Mr. Guoliang Ma reports
SILVERCORP INTERSECTS VEIN V2E1 WITH 6 METRES TRUE WIDTH GRADING 258 GRAMS PER TONNE SILVER, 7% LEAD AND 7% ZINC AT THE GC MINE, CHINA
Silvercorp Metals Inc. has released results from its exploration programs at the GC silver-lead-zinc mine, Guangdong province, China. Extensive drilling and tunnelling are continuing at the GC mine with seven rigs currently drilling.
From Oct. 1, 2019, to June 30, 2021, 72,878 metres from a total of 704 underground diamond drill holes were completed at the GC mine, including 27,527 m from 268 holes completed in the first six months of 2021. Assay results for all the holes have been received, with 577 holes intercepting mineralization.
The diamond drilling program at the GC mine targeted: (1) blocks of known silver-lead-zinc veins in and above the production area; and (2) exploration drilling at higher elevations in the north and south sides of the resource areas.
Drilling intersected thick and high-grade veins in and above the production areas
Detailed drilling of blocks of known silver-lead-zinc veins in and above the GC mine production areas intersected high-grade veins. These mineralized occurrences were previously missed due to limited drilling and tunnelling, changes in the strikes and dips, and/or pinch swelling of the pay zones in the veins.
The high-grade intercepts from this period are associated with parallel silver-lead-zinc veins V2-2, V2-3, V2-4, V2-4E, V2-7, V2E, V2E1, V2E6, V2W, V2W-4, V2W-9, V5-7, V5-9, V7, V7-1, V7-1E, V7-3, V9-4, V9-5, V9W-2N, V9W-5, V10, V10-1, V10-20, NV10, V19, V19-8, V25, V25-1 and V25-4. Other veins include V11, V16 and NV28. There are 24 new vein structures discovered in and above the production areas, including V2E4, V2E-4E, V2E-8, V7-2, V7-5, V7S, V8-2, V8-5, V10-10, V10-11, C10-17, V10-1S, V10W, V18-2, V18-3, V18-4, V19-2, V19-7 and V19-8. The company is currently working on a technical report on the GC mine to update the resources and reserves as of Dec. 31, 2020. It is expected that mineralization in these structures can be converted quickly into reserves and mined with existing underground workings.
Highlights of high-grade intercepts at the GC mine production area:
-
Hole 20CK24A02 intersected a 6.13-metre interval (6.01-metre true width) of vein V2E1 grading 258 grams per tonne silver, 7.05 per cent lead and 7.05 per cent zinc at the minus-211-metre elevation, which includes a 1.10-metre interval (1.08-metre true width) grading 462 g/t Ag, 25.57 per cent Pb and 5.21 per cent Zn at the minus-211-metre elevation.
-
Hole 20CK2609 intersected a 7.60-metre interval (7.32-metre true width) of vein V2E1 grading 284 g/t Ag, 5.80 per cent Pb and 4.48 per cent Zn at the minus-229-metre elevation, which includes a 1.18-metre interval (1.14 m true width) grading 788 g/t Ag, 23.33 per cent Pb and 7.54 per cent Zn at the minus-229-metre elevation.
-
Hole
20CK3025 intersected a 2.93-metre interval (2.79-metre true width) of vein NV28 grading 417 g/t Ag, 19.22 per cent Pb and 1.72 per cent Zn at the minus-11-metre elevation, which includes a 1.48-metre interval (1.34-metre true width) grading 815 g/t Ag, 37.47 per cent Pb and 2.12 per cent Zn at the minus-11-metre elevation.
-
Hole 19CK11308 intersected a 2.11-metre interval (1.88-metre true width) of vein V9W-5 grading 454 g/t Ag, 11.00 per cent Pb and 2.76 per cent Zn at the 150-metre elevation, which includes a 0.84-metre interval (0.65-metre true width) grading 1,066 g/t Ag, 25.31 per cent Pb and 4.85 per cent Zn at the 150-metre elevation.
-
Hole 19CK10707 intersected a 2.59-metre interval (2.07-metre true width) of vein V10-1 grading 345 g/t Ag, 1.36 per cent Pb and 14.87 per cent Zn at the 156-metre elevation, which includes a 1.59-metre interval (1.27-metre true width) grading 550 g/t Ag, 2.14 per cent Pb and 23.45 per cent Zn at the 156-metre elevation.
