Results Include Copper Equivalent Grades Exceeding 14% Copper over Intersections of up to 7.3 Metres
Trilogy Metals Inc. (TSX: TMQ) (NYSE American: TMQ) is pleased to announce the third set of drilling results from the 2022 field season at the Upper Kobuk Mineral Projects located in northwestern Alaska.
The UKMP includes the Arctic deposit, the Bornite (carbonate-hosted copper) deposit, and prospective mining claims in the surrounding area. The drill program was completed by Ambler Metals LLC the joint venture operating company equally owned by Trilogy and a wholly-owned subsidiary of South32 Limited (ASX, LSE) (JSE: S32) (ADR: SOUHY).
The 2022 field program included 10,738 meters of diamond drilling, of which 8,376 meters was drilled at Arctic, the most ever drilled at Arctic in a single field season, while the remainder of the meterage was used on regional exploration targets in the Ambler VMS Belt and near Bornite. The 2022 field program prioritized advancing Arctic with additional infill drilling to further improve the confidence in the mineral resource and for geotechnical studies to further de-risk the project.
The first and second sets of assay results from the 2022 drill program are available in Trilogy’s news releases dated November 29, 2022 and January 25, 2023, posted on the Company’s website at https://trilogymetals.com/news-and-media/news/.
This release covers an additional 17 holes comprising 15 infill and two geotechnical. The infill holes were drilled in the eastern and northern parts of the deposit that will be mined early in the mine life, where previous drill holes were more widely spaced and the deposit less well defined (see Figure 1).
Significant intersections of high-grade copper, zinc, lead, gold, and silver mineralization include:
True widths have not been determined for the above intercepts but are thought to be 80% to 100% of actual drill thicknesses, except intercepts in hole AR22-0218 which are estimated at 78% of actual drill thickness.
Tony Giardini, President and CEO of Trilogy, commented, “These results serve to reinforce our conviction that the Arctic deposit stands out as one of the most exceptional polymetallic mineral projects worldwide in terms of grade. The latest infill and geotechnical holes continue to demonstrate very high grades of polymetallic metals over impressive widths in the shallowest parts of the deposit. I am looking forward to seeing the remaining assays from drill holes from the 2022 field season.”
Richard Gosse, Vice President, Exploration at Trilogy, stated, “This third set of results from the 2022 drill program at Arctic continues to largely confirm the grades and thicknesses predicted by the resource model within the 2022 reserve pit design. The results indicate mineralization is very continuous, especially in Zone 5 which typically contains higher grades and most consistent thicknesses at Arctic.”
Mineralized intervals of high-grade mineralization at a cut-off of 0.5% copper equivalent are reported in Table 1. The locations of the holes are shown in Figure 1 and Table 2. The drill holes are shown in cross sections in Figures 2, 3 and 4.
The drill results contained in this news release are from 17 drill holes from the 2022 Arctic drill program, which include 15 infill holes (AR22-0198, 0202, 0203, 0209, 0212, 0218, 0219, 0222, 0223, 0225, 0227, 0228, 0229, 0233 and 0236) and two geotechnical holes (AR22-0199 and 0235). All drill holes are sized HQ3 (63.5 mm diameter). The 2022 Arctic infill program was designed to increase confidence from Indicated to Measured in areas of the mineral resource block model that would be mined during the first years of production, with the highest estimated metal value, based on Trilogy’s mine plan reflected in the 2023 Arctic feasibility study1 and the Arctic Project S-K Technical Report Summary with an effective date of November 30, 2022.
Geotechnical holes AR22-0199 and 0235 were drilled to further define the talc horizon in the eastern pit wall. Hole AR22-0235, 270 meters from the closest existing hole and outside the 2022 pit boundary, intersected a narrow zone of copper-zinc mineralization. The mineralization is thought to be an extension of Zones 1 or 5 that appear to merge into a single horizon in the northern part of the deposit. Additional drilling in this area is warranted.
Within the Arctic deposit, mineralization occurs as stratiform semi-massive sulphide to massive sulphide beds within primarily graphitic to chloritic schists and fine-grained quartz schists. Sulphide mineralogy is similar for all intercepts: chalcopyrite, sphalerite and galena.
|1 Arctic Project, NI 43-101 Technical Report on Feasibility Study, Ambler Mining District, Alaska, with an effective date of January 20, 2023 and filed on February 14, 2023|
Table 1. Drill intercepts from the 2022 Arctic infill drilling program.
Figure 1. Location of Arctic drill holes from the UKMP drilling program.
Figure 2. Cross section showing holes AR22-0209, AR22-0212, AR22-0218, AR22-0229 and AR22-0236.
Figure 3. Cross section showing holes AR22-0202, AR22-0203 and AR22-0225.
Figure 4. Cross section showing holes AR22-0219, AR22-0222, AR22-0223 and AR22-0228.
Table 2. Drill hole locations at the Arctic Project.
