The Bracemac-McLeod deposits comprise a cluster of polymetallic VMS lenses. All shallower deposits are now mined-out and only the McLeod Deep lens remains. Mineralization - Bracemac Deposits The Bracemac deposit comprises three distinct lenses, Bracemac KT (BKT), Bracemac Main (BRC) and Upper Bracemac (uBRC), forming a stacked sequence interpreted as resulting from reactivation of an hydrothermal system along a synvolcanic structure following deposition of the Wabassee Group hanging wall basalts. Upper Bracemac Zone The uBRC is a small tabular lens oriented approximately N130° and dipping at -62°. The upper part of the lens is probably coming to surface under 30 to 35 m of overburden. The longest axis of this orebody is about 150 m long, plunging to N275° / -45°, and the shortest about 75 m long plunging to N150° / -45°. The uBRC lens is roughly located 80 m over the BRC zone. The sulphides of this zone are semi-massive and count for 35 to 50% of the rock, the rest being mostly basalt, tuffite, magnetite, black chlorite (Chl), quartz (Qz) and calcite (Cal) veins. Typically, the zone is composed of 20-25% sphalerite, 15-20% pyrite, 15-20% pyrrhotite and 2-3% of chalcopyrite. Bracemac Main Zone The Bracemac Main zone (the designation has later been shortened to Bracemac - BRC) is a flat shaped body oriented at N093° and inclined at -74°. Its longest axis is over 225 m long and is plunging through N250° / -50°. Its shortest axis is 130 m long, plunging at N110° / -40°. The ........

All shallower deposits are now mined-out and only the McLeod Deep lens remains. The end of mine life is estimated as the end of June 2022.

A first section of underground ramp 2.4 km long provides access to the Bracemac deposit. This then extends for 1.2 km to reach the McLeod deposit. By the end of the McLeod Deep lens operation, the ramp will have reached a length of approximately 10 km. The ramp portal is located in the mining pit of the Bell-Allard South site. A network of ramps allows the exploitation of the Bracemac and McLeod deposits which extend respectively from 70 m to 600 m and from 360 m to 1490 m in depth from the ground surface.

Ore mined from the Bracemac-McLeod mine is processed at the MLM site's concentrator to produce zinc and copper concentrates. Tailings are sent to the tailings site. Waste rock is used underground as a rock fill, whether cemented or not. The main infrastructures as well as the access ramp portal are located on the former Bell-Allard Sud site; an old open pit operated between 1968 and 1970.

The current extraction method at Bracemac-McLeod is sublevel open stoping.

Operations are maintained 365 days a year.

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