Project: Implications of Early Halo Type Veins at the IKE Copper-Molybdenum-Silver Porphyry Deposit, British Columbia
The IKE Cu-Mo-Ag porphyry deposit is located on the eastern edge of the Coast Plutonic Complex near Gold Bridge, British Columbia. Mineralization at IKE is Eocene in age and related to post-accretionary intrusions, which is in contrast to the well-studied Early Mesozoic porphyry deposits in British Columbia. Early halo type veins are concentrated in areas of high copper grade and are one of the first generations of veins in the system. The vein alteration halos are composed of sericite, biotite, chlorite, and potassium feldspar, similar to well-known porphyry deposits such as Butte, Montana and Ann Mason, Nevada.
This study aims to define the link between early halo type veins and grade, find effective vectoring tools for deeper-set porphyry mineralization, and develop a conceptual deposit model for IKE. Mineral assemblages of alteration halos will be determined using petrographic studies, and vein alteration mapping will be done on drill core to determine the composition of vein selvages at higher grade. Shortwave infrared (SWIR) spectroscopy will characterise subtle changes in mineralogy throughout the system, and will be compared to assay results to see what minerals correspond best with high grade. Temperatures and pressures of the formation of quartz veins will be defined with fluid inclusion studies aided by cathodoluminescence (SEM-CL), which will help to constrain the paleodepth of the system. A deposit model will be integrating new data with data provided by Amarc Resources, and will provide an enhanced understanding and a new exploration model.