VANCOUVER, British Columbia, Jan. 14, 2022 (GLOBE NEWSWIRE) — Interra Copper Corp. (CSE: IMCX) (OTCQB: IMIMF) (FRA: 3MX) (“Interra” or the “Company”) announces further Drilling Results from the Gully Area at its 20,600 hectare Thane Property, located on traditional territory of the Takla and Tsay Keh Dene First Nations in North-Central B.C.
Results are from drill holes TH21-7, TH21-8 and TH21-11 which tested the eastern portion of the Gully Zone’s IP chargeability anomaly along lines 4700N and 4600N respectively as well as the southern end of line 6350E. All three holes intersected indicator low grade copper-gold mineralization. Mineralization styles intersected within the drill holes consists of localized, structurally controlled, quartz-pyrite-chalcopyrite±arsenopyrite fractures, veins and rare semi-massive mineralization at shallow to moderate depths proximal to diorite-(quartz) monzonite and latite porphyry contacts and south-southwest to south-southeast trending moderate to steeply (40-80°) westerly dipping chloritic shears and dilational breccias. Significant mineralized intervals anomalous in some or all of Cu, Au, Ag, Mo include:
24.5 meters of indicator low grade copper-gold intercept from 70.0 m to 94.5 m, with an average grade of 0.13% Cu, 0.03 ppm gold, and 4.1 ppm molybdenum, and a CuEq of 0.15% CuEq.
TH21-8 contains two indicator style low grade copper-gold intercepts, 19.4 meters of 0.05% CuEq and 34.5m of 0.04% CuEq,
a low grade indicator style copper gold intercept, a 10.5m composite interval from 82.5 m to 93.0 m, grading 0.14% Cu, 0.07 ppm gold, 0.7 ppm silver and 5.5 ppm molybdenum.
See Table 1 for the chart format of these intercepts and CuEq calculation, and Figure 6 for Drill hole cross sections.
1 True widths of the reported mineralized intervals have not been determined.
2 Assumptions used in USD for the copper equivalent calculation were metal prices of $3.25/lb. Copper, $1,650/oz Gold, $20/oz Silver, and USD $40/ lb Molybdenum; Recovery is assumed to be 100% / even par given no current metallurgical testing at Thane to date. The following equation was used to calculate copper equivalence: CuEq = Copper (%) + (Gold (g/t) x 0.74) + (Silver (g/t) x 0.0090) + (Molybdenum (ppm) x 0.0006)
Drilling at the Gully Zone tested the depth potential of the following surface results:
- a 200 square meter IP chargeability high (up to 31 mV/V with a background of 10) within a highly K-spar and silica altered and resistive diorite to (quartz) monzonite and (quartz) syenite hosts;
- copper-gold outcrop mineralization of up to 3.13% Cu and 0.18 g/t Au within magnetic high and lows; and
- soil samples up to 1865 ppm Cu, 0.173 ppm Au, 0.8 ppm Ag and 29.2 ppm Mo.
A plan map and cross section of these holes with drill results are included below. See figure 4 for plan view of relevant drill holes, and figures 5 and 6 for section view of the drill holes illustrating the mineralized intercepts.
Interra’s goals at the Gully Zone in 2021 included;
- confirming and expanding copper and gold mineralization at depth from previous surface exploration programs;
- testing near surface chargeability and coincident resistivity highs targeted areas observed in the 2019 and 2020 IP programs and
- drilling angled holes across interpreted porphyry related alteration and associated mineralization and structural zones.
