The Citronen Lead-Zinc Project is in the northern part of Greenland, adjacent to deep and protected water. It is a world-class deposit with an expected long mine life, but the remote location and extreme northern climate require specialized services to support development.

The Citronen Zinc-Lead Project represents one of the world’s largest undeveloped zinc-lead resources—in excess of 13 billion pounds of contained zinc and lead metal. Tetra Tech’s team worked in collaboration with Ironbark Zinc Ltd. to complete the detailed feasibility study for the Citronen Project. Tetra Tech developed the full underground and surface mine design, including detailed rock mechanics, tailings design, water management, mine plan design, production schedule, process design and layout, plant infrastructure, and peer review.

The study involved an international team of engineers from Denmark, Sweden, England, Canada, and the United States; the client was based in Perth, Australia. Tetra Tech’s diverse professional staff worked with these other engineers to provide an integrated project team ready to optimize overall solutions.

The scope of this work included:

  • Project management and mine engineering
  • Peer review for geology, processing, and contribution to the infrastructure aspects of the project
  • Underground geotechnical, tailings design, and water management expertise
  • Mine plan design and mine production schedule
  • Review of drill program suitability for process design
  • Process design and process area layout
  • Tailings waste and water management
  • Plant infrastructure, including stores and warehousing layout
  • Capital and operating cost estimate to ±15 percent level of accuracy