Interra Copper Corp. (CSE: IMCX) (OTCQB: IMIMF) (FRA: 3MX) (“Interra” or the “Company”), is pleased to report the result of an age dating study on mineralization from the Gail Area completed at the Earth and Atmospheric Services Department of the University of Alberta. The study utilized rhenium-osmium age dating (“Re-Os”), a form of radiometric dating, of molybdenite from an outcrop sample. Interra collected the sample from a north-east trending (320Az), 20 cm wide quartz vein containing molybdenum, chalcopyrite and pyrite hosted in diorite, at its 206 square kilometre Thane Property in north-central British Columbia.
“This age date adds further confirmation and support for the “proof of concept” of the existence of copper gold calc alkaline porphyry mineralization of the same date as the bulk of such mineralization in the Quesnel Terrane. Attendant potassic alteration (Kspar/biotite) and quartz, magnetite, epidote, and native copper mineralogy (Afton, Kwanika) are also key components. The structural controls as evidenced by our recent drilling and airborne mag and radiometric geophysics and ground chargeability/resistivity surveys suggest further similarity with other known deposits where structure has shaped the current resource (Kwanika, Lorraine).”
Interra’s Chairman, T. Greg Hawkins, P.Geo.
The Re-Os date of (202.8 +/-0.8Ma) from molybdenite on the Gail rock sample is within the Late Triassic to Early Jurassic porphyry Cu-Au (-Mo) age of mineralization cluster of 215-205Ma observed within porphyries located throughout British Columbia. Additionally, it postdates the recently dated diorite intrusive host in the Gail area which has an emplacement date of 206.6+/-0.9 Ma1 using LA-ICPMS z^ (Laser Ablation of Zircon). For reference, the Kemess Mine has a Re-Os date of molybdenite to be 201.3 ± 1.2 and 201.1 ± 1.2Ma on two sets of main stage veins. This date overlaps with a U-Pb zircon crystallization age for the Maple Leaf Granodiorite host of 199.6 ± 0.6-Ma2.
The dating procedure involved sampling areas with visible molybdenite followed by metal-free crushing, followed by gravity and magnetic concentration methods to obtain a molybdenite mineral separate. Methods used for molybdenite analysis are described in detail by Selby & Creaser (2004) and Markey et al. (2007). The 187Re and 187Os concentrations in molybdenite were determined by isotope dilution mass spectrometry using Carius-tube, solvent extraction, anion chromatography and negative thermal ionization mass spectrometry techniques. A mixed double spike containing known amounts of isotopically enriched 185Re, 190Os, and 188Os analysis is used. Isotopic analysis used a Thermo Scientific Triton mass spectrometer collector by Faraday.
Interra is awaiting further analytical results from 9 of 12 holes drilled earlier this season, as well as from surface sampling undertaken at the Pinnacle and Gail Areas. These results are expected to be received next week. Extended waiting times of up to five times the norm continue to delay the Company’s reporting due to a very busy exploration season globally, coupled with the intense flooding and shut-off of transport routes and other factors related to the pandemic. Interra offers apologies to its loyal and patient shareholders and stakeholders and appreciate continued understanding in what has become the nature of exploration projects in a challenging logistical time.
ABOUT INTERRA COPPER CORP.
Interra is a junior exploration and development company focused on creating shareholder value through the advancements of its current assets that include the Thane Property in north-central British Columbia. Utilizing its heavily experienced management team, Interra continues to source and evaluate assets to further generate shareholder value.