VANCOUVER, BRITISH COLUMBIA--(Marketwired - April 15, 2013) - Silvercorp Metals Inc. ("Silvercorp" or the "Company") (TSX:SVM)(NYSE:SVM) is pleased to report the results from its 2012 underground diamond drilling and tunneling exploration programs for the second half of 2012 at the TLP mine, Ying Mining District, Henan Province, China.
Highlights of selected intercepts in drill holes:
- Hole ZKT0331 intercepted an interval of 1.91 metres ("m"), 1.28m true width of vein T33 grading 1,669 grams per tonne ("g/t") silver ("Ag"), 0.82% lead ("Pb") and 0.29% zinc ("Zn") at the 877m elevation; and an interval of 1.11m, 0.74m true width of vein T33E grading 115 g/t Ag, 0.46% Pb and 0.03% Zn at the 771m elevation;
- Hole ZKT1731 intercepted an interval of 1.54m, 1.19m true width of vein T33E grading 1,016 g/t Ag, 5.48% Pb and 0.80% Zn at the 922m elevation;
- Hole ZKG0404 intercepted an interval of 3.58m, 2.57m true width of vein T16E grading 233 g/t Ag, 1.95% Pb and 0.60% Zn at the 838m elevation, including an interval of 0.90m, 0.65m true width grading 702 g/t Ag, 6.77% Pb and 1.94% Zn; and an interval of 1.67m, 1.22m true width of vein T11 grading 1,023 g/t Ag, 6.18% Pb and 0.96% Zn at the 553m elevation;
- Hole ZKG0621 intercepted four veins: an interval of 1.07m, 1.04m true width of vein T16E grading 669 g/t Ag, 0.97% Pb and 0.12% Zn at the 838m elevation, an interval of 1.13m, 1.10m true width of vein T16E2 grading 449 g/t Ag, 3.16% Pb and 0.30% Zn at the 806m elevation, an interval of 0.81m, 0.79m true width of vein T15W1 grading 221 g/t Ag, 0.98% Pb and 0.13% Zn at the 799m elevation, and an interval of 1.09m, 1.06m true width of vein T11 grading 320 g/t Ag, 0.93% Pb and 1.03% Zn at the 729m elevation; and
- Hole ZKG0622 intercepted three veins: an interval of 1.27m, 1.12m true width of vein T16E grading 909 g/t Ag, 5.35% Pb and 0.49% Zn at the 837m elevation, an interval of 1.59m, 1.26m true width of vein T15W1 grading 348 g/t Ag, 4.02% Pb and 0.19% Zn at the 770m elevation, and an interval of 1.52m, 1.35m true width of vein T15 grading 1,150 g/t Ag, 2.18% Pb and 0.10% Zn at the 717m elevation.
The purpose of the 11,916m underground tunneling program in 2012 was to further delineate and upgrade the previous drill-defined resource blocks within major vein structures T1, T1W, T1W1, T1W3, T2, T3, T16, T16W, T22, T33 and T34 between the 510m and the 990m elevations. Drift and crosscut tunnels have been developed at 30m to 50m intervals. A total of 5,619 chip samples were collected. Mineralized zones were exposed in drift tunnels on different levels along the major vein structures.
The 2012 underground diamond drilling program was designed to test the downdip and strike extension of the major mineralized vein structures and to explore for new vein structures. A total of 23,709m in 73 holes was completed and 3,336 core samples were collected. Assay results for 22 holes were received by the end of June 2012 and were reported by the Company on August 27, 2012 via news release.
In the second half of 2012, the Company revised its underground drilling strategy. Instead of focusing on step out drilling at depths below the current mining depth, the Company tested the lateral extensions by conducting in-fill and step-out drilling at shallow depth on the upper portions of the major production vein structures at or above the 700m elevation. As previously reported via news release on February 13, 2013, this strategy has been successful in defining additional high grade mineralization of production veins and discovered several new veins at shallow depth where mine development exits. As of March 10, 2013, assay results for 51 holes had been received. 44 of the 51 holes with new assay results intercepted single or multiple mineralized zones.
