Mr. Guoliang Ma reports
SILVERCORP INTERSECTS 7.6 METRES TRUE WIDTH GRADING 705 GRAMS PER TONNE SILVER AND 1.51% LEAD FROM VEIN LM7W AT THE LMW MINE
Silvercorp Metals Inc. has released results of thick and high-grade intercepts from its 2021 exploration program at the LMW mine. Extensive exploration drilling and tunnelling are continuing at the LMW mine and all other mines in the Ying mining district, Henan province, China.
From May 1 to Sept. 30, 2021, 23,908 metres a total of 166 diamond drill holes, including 152 underground holes and 14 surface holes, were completed at the LMW mine. Assay results for 102 holes have been received, with 70 holes intercepting mineralization. Currently there are 12 rigs drilling at the LMW mine.
The strategy of the drilling program is threefold: (1) drill above or beneath the stopes that were previously mined but stopped due to poor understanding of the geology, such as veins LM7 and LM7W, where much thicker pods have been discovered by infill drilling; (2) drill for high-grade silver-lead-zinc veins at the northwest and east sides of the resource area with previous limited drilling without follow-up such as W1, W2, W6 and LM41E series veins where high-grade intercepts were discovered and can quickly be mined; and (3) drill low-angle gold veins such as LM50, copper-gold-silver veins such as LM26 and gold-silver-copper veins such as LM22.
Drilling intersected high-grade silver-lead-zinc veins at the northwest and east sides of the resource area
At the northwest side of the resource area, drilling intersected high-grade silver-lead-zinc veins W1, W2, W6 and W6E1 with true widths up to 4.67 m, at an elevation above 850 m. The drilling program discovered new splay and parallel veins, including W1E, W2E, W2W, W6W and W18E. Vein W1 has been defined approximately 200 m along strike and 100 m downdip and is still open laterally along strike and at depth.
At the east side of the resource area, between the LMW mine and the LME mine, drilling intersected high-grade silver-lead-zinc vein LM41E, at an elevation above 760 m. Drilling also intersected additional splay and parallel silver-lead-zinc veins LM41E1 and LM41E1Wa, which are also high-grade vein structures with true widths up to 7.03 m.
Drill above or beneath the stopes that were previously mined
Most holes in this period targeted blocks of known silver-lead-zinc veins in the production 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. The high-grade intercepts are mainly associated with the northeast-striking LM7 series and LM12 series and the northwest-striking LM8 series and LM19 series. Drilling discovered additional splay and parallel vein structures LM12-2a and T1; the latter may be a southwest extension of the major vein structure T1 at the TLP mine to the northeast of the LMW mine.
Highlights of the high-grade silver-lead-zinc mineralization at the LMW mine:
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Hole ZKX05X023 intersected an 8.87-metre interval (7.60 m true width) of vein LM7W grading 705 grams per tonne silver, 1.51 per cent lead, 0.08 per cent zinc, 0.06 g/t gold and 0.05 per cent copper from 24.73 m depth, at an elevation of 790 m.
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Hole ZKX1137 intersected a 5.16 m interval (4.80 m true width) of vein LM41E1 grading 984 g/t Ag, 1.19 per cent Pb, 0.29 per cent Zn, 0.08 g/t Au and 1.15 per cent Cu from 46.4 m depth, at an elevation of 793 m.
- Hole ZKX0451 intersected a 3.11 m interval (1.72 m true width) of vein W1 grading 1,468 g/t Ag, 4.90 per cent Pb, 0.97 per cent Zn, 0.03 g/t Au and 0.35 per cent Cu from 137.88 m depth, at an elevation of 981 m.
- Hole ZKX05X037 intersected a 5.40 m interval (5.06 m true width) of vein LM8W grading 703 g/t Ag, 1.52 per cent Pb, 0.14 per cent Zn, 0.08 g/t Au and 0.42 per cent Cu from 24.97 m depth, at an elevation of 795 m.
- Hole
ZKX0789 intersected a 2.96 m interval (2.21 m true width) of vein LM7W grading 1,646 g/t Ag, 2.42 per cent Pb, 0.27 per cent Zn, 0.45 g/t Au and 0.17 per cent Cu from 15.96 m depth, at an elevation of 786 m.
- Drift tunnel PD918-W1-918-4SYM exposed mineralization 15 m long and 0.85 m wide (true width), grading 1,561 g/t Ag, 4.31 per cent Pb, 0.62 per cent Zn, 0.02 g/t Au and 0.45 per cent Cu of vein W1 at an elevation of 918 m.
