Silvercorp Intersects 1.89 Metres Grading 37.08 Grams Per Tonne Gold in New Gold Zones at the LMW Mine, Ying Mining District, China
VANCOUVER, British Columbia – November 16, 2020 – Silvercorp Metals Inc. ("Silvercorp" or the “Company”) (TSX/NYSE American: SVM) is pleased to report the discovery of new gold zones and high grade intercepts from its 2020 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 2020 exploration program from July 1, 2019 to October 30, 2020 at the LMW mine has used in-fill drilling to target areas of known sub-vertical silver-lead-zinc veins that were previously believed to be uneconomic. Since June 2020, drilling has also targeted the gently-dipping zones believed to host gold mineralization, as reported in the May 28, 2020 news release. These gold zones were previously undiscovered and appear to have been over-printed by the sub-vertical silver-lead-zinc veins which are the focus of current mining operations. Currently, ten rigs are drilling at the LMW mine and a total of 132 diamond drill holes, including 108 underground holes and 24 surface holes totaling 37,869 metres (“m”) have been completed. Assay results for 125 holes have been received with 72 holes intercepting many zones of higher-grade silver-lead mineralization, including veins LM7, LM7W1, LM8, LM8_1, LM12_1, LM13, LM14, LM16, LM22, LM25W, LM41E, LM41E1, and LM41E2. Most of these higher-grade silver-lead discoveries can be mined through existing tunnels which is expected to substantially reduce tunnel development costs at the LMW mine going forward.
Drilling to test the gold-bearing sub-horizontal shear zone LM22 has intersected high gold grades, including 37.08 g/t Au over 1.89m. In addition, at least three new gently-dipping (to the west at less than 15°), stacked gold mineralization zones, namely LM50, LM51 and LM53, have been discovered in this drill campaign. The gold mineralization is associated with k-feldspar-ankerite-quartz-pyrite-galena veinlets and stockwork alteration. The most-drilled LM50 vein has been defined by drilling and underground tunnelling over 450m along strike to the northeast and 350m down-dip in a 25m to 50m grid pattern and true thicknesses ranging from 0.5m to over 5.4m. Three rigs are drilling LM50 which is open in all directions.
Highlights of selected drill hole intersections:
- Hole ZKX0535 intersected a 1.89m interval (1.66m true width) of vein LM22 grading 37.08 grams per tonne (“g/t”) gold (“Au”), 4 g/t silver (“Ag”), and 0.53% copper (“Cu”), which includes a 1.25m interval (1.10m true width) grading 55.80 g/t Au, 5 g/t Ag, and 0.56% Cu.
- Hole ZKX0723 intersected a 6.13m interval (4.89m true width) of vein LM50 grading 5.23 g/t Au, 30 g/t Ag, 0.21% lead (“Pb”), and 0.12% zinc (“Zn”), which includes a 1.58m interval (1.34m true width) grading 12.70 g/t Au, 19 g/t Ag, 0.10% Pb, and 0.12% Zn.
- Hole ZKX0527intersected a 2.34m interval (2.22m true width) of vein LM50 grading 8.51 g/t Au, and 16 g/t Ag, including a 1.22m interval (1.16m true width) grading 13.30 g/t Au, and 15 g/t Ag.
- Hole ZKX0725 intercepted a 2.45m interval grading 4.33 g/t Au of an unknown vein, approximately 50m above the LM50 zone.
- Hole ZKX0940 intersected a 1.63m interval (1.46m true width) of vein LM8_1 grading 1,984 g/t Ag, 3.86% Pb, 0.60% Zn, 0.07 g/t Au, and 0.49% Cu, which includes a 1.08m interval (0.97m true width) grading 2,985 g/t Ag, 5.26% Pb, 0.87% Zn, 0.10 g/t Au, and 0.73% Cu.
- Hole ZKX0934 intersected a 4.43m interval (2.50m true width) of vein LM12_1 grading 343 g/t Ag, 6.21% Pb, 1.16% Zn, and 0.17 g/t Au, which includes two intersections:
- A 1.24m interval (0.70m true width) grading 339 g/t Ag, 7.72% Pb, 0.28% Zn, and 0.17 g/t Au; and
- A 0.89m interval (0.50m true width) grading 1,185 g/t Ag, 17.46% Pb, 4.84% Zn, and 0.50 g/t Au.
- Hole ZKX0118 intersected a 1.81m interval (1.29m true width) of vein LM25W grading 1,715 g/t Ag, 1.53% Pb, 0.44% Zn, 0.44 g/t Au, and 0.30% Cu.
In addition, a total of 8,684m of exploration tunnels have been developed at the LMW mine during the period. These exploration tunnels (including 4,750m 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 in the following table:
Highlights of selected mineralized zones exposed in the drift tunnels:
- Drift Tunnel XPDS-LM17-575-26SYM2 exposed mineralization 25m long and 1.54m wide (true width) grading 894 g/t Ag, 9.35% Pb, 0.53% Zn, 0.17 g/t Au, and 1.16% Cu within vein structure LM17;
- Drift Tunnel XPDS-LM16-675-115SYM exposed mineralization 10m long and 0.59m wide (true width) grading 1,740 g/t Ag, 0.96% Pb and 0.36% Zn within vein structure LM16;
- Drift Tunnel PD1080-LM41E-1080-11NYM exposed mineralization 15m long and 0.74m wide (true width) grading 1,079 g/t Ag, 2.12% Pb, 0.15% Zn, 0.02 g/t Au, and 0.55% Cu within vein structure LM41E; and
- Drift Tunnel PD918-W6-880-128NYM exposed mineralization 35m long and 0.68m wide (true width) grading 603 g/t Ag, 4.91% Pb, 2.12% Zn, 0.02 g/t Au, and 0.13% Cu within vein structure W6.
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 200-300g 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 5m along strike. Both the mineralized vein and the altered wall rocks are cut by continuous chisel chipping. Sample length ranges from 0.2m to more than 1.0m, 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 200g 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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