Silvercorp Reports Intersection of 4.48 Meters True Width Grading 1,050 Grams Per Tonne Silver and 15.92% Lead at the Sgx Mine, Ying Mining District, China
VANCOUVER, British Columbia – August 15, 2017 – Silvercorp Metals Inc. (“Silvercorp” or the “Company”) (TSX:SVM / NYSE AMERICAN: SVM) is pleased to report the results of the first half of its 2017 exploration program at the SGX mine, Ying Mining District, Henan Province, China.
The 2017 exploration program at the SGX mine consists of underground drilling and tunneling. As of June 30, 2017, the Company completed 13,201 meters (“m”) of underground diamond drilling with 7 underground rigs and 10,531m of exploration tunneling. Results of the underground drilling and drift tunneling continuously extended the major mineralized vein structures along strike and downdip.
Highlights of selected intersections of drill holes:
- Hole ZK13AS7-1004 intersected a 5.85m interval from 78.36m to 84.21m, 4.48m true width, of vein S19W grading 1,050 grams per tonne (“g/t”) silver (“Ag”), 15.92% lead (“Pb”) and 0.55% zinc (“Zn”) at the 212m elevation, including an 1.22m interval from 81.91m to 83.13m, 0.93m true width grading 4,678g/t Ag, 63.12% Pb and 1.02% Zn;
- Hole ZK11AS7-1002 intersected a 0.90m interval from 78.88m to 79.78m, 0.78m true width, of vein S19 grading 2,017g/t Ag, 7.78% Pb and 1.30% Zn at the 243m elevation, and a 0.41m interval from 148.21m to 148.62m, 0.36m true width, of vein S7-1 grading 185g/t Ag, 36.63% Pb and 12.07% Zn at the 221m elevation; and
- Hole ZK15S18005 intersected an 1.29m interval from 119.40m to 120.69m, 1.02m true width, of vein S7-2 grading 1,049g/t Ag, 4.53% Pb and 3.12% Zn at the 221m elevation.
Highlights of selected mineralization zones exposed in exploration drift tunnels:
- Drift Tunnel PD16-S31-210-8NSYM exposed mineralization of 150m long and 0.86m wide (true width) grading 640 g/t Ag, 7.66% Pb and 2.08% Zn within vein structure S31 on the 210m level;
- Drift Tunnel XPD-S7-1-210-9NYM exposed mineralization of 100m long and 1.01m wide (true width) grading 455g/t Ag, 11.84% Pb and 3.25% Zn within vein structure S7-1 on the 210m level; and
- Drift Tunnel CM105-S2W2-300-74SNYM exposed mineralization of 60m long and 0.70m wide (true width) grading 609g/t Ag, 6.53% Pb and 2.79% Zn within vein structure S2W2 on the 300m level.
The 2017 underground drilling program is mainly conducted 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 previous less-explored areas.
The 2017 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
Tables 1 and 2 below list the assay results of some selected mineralized intersections in drill holes and mineralized zones exposed in drift tunnels in the first half of 2017 exploration program.
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, 226 km northeast of Beijing, and the Zhenzhou Nonferrous Exploration Institute Lab in Zhengzhou, Henan Province, China, and both labs are ISO9000 certified analytical lab. For analysis thesample 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 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 service. 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 at 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 the 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 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.
Ruijin Jiang, P. Geo, reviewed the exploration data and prepared the scientific and technical information regarding exploration results contained herein. Alex Zhang, P. Geo, VP exploration of the Company, is the Qualified Person on the project as defined under National Instrument 43-101 and he has verified and approved the contents of this news release.
Silvercorp is a low-cost silver-producing Canadian mining company with multiple mines in China. The Company’s vision is to deliver shareholder value by focusing on the acquisition of under developed projects with resource potential and the ability to grow organically. For more information, please visit our website at www.silvercorp.ca.
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Silvercorp Metals Inc.