- Drift tunnel PD918-W1-918-4NYM exposed mineralization 30 m long and 0.61 m wide (true width), grading 1,222 g/t Ag, 3.74 per cent Pb, 0.98 per cent Zn, 0.15 g/t Au and 0.34 per cent Cu of vein W1 at an elevation of 918 m.
Drill low-angle gold or copper-gold-silver veins
The drilling continued intersecting and extending the low-angle gold vein LM50. An additional 17 holes in this period targeted LM50 and defined a block 800 m east-west by 500 m north-south, with hole density at the central 300 m by 300 m portion being approximately 25 m by 25 m. Another 15 holes targeted the low-angle gold vein structure LM26. The assay results of 13 holes were returned with 10 holes intersecting gold mineralization.
Highlights of the intercepts from the low-angle gold veins at the LMW mine:
- Hole
ZKX0796 intersected a 3.47 m interval (2.74 m true width) of vein LM50 grading 11.82 g/t Au, 27 g/t Ag, 0.29 per cent Pb, 0.22 per cent Zn and 0.01 per cent Cu from 37.23 m depth, at an elevation of 786 m.
- Hole
ZKX0788 intersected a 2.47 m interval (1.99 m true width) of vein LM50 grading 1.26 g/t Au, 1,193 g/t Ag, 0.40 per cent Pb, 0.04 per cent Zn and 0.16 per cent Cu from 14.46 m depth, at an elevation of 789 m.
-
Hole
ZKX0787 intersected a 1.51 m interval (1.27 m true width) of vein LM26 grading 5.86 g/t Au, two g/t Ag, 0.01 per cent Pb, 0.02 per cent Zn and 0.01 per cent Cu from 80.04 m depth, at an elevation of 749 m.
- Hole
ZKX0153 intersected a 2.12 m interval (1.23 m true width) of vein LM26 grading 4.62 g/t Au, 19 g/t Ag and 0.75 per cent Cu from 63.11 m depth, at an elevation of 646 m.
- Hole
ZKX0172 intersected a 1.19 m interval (1.01 m true width) of vein LM26 grading 2.81 g/t Au, 132 g/t Ag and 4.05 per cent Cu from 60.95 m depth, at an elevation of 643 m.
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Drift tunnel PD924-LM22-834-5YMSS exposed mineralization 20 m long and 0.38 m thick (true thickness), grading 97 g/t Ag, 26.89 g/t Au and 12.93 per cent Cu of vein LM22 at an elevation of 834 m.
- Drift tunnel PD924-LM22-834-5YMSD exposed mineralization 10 m long and 0.39 m thick (true thickness), grading 54 g/t Ag, 38.95 g/t Au and 5.63 per cent Cu of vein LM22 at an elevation of 834 m.
SELECTED INTERCEPTS FROM THE DRILLING PROGRAM AT THE LMW MINE
Hole ID From To Interval True width Ag Pb Zn Au Cu
(m) (m) (m) (m) (g/t) (%) (%) (g/t) (%)
ZKX0153 63.11 65.23 2.12 1.23 19 0.08 0.01 4.62 0.75
ZKX0172 60.95 62.14 1.19 1.01 132 0.03 0.01 2.81 4.05
ZKX0173 1.35 2.33 0.98 0.49 196 6.26 1.45 0.03 0.39
ZKX0173 69.70 70.43 0.73 0.21 217 0.83 0.15 1.87 0.79
ZKX0346 66.05 66.55 0.50 0.46 322 2.45 0.13 0.03 0.04
ZKX0363 116.29 118.78 2.49 2.43 92 2.05 0.15 0.05 0.04
ZKX0390 18.68 19.52 0.84 0.63 57 3.89 0.14 0.05 0.04
ZKX0390 60.86 61.63 0.77 0.58 37 0.01 0.03 0.92 5.43
ZKX0391 60.94 61.51 0.57 0.48 9 0.56 0.07 3.15 2.36
