Silvercorp Intersects Vein LM7 with 19.67 Metres True Width Grading 261 Grams Per Tonne Silver, 1.1% Lead, and 0.78% Copper at the LMW Mine, Ying Mining District, China
VANCOUVER, British Columbia – May 25, 2021 – Silvercorp Metals Inc. ("Silvercorp" or the “Company”) (TSX/NYSE American: SVM) is pleased to report wide and high-grade intercepts from its 2021 exploration program at the LMW mine, Ying Mining District, Henan Province, China. Extensive exploration drilling and tunnelling are ongoing at the LMW mine and all other mines at the Ying Mining District.
The drilling program from October 1, 2020 to May 1, 2021 at the LMW mine has been focused on in-fill drilling target areas of known silver-lead-zinc veins that were believed to be uneconomic based on limited prior drilling and tunneling. Currently, ten rigs are drilling at the LMW mine and a total of 116 diamond drill holes, including 100 underground holes and 16 surface holes totaling 22,890 metres (“m”) have been completed.Assay results for 101 holes have been received with 53 holes intercepting many zones of high-grade silver-lead mineralization and gold mineralization, including veins LM7, LM7E, LM8, LM8_1, LM12, LM12_1, LM13, LM13W, LM16W1, LM17, LM17E, LM19, LM19Wa, LM41E, LM41E1, and LM50.
Wide Intercepts of Vein LM7
Four in-fill drill holes, together with cross-cut tunnels and previously intercepted drill holes, have defined a block of vein LM7 showing wide intercepts trace along a strike length of 320 m near the development tunnels at the 600 m level.Currently, three rigs are drilling this discovery:
- Hole ZKX0575 intersected a 20.75 m interval (19.67 m true width) of vein LM7 grading 261 grams per tonne (“g/t”) silver (“Ag”), 1.08% lead (“Pb”), 0.04% zinc (“Zn”), 0.16 g/t gold (“Au”), and 0.78% copper (“Cu”), which includes an 8.43 m interval (8.0 m true width) grading 532 g/t Ag, 2.20% Pb, 0.07% Zn, 0.31 g/t Au, and 1.62% Cu;
- Hole ZKX0530 intersected a 25.58 m interval (23.96 m true width) of vein LM7 grading 202 g/t Ag, 1.26% Pb, 0.12% Zn, 0.15 g/t Au, and 0.37% Cu, including 3.98 m interval (3.73 m true width) grading 818 g/t Ag, 2.9% Pb, 0.05% Zn, 0.23 g/t Au, and 0.46% Cu;
- Hole ZKX0751 intersected a 20.03 m interval (19.32 m true width) of vein LM7 grading 162 g/t Ag, 1.38% Pb, 0.11% Zn, 0.09 g/t Au, and 1.00% Cu; and
- Hole ZKX0732 intersected a 16.93 m interval (16.16 m true width) of vein LM7 grading 112 g/t Ag, 2.00% Pb, 0.13% Zn, 0.09g/t Au, and 0.79% Cu.
Confirmation of Vein W1
Drilling and drift tunnels have further demonstrated continuity of the near north-south extending W1 and northwestern striking W6, W6E1, W6E2, W6W, and W18 veins, with high-grade silver-lead mineralization intercepts at 800 m to 950 m elevation in the northwestern part of the LMW mine. The discoveries are expected to expand the resources in this area.
Highlights of selected drill hole intercepts:
- Hole ZKX0429 intersected a 1.51 m interval (1.50 m true width) of vein W1 grading 1,103 g/t Ag, 1.46% Pb, 0.10% Zn, 0.05 g/t Au, and 0.65% Cu, which includes a 0.79 m interval (0.77 m true width) grading 2,078 g/t Ag, 0.41% Pb, 0.11% Zn, 0.09 g/t Au, and 1.22% Cu; and
- Hole ZKX0728 intersected a 1.17 m interval of vein W1 grading 1,072 g/t Ag, 1.52% Pb, 0.09% Zn, 0.15 g/t Au, and 0.08 Cu.
Ongoing Drilling of Sub-Horizontal Gold Zone at Vein LM50
As listed in Table 1 below, ten drill holes intercepted the sub-horizontal gold structures at LM50, with Hole ZKX0423 intersecting a 2.25 m interval (1.62 m true width) of vein LM50 grading 10.53 g/t Au.
In-fill Drilling of Other Veins
- Hole ZKX0383 intersected a 2.59 m interval (1.95 m true width) of vein LM13 grading 1,166 g/t Ag, 0.04% Pb, 0.06% Zn, 0.74 g/t Au, and 0.65% Cu, which includes a 1.37 m interval (1.03 m true width) grading 2,179 g/t Ag, 0.07% Pb, 0.10% Zn, 0.05 g/t Au, and 0.90% Cu;
- Hole ZKX0305_1 intersected a 6.44 m interval (2.67 m true width) of vein LM13W2 grading 386 g/t Ag, 1.82% Pb, 0.08% Zn, 0.07 g/t Au, and 0.80 g/t Cu; and
- Hole ZKX3811 intersected a 5.16 m interval (4.97 m true width) of vein LM17 grading 388 g/t Ag, 1.95% Pb, 0.09% Zn, 0.04 g/t Au, and 0.08% Cu, which includes a 1.80 m interval (0.99 m true width) of 833 g/t Ag, 3.11%Pb, 0.10% Zn, 0.06 g/t Au, and 0.19% Cu.
In addition, a total of 3,352 m of exploration tunnels have been developed at the LMW mine during the period. These exploration tunnels (including 2,434 m of drifts) were driven along and across major mineralized vein structures to upgrade the drill defined mineral resources and test for new parallel and splay structures, and are summarized as follows:
Highlights of selected mineralized zones exposed in the drift tunnels:
- Drift Tunnel XPDN-LM17-800-9SYM exposed mineralization 15 m long and 1.38 m wide (true width) grading 1,460 g/t Ag, 11.36% Pb, 0.87% Zn, 0.02 g/t Au, and 0.22% Cu within vein LM17;
- Drift Tunnel XPDS-LM17-575-26SYM exposed mineralization 40 m long and 1.54 m wide (true width) grading 708 g/t Ag, 4.57% Pb, 0.40% Zn, 0.26 g/t Au and 0.47% Cu within vein LM17; and
- Drift Tunnel PD918-W1-918-4SYM exposed mineralization 15 m long and 0.85 m wide (true width) grading 1,561 g/t Ag, 4.31% Pb, 0.62% Zn, 0.02 g/t Au, and 0.45% Cu within vein W1.
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, 226km northeast of Beijing, the Zhengzhou Nonferrous Exploration Institute Lab in Zhengzhou, Henan Province, China, and SGS-CSTC Standards Technical Services (Tianjin) Co., Ltd., Tianjin, China. All the three labs are ISO9000 certified analytical labs. For analysis, the sample is dried and crushed to minus 1mm and then split to 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 1.0 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 1mm is made and kept in the laboratory archives. Gold is analysed by fire assay with AAS finish, and 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 CRM, 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.