-
Hole 20CK4608 intersected a 1.75-metre interval (1.21-metre true width) of vein V33 grading 308 g/t Ag, 2.08 per cent Pb and 16.28 per cent Zn at the minus-four-metre elevation.
-
Hole 20CK11805 intersected a 0.74-metre interval (0.74-metre true width) of newly discovered vein V18-3 grading 557 g/t Ag, 1.21 per cent Pb and 14.82 per cent Zn at the minus-11-metre elevation.
Drilling intersected newly discovered high-grade veins at higher elevations to the north and south of the existing resource area
Exploratory underground drilling discovered high-grade silver-lead-zinc veins V33-1, V33-2, V35, V52-2, V52-3 and V59 in the south and veins NV2, NV3 and NV6 in the north of the existing resource area at the GC mine. These discoveries confirm the potential to expand the resource area outward and extend the mine life at the GC mine.
-
Hole
21CK4235 intersected a 2.71-metre interval (2.19-metre true width) of newly discovered vein V52-2 grading 264 g/t Ag, 0.25 per cent Pb and 17.02 per cent Zn at the minus-three-metre elevation.
-
Hole
21CK4820 intersected a 2.16-metre interval (1.30-metre true width) of newly discovered vein V35 grading 539 g/t Ag, 8.06 per cent Pb and 3.23 per cent Zn at the 140-metre elevation.
-
Hole
20CK46A01 intersected a 0.87-metre interval (0.46-metre true width) of newly discovered vein V33-2 grading 994 g/t Ag, 5.18 per cent Pb and 5.52 per cent Zn at the 149-metre elevation.
-
Hole 21CK42A35 intersected a 0.94-metre interval (0.72-metre true width) of newly discovered vein V52-2, grading 78 g/t Ag, 0.08 per cent Pb and 25.07 per cent Zn at the minus-one-metre elevation.
SELECTED INTERCEPTS FROM THE 2019-2021 EXPLORATION PROGRAMS AT THE GC MINE
Hole ID From To Elevation Interval True width Ag Pb Zn
(m) (m) (m) (m) (m) (g/t) (%) (%)
19CK10706 0.19 1.00 157 0.81 0.65 186 0.62 9.70
19CK10707 0.00 2.59 156 2.59 2.07 345 1.36 14.87
incl. 1.00 2.59 156 1.59 1.27 550 2.14 23.45
19CK10907 0.00 0.62 157 0.62 0.50 310 0.06 12.06
19CK11308 54.45 56.56 150 2.11 1.88 454 11.00 2.76
incl. 55.13 55.97 150 0.84 0.65 1,066 25.31 4.85
19CK8802 92.28 92.70 31 0.42 0.34 103 6.59 21.43
20CK10202 18.96 19.58 93 0.62 0.58 260 4.17 6.18
20CK10215 40.05 40.70 78 0.65 0.47 750 20.94 4.35
20CK10920 51.30 52.00 -170 0.70 0.69 40 3.88 9.98
20CK11115 39.02 40.16 134 1.14 1.01 242 1.40 9.47
20CK11207 41.11 42.60 -53 1.49 0.49 228 1.47 9.56
20CK11311 34.97 35.50 153 0.53 0.62 172 0.04 13.52
20CK11315 49.99 50.79 44 0.80 0.76 854 0.34 0.43
20CK11315 69.98 77.50 41 7.52 4.20 364 2.17 4.59
20CK11406 38.27 38.66 90 0.39 0.39 781 0.47 8.66
20CK11503 102.21 103.18 91 0.97 0.97 516 3.22 0.27
20CK11505 23.39 24.37 98 0.98 0.98 359 1.72 10.72
20CK11603 105.56 110.40 -53 4.84 2.78 115 0.89 11.67
incl. 107.60 108.91 -53 1.31 0.75 233 0.13 28.71
20CK11620 12.14 12.65 43 0.51 0.45 1,587 0.93 1.74
