Mr. Lon Shaver reports
SILVERCORP INTERSECTS VEIN LM5 WITH 0.91 METRES TRUE WIDTH GRADING 6,455 GRAMS PER TONNE SILVER AND 10 GRAMS PER TONNE GOLD AT THE LME MINE, YING MINING DISTRICT, CHINA
Silvercorp Metals Inc. has released results from its 2021 exploration programs at the LME mine. Extensive exploration drilling and tunnelling are continuing at the LME mine, and all other mines at the Ying mining district, Henan province, China.
From Oct. 1, 2020, to May 31, 2021, 17,752 metres from a total of 113 diamond drill holes, including 98 underground holes and 15 surface holes, were completed at the LME mine. Assay results for 102 holes have been received, with 52 holes intercepting mineralization. Currently, seven rigs are drilling at the LME mine.
Drilling intersects high-grade veins in and outside the resource areas
The diamond drilling programs at the LME mine targeted blocks of known silver-lead-zinc veins in the resource areas that were previously missed due to limited drilling or tunnelling, changes in the strikes and dips, and/or pinch swelling of the pay zones in the veins. Since access tunnels are already in place, any discovered high-grade blocks can quickly be converted to reserves and mined.
The high-grade intercepts for this period are associated with parallel veins LM5, LM5E, LM5E1, LM5E2, M5W and LM5W2. Other veins include LM4W, LM4W2 and LM6 and its parallel veins LM6E, LM6E2, LM6W and LM6W1.
Stepout drilling at the LME mine also hit high-grade silver-lead-zinc mineralization, including veins LM61 and LM66 to the south and vein ML18E to the north. Hole ZKG20AT1704 confirmed that the north-south-striking vein T17E at the TLP mine extended southward to the area between the TLP and LME mines. These discoveries confirm the potential of high-grade silver-lead mineralization, extending beyond the defined resource area of the LME mine.
Highlights of high-grade intercepts of veins LM5 and LM6 and their parallel veins at the LME mine:
- Hole
ZKL5202SC intersected a 0.92-metre interval (0.91 m true width) of vein LM5 grading 6,455 grams per tonne silver, 5.28 per cent lead, 1.19 per cent zinc, 10 g/t gold and 0.29 per cent copper at the 498 m elevation.
- Hole
ZKL51LM4E204 intersected a 0.76 m interval (0.68 m true width) of vein LM5E grading 1,538 g/t Ag, 5.65 per cent Pb, 1.89 per cent Zn, 0.73 g/t Au and 0.38 per cent Cu at the 573 m elevation.
- Hole
ZKL53LM4E208 intersected a 0.71 m interval (0.65 m true width) of vein LM5W2 grading 1,902 g/t Ag, 1.48 per cent Pb, 0.32 per cent Zn, 0.01 g/t Au and 0.48 per cent Cu at the 633 m elevation.
- Hole
ZKL5801SC intersected a 0.94 m interval (0.53 m true width) of vein LM6E2 grading 3,014 g/t Ag, 5.51 per cent Pb, 0.39 per cent Zn, 0.20 g/t Au and 0.11 per cent Cu at the 502 m elevation.
- Hole
ZKL53LM602 intersected a 0.65 m interval (0.64 m true width) of vein LM6W grading 1,596 g/t Ag, 2.06 per cent Pb, 0.63 per cent Zn, 0.05 g/t Au and 0.27 per cent Cu at the 680 m elevation.
- Hole
ZKLDB1712 intersected a 1.14 m interval (1.08 m true width) of vein LM61 grading 13.70 g/t Au, 19 g/t Ag, 0.51 per cent Pb, 0.08 per cent Zn and 0.01 per cent Cu at the 681 m elevation.
Infill drilling of subhorizontal gold zone LM4E2
During this period, 22 out of the 44 holes targeting the subhorizontal gold structures of LM4E2 intersected gold mineralization:
-
Hole
ZKL55LM4E203 intersected a 1.16 m interval (0.93 m true width) of vein LM4E2 grading 5.43 g/t Au and 70 g/t Ag at the 581 m elevation.
