2022 drilling at the Hushamu deposit ("Hushamu") of the North Island Copper and Gold Project (the "North Island Project") has continued to demonstrate potential to improve Mineral Resource grade and tonnage within the existing Hushamu pit design area
HU22-01, HU22-02 and HU22-05 each extended higher-grade mineralization into areas which are currently modelled to contain waste or lower-grade mineralized material
In addition, HU22-06 indicates mineralization continues into alteration previously interpreted as unmineralized, more than 200 m beyond the existing modelled pit shell boundary.
VANCOUVER, British Columbia, August 05, 2022--(BUSINESS WIRE)--Northisle Copper and Gold Inc. (TSX-V: NCX) ("Northisle" or the "Company") is pleased to announce assay results from its 2022 Spring drill program at Hushamu. These new results continue to affirm the interpretation that higher grade mineralization exists in under-drilled areas of the modelled pit at Hushamu. In addition, HU22-06 was continued in copper mineralization for at least 200 meters beyond the outline of the modelled pit shell.
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Table 1: Hushamu 2022 Significant Intercepts. Copper and gold equivalent calculations based on the following metal prices which were used in the Company’s 2021 PEA (as defined below) on the North Island Project: Cu = US$3.25/lb, Au = US$1,650/oz, Mo = US$10/lb, Re = $1,256/kg. Calculations assume 100% recovery; totals may not add due to rounding. Note on equivalent calculation: Copper equivalent is determined by calculating total contained metal value/ tonne, dividing by the copper price, and then dividing the resultant number of pounds of copper by 2204.6. Gold equivalent is determined by calculating total contained metal value/tonne, dividing by the gold price, and then multiplying the resultant number of troy ounces of gold by 31.103. (Graphic: Business Wire)
Robin Tolbert, Vice President Exploration of Northisle stated "Drilling at Hushamu during early 2022 continues to demonstrate the potential for improved grade and tonnage at Hushamu. In addition, we have demonstrated that historical visual interpretations of the alteration profile at Hushamu may have underestimated the overall size of the mineralized portion of the system."
Figure 1 shows the Company’s existing deposits as well as key exploration targets at the North Island Project. The Hushamu deposit forms the core of the technical report titled "North Island Copper and Gold Project Form 43-101F1 Technical Report Preliminary Economic Assessment" issued June 8, 2022, with an effective date of February 4, 2021 (the "2021 PEA").
Hushamu 2022 Drill Results
Northisle has now received the assay results of the six drill holes from its 2022 Spring drill program at Hushamu (HU22-01 to HU22-06), which has the objective of converting in-pit Inferred Mineral Resources to Indicated Mineral Resources ahead of the Company’s planned pre-feasibility study. The mineralization remains open to the northwest and southeast of the deposit, and based on results released today is interpreted to be open at depth significantly past previous modelling. Significant intercepts from the 2022 Spring drill holes can be found in Table 1 above.
Drill hole collar locations for the 2022 drilling at Hushamu can be found in Table 2, and the drill holes are shown in context in Figure 2 with key sections showing the 2021 PEA proposed final pit outline as well as the surface projection of the Hushamu Mineral Resource estimate.
The significance of the additional 2022 Spring infill holes at Hushamu are:
HU22-01 shows significant mineralization extends from hole H-12-03 along the base of the proposed pit bottom. This may add tonnes and maintain the mineral grades over a longer distance than previously estimated.
HU22-02 shows a thicker combined mineralized interval than holes EC-184 and H-12-09 on either side of it. An additional hole will be drilled in the gap between these two holes.
HU22-03 and HU22-04 were infill holes drilled to the south of the main mineralized zone. Both intersected leached altered zones with a few narrow copper intercepts >0.01% Cu.
HU22-05 was part of a two-hole program to fill in the gap between H-12-08 and H17-02 and test the extent below the planned pit bottom. This hole showed mineralization extends to this point but not to depth. An in-fill hole between this hole and H17-02 is required to test to the south of an interpreted fault along Section 5613600E.
HU22-06 indicates that mineralization extends significantly beyond the modelled outline of the 2021 PEA pit shell on Section 581000 E:
Historical drilling generally ends at the interpreted interface of CMG alteration and propylitic alteration.
XRF scanning of drill core in real time indicated that core contained copper below the previously interpreted bottom of CMG alteration, so drilling was continued.
