Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI000000001308

Record: MDI000000001308

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Copper

Location

Township or Area: Summers

Latitude: 49° 37' 45.19"    Longitude: -87° 57' 53.87"

UTM Zone: 16    Easting: 430314   Northing: 5497854    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E12NW

Point Location Description: Stripped area approximately 10 m in diameter

Location Method: Field Visit with GPS

Access Description: The showing is located approximately 70 m south of Highway 580 at a point 2.0 km west of the Highway 11 junction.

Exploration History

1984: Golden Crown Resources Ltd. carried out an EM-16 survey and soil sampling. 1994: J. McMahon conducted a VLF-EM survey. 2006: R. Cote discovered the showing and carried out prospecting and sampling. 2012-13: R. Cote carried out prospecting, trenching, and sampling.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Beardmore-Geraldton

Geological Age: Archean  

Geology Comments

Nov 04, 2019 (Therese Pettigrew) - The area was mapped by Hart, ter Meer and Jolette (2002) and is underlain by east-northeast-striking, steeply dipping clastic metasedimentary rocks and banded iron formation of the Southern Metasedimentary Sub-belt of the Beardmore–Geraldton greenstone belt. A number of recently stripped areas have exposed interbedded, buff to grey, sandy wacke and dark, greenish grey, silty turbiditic wacke. The rocks have been pervasively iron carbonate-altered and contain disseminated, fine-grained pyrite. Sheared, fissile and rusty zones with either disseminated blebs or dismembered veinlets of iron carbonate, with chlorite and sericite, are parallel to slightly oblique to foliation. There are also some ptygmatically folded quartz veinlets and foliation-parallel veinlets, also containing iron carbonate and disseminated pyrite. Several generations of quartz veining are suggested by crosscutting relationships. Hart, ter Meer and Jolette (2002) also noted the occurrence of pyrite, chlorite and quartz veins in the immediate area; axinite, locally thought to be a pathfinder for gold, was noted as well.

Lithology

Lithology Comments

Nov 04, 2019 (Robert Cundari) - The main showing (UTM 430314E 5497854N) is exposed in a stripped area approximately 10 m in diameter. Sandy and silty wacke units, foliated at 083º, are transected by slightly oblique, iron-carbonatized, shear zones up to 1 m wide. The shear zones are characterized by increased fissility and schistosity, with or without anastomosing quartz-carbonate veinlets and rusty gouge. A prominent set of parallel quartz veinlets occurs at 065 degrees.

Mineralization

Mineralization Comments

Nov 04, 2019 (Robert Cundari) - Pyrite and arsenopyrite may constitute up to 20% of sulphide-mineralized veins and wall rock. Altered and sulphide mineralized rocks in the stripped zones returned nil to only slightly anomalous gold values. However, a rusty weathering zone with semi-massive, subhedral to euhedral pyrite and arsenopyrite in a silicified, iron-carbonatized, phyllite returned 1.26 ounces Au per ton from one grab sample, and 1.15 ounces Au per ton, 2 g/t Ag and 232 ppm Cu from another (Resident Geologist’s Files, Thunder Bay North District, Thunder Bay). Earlier sampling of the same zone also returned over 1 ounce Au per ton (R. Cote, Prospector, personal communication, 2006). Initial observations suggest that the main mineralized zone is roughly foliation-parallel and comprises a number of anastomosing (perhaps conjugate) structures within a broad zone of iron carbonate-chlorite-sericite alteration up to 8 m wide. Anastomosing quartz veins occur on a smaller scale as well, reflecting zones of dilatancy. Dismembered,folded banded iron formations nearby (e.g., at UTM 429872E 5497753N) with attenuated “horsetail” fold hinges attest to the localized high degrees of strain (Smyk et al., 2007).

Nov 04, 2019 (Therese Pettigrew) - Grab sample 1138467 from Trench 4 assayed 16.745 ppm Au from a rusty quartz ankerite hematite carbonate with 4% sulphides. Channel sample 1138331 from the main Broken Heart showing assayed 12.762 ppm Au over 1 m from a banded quartz chloritic sericite with 20% pyrite and arsenopyrite (Assessment report 20000008578). Sample G31264 returned 62.8 g/t Au, 13.1 g/t Ag, and 337 ppm Cu from pyritic metasediment between converging bands of BIF. The pyrite (estimated at 10-20%) occurred as fine grained (Assessment report 20000008634).

Assay Samples

Mineral Record Details

References

Map - Precambrian Geology of Eva and Summers Townships, Beardmore Area, Northwestern Ontario

Publication Number: P3513 Scale: 1:20,000    Date: 2002

Author: Hart T.R., ter Meer M., Jolette C., Thibeault S., Robinson A.

Publisher Name: Ontario Geological Survey

Mono - Report of Activities 2006, Resident Geologist Program, Thunder Bay North Regional Resident Geologist Report: Thunder Bay North District

Publication Number: OFR6201 Scale:     Date: 2007

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

Publisher Name: Ontario Geological Survey

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