$1.75b Constancia high altitude EPCM copper mine project

Constancia Copper Project
Chumbivilcas, Peru
2011 - 2015
Hudbay Peru SAC
Industry Sector
Minerals & Metals
Service Area
Mining Consulting; Process Plants; Project Delivery
Production Optimisation; Conceptual & Feasibility Studies; Copper & Mineral Processing Plants; Commissioning; Contract Operations; EPC/EPCM Contracting; Lump Sum Turn Key; Program Management

The Constancia deposit is a porphyry copper-molybdenum system that includes copper-bearing skarn mineralisation. The project is located in the Andes in south-eastern Peru and is positioned 4,100m above sea level.

Ausenco provided Engineering, Procurement and Construction Management (EPCM) services to design, construct, and commission the 25 mt/y concentrator and associated infrastructure for this high-altitude project.

Constancia is a conventional surface-mining operation based on two deposits - Pampacancha and Constancia - with the processing facility located around 1km west of the Constancia pit. The project incorporates primary crushing, twin SAG/Ball mill grinding circuit, regrind, flotation, concentrate filtration and tailings pumping capacity, as well as stand-alone molybdenum separation plant and various ancillary systems. The Pampacancha deposit is 5km southeast of the Constancia deposit and exhibits higher grades of copper and gold.

During the first years of production, Constancia plant throughput averaged 80,000 metric tons per day (mt/d), and production of copper in concentrate averaged 82,000 mt/y. Mine life is planned at 22 years (view Hudbay video).

Ausenco previously delivered to Hudbay:

  • An update of the feasibility study to improve the throughput of the concentrator comminution circuit
  • Front-end engineering design services to support development of the project including a detailed project estimate and the procurement of long lead items.

Ausenco undertook project management and engineering which was distributed across Australia, Canada and Peru. Project management commenced in Brisbane and progressively transferred to Lima as the project developed.


  • High altitude design and construction
  • High volume low grade concentrator building on our successful development of the Lumwana and Phu Kham concentrators - design developed by adapting these successful innovative projects to suit the requirements of Constancia
  • FEED services for project completed under budget and on schedule
  • 8 million man-hours LTI free for Ausenco managed scope (October 2014)
  • Commercial production 2nd quarter 2015
  • Plant performance as designed with throughput occasionally exceeding design capacity due to favourable ore characteristics, with peak of over 90,000 tonnes per day.