SELECTED INTERCEPTS FROM THE 2021 DRILL PROGRAMS AT THE LME MINE
Hole ID From To Interval True width Ag Pb Zn Au Cu
(m) (m) (m) (m) (g/t) (%) (%) (g/t) (%)
ZKG20AT1704 91.46 92.16 0.70 0.66 389 1.29 1.41 0.05 0.04
ZKL51ALM4E201 23.28 24.03 0.75 0.46 5 5.41 0.24 0.10 0.02
ZKL51ALM4E202 35.07 36.32 1.25 0.88 490 0.94 0.59 0.01 0.06
ZKL51ALM4E204 23.19 23.75 0.56 0.52 326 0.74 0.21 0.01 0.10
ZKL51ALM4E204 112.87 113.61 0.74 0.68 2,148 5.84 2.48 0.38 0.51
ZKL51ALM4E205 19.31 19.83 0.52 0.50 635 2.51 0.90 0.03 0.28
ZKL51BLM4E201 24.50 25.13 0.63 0.51 123 0.28 0.15 0.01 0.09
ZKL51LM4E202 32.06 33.26 1.20 0.75 290 0.85 0.32 0.01 0.07
ZKL51LM4E203 23.74 28.83 5.09 1.01 104 0.75 0.18 0.01 0.05
ZKL51LM4E204 99.51 102.96 3.45 1.02 772 1.84 0.93 0.03 0.24
ZKL51LM4E204 121.16 121.92 0.76 0.68 1,538 5.65 1.89 0.73 0.38
ZKL5201SC 26.42 27.09 0.67 0.56 199 0.84 0.29 0.04 0.03
ZKL5201SC 54.73 55.79 1.06 0.49 215 1.47 0.39 0.31 0.03
ZKL5202SC 21.50 22.42 0.92 0.91 6,455 5.28 1.19 10.00 0.29
ZKL5202SC 52.83 54.05 1.22 1.20 395 0.56 0.04 0.04 0.08
ZKL5202SC 63.30 63.92 0.62 0.92 345 1.30 0.10 0.05 0.04
ZKL5202Y 184.44 185.37 0.93 0.72 247 0.37 1.76 0.01 0.04
ZKL5203SC 29.80 31.04 1.24 0.98 149 0.28 0.09 0.39 0.03
ZKL5204SC 23.36 23.94 0.58 0.50 837 3.17 0.14 0.76 0.03
ZKL52LM6W01 22.76 23.32 0.56 0.30 200 0.48 2.05 0.03 0.06
ZKL53ALM4E201 62.51 63.60 1.09 0.47 14 0.21 0.18 2.13 0.04
ZKL53ALM4E202 72.92 74.02 1.10 0.95 14 0.22 0.21 1.22 0.01
ZKL53ALM4E202 79.18 79.79 0.61 0.53 1 0.03 0.01 2.66 0.01
ZKL53ALM4E202 281.67 283.34 1.67 0.52 204 0.64 0.36 0.46 0.03
ZKL53ALM4E202 314.97 316.25 1.28 0.79 138 0.02 0.03 0.01 0.01
ZKL53ALM4E203 163.55 164.51 0.96 0.77 104 0.27 0.46 0.01 0.16
ZKL53ALM4E204 89.14 90.64 1.50 1.18 26 0.75 0.21 3.23 0.03
ZKL53ALM4E204 157.88 159.62 1.74 0.79 177 3.33 2.25 0.06 0.05
ZKL53ALM4E205 54.15 55.52 1.37 1.05 3 0.04 0.02 2.30 0.01
ZKL53ALM4E207 82.72 83.55 0.83 0.65 2 0.04 0.00 2.50 0.01
ZKL53LM4E202 97.77 99.08 1.31 0.98 12 0.16 0.05 1.40 0.03
ZKL53LM4E202 132.69 134.22 1.53 1.14 2 0.02 0.01 1.62 0.01
ZKL53LM4E208 29.52 30.23 0.71 0.65 1,902 1.48 0.32 0.01 0.48
ZKL53LM602 23.73 24.84 1.11 1.09 341 0.16 0.13 0.05 0.35
ZKL53LM602 41.6 44.04 2.44 2.39 118 0.73 0.31 0.05 0.02
ZKL53LM602 73.36 74.01 0.65 0.64 1,596 2.06 0.63 0.05 0.27
ZKL53LM603 64.54 65.38 0.84 0.74 718 0.41 0.43 0.00 0.10
ZKL53LM603 108.98 110.56 1.58 1.38 432 0.92 0.38 0.00 0.04
ZKL53LM603 179.78 180.31 0.53 0.47 165 0.23 0.06 0.03 0.01
ZKL5403SC 4.12 8.19 4.07 2.90 280 0.45 0.23 0.28 0.02
ZKL5403SC 129.98 130.76 0.78 0.56 696 6.53 0.97 0.00 0.28
including 7.59 8.19 0.60 0.47 1,238 2.04 0.82 1.24 0.06
ZKL5404SC 44.52 45.39 0.87 0.76 239 0.24 0.11 0.05 0.02
ZKL54ALM6W01 2.95 3.38 0.43 0.30 454 1.44 0.14 0.15 0.05
ZKL54ALM6W01 38.78 40.26 1.48 0.53 256 0.14 0.16 0.06 0.07
ZKL54ALM6W01 129.54 130.08 0.54 0.39 29 0.08 0.05 1.59 0.01
ZKL55ALM4E203 38.41 39.04 0.63 0.45 186 1.40 0.20 0.83 0.52
ZKL55ALM4E204 28.84 29.73 0.89 0.78 65 0.47 0.48 1.41 0.03
ZKL55ALM4E204 33.78 35.77 1.99 0.88 9 0.16 0.12 1.73 0.01
ZKL55ALM4E204 50.26 51.65 1.39 1.22 154 0.83 0.63 0.24 0.03
ZKL55ALM4E205 27.18 29.25 2.07 0.83 24 0.18 0.12 1.17 0.02
ZKL55ALM4E205 50.88 51.42 0.54 0.43 828 0.53 0.23 0.04 0.06
