Corner Bay - Doré Copper Mining Corp

Corner Bay

Location20 km south of Chibougamau, QC
Ownership100% Dore Copper
HistoryDevelopment: ramp to 115 m; bulk sample of ~40k tonnes averaging 2.48% Cu and 0.44 g/t Au
CommoditiesCopper and gold
Current StatusAdvanced exploration
Mineral Resources (2019)Indicated: 1.35 Mt @ 3.01% Cu and 0.29 g/t Au, containing 89.8 M lbs of copper and 13,000 oz of gold Inferred: 1.66 Mt @ 3.84% Cu and 0.27 g/t Au, containing 140.3 M lbs of copper and 15,000 oz of gold

OVERVIEW

Dore Copper, through its wholly-owned subsidiary CBAY Minerals Inc., holds a 100% interest in the Corner Bay Project located in the vicinity of Chibougamau, Québec. 

Corner Bay is a significant high-grade copper-gold deposit located on the south flank of the Lac Dore Complex. Its was discovered in the early 1980s and accessed by a ramp to 115 meters in 2008. No past production is reported although an underground bulk development sample of approximately 40,000 tonnes was mined and processed at the Copper Rand mill in 2008. Mill recoveries were 94% for copper and 62% for gold.

The Company, while operating as a private company, completed a drilling program of 14,047 meters in 14 holes (including wedges) in 2017-18 and reported a NI 43-101 mineral resource estimate in 2019. Subsequently, Dore Copper completed 10,237 meters of drilling in 2020 which successfully expanded the deposit.  

Dore Copper is completing a 30,000-metre drilling program in 2021 which will lead to an updated mineral resource estimate in early Q3 2021 followed by a PEA in late 2021 to support an eventual hub-and-spoke operation with Corner Bay as the main feed to its 100% owned Copper Rand 2,700 tpd mill.  

The Corner Bay deposit was discovered in 1982 by a joint venture between Corner Bay Exploration Ltd. and Rio Algom Inc. In 1995, the property was acquired by Ressources MSV Inc. which subsequently merged with Campbell Resources Inc. and carried out several exploration drilling programs up to 2008. An initial mineral resource estimate was prepared in 2006. In 2008, Campbell initiated an underground bulk sampling program by driving a ramp down to 115 meters and establishing three levels (-55 m, -75 m, and -105 m). Development muck totalling 40,119 tonnes averaging 2.48% Cu and 0.44 g/t Au was processed at the Copper Rand mill with recoveries of 94% for copper and 62% for gold. At the end of 2008, Campbell suspended the bulk sample exploration program at Corner Bay.

In 2017-2018, a 14-hole (including wedges) drilling program totalling 14,047 meters on the Corner Bay project was completed. The positive results from the program expanded two areas of mineralization: Main Vein below the dyke and the Lower Deep Vein. Following this program, the Company reported a mineral resource estimate of 1.35 Mt averaging 3.01% Cu and 0.29 g/t Au, containing 89.8 M lbs of copper and 13,000 ounces of gold in the Indicated category; and 1.66 Mt averaging 3.84% Cu and 0.27 g/t Au, containing 140.3 M lbs of copper and 15,000 ounces of gold in the Inferred category.

In 2020, Dore Copper completed 10,237 meters of drilling at Corner Bay. The program successfully extended the Main Vein below the dyke 200 meters along strike to the south and over 500 meters vertically. Both the Main Vein and Lower Deep Vein remain open along strike and down plunge to the south and up plunge to the north.

Dore Copper is completing a 30,000-metre drilling program in 2021 which will lead to an updated mineral resource estimate in early Q3 2021 followed by a PEA in late 2021 to support an eventual hub-and-spoke operation with Corner Bay as the main feed to the Company’s Copper Rand 2,700 tpd mill.  

The Corner Bay property is located on the southern flank of the Lac Dore Complex. It is in contact with an intrusive breccia, a transition zone between the Chibougamau Pluton and the Lac Dore Complex. A wide zone (300-450 m) of pyroxenites, gabbros, and magnetite rich mafics, associated with the Layered Zones, separates this breccia from the gabbroic anorthositic sequence which represents the most important lithology on the Corner Bay property. 

The anorthositic sequence hosts the copper mineralized shear (approximately N-S, dipping 70° west) which extends from surface down to 1,300 meters vertically (open) and 800 meters along strike (open). Mineralization consists mostly of pyrite and chalcopyrite with sporadic pyrrhotite. The alteration is characterized by sericitization and intense chloritization in proximity to the mineralization and within the shear in general. The ore body is bisected by the regional Gabbro Isle dyke, a large north-south striking diorite dyke dipping sub-vertical. There are numerous conjugate and parallel mineralized structures beyond the main shear that remain to be drill tested.

The Corner Bay deposit consists of four mineralized narrow veins: Main Vein 1, Main Vein 2, Main Vein below the dyke, and Lower Deep Vein. Main Veins 1 and 2 reach the top of the bedrock but are covered by overburden. Main Vein 1 extends down dip to the contact with the Gabbro Isle dyke, while Main Vein 2 is mainly located in the upper part of the deposit. Main Veins 1 and 2 are parallel, close to each other, and strike north-south dipping 70° to the west. The mineralization ranges in thickness from 0.4 to over 20 meters (the deposit has been modelled with a 2-meter minimum true thickness). The Main Vein below the dyke is the continuation of the mineralization above in Main Vein 1&2, but as the name implies, it is located below the Gabbro Isle dyke and dips 80° towards the west. The Lower Deep vein is a deeper lens in the same shear, with the same general orientation as the other veins, dipping 65° west. 

MAPS & SECTIONS

Isometric view
Long section view below the dyke
Long section view above the dyke
Surface Geology
Location map
Surface Infrastructure
CB-21-32_5.5m at 3.46% Cu
CB-21-32W1_6.8 meters at 3.67% Cu.