Calgary, Alberta–(Newsfile Corp. - June 10, 2021) - Copper Fox Metals Inc. (TSXV: CUU) (OTC Pink: CPFXF) (“Copper Fox” or the “Company”), through its wholly owned subsidiary Northern Fox Copper Inc., is pleased to provide shareholders an update on the compilation and interpretation for the Eaglehead copper project located in northwestern British Columbia.
Eaglehead (15,956 ha) is an intrusion hosted calc-alkalic polymetallic (Cu-Mo-Au-Ag) porphyry system located approximately 50 kms east of Dease Lake in Tahltan Territory. Historical exploration includes 126 diamond drill holes (36,606 metres (m)), preliminary metallurgical testwork, airborne and ground geophysical surveys, soil and stream sediment geochemical surveys, prospecting and mapping.
A 5,000m long porphyry system hosting four mineralized zones (120 mineralized drill holes); all of which remain open in several directions.
Three stages of copper mineralization including late stage, higher-grade hydrothermal breccias.
Mineralization is hosted in dioritic and granodioritic intrusives, late-stage Quartz Feldspar porphyry dikes and mafic volcanics of the Kutcho Formation.
Mineralization responds well in preliminary metallurgical testwork producing a clean, bulk copper-molybdenite concentrate with high metal recoveries.
Sr/Y and V/Sc ratios indicate that certain phases of the Eaglehead intrusive are prospective for large Cu (± Au) deposits.
Elmer B. Stewart, President and CEO of Copper Fox, stated, “The updated geological model provides greater confidence in the distribution and controls of the mineralization and trace element ratios suggest that the Eaglehead intrusive is permissive for a large copper-gold porphyry system. The compilation and modelling indicate the four zones of mineralization represent the upper levels of a paragenetically, homogeneous, large porphyry system that appears open at depth. The compilation also suggests that the main part of the porphyry could occur at depth to the north of the mineralized zone. The 2021 program is designed to explore the Eaglehead intrusive in the area underlying the Cu-Mo in soil geochemical anomaly and the area of copper mineralization. Testing this interpretation and the other studies completed to date would be beneficial should the company decide to complete a mineral resource estimate.”
The geological model in the area surrounding the mineralized zones supports a multi-phase intrusive consisting of an early-stage hornblende quartz diorite followed by biotite granodiorite and late-stage Quartz Feldspar porphyry, andesite porphyry and mafic dikes. The mineralization occurs in the intrusive phases and mafic volcanics of the Kutcho Formation. Geological mapping of the Eaglehead stock outside the mineralized area is planned in 2021.
The compilation has identified three phases of mineralization. Chalcopyrite with subordinate bornite (with low concentrations of gold-silver) occur primarily in sheet-like fractures, quartz stockwork, disseminated grains, blebs and in late-stage hydrothermal breccia. Molybdenite occurs along shear planes, in breccia, and in quartz and gypsum veinlets. Copper mineralization also occurs over a 3,000m by 2,000m area located north of the Pass-Camp-West mineralized zones.
Trace elements can be used to indicate the prospectivity of an intrusive to generate a Cu/Cu-Au porphyry system (Loucks,.2010). This study compared barren rocks with fresh or least altered samples of intrusions parental to major Cu and Cu-Au deposits worldwide and concluded that for “prospectivity assessments of igneous complexes, sites having Sr/Y > 35 at SiO2 > 57 wt.% can be regarded as Cu-fertile and that intrusive felsic porphyry suites having V/Sc > 10 are unambiguously prospective (magmatically fertile) for large Cu (± Au) deposits.”
