Silvercorp Intersects 1.35 Metres True Width Grading 2,532 Grams Per Tonne Silver and 14.38% Zinc from Vein S31 at the SGX Mine
VANCOUVER, British Columbia – January 24, 2022 – Silvercorp Metals Inc. (“Silvercorp” or the “Company”) (TSX: SVM) (NYSE American: SVM) is pleased to report additional high-grade intercepts from its 2021 exploration program at the SGX mine. Extensive exploration drilling and tunneling are ongoing at the SGX mine and all other mines in the Ying Mining District, Henan Province, China.
From July 1 to December 31, 2021, 52,634 metres (“m”) from a total of 327 diamond drill holes, including 272 underground holes and 55 surface holes, were completed at the SGX mine. Assay results for 209 holes have been received, with 102 holes intercepting mineralization. The Company also received assay results for 33 holes pending from the previous drilling program at the SGX mine from October 1, 2020 to June 30, 2021 disclosed in the Company’s news release dated July 6, 2021. Currently, there are 19 rigs drilling at the SGX mine.
The strategy of the drilling program is fourfold: 1) drill above or beneath the stopes that were previously mined but stopped due to more variation in grades, thickness and attitudes of the vein structures than previously modeled; 2) drill for silver-lead-zinc veins in the resource area at higher elevations closer to surface where there are limited drill holes from previous drilling programs; 3) drill for gold-silver veins in the resource area that were not prioritized in previous drilling programs; and 4) drill step-outs to the east of the resource area to confirm the continuity of the newly discovered gold-silver veins.
Drilling Above or Beneath Previously Mined Stopes and Near Surface Silver-Lead-Zinc Veins within the Resource Area
Most holes drilled during this period targeted blocks of known silver-lead-zinc veins in production areas that were previously missed due to limited drilling or tunneling, changes in the strikes and dips, and/or pinch-swelling of the pay-zones in the veins. The high-grade intercepts are mainly associated with the northwest-dipping S2 series, S6 series, S7 series, S8 series, S14 series, S18 series, S19 series, S21 series, east-dipping S31, S28, S29, and S32 veins, which have resulted in a significant amount of upgraded resources. Since access tunnels are already in place, any high-grade mineralization discovered can quickly be converted to reserves and mined.
Highlights of the high-grade silver-lead-zinc intercepts at the SGX mine:
- Hole ZK02AS6E1007 intersected a 3.19 m interval (1.35 m true width) of vein S31 grading 2,532 grams per tonne (“g/t’) silver (“Ag”), 0.69% lead (“Pb”), 14.38% zinc (“Zn”), 0.05 g/t gold (“Au”), and 0.12% copper (“Cu”) from 58.35 m depth, at an elevation of 372 m;
- Hole ZK12S7001 intersected a 2.02 m interval (1.65 m true width) of vein S7a1 grading 1,315 g/t Ag, 14.36% Pb, 0.84% Zn, 0.24 g/t Au, and 0.23% Cu from 161.50 m depth, at an elevation of 300 m;
- Hole ZK62S3101 intersected a 0.97 m interval (0.89 m true width) of vein S31 grading 1,764 g/t Ag, 36.49% Pb, 5.72% Zn, 0.13 g/t Au, and 0.27% Cu from 80.19 m depth, at an elevation of 239 m;
- Hole ZK04AS6E1002 intersected a 0.84 m interval (0.76 m true width) of vein S2 grading 2,497 g/t Ag, 29.05% Pb, 5.78% Zn, 0.12 g/t Au, and 0.23% Cu from 3.31 m depth, at an elevation of 353 m;
- Hole ZK50S2914 intersected a 1.22 m interval (0.88 m true width) of vein S29 grading 2,097 g/t Ag, 1.44% Pb, 20.61% Zn, 0.32 g/t Au, and 0.12% Cu from 218.16 m depth, at an elevation of 341 m; and
- Hole ZK04AS6E1005 intersected a 3.50 m interval (3.35 m true width) of vein S2 grading 291 g/t Ag, 7.41% Pb, 0.94% Zn, 0.12 g/t Au, and 0.04% Cu from 3.04 m depth, at an elevation of 354 m.