Results suggest future drilling should continue to greater depth and may represent a significant extension of mineralization.
The spring drilling program continues to demonstrate the potential to improve tonnage and grade in an updated Mineral Resource estimate at Hushamu through both upgrading of existing blocks as well as extension of the overall orebody.
Figure 3 shows Section 580300E, where HU22-02 can be seen in the context of other drill holes.
Figure 4 shows HU22-01 on section 580500E in context of previous drill holes.
The drill hole structure log for H17-02 on Figure 5: Section 580700E indicates the presence of a fault zone from 307 m to 384 m, similar discontinuities in drill holes along UTM Easting 5613600E on other sections may explain the lower grades exhibited in these and other holes in this area. The objective of future additional drilling like HU21-04 on either side of these ’null’ holes is to increase the Mineral Resource in these and similar areas elsewhere in the deposit.
As Table 1 and Figure 6 indicates hole HU22-06 extended mineralization 1200 meters beyond the 2021 PEA modelled pit shell outline on Section 581000
Logging, Sampling, Assaying and Quality Control ("QA/QC") Procedures
The diamond drill core logging and sampling program was carried out under a rigorous quality assurance / quality control program using industry best practices. Drill intersections in this release are typically HQ to 100 m and NQ thereafter to the end of holes. After drilling, core was logged for geology, structure, and geotechnical characteristics utilizing Geospark© core logging software, then marked for sampling and photographed on site. The cores for analyses were marked for sampling based on geological intervals with individual samples 3 m or less in length. Drill core was cut lengthwise in half with a core saw. Half-core was sent for assays reported in this news release. Prior to cutting core for assay bulk density was also determined on site by taking 20 to 25 cm lengths of whole core of each lithology at 10 m intervals. The ends of these were then cut at right angle to the core axis, retaining all pieces to be returned to the core box for later sample cutting and analysis. The diameter of each core sampled for bulk density was measured at each end with digital calipers to 3 decimal places and recorded. The length of the core was measured on four sides at 90 degrees to each other, to 2 decimal places and recorded. The software averaged the lengths and diameters. The mass of the dry core was measured twice on an Ohaus© balance to 2 decimal places. If no discrepancy occurred the measurement was recorded. If there was a discrepancy the measuring was repeated until no discrepancy between 2 measurements occurred. The density was calculated using the formula Bulk Density = π times r² times h (where r is radius of core and h is length of core). Certified standard masses are used to calibrate the scale balance used for bulk density determinations. The balance in the core logging area was levelled on a large concrete block to avoid vibration, was leveled, and surrounded by a wooden partition to avoid wind affecting the balance. The measurements were recorded in Geospark© logging software and Bulk Density calculated to 2 decimal places. In compiling assays on sections, intervals of less than 0.1% Cu, if less than 10 metres continuous width, within larger intervals >0.1% Cu were considered internal waste and included in the reported assays. If the interval was 13 m or greater, these assays were excluded from the compilation. Likewise, any intervals >0.15 Cu less than 13 width outside any other assays > 0.1% Cu were considered external waste and not reported.
A total of 5% assay standards or blanks and 5% core duplicates are included in the sample stream as a quality control measure and are reviewed after analyses are received. Standards were obtained from WCM Minerals, Vancouver and CDN Minerals, Langley. Blanks were obtained from unmineralized course bagged limestone landscaping rock. Standards and blanks in 2022 drill results to date have been approved as acceptable. Duplicate data add to the long-term estimates of precision for assay data on the project and precision for drill results reported is deemed to be within acceptable levels. Samples were sent to the SGS Natural Resources Laboratory in Burnaby, BC where the samples were dried, then crushed to 75% passing 2 mm, then a 250 g split was pulverized to 85% passing 200 mesh size (75microns) pulps. Clean crush material was passed through the crusher and clean silica was pulverized between each sample. The pulps were analyzed for gold by fire assay fusion of 50 g of the 250 g split. Total gold content was determined by digesting the silver doré bead from the fusion and then analysing by ICP/AES (SGS Code GE_FAI51V5). All samples were also analyzed for 49 additional elements by taking a 0.25 g of the 250g split which was heated in HNO3, HClO4 and HF to fuming and taken to dryness. The residue was dissolved in HCl and then analyzed utilizing ICP-AES/ICP-MS (combining SGS Code GE_ICP40Q12 and GE_IMS40Q12). Some samples were also additionally analyzed more precisely for Rhenium and Germanium (SGS Code-GE_IMS90A50-C). SGS Canada Inc. is an independent, international ISO/IEC 17025:2005 accredited laboratory. The analytical results were verified with the application of industry standard Quality Control ("QA/QC") procedures.
