Mr. Guoliang Ma reports
SILVERCORP INTERSECTS VEIN T15W2 WITH 1.74 METRES TRUE WIDTH GRADING 3,911 GRAMS PER TONNE SILVER, 6.22% LEAD, 2.11% ZINC AND 0.55% COPPER AT THE TLP MINE, YING MINING DISTRICT, CHINA
Silvercorp Metals Inc. has released results from its 2021 exploration programs at the TLP mine, Ying mining district, Henan province, China. Extensive exploration drilling and tunnelling are continuing at the TLP mine and all other mines at the Ying mining district.
From Oct. 1, 2020, to May 31, 2021, 34,546 metres from a total of 196 diamond drill holes, including 161 underground holes and 35 surface holes, were completed at the TLP mine. Assay results for 193 holes have been received with 108 holes intercepting mineralization. Currently, 13 rigs are drilling at the TLP mine.
Drilling intersected high-grade veins in the production areas
The diamond drilling programs at the TLP mine targeted resource blocks of known silver-lead-zinc veins in the production areas that were missed by limited prior drilling and drifting tunnels, as a result of changes in the dip and 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 T15W, T15W1, T15W2 and T15W3. Other veins include T16E, T2, T2W, T3, T16E, T11, T1, T1a, T22, T23, T24, T33 and T35E1. Highlights of high-grade intercepts in the TLP production area:
- Hole
ZKG6AT15W304 intersected a 2.49-metre interval (1.74 m true width) of vein T15W2 grading 3,911 grams per tonne silver, 6.22 per cent lead, 2.11 per cent zinc, 0.08 g/t gold and 0.55 per cent copper at the 808 m elevation, which includes a 0.97 m interval (0.68 m true width) grading 9,901 g/t Ag, 15.30 per cent Pb, 5.27 per cent Zn, 0.19 g/t Au and 1.39 per cent Cu.
- Hole
ZKG6AT15W305 intersected a 1.62 m interval (1.11 m true width) of vein T15W3 grading 1,556 g/t Ag, 15.27 per cent Pb, 0.24 per cent Zn, 0.10 g/t Au and 0.23 per cent Cu at the 813 m elevation.
- Hole
ZKT3AT1W101 intersected a 4.00 m interval (2.56 m true width) of vein T23 grading 771 g/t Ag, 11.68 per cent Pb, 0.23 per cent Zn, 0.08 g/t Au and 0.11 per cent Cu at the 854 m elevation.
- Hole
ZKT7T3E02 intersected an 8.44 m interval (5.04 m true width) of vein T3E grading 523 g/t Ag, 5.10 per cent Pb, 0.36 per cent Zn, 0.11 g/t Au and 0.13 per cent Cu at the 1,086 m elevation, which includes a 4.20 m interval (2.51 m true width) grading 1,036 g/t Ag, 9.96 per cent Pb, 0.67 per cent Zn, 0.18 g/t Au and 0.24 per cent Cu at the 1,087 m elevation.
- Hole
ZKT23J001 intersected a 0.89 m interval (0.74 m true width) of vein T2 grading 1,283 g/t Ag, 8.60 per cent Pb, 2.30 per cent Zn, 4.22 g/t Au and 1.30 per cent Cu at the 676 m elevation.
- Hole
ZKTDB39T103 intersected a 2.90 m interval (2.03 m true width) of vein T3 grading 1,115 g/t Ag, 1.20 per cent Pb, 0.09 per cent Zn, 0.08 g/t Au and 0.11 per cent Cu at the 818 m elevation.
- Hole
ZKTDB05Y03-1 intersected a 0.52 m interval (0.51 m true width) of vein T35E1 grading 2,086 g/t Ag, 5.79 per cent Pb, 0.62 per cent Zn, 0.05 g/t Au and 0.35 per cent Cu at the 914 m elevation.
-
Hole
ZKTDB43T302 intersected a 1.04 m interval (0.72 m true width) of vein T3E grading 520 g/t Ag, 1.25 per cent Pb, 0.05 per cent Zn, 4.36 g/t Au and 0.11 per cent Cu at the 730 m elevation.
Surface and underground drilling outside the TLP mine's resource area
Exploratory surface drilling in the east and south sides of the resource area in the TLP mine discovered high-grade silver-lead-zinc mineralization at higher elevations. These intercepts of veins T39E2, T17 and T38 are expected to expand the resources in these areas:
-
Hole ZKG4T15W113 intersected a 3.96 m interval (3.62 m true width) of vein T15W1 grading 1,086 g/t Ag, 0.93 per cent Pb, 0.19 per cent Zn, 0.19 g/t Au and 0.15 per cent Cu at the 672 m elevation.
