2011 GSA Annual Meeting in Minneapolis (9–12 October 2011)
440 Thursday, 13 October 2011
7:00 AM-7:00 PM, Minneapolis Convention Center: Ballroom A Foyer, 2nd Ave. Entrance

Anatomy of a Mineralized (Cu-Ni-PGE) Mafic System, the South Kawishiwi Intrusion of the Duluth Complex **CANCELLED**

Primary Leader: Dean M. Peterson
Leader(s): Joshua Feinberg, Kevin Boerst
Field Trip Description: The troctolitic South Kawishiwi Intrusion (SKI) of the Duluth Complex is one of Earth’s great untapped resources of Cu-Ni-PGE and is actively being explored by four companies (Duluth Metals Limited, Twin Metals Minnesota, Franconia Minerals Corporation, and Encampment Resources). Together, these companies have qualified, through NI 43-101 resource estimates, 1.95 billion tons of indicated and inferred resources in five deposits (Nokomis, Spruce Road, Birch Lake, Maturi, and Serpentine), including 23.3 billion pounds of Cu, 7.8 billion pounds of Ni, 456 million pounds of Co, and 15.0 million ounces of Pd, 6.7 million ounces of Pt, 3.4 million ounces of Au, and 55 million ounces of Ag. Establishing the initial conditions of the magmatic system is the most essential part of analyzing and understanding the processes that formed the SKI and its related ores. The fundamental initial conditions of the SKI that will be addressed during this field trip include: (1) the geometry of the system, footwall and hangingwall rocks; (2) the composition and initial state of crystallinity of the SKI magmas; (3) the three-stage sequence of emplacement of the magmas and their relationship to the Nickel Lake Macrodike; and (4) the location of channelized magma flow zones, their thermal anomalies and resultant ores. Particular attention will be given to the use of geophysical techniques such as anisotropy of magnetic susceptibility (AMS) for ascertaining the direction of magma emplacement in the ore deposit.
Field Trip will span: 3 days
Sponsor(s): Duluth Metals Limited

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