Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI53B14NE00011

Record: MDI53B14NE00011

General

Commodities

Primary Commodities: Zinc, Lead, Silver, Arsenic

Secondary Commodities: Gold

Location

Township or Area: Keeyask Lake Area

Latitude: 52° 58' 49.23"    Longitude: -91° 3' 46.34"

UTM Zone: 15    Easting: 630053.67   Northing: 5871839.24    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 53B14NE

Point Location Description: Assessment Report

Location Method: Data Compilation

Access Description: Helicopter or float plane from Eyapamikama Lake, then a 2 km walk or ATV ride north

Exploration History

1984: Reconniance prospecting was completed over the claims. 1996: Northern Dynasty Minerals completed geochemical sampling and a drill testing with a winkie drill. 1987: Northern Dynasty Minerals completed detailed mapping and prospecting and drilled 1 710 m over 14 DDH. 1988: Northern Dynasty Minerals drilled 1 681 m over 4 DDH holes. 2000: Northern Dynasty Minerals completed lithogeochemical sampling from three drill holes completed in 1987 and 1988.

Assessment Work on File

Geology

Province: Superior

Subprovince: Berens River

Terrane: North Caribou

Domain: North Caribou Core

Belt: North Caribou

Geological Age: Mesoarchean  

Lithology

Mineralization

Mineralization Comments

Mar 28, 2017 (Mark Puumala) - This occurrence is described by Parker (1999) and on p.59-62 of OFR 5698 (Piroshco, Breaks and Osmani 1989). Original desciption by Dynasty is as follows: The principal zone of mineralization on the Arseno claims centers around a highly decomposed gossan, "Main Showing", which contains pods of remnant sulphides which assay up to *.5% combined lead-zinc, 8.1 ounces/ton silver and 0.032 ounces/ton gold across a true width of 1.1 meters.

Aug 16, 2019 (Therese Pettigrew) - The main feature and exploration target within the Arseno Property is centered around a prominent and highly continuous horizon of grunerite-bearing iron formations. This horizon occurs within the "Active Zone", which comprises a variety of different lithologies. The principal zone of mineralization centers around a highly decomposed gossan, "Main Showing", which contains pods of remnant sulphides which assay up to 3.6% Zn, 4.9% Pb, 8.1 oz/ton Ag, and 0.032 oz/ton Au across a true width of 1.1 m. Subsequent mapping and geophysics outlined an extensive and persistent horizon of iron-formations which are mostly overburden-covered. The outcrop centered within the "Active Zone" comprises biotite-garnet-chlorite schist which envelopes a showing of grunerite iron formation. Disseminated pyrite and arsenopyrite, accompanied by quartz-tourmaline veining appeared throughout the outcrop. Chromium-mica alteration is strongly developed and often associated with sericite. Assay values from rock grab samples yielded values up to 35,665 ppm As and 405 ppb Au. Exploration of the property uncovered numerous arsenopyrite-quartz-tourmaline showings associated with significant galena-sphalerite mineralization within the confines of a 700 m wide ductile shear zone. Several gossans associated with massive sulphide mineralization were located within a horizon of quartz-grunerite iron-formations. Results from phase-one diamond drilling outlined subsurface mineralization values ranging up to 15.4% Zn, 1.3% Pb, 1.5 oz Ag/ton, 0.42 oz Au/ton over 0.4 metres and 6 .6% Zn, 4.1% Pb, 7.7 oz Ag/ton, 0.03 oz Au/ton over 2.1 metres. DDH 19 returned results of 5.53% Zn, 0.23% Pb, 1.18 oz/t Ag, and 142 ppb Au over 11.8 m including up to 12.21% Zn, 0.21% Pb, 1.75 oz/t Ag, and 377 ppb Au over 1.5 m. DDH 20 returned results of 3.94% Zn, 0.156% Pb, 1.06 oz/t Ag, and 163 ppb Au over 11.9 m, including up to 29.2% Zn, 1.37% Pb, 4.34 oz/t Ag, and 309 ppb Au over 0.6 m. In general, sulphides occur in massive and semi-massive bands in association with diffuse, wispy anastomosing stringer zones. Pyrite (often occurring as small euhedral grains) is nearly equal in abundance to pyrrhotite. Lesser amounts of sphalerite are intergrown with pyrrhotite while galena and arsenopyrite form diffuse bands of medium to coarse grained crystals. As in the western section, the iron formations are characterized by internal brecciation and fragmentation. Drill hole intersections outline a well defined large-scale pinch and swell boudinage geometry related to deformation (Assessment report 53B14NE0012).

Nov 06, 2014 (Q Unknown) - 1987 DDH 87A-19,20 (AF-0029): ASSAYS UP TO 5.53% ZN + 1.18 OPT AG/11.8M (#19), 3.94% ZN + 1.06 OPTAG/11.9M(20), 1985 GRAB SAMPLE (AF-0019): ASSAYS 4.9% PB, 3.6% ZN, 276.3 GPT AG and 1.1 GPT AU/1.1M, 1987 DDH PROGRAM (AF-0028): ZONE INTERSECTED IN 9 DDH, ZONE APPROX 1.3KM LONG, SEVERAL SMALLER ZONES.

Mineral Record Details

References

Mono - The geology of gold prospects in the North Caribou Lake greenstone belt, District of Kenora, northwestern Ontario

Publication Number: OFR5698 Page: 59-62  Date: 1989

Author: Piroshco D.W., Breaks F.W., Osmani I.A.

Publisher Name: Ontario Geological Survey

Location:

Article - Regional metallogeny of the northwestern Superior Province, Ontario: volcanogenic massive sulphide (VMS) mineralization

Publication Number: MP169.022 Page: 143-155  Date: 1998

Author: Parker J.R.

Publisher Name: Ontario Geological Survey

Location:

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