- Hole ZKTDB20T1701 intersected a 3.48 m interval from 170.40 m to 173.88 m (2.54 m true width) of vein T17 grading 675 g/t Ag, 0.92 per cent Pb, 0.43 per cent Zn, 0.01 g/t Au and 0.15 per cent Cu at the 893 m elevation, which includes a 0.78 m interval from 171.26 m to 172.04 m (0.57 m true width) grading 2,206 g/t Ag, 1.44 per cent Pb, 0.71 per cent Zn, 0.02 g/t Au and 0.40 per cent Cu at the 892 m elevation.
- Hole
ZKTDB27AT39E201 intersected a 0.81 m interval from 99.41 m to 100.22 m (0.56 m true width) of vein T39E2 grading 1,705 g/t Ag, 1.3 per cent Pb, 0.35 per cent Zn, 0.02 per cent Au and 0.06 per cent Cu at the 803 m elevation.
- Hole
ZKTDB25AT39E201 intersected a 1.71 m interval from 169.08 m to 170.79 m (0.46 m true width) of vein T39E2 grading 456 g/t Ag, 16.16 per cent Pb, 2.55 per cent Zn, 0.01 per cent Au and 0.11 per cent Cu at the 785 m elevation.
SELECTED INTERCEPTS FROM THE 2021 DRILL PROGRAMS AT THE TLP MINE
Hole ID From To Interval True width Ag Pb Zn Au Cu
(m) (m) (m) (m) (g/t) (%) (%) (g/t) (%)
ZKG02AT1101 8.63 9.48 0.85 0.56 789 2.25 0.36 0.05 0.08
ZKG02AT1101 134.30 135.77 1.47 0.94 124 0.42 0.35 0.05 0.06
ZKG06AT15W101 88.62 89.37 0.75 0.54 149 1.89 0.38 0.02 0.05
ZKG06AT15W301 74.21 75.46 1.25 0.88 79 2.13 0.12 0.05 0.02
ZKG06AT16E01 22.99 23.76 0.77 0.35 139 0.94 0.03 0.05 0.02
ZKG06J001 172.50 173.72 1.22 1.17 100 3.00 0.17 0.05 0.07
ZKG06J004 116.53 117.12 0.59 0.56 71 2.02 0.08 0.05 0.02
ZKG06J004 163.99 164.47 0.48 0.46 53 9.42 0.15 0.05 0.02
ZKG06J01 78.47 79.25 0.78 0.71 105 2.20 0.21 0.06 0.01
ZKG06J01 138.49 139.04 0.55 0.50 235 1.01 0.14 0.05 0.08
ZKG06J04 117.14 117.93 0.79 0.65 1,043 3.00 0.15 0.10 0.15
ZKG06T1101 66.08 67.18 1.10 0.92 48 2.85 0.23 0.18 0.02
ZKG06T1102 77.45 78.18 0.73 0.57 59 2.18 0.60 0.02 0.01
ZKG06T1102 138.01 138.93 0.92 0.72 101 1.08 0.04 0.02 0.01
ZKG08AT1101 138.30 139.33 1.03 0.83 79 1.63 0.11 0.10 0.02
ZKG08AT1101 146.80 148.27 1.47 1.22 59 2.27 0.11 0.10 0.01
ZKG08S01-12 0.43 1.33 0.90 0.85 236 4.61 0.54 0.05 0.04
ZKG08S01-12 31.74 32.67 0.93 0.92 159 0.26 0.46 0.05 0.05
ZKG0936 18.13 18.64 0.51 0.27 225 0.61 0.44 0.07 0.02
ZKG0936 179.66 180.26 0.60 0.31 219 3.43 1.12 0.03 0.01
ZKG10AT1102 98.36 98.87 0.51 0.48 196 1.68 0.16 0.05 0.03
ZKG10AT1102 144.53 145.59 1.06 1.02 223 0.68 0.11 0.10 0.08
ZKG1217 53.03 53.57 0.54 0.30 180 0.74 0.23 0.03 0.07
ZKG1218 145.13 146.13 1.00 0.95 262 1.17 0.11 0.05 0.03
ZKG1218 178.67 179.42 0.75 0.71 226 0.38 0.15 0.21 0.02
ZKG12AT15W01 94.72 95.23 0.51 0.48 96 0.99 0.09 0.05 0.05
