Mineral Deposit Inventory for Ontario

Ministry of Energy, Northern Development and Mines

Deposit: MDI000000002354

General

Commodities

Primary Commodities: gold

Location

Township or Area: McComber

Latitude: 49° 38' 54.48"    Longitude: -87° 52' 53.47"

UTM Zone: 16    Easting: 436365   Northing: 5499920    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E12NW

Point Location Description: Trench 1 on map in Assessment report 42E12NW2007

Location Method: data compilation

Access Description: The property can be reached by a bush road which runs north from Highway 11 at a point 8.0 km east of the town of Beardmore. This road is identified by the TCPL sign "76.50 0.20". The road enters the property about 600 m from the road, and then proceeds a further 2.4 km to the trenches and stripped areas around "Hematite Hill".

Exploration and Mining History

1930s: prospecting, trenching, and sampling was carried out by unknown parties. 1988: Coulson Explorations Ltd. contracted Terraquest to fly a detailed airborne magnetic and VLF-EM survey. 1995-97: R. Cote carried out prospecting, stripping, and sampling. 1998: Angle Lake Explorations Inc. carried out trenching, mapping, sampling, and magnetic, VLF-EM and soil surveys. 2007: Alto Ventures carried out sampling. 2008: Kodiak Exploration Ltd. carried out prospecting, stripping, and sampling. 2010: Prodigy Gold Inc. (formerly Kodiak) carried out channel sampling.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Beardmore-geraldton

Geological Age: Archean   

Mineral Deposit Lithology

Lithology Comments

10/31/2019 (T Pettigrew) - The Cote-Angle Lake property is located entirely within the southern metasedimentary unit, at the western end of the main Beardmore-Geraldton belt (Mason and White, 1997). The majority of the iron formation in the area is typical of the iron formations of the Beardmore-Geraldton greenstone belt. It consists of thin (+/-1 mm) laminae of magnetite separated by equally thin laminae of dark grey-green chloritic argillite. Around Hematite Hill, a variety of different iron formation lithologies appear. The most obvious is hematite-magnetite iron formation with only minor interbedded argillite. This may occur, as in trench 10, as bands within or beside the more common magnetite-argillite iron formation. It may also form, as in Trenches 1B and 7, beds up to 4 m thick. Hematitic iron formation is almost always more thickly bedded than magnetite iron formation, with hematite bands typically 1-2 cm thick. Greywackes, arkose and argillites comprise a turbidite sequence typical of the area. The greywackes form beds between 10 cm and 2 m in thickness. Typically, the thicker beds tend to be coarser-grained and may contain clasts up to 3-5 mm in diameter. The argillites form beds from 5 cm to (rarely) 3 m thick between the greywackes. Graded bedding is not well developed in the greywacke units. The argillites are grey, fine-grained schistose rocks that are composed of quartz, feldspar, chlorite and sericite. Conglomerate occurs interbedded with the greywacke-argillite sequence. It forms beds which vary from lenses 10 cm thick and a few metres long, to more continuous layers up to 5 m thick which can be traced with reasonable assurance of continuity for up to 150 m along strike. As with the greywackes, the thicker conglomerate beds tend to contain the larger clasts (Assessmnet report 42E12NW2007).

Mineralization

Mineralization Comments

10/31/2019 (T Pettigrew) - Trench 1 lies along the southern contact of the iron formation with south-lying wacke sediments. It is along and immediately adjacent to this contact area that gold-bearing mineralization apparently occurs with arsenopyrite in a viable (along strike) altered, fractured, hematitic, carbonatized (ankerite) and quartz-flooded zone about one to two metres wide. The alteration zone strikes westward to about 9+26W where it seems to disappear. Only wacke sandstone contacting banded magnetite is visible in outcrop slightly west at 9+40W. At 9+04W to 9+ 12W hematite and magnetite appears as a mass (non-banded) with sinuous north striking quartz tension veins. Arsenopyrite occurs here mainly as clotty segregations and masses up to 4 cm. thick, associated with quartz. In the area of an old blast pit at 8+90W to 9+00W considerable vein quartz occurs as irregularly fragmented segments. Irregular blebs and clots of arsenopyrite are associated with the quartz veins. This area of the mineralized zone is hematitic and non-magnetic. On its north side it contacts distinctly finely banded magnetite in wacke sandstone. At 8+70W to 8+84W the zone is one to two metres wide, non-magnetic, contains rusty hematite blebs, is weakly carbonatized, and contains 30% to 50% white quartz veining with local associated clots and blebs of arsenopyrite. This segment of mineralized zone extends eastward under overburden cover. The magnetite iron formation unit (with some jasperitic bands), hosting the mineralized zone, which is 1 to 2 m wide at Trench No. 1, ranges from 15 to 18 m wide. In addition to the coarse arsenopyrite, 2 to 3% pyrite and up to 1 % chalcopyrite was noted within the main zone of mineralization. Intense chlorite alteration with lesser amounts of sericite, predominates. In some areas, gold appears to be associated with coarse-grained arsenopyrite and quartz veining. Geochemical analysis of selected grab samples at these locations along strike (main No. 1 Trench) returned values from 0.13 to 0.30 ounce per ton gold (Resident Geologist's Files, Beardmore-Geraldton-District, Thunder Bay). Additional grab samples collected from pyritic (i.e., 1 to 2%) greywacke units within the iron formation assayed up to 0.06 ounce per ton gold (Mason and White, 1997). An extensive set of ladder veins is exposed in trench 1. They occur in a band of intensely ankeritized greywacke up to 5 m wide between to iron formations. The ladder veins vary from straight to sigmoidal, with an S-shaped profile suggesting sinistral shear. The widest vein is 50 cm wide, and its central part, which dips west at 40 degrees, contains patches of coarse arsenopyrite. Grab samples taken by Mr. Cote yielded assays up to 9.3 g/t Au. The ankeritized band in trench 1 extends for a length of approximately 60 m. To the west it narrows and is bordered by less altered greywacke which is not cut by the ladder veins. To the east it narrows as the iron formations to the north and south converge. It is truncated by a NW-SE fault at the east end. Trench 3 exposed two bands of iron formation, of which the southern band is now covered by water. This contained a narrow zone of finely disseminated arsenopyrite. A sample of this material taken by Mr. Cote (TR3-1) contained 556 ppb Au. In trench 4, there is a similar band of fine arsenopyrite in iron formation. A lens of quartz with coarse arsenopyrite in this arsenopyrite-bearing band was sampled by Mr. Cote in 1996 (sample #4-5). It contained 3.5 g/t Au (Assessment report 42E12NW2007).

References

Publication - Beardmore-Geraldton Resident Geologist’s District – 1996; In: Report of Activities, 1996, Resident Geologists p. 1-17 to 1-19

Publication Number: OFR5958    Date: 1997

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

Publisher Name: OGS

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Ministry Contact Information

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