The Éléonore Operations host the Roberto gold deposit, which consists of the Roberto, East Roberto, and Zone du Lac lenses.

The Roberto deposit is a clastic sediment-hosted stockwork-disseminated gold deposit.

Roberto Deposit
The Roberto deposit has historically been divided into the Roberto, Roberto East, Zone du Lac, North and Hanging Wall Zones. This nomenclature is based on their geographical location and the main alteration types observed. All of the zones are made up of many individual mineralized lenses.

The host rock of the mineralized zones is typically a thinly-bedded greywacke (bed thickness approximately 10 cm) near the contact with a massive greywacke unit, and locally, with a thin conglomerate unit. The steeply east-dipping Roberto East fault, marked by a thin black tourmaline marker band, forms the eastern limit of the mineralized vein cluster.

The structural hanging wall of the mineralized zones is characterized by a greywacke containing centimetre-scale aluminosilicate porphyroblasts overlain by a thin conglomerate unit. The aluminosilicate-bearing greywacke and the conglomerate appear tightly folded, with axes generally oriented in the east–west direction and refolded by the F2 event. This folding is in sharp contrast with the generally north– south-trending bedding in the mineralized zones. The structural footwall of the mineralized zones is characterized by greywacke, locally exhibiting a higher metamorphic ........

The current mining method is longitudinal longhole retreat stoping, with sublevel intervals at 30 m spacing. The mine has been divided into seven mining horizons to allow for several simultaneously-active mining fronts.

As of October 2018, ramp development reaches a depth of approximately 1,130 m from surface while production had started in Horizon 5, on the 980 m Level.

The main infrastructure, including the production shaft, is located in the orebody hanging wall. There are four access points, consisting of the surface portal with an internal ramp, and three level accesses from the production shaft on the 400, 650 and 1140 m Levels.

Each level has electrical bays, sumps, ventilation accesses, backfill accesses, a refuge station and dumping bays. The main haulage drifts are located in the orebody hanging wall and are positioned 30 m from the expected ore contours. Ore access points (i.e. drawpoints) are situated about 100 m apart and each has a backslash at the intersection with the main haulage drift to allow for efficient truck loading.

The ramp is driven at a maximum gradient of -17% and is positioned to cross predicted faults in a perpendicular manner.

For mine scheduling purposes, the vertical extent of the orebody is subdivided into two parts: the upper part of the orebody located between 65 metres and 650 metres below surface (Upper Mine), and the lower part of the orebody located between 650 metres and 1,190 metr ........

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The Éléonore plant uses conventional mineral processing equipment to produce a marketable gold doré.

The main process infrastructure consists of a crushing plant, ore storage bins, a grinding and gravity gold recovery circuit, a flotation circuit, a flotation tails cyanidation and CIP circuit, a flotation concentrate regrinding, cyanidation and CIP circuit, a Zadra stripping circuit, a gold refinery, concentrate and tailings dewatering circuits and a paste backfill system.

The crushing area is designed for a capacity of 8,500 t/d, including waste crushing (1,500 t/d), while the other plant areas are designed for a processing capacity of 7,000 t/d at 95% availability.

Comminution consists of conventional three-stage crushing circuit followed by a single stage of closed-circuit ball milling, to a P80 of approximately 65 µm. Within the ball milling circuit, a gravity concentration circuit consisting of two Knelson concentrators recovers coarse liberated g ........