Silvercorp Reports High-Grade Mineralization Zones Revealed By Its 2016 Exploration Tunneling At The Sgx Mine, Ying Mining District, China
VANCOUVER, British Columbia - January 23, 2017 - Silvercorp Metals Inc. ("Silvercorp” or the “Company”) (TSX:SVM) is pleased to report the results of its 2016 exploration program at the SGX mine, Ying Mining District, Henan Province, China.
The Company completed 21,358 meters (“m”) underground diamond drilling and 21,886m exploration tunneling in 2016 at the SGX mine. Results of the underground drilling continuously extended the major mineralized vein structures along strike and downdip, and the 8,296m drift tunneling exposed a total of 3,348m of high-grade mineralized zones.
Highlights of selected mineralization zones exposed in exploration drift tunnels:
- Drift Tunnel CM105-S2W2-180-12ANYM exposed mineralization of 155m long and 1.09m wide (true width) grading 851 grams per tonne (“g/t”) silver (“Ag”), 14.59% lead (“Pb”) and 1.98% zinc (“Zn”) within vein structure S2W2 on the 180m level;
- Drift Tunnel CM105-S2W2-180-12ASYM exposed mineralization of 125m long and 0.80m wide (true width) grading 1,035g/t Ag, 17.60% Pb and 2.78% Zn within vein structure S2W2 on the 180m level; and
- Drift Tunnel PD700-S19-400-9ANYM exposed mineralization of 55m long and 0.81m wide (true width) grading 1,059g/t Ag, 7.21% Pb and 6.74% Zn within vein structure S19 on the 400m level.
Highlights of selected intersections of drill holes:
- Hole ZK05S1905 intersected a 2.85m interval from 168.94m to 171.79m, 1.48m true width, of vein S19 grading 571 g/t Ag, 19.16% Pb and 1.04% Zn at the 130m elevation; and
- Hole ZK14AS2W204 intersected an 1.08m interval from 91.98m to 93.06m, 0.64m true width, of vein S2 grading 959g/t Ag, 6.7% Pb and 1.38% Zn at the 236m elevation.
Underground diamond holes in the 2016 drilling program were mainly designed to delineate the downdip and along-strike extensions of known mineralized vein structures in the production area and test for new veins in the adjacent less-explored areas.
The 2016 drilling program at SGX is briefly summarized in the following table:
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 parallel and splay structures.
The 2016 tunneling program at SGX is briefly summarized in the following table:
Tables 1 and 2 below list the assay results of some selected mineralized zones exposed in drift tunnels and mineralized intersections in drill holes in the 2016 exploration program.
Table 1: Selected mineralized zones exposed by exploration tunneling at the SGX Mine in 2016
Table 2: Selected drilling results from the 2016 drilling program at the SGX Mine
*Stepout: intersections adjacent to existing resource blocks for resource expansion;
**Test: intersections in open areas without known mineralized intersections nearby
The exploration results ending June 30, 2016 will be incorporated in a NI43-101 resource update report expected to be announced in the first quarter of 2017.
The Company has proposed a comprehensive exploration program comprising 23,722m tunneling and 22,819m underground drilling for SGX in 2017 to further trace the striking and downdip extensions of known vein structures and expand and upgrade the previously defined mineral resources. The 2017 exploration at the SGX mine will be mainly focused in the current production area and its adjacent less- or non-explored potential areas.
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 Testing 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.
For further information
Vice President, Corporate Development
Silvercorp Metals Inc.
Silvercorp Metals Inc.
Gordon Neal, Vice President, Corporate Development
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