The Gwillim property totals 486 ha and is located 8 km by road northwest of Chibougamau. The western part of the property (385 ha) is under a 50/50 joint venture between Dore Copper and Argonaut Gold (through its wholly owned subsidiary Prodigy Gold) with Dore Copper being the operator. The eastern part of the property (102 ha) is 100% owned by Dore Copper.
The joint venture plans to carry out exploration work on the property in 2021, including an airborne geophysical survey and a small drilling program.
Located on the joint venture land, the Gwillim mine operated between 1974 and 1976 and again from 1980 to 1984. In total 245,245 short tons were mined at a grade of 0.142 oz/t Au (4.86 g/t Au). Most of the production came from the Main zone, which extended along strike for 122 m with an average width of 2.6 m and up to a depth of 114 metres.
In 1987, two high-grade intercepts of 7 meters at 33 g/t Au and 7.9 meters at 17.9 g/t Au were drilled by Greenstone Resources at moderate depths of 200 to 300 meters at the KOD zone (300 m south of the mined Gwillim Main zone). A further 25 holes were drilled from the surface before a ramp was developed and the zone was further explored from underground in 1988 but not mined (some development through ore). In 1989, three more surface holes were drilled to depths of 400 m with one hole confirming the extension of the high-grade mineralization beyond 300 m vertical depth. An internal report from 1989 outlined a small historical resource (not NI 43-101 compliant) for the KOD Zone. No other significant exploration activities are reported after this work.
Gwillim is hosted within the Roy group in pillowed basalts and gabbroic sill. Mineralization is hosted predominantly within east-west, steeply dipping structures containing quartz-carbonate veins with limited amounts of massive sulphides. At KOD, there are two parallel east-west vein zones, approximately 50 meters apart, with the mineralization predominantly occurring in the northernmost vein. The thickness of the mineralization varies between 0.3 m and 5.0 m. The KOD zone is open along strike and downdip to the east under the lake.