Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52F07NE00013

Record: MDI52F07NE00013

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Boyer Lake Area

Latitude: 49° 23' 36.01"    Longitude: -92° 31' 39.04"

UTM Zone: 15    Easting: 534286   Northing: 5471290    UTM Datum: NAD83

Resident Geologist District: Kenora

NTS Grid: 52F07NE

Point Location Description: Precise

Location Method: Conversion from MDI

Access Description: The Pelham Gold Mines occurrence is located 2.4 km (1.5 miles) south of the mouth of Creek entering western end of Washeibemaga Lake. It is 1.2 km (3/4 mile) ENE of t he point where Kennewapekko Creek flows out of the northern tip of Kennewapekko Lake, and 2.7 km (1.7 miles) NW of the easternmost point of Seggemak Lake. The occurrence is 33 km (20.5 miles) SSW of Dinorwick and 50 km (31 miles) SE of Dryden.

Exploration History

1937-39: S.S. Forneri discovered the showing and carried out trenching and drilling of sulphide-rich trenches. 1948-49: Pelham Gold Mines Ltd. staked the property. There is no record of work performed by Pelham Gold Mines. 1963-72: New Calumet Mines Ltd. owned the property and carried out limited exploration. 1973-74: Osisko Mines optioned the property and carried out mapping and sampling of historic trenches. 1980-81: Sulpetro conducted airborne surveys and prospecting. 1984: Esso Resources Canada Ltd. conducted air magnetics. 1985: Teck Exploration carried out prospecting. No assessment reports were filed. 1986: Esso Resources Canada Ltd. optioned the property from Teck, carried out mapping and drilled 3 DDHs. 1988: Noranda Exploration Ltd. carried out mapping and drilled 27 DDH. 1996: Black Pearl Resources optioned the property from B. Webster and M. Galbraith and carried out geological mapping and ground magnetic, VLF, and IP surveys. 1999-2002: Goldeye Exploration carried out detailed geological mapping. 2003-06: A. Glatz and J. Rives carried out prospecting and sampling. 2007-08: Teck-Cominco optioned the property from Glatz and Rives, carried out mapping, ground magnetometer and IP surveys, dug 14 trenches, and drilled 15 DDHs. 2010: Teck optioned the property to Laurentian Goldfields. 2011: Laurentian Goldfields carried out mapping, sampling, soil sampling, lake sediment sampling, and drilled 16 DDH. 2021: Dynasty Gold Corp. optioned the property from Teck Resources and released a NI 43-101 report based on the historical work.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Terrane: Western Wabigoon

Belt: Eagle-Wabigoon-Manitou

Geological Age: Precambrian  

Lithology

Lithology Comments

Feb 24, 2010 (C Ravnaas) - The property of Pelham Gold Mines Limited comprises a patented 17 claim group (K9229 to K9234; K8769 to K8777; K8781 and K8782) that lies between Kennewapekko Creek on the west, Washeibemaga Lake on the north and east, and Thundercloud Lake on the south. The original discovery and staking were made in 1937 by S.S. Forneri, though Thomson (1934) had noted sulphides in the vicinity, and indicated them on his map (Map 42c). Trenching and diamond drilling carried out around 1938-1939 resulted in the delineation of several "ore shoots", "ore zones", and "vein systems", which were indicated on geological maps at scales of l inch to 100 feet (1:1200) and l inch to 20 feet (1:240) by W.S. Dyer and discussed in a report which listed numerous favourable assay results (Assessment Files Research Research Office, Ontario Geological Survey, Toronto). This work was done for M.J. O'Brien Limited, who had optioned the group from Forneri. The report and maps of W.S. Dyer indicate: ...fracturing and mineralization with accompanying values in gold [to be] wide spread through out the area between the large granite boss to the west and the quartz porphyry boss to the east... the best values in gold are definitely related to a mass of diorite, which...has intruded...sediments between the granite and the quartz porphyry. Dyer related the gold mineralization to: "a complex system of fracturings within the diorite itself and in zones of blocky fracturing in the sediments on the contact with the diorites." These appear to correspond to the "ore shoots" on his maps. According to him: "The best values are in lenses and veinlets of quartz mineralized with pyrite, and some pyrrhotite, in sheared diorite..." He also stated that: "zones of mineralized banded silicified diorite... carry good values". Three "zones" or "vein systems" are discussed by Dyer and for reference are shown on Figure 12 (Chart A, back pocket). The Number 3 "zone" was interpreted by Dyer to lie at the contact between diorite and sedimentary rocks, and to extend in an east-southeast direction for a length of 58 m, with an average width of 1.6 m. The average assay was indicated by him to be 39.78 per ton. In 1939 the value of gold was 335.00 per ounce. The No. l "vein system" is one of the most persistent fractures on the property, having been followed for 76.2 m, and the north end at least is still open. Dyer's maps show a number of interesting "ore shoots" entirely within the "diorite". Numerous assays show a wide but mostly low range in gold content, so that an average value is not given here. The Number 12 "vein system" also shows wide range in assay values, the highest value being 3196.70 per ton, which is presumably based on the 1939 gold value of 335 per ounce, over a width of 0.55 m. According to Dyer, "The values occur in lenses and stringers of dark quartz in sheared silicified diorite; some pyrite is present with a lesser amount of pyrrhotite". Other claim groups known as the Armstrong and Thundercloud groups were also examined at this time; however, these proved uninteresting and were abandoned. The Forneri option was also dropped following Dyer's report. The property was again optioned in 1941 by unknown parties, but no record of further work exists. Pelham Gold Mines Limited was incorporated in 1948, acquiring 17 patented and 3 unpatented claims. Some work was carried out in 1949, following which the property was idle until it was examined by P.K. Cunningham-Dunlop for New Calumet Mines Limited. (OGS R202, p. 90-93, 1981)