ZKX0392 9.23 10.25 1.02 0.42 214 0.20 0.33 0.01 0.03
ZKX0393 16.81 17.64 0.83 0.56 25 5.36 0.02 0.01 0.01
ZKX0422 311.17 312.39 1.22 0.18 348 1.79 0.11 0.03 0.12
ZKX0433 119.75 120.26 0.51 0.41 1 0.00 0.01 2.82 0.01
ZKX0433 144.41 145.51 1.10 1.07 172 7.31 0.13 0.01 0.03
ZKX0434 114.94 116.86 1.92 1.81 639 3.30 0.55 0.04 0.06
ZKX0434 146.36 148.91 2.55 2.42 1,065 2.98 0.26 0.02 0.28
ZKX0435 158.30 159.28 0.98 0.78 238 0.51 0.45 0.03 0.02
ZKX0435 225.40 226.60 1.20 2.40 46 5.96 0.13 0.02 0.02
ZKX0442 136.75 139.86 3.11 2.88 543 4.21 1.19 0.03 0.11
ZKX0442 147.76 150.20 2.44 2.26 695 2.96 0.17 0.03 0.07
ZKX0447 154.85 156.05 1.20 0.79 4,034 4.67 0.73 0.05 0.46
ZKX0448 91.40 95.32 3.92 2.72 183 1.03 0.20 0.05 0.14
ZKX0451 61.86 62.83 0.97 0.54 376 5.78 0.13 0.03 0.04
ZKX0451 121.68 126.31 4.63 2.57 300 0.62 0.08 0.03 0.05
ZKX0451 137.88 140.99 3.11 1.72 1,468 4.90 0.97 0.03 0.35
incl. 138.72 139.90 1.18 0.65 3,572 12.55 2.40 0.03 0.88
ZKX0452 28.85 29.82 0.97 0.95 995 3.06 0.19 0.05 0.23
ZKX0452 136.42 141.17 4.75 4.67 123 0.66 0.16 0.05 0.03
ZKX0452 146.67 147.70 1.03 1.01 195 0.14 0.09 0.05 0.02
ZKX0452 163.80 164.40 0.60 0.59 309 1.04 0.10 0.05 0.02
ZKX0544 26.31 27.08 0.77 0.74 176 8.77 0.07 0.14 0.03
ZKX0578 82.30 83.44 1.14 1.13 230 0.72 0.10 0.33 0.21
ZKX0581 68.26 70.77 2.51 1.98 200 0.22 0.12 0.09 0.09
ZKX05X019 16.90 17.45 0.55 0.54 158 1.18 0.04 0.03 0.02
ZKX05X019 39.38 44.59 5.21 5.14 221 1.49 0.34 0.03 0.57
ZKX05X020 23.03 24.48 1.45 1.40 455 1.09 0.02 0.03 0.07
ZKX05X020 35.97 46.44 10.47 5.79 520 0.72 0.27 0.03 0.28
ZKX05X021 37.66 43.76 6.10 6.06 213 0.85 0.11 0.05 0.28
incl. 38.73 39.81 1.08 0.91 1,075 2.04 0.17 0.19 1.20
ZKX05X023 24.73 33.60 8.87 7.60 705 1.51 0.08 0.06 0.05
incl. 27.81 29.25 1.44 1.23 3,721 1.52 0.12 0.05 0.09
ZKX05X024 21.14 24.79 3.65 3.21 135 0.74 0.05 0.06 0.03
ZKX05X024 41.66 44.38 2.72 2.38 692 1.38 0.18 0.10 0.66
incl. 41.66 42.17 0.51 0.45 1,737 2.53 0.10 0.05 0.10
ZKX05X025 16.57 19.68 3.11 2.45 207 0.62 0.07 0.98 0.03
ZKX05X025 20.68 21.78 1.10 0.87 179 0.68 0.04 0.03 0.03
ZKX05X037 24.97 30.37 5.40 5.06 703 1.52 0.14 0.08 0.42
incl. 28.15 29.23 1.08 1.01 2,721 4.74 0.38 0.20 1.65
ZKX05X037 46.09 52.24 6.15 5.75 185 0.77 0.10 0.03 0.10
ZKX0628 34.81 35.62 0.81 0.80 422 1.44 4.71 0.03 0.13
ZKX0628 150.69 151.90 1.21 1.21 600 1.25 0.10 0.03 0.02
ZKX0629 65.51 67.72 2.21 1.90 743 1.64 1.35 0.05 0.00
incl. 65.51 66.38 0.87 0.75 1,175 4.10 3.38 0.05 0.29
ZKX0629 151.08 153.33 2.25 1.94 181 5.94 0.12 0.02 0.00
ZKX0742 157.08 159.59 2.51 2.50 544 1.00 0.41 0.05 0.15
ZKX0748 169.79 171.81 2.02 1.67 1,103 4.11 2.56 0.03 0.25
incl. 169.79 170.51 0.72 0.59 2,901 10.69 6.91 0.03 0.61
ZKX0754 85.20 88.81 3.61 3.16 120 1.15 0.07 0.10 0.88
ZKX0766 14.66 15.17 0.51 0.49 458 0.29 0.23 0.03 0.06
ZKX0771 4.65 6.01 1.36 1.33 453 0.52 0.19 0.01 0.04
