Duluth Metals Limited - The Duluth Complex - The Importance of Metal in the Duluth Complex


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	Projects Overview The Nokomis Deposit Project Summary The Duluth Complex	The Importance of Metal in the Duluth Complex The Mesoproterozoic Duluth Complex and associated intrusions of the Midcontinent Rift System in northeastern Minnesota constitute one of the largest, semi-continuous, mafic intrusive complexes in the world, second only to the Bushveld Complex of South Africa. These rocks cover an arcuate area of over 5,000 square kilometers and give rise to two strong gravity anomalies (+50 & +70 mgal) that imply intrusive roots to more than 13 km depth. The geometry of three large mafic intrusions within the Duluth Complex have been modeled by the integration of field mapping and drill hole data with maps of gravity and magnetic anomalies. The igneous bodies include the South Kawishiwi, Partridge River, and Bald Eagle intrusions that collectively outcrop on the western edge of an area of greater than 800 square kilometers. The South Kawishiwi intrusion (in the north) and Partridge River intrusion (in the south) host several billion tons (each) of low-to-medium grade Cu-Ni-PGE mineralization near their base, with deposits in the South Kawishiwi hosting the highest grade deposits in the Duluth Complex. The Duluth Complex hosts one of the world's largest undeveloped repositories of copper, nickel and PGMs. In comparison to world wide deposits, the Duluth Complex is: the world's third largest accumulation of nickel sulphides the world's second largest accumulation of polymetallic copper and platinum group metals. From MGS & UM (Miller et. al., 2002) estimated that there were 13 known Cu-Ni deposits (to date) in the Duluth Complex that combined could host a theoretical resource* of 4.4 billion tons of copper-nickel ore averaging 0.66% Cu and 0.20% Ni using a cut-off grade of 0.50% Cu equivalent. *These "resources" do not conform to NI43-101 standards.