Mineralization

Mineralization Comments

Feb 24, 2010 (C Ravnaas) - Drilling indicates low grade, wide widths, best assay: 0.28 opt Au over 1.5 m. 5.08 opt Au from grab. The property of Pelham Gold Mines Limited comprises a patented 17 claim group (K9229 to K9234; K8769 to K8777; K8781 and K8782) that lies between Kennewapekko Creek on the west, Washeibemaga Lake on the north and east, and Thundercloud Lake on the south. The original discovery and staking were made in 1937 by S.S. Forneri, though Thomson (1934) had noted sulphides in the vicinity, and indicated them on his map (Map 42c). Trenching and diamond drilling carried out around 1938-1939 resulted in the delineation of several "ore shoots", "ore zones", and "vein systems", which were indicated on geological maps at scales of l inch to 100 feet (1:1200) and l inch to 20 feet (1:240) by W.S. Dyer and discussed in a report which listed numerous favourable assay results (Assessment Files Research Research Office, Ontario Geological Survey, Toronto). This work was done for M.J. O'Brien Limited, who had optioned the group from Forneri. The report and maps of W.S. Dyer indicate: ...fracturing and mineralization with accompanying values in gold [to be] wide spread through out the area between the large granite boss to the west and the quartz porphyry boss to the east... the best values in gold are definitely related to a mass of diorite, which...has intruded...sediments between the granite and the quartz porphyry. Dyer related the gold mineralization to: "a complex system of fracturings within the diorite itself and in zones of blocky fracturing in the sediments on the contact with the diorites." These appear to correspond to the "ore shoots" on his maps. According to him: "The best values are in lenses and veinlets of quartz mineralized with pyrite, and some pyrrhotite, in sheared diorite..." He also stated that: "zones of mineralized banded silicified diorite... carry good values". Three "zones" or "vein systems" are discussed by Dyer and for reference are shown on Figure 12 (Chart A, back pocket). The Number 3 "zone" was interpreted by Dyer to lie at the contact between diorite and sedimentary rocks, and to extend in an east-southeast direction for a length of 58 m, with an average width of 1.6 m. The average assay was indicated by him to be 39.78 per ton. In 1939 the value of gold was 335.00 per ounce. The No. l "vein system" is one of the most persistent fractures on the property, having been followed for 76.2 m, and the north end at least is still open. Dyer's maps show a number of interesting "ore shoots" entirely within the "diorite". Numerous assays show a wide but mostly low range in gold content, so that an average value is not given here. The Number 12 "vein system" also shows wide range in assay values, the highest value being 3196.70 per ton, which is presumably based on the 1939 gold value of 335 per ounce, over a width of 0.55 m. According to Dyer, "The values occur in lenses and stringers of dark quartz in sheared silicified diorite; some pyrite is present with a lesser amount of pyrrhotite". Other claim groups known as the Armstrong and Thundercloud groups were also examined at this time; however, these proved uninteresting and were abandoned. The Forneri option was also dropped following Dyer's report. The property was again optioned in 1941 by unknown parties, but no record of further work exists. Pelham Gold Mines Limited was incorporated in 1948, acquiring 17 patented and 3 unpatented claims. Some work was carried out in 1949, following which the property was idle until it was examined by P.K. Cunningham-Dunlop for New Calumet Mines Limited. (OGS R202, p. 90-93, 1981)