ZKL55ALM4E207 76.91 77.88 0.97 0.58 108 0.32 0.25 1.28 0.02
ZKL55LM4E201 65.09 69.39 4.30 1.03 14 0.34 0.19 2.05 0.02
ZKL55LM4E202 84.70 85.92 1.22 1.00 27 0.67 0.21 1.98 0.02
ZKL55LM4E203 26.44 27.60 1.16 0.93 70 0.57 0.26 5.43 0.02
ZKL55LM4E203 78.30 79.10 0.80 0.63 2 0.35 0.00 1.51 0.01
ZKL55LM4E204 47.45 48.49 1.04 0.98 16 0.09 0.27 2.22 0.01
ZKL5601Y 297.12 298.02 0.90 0.83 177 1.56 0.48 0.04 0.01
ZKL5602Y 126.54 127.73 1.19 1.00 103 4.17 0.60 0.05 0.06
ZKL5602Y 152.39 153.64 1.25 1.05 37 3.74 0.39 0.05 0.05
ZKL57LM4E201 65.15 66.23 1.08 0.83 5 0.25 0.03 2.00 0.03
ZKL57LM4E204 46.03 47.56 1.53 0.91 14 0.30 0.36 1.20 0.02
ZKL57LM4E206 75.18 80.32 5.14 0.61 321 1.91 0.89 0.16 0.04
ZKL57LM601 89.62 90.96 1.34 1.32 311 0.73 0.31 0.05 0.05
ZKL57LM601 120.89 123.60 2.71 2.67 143 2.42 0.08 0.05 0.02
ZKL5801SC 4.9 5.84 0.94 0.53 3,014 5.51 0.39 0.20 0.11
ZKL5802SC 5.53 6.5 0.97 0.81 328 0.32 0.10 0.05 0.05
ZKL58ALM6E201 129.67 130.52 0.85 0.79 210 0.22 0.25 0.10 0.04
ZKL58ALM6E201 190.78 192.56 1.78 1.64 88 1.40 0.46 0.07 0.06
ZKL61B01 80.70 81.55 0.85 0.31 38 0.10 0.23 1.59 0.01
ZKL61E02 33.61 34.98 1.37 1.36 85 1.54 0.39 2.16 0.04
ZKL63ALM4E205 41.74 43.29 1.55 0.71 149 1.45 0.96 4.23 0.60
ZKL63ALM4E205 76.36 78.66 2.30 0.54 60 0.70 0.14 0.91 0.01
ZKL63LM4E206 39.03 40.11 1.08 0.74 2 0.04 0.02 1.95 0.01
ZKL64Y09 49.20 49.74 0.54 0.47 18 3.35 0.19 0.05 0.01
ZKL64Y10 36.31 36.81 0.50 0.43 19 3.30 0.15 0.01 0.01
ZKL64Y11 31.34 31.83 0.49 0.40 13 4.46 0.08 0.01 0.01
ZKL68Y01 107.42 107.92 0.50 0.38 392 2.31 0.21 0.03 0.02
ZKLDB1712 238.15 239.29 1.14 1.08 19 0.51 0.08 13.70 0.01
ZKLDB51LM4E202 0.89 2.00 1.11 1.10 156 0.12 0.06 0.01 0.09
ZKLDB56ALM4W01 264.50 265.30 0.80 0.79 397 0.58 0.12 0.10 0.04
ZKLDB57ALM503 380.87 382.80 1.93 1.81 2 0.01 0.01 2.01 0.01
Quality control
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, 226 kilometres 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 ISO (International Organization for Standardization) 9000-certified analytical labs. For analysis, the sample is dried and crushed to minus one millimetre and then split to a 200 to 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 (atomic absorption spectroscopy).
Channel samples are collected along sample lines perpendicular to the mineralized vein structure in exploration tunnels. Spacing between sampling lines is typically five 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 one mm is made and kept in the laboratory archives. Gold is analyzed 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 (certified reference materials), 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 to 5 per cent of the pulp samples to higher-level labs to check for lab bias. Data from both the company's and the labs' quality assurance/quality control programs are reviewed on a timely basis by project geologists.
Guoliang Ma, PGeo, manager of exploration and resource of the company, is the qualified person for Silvercorp under National Instrument 43-101 and has reviewed and given consent to the technical information contained in this news release.
About Silvercorp Metals Inc.
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.
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