ZKG12AT15W01 254.59 255.09 0.50 0.45 349 0.81 0.30 0.05 0.02
ZKG12AT15W101 155.03 155.78 0.75 0.39 242 3.61 0.22 0.05 0.05
ZKG16AT1101 177.28 177.85 0.57 0.50 550 2.27 0.19 0.02 0.24
ZKG4AT15W101 66.89 69.03 2.14 1.02 560 4.24 1.72 0.13 0.35
ZKG4AT15W102 183.90 184.56 0.66 0.50 203 1.01 0.13 0.02 0.01
ZKG4AT16E202 76.20 76.96 0.76 0.22 636 5.73 0.21 0.02 0.18
ZKG4AT16E202 79.74 80.79 1.05 0.31 94 2.19 0.09 0.01 0.02
ZKG4AT16E203 93.96 95.29 1.33 1.25 59 6.09 2.42 0.05 0.04
ZKG4T15W113 137.93 141.89 3.96 3.62 1,086 0.93 0.19 0.19 0.15
ZKG4T15W114 143.55 144.04 0.49 0.41 95 3.09 0.31 0.05 0.02
ZKG4T15W114 155.80 158.32 2.52 1.88 479 1.29 0.27 0.29 0.07
ZKG6AT15W303 18.44 19.47 1.03 0.55 214 0.80 0.06 0.10 0.03
ZKG6AT15W304 68.56 69.71 1.15 0.81 284 1.16 0.31 0.02 0.22
ZKG6AT15W304 83.91 86.40 2.49 1.74 3,911 6.22 2.11 0.08 0.55
including 84.67 85.64 0.97 0.68 9,901 15.30 5.27 0.19 1.39
ZKG6AT15W305 63.47 64.13 0.66 0.45 200 6.61 0.13 0.05 0.04
ZKG6AT15W305 78.22 79.84 1.62 1.11 1,556 15.27 0.24 0.10 0.23
ZKG6AT16E10 30.77 34.30 3.53 0.67 589 0.98 0.13 0.02 0.06
including 33.48 34.30 0.82 0.15 2,267 2.55 0.50 0.07 0.20
ZKG6AT16E11 22.71 24.10 1.39 0.79 528 3.12 0.05 0.02 0.04
including 23.50 24.10 0.60 0.34 1,089 7.19 0.11 0.04 0.07
ZKG8AT15W302 126.18 127.40 1.22 1.11 98 1.74 0.12 0.05 0.01
ZKG8AT16E201 81.49 82.36 0.87 0.79 177 2.34 0.21 0.05 0.09
ZKT04T2E02 220.62 221.76 1.14 0.99 127 0.31 0.05 0.02 1.09
ZKT05AT2301 106.40 111.30 4.90 3.30 97 1.00 0.08 0.29 0.03
including 106.40 106.80 0.40 0.22 804 2.66 0.10 0.05 0.15
ZKT05AT2302 101.11 101.70 0.59 0.41 326 2.75 0.10 0.12 0.31
ZKT05AT2303 98.17 99.07 0.90 0.89 381 4.97 0.61 0.10 0.22
ZKT0724 143.73 145.56 1.83 1.81 223 1.08 0.53 0.02 0.05
ZKT0725 158.91 161.61 2.70 2.53 433 1.96 0.93 0.05 0.18
ZKT07AT201 78.81 80.09 1.28 1.09 141 2.10 0.06 0.09 0.04
ZKT07AT5E104 105.47 106.29 0.82 0.42 1,324 5.40 0.48 0.10 0.08
ZKT07AT5E105 134.62 135.99 1.37 0.83 28 3.57 0.19 0.02 0.00
ZKT07T14E03 162.44 164.70 2.26 2.16 89 2.02 0.14 0.03 0.03
ZKT07T14E05 156.81 157.41 0.60 0.57 71 4.69 0.11 0.01 0.09
ZKT07T1601 19.42 20.15 0.73 0.31 192 0.10 0.33 0.02 0.01
ZKT07Y04 23.92 24.64 0.72 0.68 762 9.07 0.54 0.83 0.12
ZKT07Y04 50.53 51.10 0.57 0.55 411 2.91 0.04 1.92 0.31
ZKT0808 211.75 212.43 0.68 0.22 1,070 1.47 0.34 0.10 0.96
ZKT0809 64.21 65.00 0.79 0.74 155 0.19 0.08 0.01 0.01
ZKT09Y17 206.29 207.09 0.80 0.68 30 6.16 0.11 0.10 0.01
ZKT09Y17 404.57 405.11 0.54 0.50 207 0.79 0.36 0.10 0.01
