The gold deposits in the Val-d’Or area are consistent with the orogenic gold model. Orogenic gold deposits are typically distributed along first-order compressional to transpressional crustal-scale fault zones that mark the convergent margins between major lithological and/or tectonic boundaries such as the Larder Lake–Cadillac Fault Zone.

Most orogenic gold deposits in Archean terranes are hosted in greenstone belts. In the Lamaque Project area, competency contrasts are the most important localizing host rock control. At Lamaque and Triangle the intersection of shear zones with late diorite to granodiorite plugs host the main gold-bearing veins, whereas at Sigma and Ormaque a syn-volcanic diorite (the C-porphyry) hosts mineralization near the sheared contact with the surrounding volcaniclastic rocks.

Orogenic gold deposits develop in response to shear failure, extensional failure and/or hybrid extensional shear failure. In the Lamaque Project area both shear veins and extension veins are widely recognized, and their identification is important to constrain vein geometries and ore shoots. In the Triangle deposits the main C vein structures are steeply dipping shear veins and host the bulk of the resource, whereas in the Ormaque deposit gently dipping extension veins contain most of the ore.

Sigma Mine
Auriferous veins at the Sigma mine consist of quartz and tourmaline with lesser carbonates, muscovite, pyrite, scheelite, chlorite and ch ........

The deposits that currently make up the Lamaque property include:
- Upper Triangle (zones C1 to C5);
- Lower Triangle (zones C6 to C10);
- Parallel;
- Ormaque;
- Plug No 4.

The primary mining method that is currently used at Lamaque is mechanized longhole stoping. The existing mobile equipment fleet of conventional equipment, mine infrastructure, and services, as well as workforce skillsets are based on longhole, and this method will continue to be used. Ore is transferred to surface using 45-tonne rated underground haulage trucks in the newly developed Sigma Ramp to the surface ore pad near the Sigma mill facility.

The current longhole stoping mining method will be maintained in the proposed mining of the Lower Triangle deposit.

In the proposed mining of the Ormaque deposit, drift and fill (DAF) mining methods will be employed due to the shallowly-dipping orientation of the mineralized zones, allowing for near-complete recovery of mineralization and providing better selectivity while allowing low grade material to be left in the stopes. New low-profile mining equipment will be required to reduce mining heights to 2.4m and reduce external dilution.

The mine operation is currently using cemented rockfill (CRF) and unconsolidated rockfill as backfill. In the proposed Lower Triangle and Ormaque mine plans, addition of a paste fill plant is included in the growth capital to provide cemented paste fill. Minera ........

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