Coordinates are in UTM Zone 4N (meters) coordinate system, NAD83 Datum.
The drilling program, sampling and assaying protocol, and data verification were managed by qualified persons (QPs) employed by Ambler Metals. The diamond drill holes were completed using HQ3 diameter core, and recoveries averaged 88.8%. Drill core was cut lengthwise into halves using a diamond saw, with one-half used for the assay sample and the other half retained in core boxes and archived at site.
Samples were collected through mineralized zones using a 0.30 m minimum length and 2.37 m maximum length; average sample length is 1.02m. Weights of the drill core samples range from 0.34 to 10.18kg, depending on the size of core, rock type, and recovery.
Each core sample was placed into a bag with a numbered tag and quality control samples were inserted between core samples using the same numbering sequence. Then, samples were grouped into batches for shipping and laboratory submissions. Each batch of 20 samples contains quality control (QC) samples that comprise one certified reference material (CRM), one core blank (BLK), and one crushed or pulp duplicate (DUP). In addition, 1 field duplicate was taken within mineralized intervals for every 20 samples. Chain of custody records are maintained for sample shipments and the custody is transferred from Ambler Metals expeditor to the laboratory upon delivery.
Samples were shipped to ALS Minerals laboratory in Fairbanks, Alaska, USA, for sample submission. ALS Minerals Fairbanks is a satellite sample preparation facility accredited under ALS Minerals. The ALS Minerals Fairbanks shipped the samples to ALS Minerals in North Vancouver, B.C., Canada, for sample preparation and analysis. ALS Minerals North Vancouver is an independent laboratory certified under ISO 9001:2008 and accredited under ISO/IEC 17025:2005 by the Standards Council of Canada. Selected sample batches were sent to ALS Minerals laboratory in Vientiane, Laos for fire assay. ALS Minerals includes its own internal quality control samples comprising certified reference materials, blanks, and pulp duplicates.
Drill core samples were weighed (WEI-21), dried if excessively wet (DRY-21), coarse jaw crushed to 70% passing 6 mm (CRU-21), fine jaw crushed to 70% passing 2 mm (CRU-31), riffle split to 250 g subsamples (SPL-21) and pulverized to 85% passing 75 μm (PUL-31). Crushed duplicates were created by riffle splitting crushed samples into two parts.
Gold analyses were completed using a 30 g lead fire assay and AAS finish (Au-AA23). Multi-element analyses for 48 elements were completed using a geochemical four acid digestion and ICP-ES/MS finish (ME-MS61). Over-range assays for Ag, Cu, Zn, and S were completed using an ore grade four-acid digestion and ICP-ES finish (ME-OG62). Additional analyses were completed for Ba and Hg.
Au, Ag, Cu, Pb, and Zn assays for QC samples were reviewed to ensure that CRMs are within tolerance limits specified on supplier certificates, BLKs are below acceptable thresholds, and DUPs display statistical patterns normally expected for sample types, methods, and elements. CRMs that returned assays outside of tolerance limits and BLKs with assays above thresholds were deemed to have failed. If failures were materially significant then sample batches containing the failed QC samples were re-assayed to ensure that the QC samples returned acceptable results before release. All QC monitoring data are reviewed and signed off by an independent QA/QC geologist.
There is no known relationship between core sample recoveries and assay grades. Ambler Metals will submit 5% of the assay intervals from prospective lithologies to a laboratory independent of ALS Minerals for check assaying.
Richard Gosse, P.Geo., Vice President, Exploration for Trilogy, is a Qualified Person as defined by National Instrument 43-101 and Regulation S-K 1300. Mr. Gosse has reviewed the scientific and technical information in this news release and approves the disclosure contained herein.
About Trilogy Metals
Trilogy Metals Inc. is a metal exploration and development company that holds a 50 percent interest in Ambler Metals LLC which has a 100 percent interest in the Upper Kobuk Mineral Projects in Northwestern Alaska. On December 19, 2019, South32, a globally diversified mining and metals company, exercised its option to form a 50/50 joint venture with Trilogy. The UKMP is located within the Ambler Mining District, one of the richest and most-prospective known copper-dominant districts in the world. It hosts world-class polymetallic volcanogenic massive sulphide deposits that contain copper, zinc, lead, gold and silver, and carbonate replacement deposits that have been found to host high-grade copper and cobalt mineralization. Exploration efforts have been focused on two deposits in the Ambler Mining District – the Arctic VMS deposit and the Bornite carbonate replacement deposit. Both deposits are located within a land package that spans approximately 190,929 hectares. Ambler Metals has an agreement with NANA Regional Corporation, Inc., an Alaska Native Corporation that provides a framework for the exploration and potential development of the Ambler Mining District in cooperation with local communities. Trilogy’s vision is to develop the Ambler Mining District into a premier North American copper producer while protecting and respecting subsistence livelihoods.
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