The Lamaque Complex, operated by Eldorado Gold Corporation, is a high-grade gold mining and processing facility located in Val-d’Or, Québec, Canada. The site includes the Sigma Mill, which processes ore from the Triangle, Ormaque, and Parallel deposits, achieving an average gold recovery of 97%. With an annual throughput capacity exceeding 900 ktpa, the facility combines modern processing technology with sustainable practices.
- Processing Circuit: Two-stage crushing → Primary grinding (rod mill + ball mill) → Secondary grinding → Gravity concentration → Cyanide leaching/CIP → Elution/electrowinning → Refining.
- Key Metrics: 110 tonnes per hour throughput, 96-97% gold recovery, 70+ hours leach residence time.
- Crushing: Jaw crusher (1,120 × 870 mm) + cone crusher (294 kW), operating at 75% availability.
- Grinding: Open-circuit rod mill (300 kW) + closed-circuit ball mills (750 kW and 930 kW), targeting P80 of 40 µm.
- Gravity Recovery: Two concentrators recover ~14.6% of gold before leaching.
- Cyanidation: 7-tank leach circuit (10,475 m³ total volume) with sodium cyanide (0.54 kg/t consumption).
- Carbon-in-Pulp (CIP): 7 tanks with 20 g/L carbon concentration; ZADRA elution for gold extraction.
- Tailings Management: Cyanide destruction to <1 mg/L CNWAD, with future paste backfill plant (2026).
- Power & Reagents: 4.9 MW power consumption; key reagents include lime (1 kg/t) and flocculant (0.25 kg/t).
- Workforce: 50 plant personnel, including operations, maintenance, and metallurgical staff.
Source: Eldorado Gold Corporation