Interra’s results to date have confirmed;
- porphyry related K-spar and lessor albite alteration and structurally controlled quartz-sulphide vein style mineralization observed at depth at Gully zone;
- late phase tourmaline-quartz-pyrite veining (Figure 1, Table 2) and associated sericitic alteration potentially related to an overprinting upper alkalic-cap;
- Copper-gold mineralization is coincident with near surface high chargeability and K-spar-quartz±albite altered highly resistive areas observed in the 2019 and 2020 IP programs;
- sulphides of pyrite, chalcopyrite and localized molybdenite, arsenopyrite and bornite occur as quartz-sulphide veins and fractures (Figure 2, Table 2) and disseminations (Figure 3, Table 2), proximal to intrusive contacts, shear structures and within localized magnetite veins and breccias;
- copper and gold mineralization at depth is at reduced grades to samples collected from the surface, which may be due to secondary supergene enrichment of the surface samples;
- both sulphides and magnetite are noted to occur within areas of high chargeability
- mineralization and associated alteration within the reported intervals above are hosted within the Thane Creek diorite (207 and 194Ma), Duckling Creek (quartz) monzonite to (quartz) syenite (182 and 175Ma) and latite porphyry (162.2±2.6Ma) intrusive phases of the Hogem Batholith (Table 2);
- A Re-Os date of (202.8 +/-0.8Ma) from molybdenite within a quartz vein taken on a 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 (Table 2) and
- at least one phase of mineralization within the Cathedral and Gully zones may be related to a later intrusive phase within the batholith (Table 2).
Table 2: Summary of Intrusive Phases, Age, Observed Alteration and Mineralization within Hogem Batholith at the Cathedral and Gully Zones.
|Suite||Rock Type||Age (Ma)||Features||Alteration||Veining||Mineralization|
|Porphyry Sheets||Latite Porphyry||162.2 ±2.61||Porphyritic, 20-40% plag,10-15% hrnblnd-biotite w/n a K-feldspar rich groundmass||Weak localized potassic, Epidote and silicification||Qtz-Epi-Cal± sulphides; localized Mt-Act? and Epi-Prehnite||local disseminated as mafic replacement Associated with Qtz-Epi-Cal ± sulphides|
|Duckling Creek||(Quartz) Syenite||174.7±0.7 to 178.9±1.31||Fine grained to Pegmatitic, K-feldspar rich||Weak localized potassic, Epidote and silicification||Qtz-Epi-Cal± sulphides;||Local disseminated Associated with Qtz-Epi-Cal ± sulphides|
|Duckling Creek||(Quartz) Monzonite and Monzonite Porphyry||179.7±2.5 and 178.8±0.22||Equigranular, Fine to medium grained, K-feldspar rich Pyx-Hrnblnd-biotite
bearing; Porphyritic varieties contain large orthoclase Phenos.
Potassic-propylitic altered; possible Lithocap alteration related to tourmaline sericite+pyrite
|Qtz-Epi-Cal± sulphides; magnetite veins and breccias; Act±Qtz||Disseminated, mafic and magnetite replacement Associated with Qtz-Epi-Cal ± sulphides|
|Thane Creek||(Quartz) Monzodiorite||194±1.11||Equigranular, Medium to Coarse grained, Pyx-Hrnblnd-plag
Potassic-Sodic altered; possible Lithocap alteration related to tourmaline-sericite+pyrite
|Qtz-Epi-Cal± sulphides; magnetite veins and breccias; Act±Qtz and Qtz±chl± sulphides3||Disseminated, mafic and magnetite replacement Associated with Qtz-Epi-Cal ± sulphides|
|Gail Zone Quartz±sulphide Vein||202.8±0.83|
1. LA-ICPMS(Zircon) – Jones, G., Ootes, L., Milidragovic, D., Friedman, R., Camacho, A., Luo, Y., Vezinet, A., Pearson, D.G., and Schiarizza, P., 2021. Geochronology of northern Hogem batholith, Quesnel terrane, north-central British Columbia. In: Geological Fieldwork 2020, British Columbia Ministry of Energy, Mines and Low Carbon Innovation, British Columbia Geological Survey Paper 2021-01, pp. 37-56.
2. CA-TIMS(Zircon) – Devine, F.A.M., Chamberlain, C.M., Davies, A.G.S., Friedman, R., and Baxter, P., 2014. Geology and district-scale setting of tilted alkalic porphyry Cu-Au mineralization at the Lorraine deposit, British Columbia. Economic Geology, 109, 939-977.
3. ALS – Earth and Atmospheric Services Department of the University of Alberta, Re-Os isotopic and age data for molybdenite within a quartz-sulphide vein from outcrop sample #3288 within the Gail Zone at Interra Copper’s Thane Project in north-central British Columbia.
Additional soil sampling results have been received with results to be compiled and news released in the coming weeks.
The scientific and technical information disclosed in this news release was reviewed,…