20CK11704 111.21 111.75 24 0.54 0.44 499 3.64 6.34
20CK11716 112.02 112.52 -158 0.50 0.50 144 5.10 7.31
20CK11716 134.84 137.91 -171 3.07 2.41 72 3.22 6.58
20CK11805 104.30 105.04 -11 0.74 0.74 557 1.21 14.82
20CK11808 104.05 104.61 24 0.56 0.38 533 2.98 7.51
20CK11810 50.52 51.41 3 0.89 0.66 134 3.20 11.59
20CK2407 36.34 37.06 41 0.72 0.49 423 17.20 6.79
20CK24A02 53.41 59.54 -211 6.13 6.01 258 7.05 7.05
incl. 53.79 54.89 -211 1.10 1.08 462 25.57 5.21
20CK24A03 51.03 57.44 -231 6.41 6.14 139 1.99 3.98
20CK24A15 44.06 45.39 39 1.33 1.00 177 0.85 9.16
20CK24A16 45.55 46.92 25 1.37 1.06 258 0.31 12.80
20CK2608 55.31 61.79 -211 6.48 6.05 134 3.81 4.02
20CK2609 54.30 61.90 -229 7.60 7.32 284 5.80 4.48
incl. 57.73 58.91 -229 1.18 1.14 788 23.33 7.54
20CK2624 6.91 13.12 -251 6.21 3.53 157 3.51 4.80
20CK2625 28.24 33.13 -267 4.89 2.53 159 2.04 6.35
20CK2818 76.71 77.78 -214 1.07 0.91 159 9.34 5.22
20CK3025 38.96 41.89 -11 2.93 2.79 417 19.22 1.72
incl. 38.96 40.44 -11 1.48 1.34 815 37.47 2.12
20CK3027 39.64 41.02 -32 1.38 1.19 500 19.31 7.88
20CK30A16 29.39 30.46 -129 1.07 0.59 63 0.51 16.09
20CK34A07 50.96 52.52 -55 1.56 1.02 182 5.12 7.05
20CK34A11 143.21 147.54 -225 4.33 3.97 148 3.52 6.51
20CK34A15 70.96 72.17 -211 1.21 1.19 183 4.15 7.00
20CK3616 94.06 95.40 -23 1.34 1.30 144 6.30 8.56
20CK3619 70.53 75.45 -234 4.92 4.17 147 1.24 4.45
20CK3620 0.00 5.01 3 5.01 2.62 339 1.34 2.41
20CK3819 108.75 113.74 -183 4.99 3.03 180 0.82 3.84
20CK4012 19.60 22.50 -2 2.90 2.77 222 2.51 2.15
20CK40A10 16.92 18.45 -42 1.53 0.78 451 4.20 1.18
20CK40A12 86.11 86.65 45 0.54 0.53 402 7.07 2.86
20CK4608 49.62 51.37 -4 1.75 1.21 308 2.08 16.28
20CK46A01 57.56 58.43 149 0.87 0.46 994 5.18 5.52
20CK46A01 72.76 73.50 146 0.74 0.56 447 2.04 5.28
20CK4802 135.29 135.76 39 0.47 0.46 115 0.54 18.05
20CK601 41.85 42.45 38 0.60 0.60 1,428 0.70 0.45
20CK9601 80.80 81.30 -107 0.50 0.48 187 17.60 4.76
21CK10536 34.79 35.98 90 1.19 0.72 188 3.67 7.50
21CK11103 86.88 89.20 145 2.32 1.95 172 2.15 7.89
21CK11131 69.02 74.54 -184 5.52 5.05 94 3.96 3.54
21CK11305 83.99 86.46 -181 2.47 1.92 206 4.88 11.86
21CK11616 78.87 82.33 -164 3.46 2.76 134 3.84 2.62
21CK1608 20.80 21.36 46 0.56 0.48 779 1.10 0.66
21CK16A09 152.52 154.27 108 1.75 1.66 742 1.90 1.63
21CK16A16 4.16 5.38 101 1.22 1.20 633 0.97 1.62
21CK16A16 10.80 11.43 99 0.63 0.63 634 10.32 11.68
21CK1810 22.46 25.70 40 3.24 2.63 388 1.29 3.71
21CK18A09 50.36 51.93 120 1.57 1.21 948 1.51 0.88
21CK2207 66.60 73.36 -278 6.76 5.73 130 4.65 3.93
21CK2207 85.22 88.70 -268 3.48 2.90 100 5.08 4.80
21CK2208 66.60 68.09 -278 1.49 1.26 384 13.05 7.47
21CK2241 23.82 25.20 -24 1.38 1.21 348 6.59 4.87
21CK2242 4.44 6.63 -4 2.19 0.49 255 7.82 6.02
21CK2460 32.38 33.04 34 0.66 0.56 160 0.15 13.10
21CK2461 39.36 40.03 34 0.67 0.59 463 0.45 15.24
