Electronic Thesis and Dissertation Repository

Degree

Master of Science

Program

Geophysics

Supervisor

Phil J.A MaCausland

2nd Supervisor

Gerhard Pratt

Co-Supervisor

Abstract

Drill core samples obtained from four mineralized zones of the Marathon Cu-PGE deposit in the Coldwell igneous complex have been investigated for their petrophysical characteristics. Remanent magnetization was used as a possible tool to reorient core samples but a drilling induced overprint magnetization dominated the record. Anisotropy of magnetic susceptibility was measured to provide a proxy for the petrofabric of samples obtained from oriented drill cores; a well-defined planar fabric was found to strike 177 and dip 25°W, with down-dip lineation, in excellent agreement with inferred magmatic flow direction based on 3D modeling of mineralized footwall troughs. Magnetite rich lithologies of the deposit show anomalous magnetic susceptibilities, natural remanent magnetizations, chargeabilities and resistivities which can be used as a resource vectoring tool to guide geophysical surveys in defining new feeder channels and conduit systems. Acoustic impedance contrasts between lithological units and highly mineralized zones indicate the possibility of employing seismic methods (reflection, tomography) to investigate the subsurface distribution of mineralization.


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