ZKT09Y21 104.55 106.09 1.54 1.14 161 18.39 0.23 0.10 0.11
ZKT11Y25 175.74 176.56 0.82 0.77 97 1.04 0.06 0.05 0.01
ZKT18AT1703 207.26 208.08 0.82 0.64 211 1.50 1.66 0.01 0.03
ZKT19AT33W303 24.02 24.59 0.57 0.56 135 0.23 0.22 0.01 0.03
ZKT19AT33W303 51.83 52.86 1.03 1.01 25 4.74 0.80 0.01 0.02
ZKT19T33W301 78.12 79.42 1.30 0.45 15 6.90 0.37 0.05 0.01
ZKT1AT2301 73.57 74.95 1.38 1.27 147 0.90 0.30 0.05 0.00
ZKT1T1602 98.30 98.82 0.52 0.50 206 1.16 0.66 0.05 0.03
ZKT1T1603 95.73 96.36 0.63 0.63 136 0.97 0.71 0.05 0.02
ZKT1T1603 183.99 184.98 0.99 0.57 334 0.28 0.71 0.05 0.03
ZKT21C03 145.04 145.57 0.53 0.44 191 5.63 0.25 0.21 0.02
ZKT21C05 166.15 166.75 0.60 0.46 167 1.73 2.11 0.21 0.03
ZKT21T14E09 87.07 87.60 0.53 0.13 1,148 3.19 2.24 0.09 0.20
ZKT21T22E02 216.94 217.44 0.50 0.48 105 4.67 0.67 0.10 0.08
ZKT21Y35 193.17 194.17 1.00 0.64 32 13.18 0.07 0.10 0.11
ZKT23J001 99.39 100.28 0.89 0.74 1,283 8.60 2.30 4.22 1.30
ZKT23J002 107.39 108.15 0.76 0.58 705 5.76 0.03 0.21 0.24
ZKT23J003 112.16 113.16 1.00 0.81 134 4.21 1.85 0.82 0.69
ZKT2707 105.98 106.55 0.57 0.23 292 0.39 0.14 0.13 0.01
ZKT2708 153.41 154.07 0.66 0.25 396 1.79 2.20 0.01 0.05
ZKT2708 161.96 163.99 2.03 1.54 125 0.34 0.43 1.90 0.01
ZKT27T39W01 83.89 84.43 0.54 0.44 145 1.56 0.47 0.03 0.01
ZKT29AT202 97.82 99.61 1.79 0.17 122 2.87 0.99 0.43 2.65
ZKT31AT35E03 194.56 195.27 0.71 0.46 116 20.00 4.97 0.33 0.13
ZKT31AT35E03 261.45 262.67 1.22 1.11 147 0.36 0.09 0.10 0.02
ZKT33T31W303 34.97 36.14 1.17 1.14 340 0.44 0.54 0.06 0.02
ZKT33T31W303 120.70 121.25 0.55 0.18 335 4.24 0.42 0.15 0.01
ZKT33T31W304 36.06 37.85 1.79 1.73 303 0.55 0.35 0.03 0.04
ZKT33T31W304 56.10 57.82 1.72 1.66 552 0.94 0.27 0.06 0.03
ZKT33T31W305 58.82 60.10 1.28 0.59 187 0.10 0.10 0.03 0.01
ZKT39AT31W01 54.66 55.61 0.95 0.80 200 0.42 0.13 0.57 0.02
ZKT39AT31W02 15.33 16.77 1.44 1.42 26 5.22 0.19 0.02 0.01
ZKT39AT31W02 109.52 110.65 1.13 0.32 374 3.99 1.85 0.75 0.34
ZKT39AT31W02 128.06 129.11 1.05 0.30 27 2.84 0.06 0.12 0.02
ZKT3AT1W101 98.48 102.48 4.00 2.56 771 11.68 0.23 0.08 0.11
ZKT3AT1W101 203.59 204.22 0.63 0.58 160 1.61 0.46 0.06 0.01
ZKT3AT1W104 96.12 96.84 0.72 0.47 326 17.38 0.57 0.06 0.08
ZKT5AT1W101 178.42 179.20 0.78 0.68 109 0.33 0.13 0.15 0.22
ZKT7T3E01 46.12 47.78 1.66 1.07 139 2.44 0.11 0.05 0.08
ZKT7T3E02 64.01 72.45 8.44 5.04 523 5.10 0.36 0.11 0.13
including 64.86 69.06 4.20 2.51 1,036 9.96 0.67 0.18 0.24
ZKT9AT1W102 208.22 208.83 0.61 0.60 72 1.52 0.07 0.10 0.44
ZKT9AT1W102 253.06 253.66 0.60 0.59 97 0.26 0.05 0.10 2.53