The Si02, Sr/Y, V/Sc and Al203/Ti02 ratios for the intrusive phases hosting the porphyry mineralization at Eaglehead are shown below (anomalous intrusive phases are shaded grey):
Intrusive Si02 Sr/Y V/Sc Al2O3/Ti02
GR1 68.95 25.0 9.7 60.8
GD2 67.13 80.5 10.1 60.1
QFP1 62.87 16.6 12.8 na
QFP2 66.13 79.2 10.0 57.1
HQD1 59.99 21.4 10.5 30.7
HQD2 62.87 49.8 9.7 77.3
Historical drill programs intersected significant porphyry mineralization in 120 of the 126 holes completed along the west side of the Eaglehead stock. The drilling focused primarily on the Bornite and East zone with a limited number of drill holes on the Pass, Camp, Far East and West zones. The Pass, Bornite and East zones exhibit similar styles of mineralization and alteration patterns with Potassic and Phyllic alteration associated with chalcopyrite/bornite mineralization. The Pass and Camp zones exhibit sulphide zonation that transitions from pyrite dominant on the south to chalcopyrite on the north whereas the East and Bornite zones exhibit a chalcopyrite/bornite dominant sulphide speciation. A general description of the dimensions, grades, intervals and mineralization of the zones is presented below:
L=length, W=width, D=depth, ND=not determined, Dimensions=in metres and have been rounded.
D=maximum depth of mineralized interval intersected in DDH.
Cu=copper, grades reported based on 0.10% Cu cut-off.
Mineralized intervals expressed from minimum to maximum in meters and have been rounded.
py=pyrite, cpy=chalcopyrite, bn=bornite, mo=molybdenite.
Far East Zone
This zone is in the southeast portion of the property, approximately 3kms from the East zone. This area is under-explored.
The East zone is located approximately 400m southeast of the Bornite zone and is interpreted to be a continuation of the Bornite zone. The mineralization in both zones is open in several directions and at depth. Molybdenum concentrations are highly variable and generally lower in the Bornite zone. In general, the molybdenum-gold concentrations in the drill holes increase at depth.
The Pass zone (located 500m northwest of the Bornite zone) has been drill tested over a 1,000m horizontal distance and porphyry style copper mineralization was intersected in all drill holes. Molybdenum concentrations are highly variable and can reach 1,500ppm (0.15%) over narrow intervals. In general, the molybdenum-gold concentrations in the drill holes tend to increase at depth. The Camp zone is located 800m northwest of the Pass zone and the West zone is located an additional 1,000m northwest of the Camp zone. Limited drilling intersected porphyry style copper mineralization in these zones, the limits of which have not been delineated.
2021 Exploration Targets
A large, irregular Cu-Mo in soil geochemical anomaly (6,400m long by up to 2,000m wide) and an area of sporadic copper mineralization (3,000m by 2,000m) are located to the north and uphill from the mineralized drill holes in the Pass-Camp-West zones. The in soil geochemical anomaly and copper mineralization overlap each other and is the focus of the 2021 geophysical survey.
Preliminary Metallurgical Testwork
Two phases of lock-cycle and variability testwork were completed on the mineralization from the East, Bornite and Pass zones. The testwork yielded a clean, bulk cleaner copper-molybdenum concentrate that assayed 29.6% Cu, 2.72% Mo, 28.2 g/t Au, and 175.9 g/t Ag with recoveries of 89.9% Cu, 71.1% Mo, 78.6% Au, and 78.1% Ag to concentrate. The comminution tests yielded Bond Work Indices that ranged from 16.9 to 20.6 kWh/t (average 18.6 kWh/t) and Bond Abrasion Index ranged from 0.211 g to 0.554 g (average 0.381 g).
Other studies completed to date include specific gravity measurements on drill core, ML-ARD testwork, acid-base accounting (ABA), Paste pH measurements and Neutralization Potential (NP) estimations on mineralized and non-mineralized samples from the Pass, Bornite and East zones.
The historical information included in this news release is taken from Assessment Reports filed with the British Columbia Ministry of Mines, internal studies completed by former operators and NI 43-101 Technical Reports filed in 2017 and 2019. Threshold values for soil geochemical anomalies are 200 parts per million (ppm) for copper and 5ppm for molybdenum. The QP for this news release acted as a technical consultant and performed field work on this project between 2014 and 2018, the last year in which exploration activities were completed. This compilation and interpretation was formed by including, but not necessarily exclusive to, drilling, assaying and metallurgical testing that has not been verified by Copper Fox and should not be considered reliable until verified by Copper Fox.
Elmer B. Stewart, MSc. P. Geol., President and CEO of Copper Fox, is the Company’s non-independent, nominated Qualified Person pursuant to National Instrument 43-101, Standards for Disclosure for Mineral Projects, has reviewed the scientific and technical information disclosed in this news release.
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