Pulps and rejects of holes with significant assay intervals are stored at Western Mineral Storage. The remaining split core is indexed and stored at the Northisle logging and office facility in Port Hardy, BC.
Results in this news release are length weighted averages.
Robin Tolbert, P.Geo., Vice President Exploration of Northisle and a Qualified Person as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects ("NI 43-101"), has approved the scientific and technical disclosure contained in this news release.
Northisle Copper and Gold Inc. is a Vancouver-based company whose mission is to become a leading and sustainable mineral resource company for the future. Northisle owns the North Island Project, which is one of the most promising copper and gold porphyry deposits in Canada. The North Island Project is located near Port Hardy, British Columbia on a 33,149-hectare block of mineral titles 100% owned by Northisle stretching 50 kilometres northwest from the now closed Island Copper Mine operated by BHP Billiton. Northisle recently completed an updated preliminary economic assessment for the North Island Project and is now focused on advancement of the project through a prefeasibility study while continuing exploration within this highly prospective land package.
For more information on Northisle please visit the Company’s website at www.northisle.ca.
Cautionary Note to Investors regarding Mineral Resources
The scientific and technical disclosure included in this press release has been prepared in accordance with NI 43-101 and the Canadian Institute of Mining, Metallurgy and Petroleum ("CIM") classification system. NI 43-101 is a rule developed by the Canadian securities Administrators that establishes standards for all public disclosure an issuer makes of scientific and technical information concerning mineral projects. The capitalized terms "Mineral Resource", "Inferred Mineral Resources" and "Indicated Mineral Resources" and the term "pre-feasibility study" used herein are defined in accordance with NI 43-101 and the CIM Definition Standards on Mineral Resources and Mineral Reserves adopted by CIM council, as amended. Inferred Mineral Resources involve a great amount of uncertainty as to their existence and do not have demonstrated economic viability. It cannot be assumed that all or any part of an Inferred Mineral Resource will ever be upgraded to a higher category.
Cautionary Statements regarding Forward-Looking Information
Certain statements contained in this news release constitute "forward-looking information" within the meaning of applicable securities law (collectively, "forward-looking statements"). Any statements that are contained in this news release that are not statements of historical fact may be deemed to be forward-looking statements. Forward-looking statements are often identified by terms such as "may", "should", "anticipate", "expect", "intend" and similar expressions. Forward-looking statements in this news release include, but are not limited to, statements relating to the existence of undiscovered, higher grade mineralization and tonnage in the Hushamu deposit; the extension of mineralization zones significantly beyond those outlined in previous modelling, if at all; the Company’s planned pre-feasibility study; the upgrade of Inferred Mineral Resources to Inferred Mineral Resources in advance of the pre-feasibility study, if at all; anticipated 2022 activities; the Company’s plans for advancement of the North Island Project; and expectations regarding the Company’s exploration activities. Forward-looking statements necessarily involve known and unknown risks, including, without limitation, Northisle’s ability to implement its business strategies; risks associated with mineral exploration and production; risks associated with general economic conditions; adverse industry events; stakeholder engagement; marketing and transportation costs; loss of markets; volatility of commodity prices; inability to access sufficient capital from internal and external sources, and/or inability to access sufficient capital on favourable terms; industry and government regulation; changes in legislation, income tax and regulatory matters; competition; currency and interest rate fluctuations; and other risks identified from time to time in the disclosure documents filed under the Company’s SEDAR profile at www.sedar.com. Readers are cautioned that the foregoing list is not exhaustive.
Readers are further cautioned not to place undue reliance on forward-looking statements as there can be no assurance that the plans, intentions, assumptions or expectations upon which they are placed will occur. Such information, although considered reasonable by management at the time of preparation, may prove to be incorrect and actual results may differ materially from those anticipated. Forward-looking statements contained in this news release are expressly qualified by this cautionary statement.
The forward-looking statements contained in this news release represent the expectations of management of Northisle as of the date of this news release, and, accordingly, are subject to change after such date. Northisle does not undertake any obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as expressly required by applicable securities law.
Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release.
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On behalf of Northisle Copper and Gold Inc.