ZKT9AT1W103 14.34 14.91 0.57 0.48 172 0.33 0.18 0.12 0.01
ZKT9AT1W103 227.84 229.66 1.82 1.76 520 0.74 2.04 0.16 0.06
ZKT9AT1W103 245.94 246.49 0.55 0.53 211 0.10 0.44 0.12 0.02
ZKT9AT1W104 15.32 15.92 0.60 0.49 329 0.59 0.10 0.05 0.32
ZKT9AT1W104 220.95 221.44 0.49 0.42 319 6.86 1.16 0.05 0.06
ZKT9AT1W105 164.39 166.91 2.52 2.30 65 2.41 0.26 0.12 0.11
ZKT9AT1W105 190.36 191.37 1.01 0.92 157 0.12 0.03 0.05 0.01
ZKT9AT1W107 14.38 15.54 1.16 0.96 107 0.58 0.06 0.05 0.05
ZKTA1AT14E01 158.29 159.55 1.26 0.42 53 5.65 0.35 0.04 0.06
ZKTA3AT14E01 141.61 142.93 1.32 0.81 53 7.35 0.27 0.05 0.07
ZKTA3AT14E02 93.90 94.66 0.76 0.64 243 0.41 0.07 0.10 0.03
ZKTA5AT14E02 137.25 138.05 0.80 0.80 63 3.17 0.21 0.05 0.03
ZKTDB05AT5W101 101.19 102.35 1.16 0.62 122 0.51 0.19 0.03 0.01
ZKTDB05Y03-1 156.09 156.66 0.57 0.35 141 1.17 0.25 0.05 0.05
ZKTDB05Y03-1 185.29 185.81 0.52 0.51 2,086 5.79 0.62 0.05 0.35
ZKTDB06AT22W01 41.51 46.28 4.77 1.88 196 0.46 0.07 0.10 0.03
ZKTDB06AT22W01 50.86 52.14 1.28 0.51 94 0.88 0.11 0.10 0.03
ZKTDB06AT22W03 69.09 70.40 1.31 1.08 115 5.76 0.15 0.10 0.02
ZKTDB20T1701 170.40 173.88 3.48 2.54 675 0.92 0.43 0.01 0.15
including 171.26 172.04 0.78 0.57 2,206 1.44 0.71 0.02 0.40
ZKTDB20T1704 88.90 89.42 0.52 0.19 789 0.92 0.09 0.03 0.06
ZKTDB25AT39E201 169.08 170.79 1.71 0.46 456 16.16 2.55 0.01 0.11
ZKTDB27AT39E201 89.44 90.08 0.64 0.44 190 1.26 3.19 0.01 0.03
ZKTDB27AT39E201 99.41 100.22 0.81 0.56 1,705 1.30 0.35 0.02 0.06
ZKTDB27AT5E111 122.45 123.21 0.76 0.74 200 1.34 0.67 0.05 0.01
ZKTDB33AT31W301 32.88 33.47 0.59 0.23 233 0.28 0.10 0.08 0.01
ZKTDB33AT31W301 49.38 50.30 0.92 0.36 110 1.15 0.20 0.06 0.02
ZKTDB39T101 144.95 145.73 0.78 0.51 199 3.69 0.07 0.05 0.03
ZKTDB39T103 66.76 67.63 0.87 0.64 151 0.80 0.05 0.03 0.01
ZKTDB39T103 147.21 150.11 2.90 2.03 1,115 1.20 0.09 0.03 0.11
ZKTDB43AT303 176.86 177.44 0.58 0.37 165 0.27 0.03 0.02 0.01
ZKTDB43T301 299.35 300.13 0.78 0.58 9 3.57 0.05 0.17 0.04
ZKTDB43T302 165.24 166.38 1.14 0.84 275 0.26 0.02 0.05 0.01
ZKTDB43T302 170.81 171.99 1.18 0.85 38 3.43 0.10 0.10 0.01
ZKTDB43T302 210.24 211.23 0.99 0.70 407 0.90 0.21 0.47 0.17
ZKTDB43T302 243.39 247.69 4.30 3.01 171 2.19 0.11 1.25 0.04
including 246.65 247.69 1.04 0.72 520 1.25 0.05 4.36 0.11
Tunnelling program at the TLP mine
In addition to the drilling program, 4,526 metres of exploration drift tunnelling were developed at the TLP 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 test for new parallel and splay structures, and are summarized in the associated table.
