VANCOUVER, British Columbia – October 15, 2019 – Silvercorp Metals Inc. (“Silvercorp” or the “Company”) (TSX / NYSE American: SVM) is pleased to report results of its exploration programs from April 1, 2018 to June 30, 2019 at the LMW mine, Ying Mining District, Henan Province, China. Exploration drilling is ongoing at the LMW mine and all other mines at the Ying Mining District.
During this period, Silvercorp continued its extensive exploration programs and completed 21,272 metres (“m”) of underground diamond drilling and 3,274m of exploration tunneling at the LMW mine. Results of underground drilling continuously extended the major mineralized vein structures along strike and downdip, and exploration tunneling exposed high-grade mineralization zones within major production vein structures.
Highlights of selected drill hole intersections:
- Hole ZKX11111 intersected a 1.34m interval from 135.86m to 137.20m, 0.97m true width, of vein LM17W1 grading 1,211 grams per tonne (“g/t”) silver (“Ag”), 11.58% lead (“Pb”), and 0.92% zinc (“Zn”) at the 634m elevation;
- Hole ZKX1302 intersected a 1.22m interval from 121.20m to 122.42m, 1.21m true width, of a new vein grading 661g/t Ag, 14.00% Pb, and 0.28% Zn at the 708m elevation; and
- Hole ZKX0513 intersected a 1.66m interval from 185.43m to 187.09m, 1.36m true width, of vein LM17W grading 859g/t Ag, 4.53% Pb, and 0.31% Zn at the 661m elevation.
The underground drilling program is being conducted with three underground rigs from the current production levels to delineate the downdip and along-strike extensions of known mineralized vein structures in the production area and test for new veins in the previously less-explored areas.
The drilling program from April 1, 2018 to June 30, 2019 at the LMW mine is briefly summarized in the following table:
Highlights of selected mineralization zones exposed in exploration drift tunnels:
- Drift Tunnel PD969-LM12E-969-9NYM exposed mineralization 52m long and 0.54m wide (true width) grading 958g/t Ag, 2.77% Pb, and 0.22% Zn within vein structure LM12E on the 969m level;
- Drift Tunnel PD969Shaft-LM32-600-116SYM Extension exposed mineralization 83m long and 0.32m wide (true width) grading 896g/t Ag, 3.31% Pb, and 0.71% Zn within vein structure LM32 on the 700m level; and
- Drift Tunnel XPDS-LM16-725-117NYM exposed mineralization 110.5m long and 0.85m wide (true width) grading 517g/t Ag, 2.72% Pb, and 0.39% Zn within vein structure LM16 on the 725m level.
The exploration tunneling, comprising drifting, crosscutting and raising, was driven along and across major mineralized vein structures to upgrade drill defined mineral resources and test for new parallel and splay structures. Exploration tunneling in the 2018-2019 exploration program at LMW has been mainly conducted between elevation levels 550m and 969m.
The tunneling program from April 1, 2018 to June 30, 2019 at the LMW mine is briefly summarized in the following table:
Tables 1 and 2 below list the assay results of selected mineralized intersections in drill holes and mineralized zones exposed in drift tunnels in the exploration programs from April 1, 2018 to June 30, 2019.
Drill cores are NQ size. Drill core samples, limited by apparent mineralization contact or shear/alteration contact, were split into halves by saw cutting. The half cores are stored in the Company’s core shacks for future reference and checking, and the other half core samples are shipped in security-sealed bags to the Chengde Huakan 514 Geology and Minerals Test and Research Institute in Chengde, Hebei Province, China, 226km northeast of Beijing, and the Zhengzhou Nonferrous Exploration Institute Lab in Zhengzhou, Henan Province, China. Both 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 with continuous chisel chipping. Sample length ranges from 0.2m to more than 1m, 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 lab batch of 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 about 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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