Drilling for Previous Low Priority Gold-Silver Veins within the Resource Area and Step-Out Drilling Intersecting Gold-Silver Veins 400 m to the East of the Resource Area
The drilling continued intersecting and extending the east dipping gold-silver S16 series, including S16W, S16W1, S16E, and S16E3. A total of 44 holes, including 38 holes from this period and six holes pending from the previous drilling program, targeted the S16 vein series. Together with the tunneling programs, the drill programs defined a mineralized block with a N-S strike length of 500 m, and a 150 m down-dip extension. Drilling was focused within the central portion of the block (300 m by 100 m), with drill hole spacing ranging between 15 m by 15 m and 25 m by 25 m. Assay results for 33 holes from the previous drilling program were returned, with 23 holes intersecting gold mineralization.
The Company’s No. 1 mill has been upgraded by installing a Knelson Gravity Concentrator to maximize gold-silver ore recovery from the SGX, HPG, LMW, and DCG mines.
Step-out drilling confirmed the continuity of the gold-silver bearing S11 and S11E veins, approximately 400 m east of the resource area. The S11 series gold-silver veins are sub-vertical and strike along a northeast-southwest trend.
Highlights of the gold silver intercepts at the SGX mine:
- Hole ZK68AS16W002 intersected a 5.38 m interval (5.36 m true width) of vein S16W grading 52 g/t Ag, 1.08% Pb, 0.39% Zn, 3.93 g/t Au, and 0.01% Cu from 37.67 m depth, at an elevation of 340 m;
- Hole ZK74S16W08 intersected a 1.74 m interval (1.58 m true width) of vein S16E3 grading 3 g/t Ag, 0.01% Pb, 0.01% Zn, 5.57 g/t Au, and 0.01% Cu from 92.90 m depth, at an elevation of 246 m; and
- Hole ZK66AS16W002 intersected a 1.33 m interval (1.30 m true width) of vein S16W grading 56 g/t Ag, 0.34% Pb, 0.72% Zn, 4.61 g/t Au, and 0.04% Cu from 67.13 m depth, at an elevation of 341 m.
Tunneling Programs at the SGX Mine
A total of 6,207 m of exploration tunnels were developed at the SGX mine during this period. The exploration tunneling, comprised of drifting, cross-cutting and raising, was driven along and across major mineralized vein structures to upgrade the drill-defined mineral resources, and to test for new parallel and splay structures (Tables 2 and 3).
Drill cores are NQ size. Drill core samples, limited by apparent mineralization contacts or shear/alteration contacts, were split into halves by saw cutting. The half cores are stored in the Company's core shacks for future reference and checks, and the other half core samples are shipped in securely sealed bags to the Chengde Huakan 514 Geology and Minerals Test and Research Institute in Chengde, Hebei Province, China, 226 km northeast of Beijing, the Zhengzhou Nonferrous Exploration Institute Lab in Zhengzhou, Henan Province, China, and SGS in Tianjin, China. All three labs are ISO9000 certified analytical labs. For analysis, the sample is dried and crushed to minus 1 mm and then split into a 200-300 g subsample which is further pulverized to minus 200 mesh. Two subsamples are prepared from the pulverized sample. One is digested with aqua regia for gold analysis with atomic absorption spectroscopy (“AAS”), and the other is digested with two-acids for analysis of silver, lead, zinc, and copper with AAS.
Channel samples are collected along sample lines perpendicular to the mineralized vein structure in exploration tunnels. Spacing between sampling lines is typically 5 m along strike. Both the mineralized vein and the altered wall rocks are cut by continuous chisel chipping. Sample length ranges from 0.2 m to more than 1 m, depending on the width of the mineralized vein and the mineralization type. Channel samples are prepared and assayed with AAS at Silvercorp’s mine laboratory (“Ying Lab”) located at the mill complex in Luoning County, Henan Province, China. The Ying lab is officially accredited by the Quality and Technology Monitoring Bureau of Henan Province and is qualified to provide analytical services. The channel samples are dried, crushed and pulverized. A 200 g sample of minus 160 mesh is prepared for assay. A duplicate sample of minus 1 mm is made and kept in the laboratory archives. Gold is analysed by fire assay with AAS finish, while silver, lead, zinc, and copper are assayed by two-acid digestion with AAS finish.
A routine quality assurance/quality control (“QA/QC”) procedure is adopted to monitor the analytical quality at each lab. Certified reference materials (CRMs), pulp duplicates and blanks are inserted into each batch of lab samples. QA/QC data at the lab are attached to the assay certificates for each batch of samples.