Channel Total mineralization exposed by drifts
Total samples Drift Average true
Mine Major target veins tunnelling collected included Length width Ag Pb Zn
(m) (m) (m) (m) (g/t) (%) (%)
TLP T1, T2, T3, T3E,
T5, T26, T26E, T14E,
15W, T15W3, T33E,
T23, T11, T16, T17,
T14, T35E, T38, T39E2,
T39E and T27 7,020 3,461 4,526 1,667 0.54 276 3.06 0.60
(1) Mineralization is defined by silver equivalent value (AgEq) greater
than or equal to 130 g/t at the TLP mine.
Highlights of selected mineralized zones exposed in the drift tunnels:
- Drift tunnel PD890-T16E-890-2NYM exposed mineralization 85 m long and 0.64 m wide (true width) grading 721 g/t Ag, 2.62 per cent Pb and 0.72 per cent Zn within vein T16E on the 893 m level.
- Drift tunnel PD820-T22E-700-16NYM exposed mineralization 30 m long and 0.81 m wide (true width) grading 692 g/t Ag, 3.43 per cent Pb and 1.05 per cent Zn within vein T22E on the 704 m level.
- Drift tunnel PD960-T33-990-13NYM exposed mineralization 20 m long and 0.44 m wide (true width) grading 1,841 g/t Ag, 1.81 per cent Pb and 1.31 per cent Zn within vein T33 on the 960 m level.
- Drift tunnel PD846-T11E-846-10SYM exposed mineralization 110 m long and 0.68 m wide (true width) grading 427 g/t Ag, 2.26 per cent Pb and 0.44 per cent Zn within vein T11E on the 858 m level.
SELECTED MINERALIZED ZONES EXPOSED BY DRIFT TUNNELLING AT THE TLP MINE
Tunnel ID Vein Ore length True width Ag Pb Zn
(m) (m) (g/t) (%) (%)
PD846-T11E-846-10SYM T11E 80.00 0.68 427 2.26 0.44
PD930-T15W-930-12NYM T15W 15.00 0.58 485 3.59 0.35
PD930-T15W-930-12SYM T15W 55.00 0.56 188 2.20 0.23
PD820-T15W1-700-4SYM T15W1 70.00 0.61 84 5.17 0.22
PD820-T15W3-795-8NYM3 T15W2 20.00 0.45 172 5.51 0.68
PD820-T15W3-755-8NYM T15W2 15.00 0.62 359 5.72 1.05
PD960-T16E-960-1SYM T16E 45.00 0.30 494 2.46 2.02
PD890-T16E-890-2NYM T16E 85.00 0.64 721 2.62 0.72
PD820-T17W-700-14SYMA T17 20.00 0.92 153 8.27 0.12
PD730-T1W1-700-13NYM T1W1 15.00 0.36 78 3.09 0.67
PD820-T22E-700-16NYM T22E 20.00 0.81 692 3.43 1.05
PD960-T33-990-13NYM T33 20.00 0.44 1,841 1.81 1.31
PD890-T33-890-23NYM T33 30.00 0.60 261 1.22 0.13
PD730-T33W2-700-15NYM T33W2 15.00 0.34 14 6.04 0.06
PD800-T39E2-800-23NYM T39E2 45.00 0.48 173 2.07 0.95
PD820XPD-T39E2-700-25NYM T39E2 15.00 0.59 82 3.02 0.88
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 the analytical lab of the Inner Mongolia Geological Exploration Bureau in Hohhot, inner Mongolia, China. All the three labs are International Organization for Standardization 9000-certified analytical labs. For analysis, the sample is dried and crushed to minus on 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 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 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, 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, employee well-being, and sustainable development.
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