21CK24A09 19.74 23.30 -255 3.56 2.78 258 3.07 6.63
21CK2638 17.00 24.11 -253 7.11 5.82 139 1.89 5.06
21CK2638 133.04 144.31 -274 11.27 11.13 86 2.35 4.58
21CK2641 91.61 96.86 -14 5.25 5.02 152 0.19 6.51
21CK26A23 52.67 59.00 -276 6.33 6.16 121 3.68 5.66
21CK26A24 19.72 25.63 -270 5.91 5.10 116 2.14 4.09
21CK26A42 80.70 82.33 -12 1.63 1.55 152 4.92 10.12
21CK26A50 31.01 31.38 73 0.37 0.31 356 0.00 28.12
21CK26A50 36.93 37.44 68 0.51 0.51 244 0.04 11.81
21CK26A53 24.77 26.60 77 1.83 1.65 127 0.02 11.99
21CK26A54 44.25 45.09 57 0.84 0.57 225 0.08 13.75
21CK2821 25.73 35.87 -272 10.14 9.30 203 2.93 4.81
21CK2821 127.72 130.67 -339 2.95 2.58 202 0.28 9.97
21CK2822 23.74 38.47 -275 14.73 12.89 127 2.06 4.03
21CK2823 17.78 22.91 -271 5.13 4.39 176 2.78 3.80
21CK2824 26.38 41.65 -266 15.27 13.49 104 2.06 4.28
21CK3212 21.03 21.55 97 0.52 0.51 166 5.63 6.37
21CK32A10 113.17 114.04 -140 0.87 0.76 81 6.30 5.25
21CK32A32 138.29 139.47 -145 1.18 0.85 244 0.28 25.52
21CK32A42 85.50 86.10 -131 0.60 0.57 114 0.04 17.16
21CK3422 106.60 107.21 79 0.61 0.59 210 0.07 18.06
21CK34A12 30.42 31.01 34 0.59 0.59 316 1.27 13.00
21CK4235 64.69 67.40 -3 2.71 2.19 264 0.25 17.02
21CK42A35 47.15 48.09 -1 0.94 0.72 78 0.08 25.07
21CK4820 47.55 49.71 140 2.16 1.30 539 8.06 3.23
21CK5005 55.30 55.70 45 0.40 0.40 1,344 0.54 0.46
Tunnelling programs at the GC mine
In addition to the drilling program, 16,070 m of exploration drift tunnelling was developed at the GC mine during this period. The exploration tunnelling, composed of drifting, crosscutting and raising, was driven along and across major mineralized vein structures to upgrade the drill-defined mineral resources and test for new parallel and splay structures.
Highlights of selected mineralized zones exposed in the drift tunnels:
-
Drift tunnel V5-9-(-50)-30NEYM exposed mineralization 60 m long and 1.09 m wide (true width) grading 357 g/t Ag, 4.72 per cent Pb and 10.08 per cent Zn within vein V5-9 at the minus-50-metre elevation.
-
Drift tunnel V19-(-75)-42WYM exposed mineralization 28 m long and 0.91 m wide (true width) grading 234 g/t Ag, 13.56 per cent Pb and 6.42 per cent Zn within vein V19 at the minus-100-metre elevation.
-
Drift tunnel V19-(-50)-48ANEYM exposed mineralization 65 m long and 1.20 m wide (true width) grading 161 g/t Ag, 2.28 per cent Pb and 12.18 per cent Zn within vein V19 at the minus-50-metre elevation.
-
Drift tunnel V52-150-119NEYM exposed mineralization 50 m long and 0.86 m wide (true width) grading 454 g/t Ag, 3.88 per cent Pb and 7.39 per cent Zn within vein V52 at the 150-metre elevation.
-
Drift tunnel V10-1-150-38ANEYM exposed mineralization 135 m long and 0.60 m wide (true width) grading 288 g/t Ag, 0.77 per cent Pb and 12.61 per cent Zn within vein V10-1 at the 150-metre elevation.