The Company maintains its own comprehensive QA/QC program to ensure best practices in sample preparation and analysis of the exploration samples. Project geologists regularly insert CRMs, field duplicates and blanks to each batch of 30 core samples to monitor the sample preparation and analysis procedures at the labs. The analytical quality of the labs is further evaluated with external checks by sending approximately 3-5% of the pulp samples to higher level labs to check for lab bias. Data from both the Company's and the labs' QA/QC programs are reviewed on a timely basis by project geologists.
Guoliang Ma, P. Geo., Manager of Exploration and Resource of the Company, is the Qualified Person for Silvercorp under NI 43-101 and has reviewed and given consent to the technical information contained in this news release.
Silvercorp is a profitable Canadian mining company producing silver, lead and zinc metals in concentrates from mines in China. The Company’s goal is to continuously create healthy returns to shareholders through efficient management, organic growth and the acquisition of profitable projects. Silvercorp balances profitability, social and environmental relationships, employees’ wellbeing, and sustainable development. For more information, please visit our website at www.silvercorp.ca.
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CAUTIONARY NOTE TO US INVESTORS
The disclosure in this news release and referred to herein was prepared in accordance with NI 43-101 which differs significantly from the requirements of the U.S. Securities and Exchange Commission (the "SEC"). The terms “proven mineral reserve”, “probable mineral reserve” and “mineral reserves” used in this news release are in reference to the mining terms defined in the Canadian Institute of Mining, Metallurgy and Petroleum Standards (the “CIM Definition Standards”), which definitions have been adopted by NI 43-101. Accordingly, information contained in this news release providing descriptions of our mineral deposits in accordance with NI 43-101 may not be comparable to similar information made public by other U.S. companies subject to the United States federal securities laws and the rules and regulations thereunder.
Investors are cautioned not to assume that any part or all of mineral resources will ever be converted into reserves. Pursuant to CIM Definition Standards, “Inferred mineral resources” are that part of a mineral resource for which quantity and grade or quality are estimated on the basis of limited geological evidence and sampling. Such geological evidence is sufficient to imply but not verify geological and grade or quality continuity. An inferred mineral resource has a lower level of confidence than that applying to an indicated mineral resource and must not be converted to a mineral reserve. However, it is reasonably expected that the majority of inferred mineral resources could be upgraded to indicated mineral resources with continued exploration. Under Canadian rules, estimates of inferred mineral resources may not form the basis of feasibility or pre-feasibility studies, except in rare cases. Investors are cautioned not to assume that all or any part of an inferred mineral resource is economically or legally mineable. Disclosure of “contained ounces” in a resource is permitted disclosure under Canadian regulations; however, the SEC normally only permits issuers to report mineralization that does not constitute “reserves” by SEC standards as in place tonnage and grade without reference to unit measures.
Canadian standards, including the CIM Definition Standards and NI 43-101, differ significantly from standards in the SEC Industry Guide 7. Effective February 25, 2019, the SEC adopted new mining disclosure rules under subpart 1300 of Regulation S-K of the United States Securities Act of 1933, as amended (the “SEC Modernization Rules”), with compliance required for the first fiscal year beginning on or after January 1, 2021. The SEC Modernization Rules replace the historical property disclosure requirements included in SEC Industry Guide 7. As a result of the adoption of the SEC Modernization Rules, the SEC now recognizes estimates of “Measured Mineral Resources”, “Indicated Mineral Resources” and “Inferred Mineral Resources”. In addition, the SEC has amended its definitions of “Proven Mineral Reserves” and “Probable Mineral Reserves” to be substantially similar to corresponding definitions under the CIM Definition Standards. During the period leading up to the compliance date of the SEC Modernization Rules, information regarding mineral resources or reserves contained or referenced in this news release may not be comparable to similar information made public by companies that report according to U.S. standards. While the SEC Modernization Rules are purported to be “substantially similar” to the CIM Definition Standards, readers are cautioned that there are differences between the SEC Modernization Rules and the CIM Definitions Standards. Accordingly, there is no assurance any mineral reserves or mineral resources that the Company may report as “proven mineral reserves”, “probable mineral reserves”, “measured mineral resources”, “indicated mineral resources” and “inferred mineral resources” under NI 43-101 would be the same had the Company prepared the reserve or resource estimates under the standards adopted under the SEC Modernization Rules.