hart et al. 2002). The chertmagnetite banded iron formation can be followed along strike (240° to 245°) for 440 m, dips 85° to the north and varies from 1 to 12 m in width. Locally, weathering has resulted in extensive gossan development, particularly where sulphidization of the iron formation has occurred. These sections are commonly crosscut by quartz and quartcarbonate veins. The sulphide content at these locations averages 10 to 15%, but can be as high as 40%, and consists of pyrite, pyrrhotite, chalcopyrite and arsenopyrite. Arsenopyrite and pyrite are the dominant sulphides associated with the quartz-carbonate veining. The host rock to the iron formation consists of highly chloritized and carbonatized, massive to pillowed, mafic metavolcanic flows containing 1 to 3% pervasive, fine pyrite. A grab sample of this altered, sulphide-mineralized, massive flow unit collected by Hart et al. (2002) returned 0.08 ounce Au per ton and 158 ppm Cu. In some areas, both the mafic metavolcanic rock and the banded iron formation are tightly folded, sheared and brecciated near the most heavily mineralized sections. Assay results from a diamonddrill hole completed by Explorations Minière du Nord Ltée in 1996 across the central portion of the main banded iron formation returned 3.16 g/t Au over 1.16 m in hole LA-96-12 (assessment files, Thunder Bay North District, Thunder Bay). Selected grab samples of banded iron formation and altered metavolcanic host rocks, collected from across the central portion of the property by Explorations Minière du Nord Ltée in 1996 and 1997, returned values ranging from 2 to 89 g/t Au. Two grab samples collected by Thunder Bay North Resident Geologist Program staff from the main zone of sulphidized, chert-magnetite banded iron formation, containing 20% arsenopyrite, returned assay values of 0.03 and 0.08 ounces Au per ton (Resident Geologist files, Thunder Bay North District, Thunder Bay).

Assay Samples

Mineral Record Details

References

Mono - Report of Activities 2007, Resident Geologist Program, Thunder Bay North Regional Resident Geologist Report: Thunder Bay North District

Publication Number: OFR6217 Scale:     Date: 2008

Author: Smyk M.C., White G.D., Puumala M.A., Hinz P., Komar C.L.

Publisher Name: Ontario Geological Survey

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Ministry Contact Information

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