SELECTED MINERALIZED ZONES EXPOSED BY DRIFT TUNNELLING AT THE GC MINE
Tunnel ID Vein Elevation Ore length True width Ag Pb Zn
(m) (m) (m) (g/t) (%) (%)
V1-(-150)-32ASYM V1 -150 67.0 0.54 53 3.90 3.95
V1-2-(-150)-20WYM V1-2 -150 10.0 0.47 272 7.83 3.50
V2-1-(-250)-26AEYM V2-1 -250 25.0 0.74 117 3.15 3.21
V2-2-(-200)-30EYM V2-2 -200 31.0 0.83 104 0.49 2.85
V2E-(-250)-26ASEYM V2E -250 88.0 1.22 50 0.76 3.69
V2E1-(-250)-24AEYM V2E1 -250 33.0 1.86 81 0.76 2.90
V2E1-(-300)-26AEYM V2E1 -300 11.0 2.24 109 1.50 5.98
V2E-4E-(-50)-44ANEYM V2E-4E -50 48.0 0.46 104 2.36 6.95
V2E-4E-(-100)-46AWYM V2E-4E -100 39.0 0.60 79 1.87 6.68
V2E-4E-(-100)-46AEYM V2E-4E -100 15.0 0.55 40 0.53 6.71
V2W-(-200)-22SWYM V2W -200 91.0 1.78 102 2.84 4.61
V2W-(-200)-22NEYM V2W -200 94.0 2.07 90 2.47 4.11
V2W_YM V2W -200 28.0 1.10 98 2.83 3.55
V2W-(-250)-24NEYM V2W -250 54.0 2.48 137 2.58 3.55
V2W-(-250)-24SWYM V2W -250 28.0 1.75 62 1.84 3.26
V2W-4-(-200)-22AWYM V2W-4 -200 16.0 0.90 247 7.88 5.80
V2W-9-(-200)-22WYM V2W-9 -200 31.0 0.76 114 3.41 4.04
V5-50-30AEYM V5 50 25.0 0.89 274 0.17 10.13
V5-9-(-50)-30NEYM V5-9 -50 60.0 1.09 357 4.72 10.08
V5-9-(-200)-36NYM V5-9 -200 50.0 1.18 107 2.02 3.72
V6E3-0-32EYM V6E3 0 50.0 0.42 142 12.08 10.16
V6M-2-(-150)-18SEYM V6M-3 -150 80.0 0.61 65 3.59 3.19
V7-3-100-30WYM V7-3 100 27.0 0.30 102 0.03 14.94
V9-5-100-28AEYM V9-5 100 50.0 0.37 186 0.35 11.68
V9-5-(-100)-32WYM V9-5 -100 15.0 1.15 83 2.37 3.07
V9-5-(-250)-24EYM V9-5 -250 87.0 0.87 68 2.06 3.12
SV10-(-150)-42NEYM SV10 -150 19.0 1.53 109 2.04 3.91
SV10-(-150)-42SWYM SV10 -150 22.0 1.53 109 2.04 3.91
V10-(-100)-46EYM V10 -100 178.0 0.95 60 2.12 3.44
V10-(-150)-40NEYM V10 -150 40.0 1.28 98 2.92 3.43
V10-(-150)-44NEYM V10 -150 196.0 1.25 71 1.79 4.19
V10-(-150)-40SWYM V10 -150 46.0 1.50 28 0.53 4.69
V10-(-130)-107SWYM V10 -150 10.0 0.71 44 1.42 3.15
V10-(-150)-44SWYM V10 -150 34.0 1.39 39 1.47 2.73
V10-1-135-40SWYM V10-1 150 37.0 0.71 203 0.86 15.03
V10-1-150-38ANEYM V10-1 150 135.0 0.60 288 0.77 12.61
V10-1-(-50)-40SWYM V10-1 -50 20.0 0.78 143 0.37 3.77
V10-1-(-100)-42ASWYM V10-1 -100 43.0 1.15 199 0.74 3.53
V10-1-(-150)-44SWYM V10-1 -150 25.0 0.84 116 0.74 5.16
V10W-(-150)-40WYM V10W -150 15.0 1.54 198 2.05 3.62
V14-50-46SWYM V13 50 131.0 0.71 92 0.79 9.35
V14-(-50)-116SWYM V13 -50 20.0 0.95 148 1.16 13.57
V14-(-100)-50NEYM V14 -100 67.0 0.90 55 2.20 2.08
V16-150-30AEYM V16 150 9.0 0.69 808 1.84 1.99
V16-135-32EYM V16 150 53.0 0.66 456 1.48 4.50
V16-135-32WYM V16 150 131.0 0.39 358 1.43 4.15