Jan 07, 2022 (Therese Pettigrew) - The model for the mineralization at Thundercloud is a fractionated gabbro-hosted gold vein deposit. Gold mineralization in general has a good correlation to biotite and lesser amounts to chlorite and silica alteration. Gold mineralization is present in a variety of styles including: veinlets, clots, and disseminated sulphides, although more work needs to be done to know which style contains the best grades as they often occur together. Property wide, there does not appear to be a direct correlation between sulphide concentration and gold. The Pelham area appears to have a broad correlation between high pyrite content (>5%) and gold. The rest of the property, including the West Contact, does not have such a correlation with samples of 0.5% sulphides containing up to ~2 g/t Au. The sulphide mineralogy across the property varies but pyrite is always the principal sulphide mineral and has a range in colour from very pale to dark yellow. Hydrothermal pyrrhotite is also commonly observed as a dominant sulphide mineral in the Pelham gabbro. Occasional trace amounts of chalcopyrite and arsenopyrite have also been observed. Anomalous gold values are present within all the lithologies at Thundercloud, including the Wapageisi volcanics, conglomerates (monomictic and polymictic), chloritic mudstones, QFP intrusive dykes/stock and the late mafic intrusive rocks. The strongest mineralization is found in the clastic rocks, particularly the chloritic mudstones and around the contact between the sediments and the gabbro. Gold mineralization in the West Contact and southern portion of the property has an association with the QFP dykes. Some of the QFP dykes are unmineralized while others appear to be mineralized. This suggests that this mineralization is post-felsic volcanic flows and pre-late QFP dykes and Evans (2007) suggests that this brackets the gold event temporally and spatially to the Thundercloud porphyry. The Pelham area has a slightly different style of mineralization as it has a very strong lithologic and structural control. A spatial relationship between high magnetic susceptibility, sulphides, the gabbro-sediment contact and gold is found in this area. Thin section work is ongoing to understand the relationship between alteration mineralogy, structural controls and mineralization. The most common sulfides on the property are pyrite and pyrrhotite. Chalcopyrite is much less common and was mainly observed in thin sections. Native gold was observed in one location in thin section. At the Pelham zone, the amount of style 2 pyrite and style 2 pyrrhotite generally increases with the amount of gold present. An increase in the amount of sulfides present, a change in texture from disseminated to blebby and then to wispy sulfides and a stronger parallel alignment of sulfide grains generally correlates with increased gold. An increase in the amount of pyrrhotite is more often correlated with the presence of gold: many samples with abundant pyrite but little pyrrhotite did not contain gold. The texture of pyrrhotite rimming or replacing pyrite blebs was often associated with higher gold content. However, these relationships are only general: there are many occurrences of samples with abundant sulfides and aligned pyrite blebs rimmed by pyrrhotite that contain only minor gold and samples containing some of the highest gold values encountered in 2011 contained only pyrite. (Jeffs, 2021). Drilling done by Teck and in 2011 by Laurentian Goldfields include 113 metres at 1.72 g/t gold; 60.3 metres at 1.46 g/t gold; 55.2 metres at 2.19 g/t gold, including 1 metre at 37.5 g/t, 9.3 metres at 7.91 g/t, and 21.7 metres at 4.63 g/t gold; 29.7 metres at 0.77 g/t gold, including 9 metres at 2.2 g/t gold; 68.8 metres at 1.55 g/t gold; and 81 metres at 1.31 g/t gold. The highest historical hole returned 0.6 metres grading 192.7 g/t gold.

Mineral Record Details

References

Publication - Thundercloud Property, Northwestern Ontario

Publication Number: 2021 NI 43-101 Date: 2021

Author: Jeffs, C., Thomas, D.

Publisher Name: Dynasty Gold Corp.

Location:

Mono - Gold deposits of Ontario, part 1, districts of Algoma, Cochrane, Kenora, Rainy River, and Thunder Bay

Publication Number: MDC013 Page: 240  Date: 1971

Author: Ferguson S.A., Groen H.A., Haynes R.

Publisher Name: Ontario Dept. of Mines and Northern Affairs

Location:

Mono - Gold deposits of the Kenora-Fort Frances area, districts of Kenora and Rainy River

Publication Number: MDC016 Page: 42  Date: 1976

Author: Beard R.C., Garratt G.L.

Publisher Name: Ontario Division of Mines

Location:

Mono - Geology of the Boyer Lake-Meggisi Lake area, District of Kenora

Publication Number: OFR5263 Page: 159-166  Date: 1979

Author: Blackburn C.E.

Publisher Name: Ontario Geological Survey

Location:

Mono - Feasibility of small scale gold mining in northwestern Ontario (parts of the districts of Kenora, Rainy River, and Thunder Bay), volume 1, text, volume 2, appendices

Publication Number: OFR5332 Page: 36-37  Date: 1981

Author: Neilson J.N., Bray R.C.E.

Publisher Name: Ontario Geological Survey

Location:

MonoMap - Geology of the Boyer Lake-Meggisi Lake area, District of Kenora

Publication Number: R202 Page: 90-93  Date: 1981

Author: Blackburn C.E.

Publisher Name: Ontario Geological Survey

Location:

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