Seven new mineralized vein structures, T23, T33W3, T41, T16E1, T16E2, T15W and T15W1 were also discovered as a result of the 2012 underground tunneling and diamond drilling program. A summary of these new vein structures is as follows:
- Vein structure T15W: T15W is located 10m to 30m parallel to the west of vein T15 and the discovery was made by underground drilling from access tunnel PD820 at the 820m elevation. The mineralized vein structure has been intercepted between the 649m and 796m elevations by 6 holes drilled between exploration lines 4 and 6.
- Vein structure T15W1: T15W1 is located 40m to 70m parallel to the west of vein T15 and the discovery was made by underground drilling. The mineralized vein structure has been intercepted between the 696m and 808m elevations by 6 holes drilled between exploration lines 4 and 6.
- Vein structure T16E1: T16E1 is located 50m to 70m parallel to the east of vein T16. The mineralized vein structure has been intercepted between the 765m and 828m elevations by 6 holes drilled between exploration lines 4 and 6.
- Vein structure T16E2: T16E2 is located 80m to 90m parallel to the east of vein T16. The mineralized vein structure has been intercepted between the 735m and 814m elevations by 6 holes drilled between exploration lines 4 and 6.
- Vein structure T23: T23 is located 120m parallel to the east of vein T33. Mineralized zones have been intersected by drifting along the vein developed on the 930m, 890m and 840m levels between exploration lines 5 and 11.
- Vein structure T33W3: T33W3 is located 100m to 120m parallel to the west of T33, which was intersected by drifting along the vein at the 800m level. A zone of mineralization 105m in length has been defined.
- Vein structure T41: T41 is located 30m to 40m to the west of vein T27 and was intersected by a drift tunnel developed on the 930m level. A zone of mineralization 40m in length within the vein has been defined.
Tables 1 and 2 below list the assay results of some selected mineralized zones that were exposed in tunnels and via drilling.
In 2013 Silvercorp has planned an exploration and resource development program at the TLP mine consisting of 9,790m of underground tunneling and 14,500m of underground drilling. The goals of the program are: infill drilling of previously defined resource blocks at shallower depths; exploration along strike (lateral) and up dip (shallower) of the extensions of major producing veins; and exploration for parallel vein structures in the hanging wall and footwall of known mineralized veins. Where possible, the program will take advantage of existing underground mine development to access new discoveries and will drive new tunnels as required to provide drill stations in prospective areas beyond the reach of existing mine workings.
| Table 1: Selected tunneling results from the TLP Mine | ||||||||
| Tunnel ID | Elevation (m) | Length of Mineralized Zone (m) | Vein | Weighted Average | ||||
| Horizontal Width (m) | True Width (m) | Ag (g/t) | Pb (%) | Zn (%) | ||||