V16-150-32EYM V16 150 40.0 0.61 105 0.67 5.49
V16-150-34AEYM V16 150 35.0 0.53 133 1.50 2.51
V16-110-34EYM V16 100 80.0 0.66 136 0.66 6.12
V17-(-100)-34AEYM V16 -100 6.0 0.52 1260 4.27 2.10
V17-0-34WYM V17 0 39.0 0.32 273 0.34 22.88
V17-0-34EYM V17 0 69.0 0.36 517 0.71 12.46
V17-(-50)-34EYM V17 -50 40.0 0.58 126 0.93 3.80
V17-(-100)-30AEYM V17 -100 35.0 0.83 57 1.70 2.70
V17-1-0-34WYM V17-1 0 19.0 1.75 596 1.37 2.91
V17-1-0-34EYM V17-1 0 27.5 0.41 304 0.88 4.67
V17-1-(-45)-34EYM V17-1 -50 33.0 0.56 84 1.03 4.66
V17-1-(-45)-34WYM V17-1 -50 25.0 0.58 70 0.25 3.17
V18-150-28AEYM V18 150 22.0 0.54 273 0.87 1.98
V8-(-50)-30AEYM V18 -50 72.0 1.11 315 2.16 2.90
V18-(-100)-30AEYM V18 -100 46.0 1.37 163 3.16 8.10
V18-(-100)-30AWYM V18 -100 11.0 1.29 92 2.28 6.87
V19-(-50)-48ANEYM V19 -50 65.0 1.20 161 2.28 12.18
V19-(-75)-42WYM V19 -100 28.0 0.91 234 13.56 6.42
V19-(-75)-42EYM V19 -100 31.0 1.04 70 5.89 4.17
V19-(-100)-46EYM V19 -100 99.0 0.77 101 0.66 7.64
V19-(-150)-40WYM V19 -150 14.0 1.64 151 1.34 3.72
V19-(-150)-40EYM V19 -150 70.0 0.91 81 1.42 3.81
V19-(-150)-44EYM V19 -150 15.0 0.72 64 2.04 2.92
V19-6-100-40WYM V19-6 100 22.0 1.21 99 2.20 2.04
V25-(-200)-105NEYM V25 -200 15.0 1.87 77 0.96 3.30
V32-0-50ANEYM V32 0 73.0 0.40 635 4.57 3.54
V32-20-50NEYM V32 0 18.0 0.44 132 3.10 6.18
V32-20-50SWYM V32 0 38.0 0.44 132 3.10 6.18
V32-0-50ASWYM V32 0 10.0 0.59 87 2.25 2.19
V33-0-52SWYM V33 0 60.0 0.92 201 5.77 5.15
V33-0-52YM V33 0 76.0 0.98 163 3.23 4.19
V37-50-44ANEYM V37 50 27.0 0.74 86 6.79 7.70
V40-(-85)-12WYM V40 -100 9.0 0.99 257 5.75 6.34
V52-150-38WYM V52 150 11.5 0.45 307 0.93 20.84
V52-150-119NEYM V52 150 50.0 0.86 454 3.88 7.39
V19-2-150-40ASEYM V59 150 22.0 0.50 226 4.22 3.65
VH1-0-32NEYM VH1 0 16.0 1.06 40 3.50 5.16
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 on-site laboratory (Laboratory of Guangdong Found).
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 shipped in securely sealed bags to the on-site laboratory.
For analysis, the sample is dried and crushed to minus one millimetre and then split to 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 two acids for analysis of silver, lead, zinc and copper with atomic absorption spectroscopy (AAS), and the other is retained as pulp reject at the lab for future reference.
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 CRMs, 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.
We seek Safe Harbor.
© 2024 Canjex Publishing Ltd. All rights reserved.