ZKX0771 11.69 12.61 0.92 0.90 389 1.55 0.46 0.02 0.06
ZKX0771 41.17 42.66 1.49 1.46 93 1.81 0.12 0.02 0.03
ZKX0772 77.32 77.92 0.60 0.57 857 6.54 3.32 0.05 0.54
ZKX0787 40.84 45.87 5.03 4.22 173 0.56 0.05 0.05 0.03
ZKX0787 80.04 81.55 1.51 1.27 2 0.01 0.02 5.86 0.01
ZKX0788 14.46 16.93 2.47 1.99 1,193 0.40 0.04 1.26 0.16
incl. 15.8 16.93 1.13 0.91 1,963 0.03 0.03 2.65 0.29
ZKX0789 15.96 18.92 2.96 2.21 1,646 2.42 0.27 0.45 0.17
incl. 15.96 16.56 0.60 0.45 3,024 0.04 0.03 1.31 0.17
and 17.87 18.37 0.50 0.37 2,724 12.53 1.34 0.60 0.60
ZKX0789 54.29 62.20 7.91 5.91 122 1.69 0.17 0.44 0.07
ZKX0793 40.82 42.43 1.61 1.39 611 4.65 0.05 0.20 1.11
ZKX0796 1.53 2.11 0.58 0.46 511 0.58 0.03 0.05 0.07
ZKX0796 7.9 9.48 1.58 1.24 994 4.05 0.12 0.18 0.39
incl. 7.9 8.57 0.67 0.53 2,155 9.48 0.27 0.37 0.92
ZKX0796 31.07 31.65 0.58 0.46 271 0.64 0.27 0.17 0.13
ZKX0796 37.23 40.7 3.47 2.74 27 0.29 0.22 11.82 0.01
incl. 38.99 40.7 1.71 1.35 44 0.56 0.42 23.24 0.02
ZKX0982 6.95 7.75 0.80 0.60 391 1.35 0.19 0.03 0.05
ZKX0982 56.77 57.81 1.04 0.79 1,829 8.81 0.71 0.11 0.34
ZKX0983 43.22 51.51 8.29 7.03 347 3.86 0.20 0.06 0.13
incl. 48.48 49.29 0.81 0.69 2,955 35.65 1.07 0.29 0.66
ZKX0986 85.68 86.82 1.14 3.02 91 3.95 0.76 0.07 0.01
ZKX0987 44.43 52.46 8.03 3.57 649 1.96 0.32 0.19 0.48
incl. 47.73 49.30 1.57 0.70 2,000 5.07 0.85 0.53 0.37
ZKX09X004 50.69 51.95 1.26 1.22 56 5.59 0.08 0.03 0.01
ZKX09X004 57.42 60.39 2.97 2.89 391 3.18 0.15 0.03 0.17
incl. 59.36 60.39 1.03 1.00 980 8.00 0.31 0.03 0.39
ZKX09X005 46.00 46.56 0.56 0.40 323 4.49 0.13 0.03 0.08
ZKX1117 46.78 48.00 1.22 1.15 207 1.92 0.59 0.03 0.01
ZKX1117 115.92 117.35 1.43 1.35 298 0.68 0.04 0.02 0.05
ZKX1119 9.98 11.04 1.06 0.36 119 6.31 0.13 0.01 0.33
ZKX1137 37.61 39.36 1.75 1.63 295 2.50 0.20 0.04 0.09
ZKX1137 46.40 51.56 5.16 4.80 984 1.19 0.29 0.08 1.15
incl. 48.45 49.12 0.67 0.62 1,827 7.34 0.48 0.08 0.50
and 50.66 51.56 0.90 0.84 4,050 0.49 1.22 0.31 6.17
ZKX1142 145.65 146.85 1.20 0.98 38 7.01 0.07 0.05 0.01
ZKX11806 88.93 89.48 0.55 0.97 46 11.63 0.16 0.02 0.21
ZKX11810 235.90 237.43 1.53 1.23 148 1.63 0.03 0.05 0.57
ZKX11811 103.94 105.90 1.96 1.54 344 2.79 0.39 0.04 0.20
ZKX1337 151.03 153.86 2.83 0.99 3 0.10 0.03 5.88 0.01
incl. 152.73 153.86 1.13 0.40 7 0.17 0.06 13.80 0.01
ZKX14209 132.81 134.52 1.71 1.46 236 1.81 0.58 0.12 0.04
ZKX14209 137.15 139.32 2.17 1.86 139 3.11 0.18 0.05 0.02
ZKX14209 152.55 153.35 0.80 0.69 181 4.94 3.54 0.05 0.02
ZKX14209 179.51 180.67 1.16 0.99 513 2.96 0.31 0.16 0.08
Tunnelling programs at the LMW mine
A total of 1,753 metres of exploration tunnels have been developed at the LMW mine during this period. The exploration tunnelling, comprising drifting, crosscutting and raising, was driven along and across major mineralized vein structures to upgrade the drill-defined mineral resources and to test for new parallel and splay structures.
