John Chadwick looks at the Duluth Complex and in particular the leading positions of PolyMet and Duluth Metals. Duluth has described the complex as holding “one of the world’s largest undeveloped strategic metals deposits of it’s kind”
Duluth Metals massive potential in Minnesota was described in the December 2012 Leader. Let’s take a more detailed look at what is there. The industry has perhaps not yet realised the magnitude of the work being done and discoveries made by Duluth Metals here.
Duluth Metals’ strategy is to “systematically explore and develop copper-nickel-PGM deposits in the north of the US State of Minnesota.” With its partner Antofagasta (which holds 40%, with Duluth holding 60%) it is progressing Twin Metals Minnesota’s project through feasibility into production.
Twin Metals is focused on three deposits, Spruce Road, Maturi and Birch Lake (running northwest to southeast) in the northern part of the Duluth Intrusive Complex. These deposits are located in a zone of copper-nickel-PGM mineralisation occurring near the base of the complex at depths of 130 m to 1,300 m. Bechtel will deliver a very detailed prefeasibility study (enabling fairly quick progress to a BFS) in 2014. Bechtel Engineering was instructed to prepare the NI-43-101 PFS on the Twin Metals (formerly known as Nokomis) project based on the following parameters:
■ A vertically integrated mining complex
■ Large scale phased underground mine plan and development