| PD840-840-T1W3-7SYM | 840 | 40 | T1W3 | 0.52 | 0.48 | 451 | 1.36 | 0.03 |
| PD820-798-T16W-12NYM&12SYM | 798 | 55 | T16W | 0.60 | 0.56 | 216 | 0.71 | 0.39 |
| PD730-730-T34-23NYM | 730 | 65 | T34 | 0.59 | 0.54 | 147 | 4.42 | 0.27 |
| PD840-874-T14-21TJ-NYM&SYM | 874 | 55 | T14 | 0.60 | 0.55 | 201 | 1.84 | 0.32 |
| PD820-820-T16-10SYM | 820 | 60 | T16 | 0.44 | 0.42 | 176 | 1.41 | 0.30 |
| PD960-960-T22-0SYM | 960 | 49 | T22 | 0.86 | 0.84 | 211 | 4.95 | 0.12 |
| PD930-930-?àáW3-5SYM&NYM | 930 | 80 | T23 | 0.51 | 0.46 | 184 | 2.03 | 0.22 |
| PD890-890-T23-11SYM | 890 | 145 | T23 | 0.75 | 0.68 | 264 | 5.04 | 0.11 |
| PD840-840-T23-7NYM | 840 | 64 | T23 | 0.69 | 0.62 | 214 | 4.80 | 0.22 |
| PD930-930-T33-13SYM | 930 | 245 | T33 | 0.79 | 0.73 | 338 | 1.80 | 0.28 |
| PD930-930-T33Branch-11SYM&NYM | 930 | 189 | T33 | 0.91 | 0.84 | 567 | 0.67 | 0.15 |
| PD800-800-T33W3-19SYM&NYM | 800 | 105 | T33W3 | 0.43 | 0.41 | 295 | 2.67 | 0.56 |
| PD820-691-T16-6SYM | 691 | 65 | T16 | 0.64 | 0.61 | 253 | 3.40 | 0.13 |
| Table 2: Selected drilling results from the TLP Mine | ||||||||||
| Hole ID | From (m) | To (m) | Elevation (m) | Interval (m) | True Width (m) | Ag (g/t) | Pb (%) | Zn (%) | Mineralized Vein | |
| ZKG0805 | 226.42 | 227.07 | 759 | 0.65 | 0.62 | 178 | 0.64 | 0.14 | T16E | |
| ?ÇÇ | 277.68 | 278.1 | 741 | 0.42 | 0.40 | 192 | 1.00 | 0.13 | T15-Branch | |
| ?ÇÇ | 289.78 | 290.21 | 737 | 0.43 | 0.41 | 1,544 | 1.48 | 0.66 | T15 | |
| ZKT0232 | 79.63 | 84.29 | 841 | 4.66 | 3.92 | 187 | 3.03 | 0.28 | T1W1 | |
| ZKT0054 | 329.44 | 330.58 | 691 | 1.14 | 0.95 | 149 | 0.32 | 0.18 | T17W | |
| ?ÇÇ | 437.47 | 438.69 | 602 | 1.22 | 0.56 | 440 | 3.61 | 0.20 | T17 | |
| ZKG1004 | 180.01 | 181.17 | 698 | 1.16 | 0.78 | 679 | 3.16 | 0.70 | T16W | |
| ?ÇÇ | 223.44 | 224.01 | 665 | 0.57 | 0.47 | 4,534 | 4.07 | 0.26 | T16 | |
| ?ÇÇ | 433.51 | 433.75 | 508 | 0.24 | 0.22 | 258 | 0.14 | 0.04 | T11E | |
| ZKT0003 | 366.78 | 367.61 | 473 | 0.83 | 0.58 | 1,052 | 1.05 | 0.02 | T3 | |
| ZKG0401 | 1.13 | 1.58 | 838 | 0.45 | 0.39 | 967 | 4.61 | 0.26 | T16E | |
| ?ÇÇ | 29.01 | 29.52 | 828 | 0.51 | 0.44 | 235 | 5.90 | 0.13 | T16E1 | |
| ?ÇÇ | 72.61 | 73.86 | 812 | 1.25 | 1.07 | 233 | 4.80 | 0.12 | T15W1-Branch | |
| ?ÇÇ | 85.58 | 85.95 | 808 | 0.37 | 0.32 | 42 | 13.87 | 0.46 | T15W1 | |
| ?ÇÇ | 117.41 | 118.37 | 796 | 0.96 | 0.82 | 211 | 3.80 | 0.46 | T15W | |
| ZKT0331 | 19.93 | 21.84 | 877 | 1.91 | 1.28 | 1,669 | 0.82 | 0.29 | T33 | |
| ?ÇÇ | 174.05 | 175.16 | 771 | 1.11 | 0.74 | 115 | 0.46 | 0.03 | T33E | |
| ZKG1005 | 175.15 | 177.72 | 678 | 2.57 | 0.73 | 120 | 1.25 | 0.20 | T17 | |
| ?ÇÇ | 230.18 | 232.14 | 630 | 1.96 | 1.31 | 176 | 1.20 | 0.20 | T16W | |
| ?ÇÇ | 469.02 | 469.78 | 418 | 0.76 | 0.58 | 158 | 11.25 | 4.85 | T11E | |
| ZKG1801 | 140.97 | 141.91 | 747 | 0.94 | 0.81 | 284 | 0.45 | 0.36 | ?ÇÇ | |
| ZKG0402 | 0.68 | 1.71 | 838 | 1.03 | 0.90 | 411 | 0.66 | 0.08 | T16E | |
| ?ÇÇ | 92.24 | 92.91 | 779 | 0.67 |
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