At the elevation of 834 m, three decline tunnels exposed low-angle gold vein LM22 with ore lengths of 20 m, 18 m and 10 m and gold grades of 26.89 g/t, 20.80 g/t and 38.95 g/t, respectively. A four-hole drilling program has been initiated to test the continuity of LM22 at the 834 m elevation.
SUMMARY OF THE TUNNELLING PROGRAM AT THE LMW MINE
Channel
Total samples Drift Total mineralization exposed by drifts (1)
Major target veins tunnelling collected included Length True width Ag Pb Zn Au Cu
(m) (m) (m) (m) (g/t) (%) (%) (g/t) (%)
W1, W2, W18,
W6W, LM22,
LM8-2, LM17,
LM41E, LM50,
LM20E, LM12-1,
LM7, LM20, LM11
and LM14 1,753 1,358 738 385 0.71 519 2.71 0.43 2.72 0.70
(1) Mineralization is defined by silver equivalent value (AgEq) greater than or equal to 145 g/t at the
LMW mine (formula used for AgEq calculation: AgEq equals Ag g/t plus 64.66 times Au g/t plus 34.07 times
Pb per cent).
SELECTED MINERALIZED ZONES EXPOSED BY DRIFT TUNNELLING AT THE LMW MINE
Tunnel ID Length Ore length True width Ag Pb Zn Au Cu
(m) (m) (m) (g/t) (%) (%) (g/t) (%)
XPDS-LM17-625-28SYM 206 35 0.87 720 4.31 0.49 0.02 0.47
XPDS-LM17-575-26SYM 148 77 0.89 316 4.30 0.77 0.02 0.15
XPDS-LM17-525-24SYM 260 10 0.80 635 1.19 0.27 0.02 0.47
PD924-LM22-834-3YMXS 20 18 0.53 23 0.08 0.01 20.80 0.69
PD924-LM22-834-5YMSD 10 10 0.39 54 0.04 0.03 38.95 5.63
PD924-LM22-834-5YMSS 26 20 0.38 97 0.06 0.09 26.89 12.93
XPDN-LM41E-700-9NYM 76 35 0.64 823 4.45 0.25 0.02 0.16
XPDN-LM50-800-7NYM 32 20 1.15 131 1.40 0.26 0.02 0.05
XPDN-LM50-800-7SYMCM 160 20 0.73 4 0.05 0.03 4.02 0.01
PD918-W1-918-4NYM 30 30 0.61 1,222 3.74 0.98 0.15 0.34
PD918-W1-918-4SYM 65 15 0.85 1,561 4.31 0.62 0.02 0.45
PD918-W1-880-8NYM 150 45 0.66 336 2.38 0.18 0.02 0.03
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 in Tianjin, China. All three labs are ISO9000-certified analytical labs. For analysis, the sample is dried and crushed to minus one millimetre and then split into a 200- to 300-gram 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 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 one 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-gram sample of minus 160 mesh is prepared for assay. A duplicate sample of minus one millimetre is made and kept in the laboratory archives. Gold is analyzed by fire assay with AAS finish while 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 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' QA/QC 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. Silvercorp balances profitability, social and environmental relationships, employees' well-being, and sustainable development.
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