Significant high-grade intercepts from the latest drill results include:
In-mine and near-mine drilling
- Sandra K: 40.39 g/t Au and 42.4 g/t Ag over 0.41 meters on the Sandra K Techo FW Vein (SK-ES-027);
- Sandra K: 159.88 g/t Au and 248.0 g/t Ag over 0.30 meters on the Sandra K Techo Vein (SK-IU-200);
El Silencio : 38.41 g/t Au and 28.6 g/t Ag over 0.68 meters on the Manto Vein (ES-EU-028A);El Silencio : 236.44 g/t Au and 123.6 g/t Ag over 0.60 meters on the Nacional Vein (ES-MH08-13);- Carla: 254.30 g/t Au and 316.7 g/t Ag over 0.45 meters on the La
Gran Colombia Vein (CA-ES-036).
Brownfield drilling
- Marmajito: 131.10 g/t Au and 294.3 g/t Ag over 0.32 meters on the Marmajito Vein. (MAR-EU-015);
- La Guarida-Cristales Trend: 56.88 g/t Au and 41.0 g/t Ag over 0.39 meters on the La Guarida-Cristales Trend (CR-ES-025).
The 2021 in-mine and near-mine infill and step-out drilling programs commenced in
The 2021 brownfield drilling campaign, which focused on exploration for new resources at the brownfield exploration targets on the 24 veins within the
GCM Mining’s 2022 diamond drilling campaign will comprise approximately 91,000 meters with up to 52,000 meters of in-mine and near-mine drilling and 15,000 meters of underground in-fill drilling at its four producing mines together with 24,000 meters of brownfield drilling at its high-priority targets within the other 24 known veins it is not currently mining in its
In-mine and near-mine drilling
- Three rigs are carrying out resource definition in the
Sandra K Mine from two purpose-built surface platforms and one underground drill station in theSandra K Mine ; and, - Two rigs are carrying out resource definition on the
El Silencio Deep Zone from a purpose-built underground drill station in theEl Silencio Mine to test the 450 Vein from the Lejanias sector, and from a purpose-built underground drill station on Level 3 of theSandra K Mine conducting directional infill drilling on the southern ore-shoot below Level 38.
Underground In-fill drilling
- Three rigs at El Silencio; and
- One rig at Sandra K.
Brownfield drilling
- Two rigs are operating from surface on the La Guarida-Cristales Trend;
- One rig is operating from an exploration ramp starting from Level 15 of the
Providencia Mine testing the Marmajito Vein; and - One rig is operating from surface at Vera testing the northeastern extension of the vein system and a soil silver anomaly.
Key Highlights
IN-MINE and NEAR-
Sandra K
In-mine infill drilling from underground station SK5680, installed off Level 6, was still ongoing at the end of 2021. This program has further extended down-plunge, to approximately future Level 9, an ore-shoot outlined by previous drilling, which occurs in the northern fault block of the Sandra K Vein System delimited by a set of faults striking NE and steeply dipping to the north related to the Lejanias Fault System. This ore-shoot remains open at depth. Multiple high gold grades were intersected in 12 drill holes (total of 1,747 meters) on the main vein system with maximum intersection grades of 159.88 g/t Au with 248.0 g/t Ag over 0.30 meters on the Sandra K Techo Vein (SK-IU-200). The high-grade gold mineralized intercepts encountered confirm the higher-grade mineralization at depth.
Surface exploration drilling from platform SK6020, located in the northern fault block of the main vein system, was still ongoing at the end of 2021. This program was designed on a 150 m x 150 m drill spacing and was aimed to extend down-dip the main vein system from future Level 9 to Level 15 and along strike. Drilling was successful in extending the main vein system along strike by 150 meters and down-dip. Medium to high gold grades were intersected from 7 drill holes (total of 3,477 meters) on the main vein system with maximum intersection grades of 40.39 g/t Au with 42.4 g/t Ag over 0.41 meters on the Sandra K Techo Vein (SK-ES-027).
In-mine exploration drilling from underground station ES4170, installed off Level 15 of the Providencia mine, was designed on a 125 m x 125 m drill spacing to test the continuity of the Nacional Vein from future Level 40 to Level 42 in the southernmost sector of
Additional in-mine exploration drilling from underground station ES5110, installed on Level 38, was completed. The aim of this program was to confirm the extension of the 450 Vein close to the mine workings on the Nacional Vein. The 450 Vein, discovered by directional drilling in 2020, is interpreted as a low angle vein or manto that occurs in the hanging-wall of the Nacional Vein, some 40 meters vertically above. Drilling was successful in demonstrating the extension as well as high grades. Multiple high gold grades were intersected from 9 drill holes (total of 1,236 meters) with maximum intersection grades of 50.77 g/t Au with 79.4 g/t Ag over 0.55 meters (ES-EU-037).
The ongoing directional drilling program on the
Carla
Infill drilling from platform CA4850 was designed to test the La Gran Colombia Vein System in the
Marmajito
The brownfield exploration drilling program on the Marmajito Vein, which commenced in
La Guarida-Cristales Trend
This surface exploration drilling program, which commenced in
Surface exploration drilling continued from drill platform CR6940 with 4 drill holes, totaling 630 meters, designed to test the northeastern extension of the La Guarida Vein beyond the known ore-shoot. Drill hole CR-ES-031A was successful in intersecting two veins corresponding to La Guarida Vein and the SW extension of the Cristales Vein, which occurs in the footwall of the La Guarida Vein, with maximum intersection grades of 5.07 g/t Au with 5.2 g/t Ag over 0.31 meters on the La Guarida Vein and 8.24 g/t Au with 13.3 g/t Ag over 0.37 meters on the Cristales Vein (CR-EU-031A).
Surface exploration drilling from drill platform CR6850 was designed to start testing the extension of the Cristales Vein between the La Guarida and Cristales mines. A total of 5 drill holes, totaling 1,220 meters, were completed with maximum intersection grades of 18.52 g/t Au with 24.9 g/t Ag over 0.68 meters on the Cristales Vein (CR-EU-024).
Additional surface exploration drilling was designed from drill platform CR7370 aimed to test the down-plunge extension of the ore-shoot at the northeast-most end of the
The following table lists the key intercepts from the final 2021 in-mine, near-mine and brownfield drilling programs that were received since the press release issued on
In-Mine and Near-Mine Drill Program
Hole | From (m) | To (m) | Width (m) | Au (g/t) | Ag (g/t) | Vein | ||||
SANDRA K MINE | ||||||||||
Surface Drilling station SK6020 | ||||||||||
SK-ES-027 | 384.72 | 385.13 | 0.41 | 40.39 | 42.4 | SKT-FW | ||||
SK-ES-030 | 454.95 | 455.54 | 0.59 | 8.86 | 109.0 | SKT | ||||
U- | ||||||||||
SK-IU-196* | 84.18 | 85.90 | 1.72 | 2.17 | 10.0 | SKT | ||||
including | 85.49 | 85.90 | 0.41 | 8.59 | 34.2 | SKT | ||||
SK-IU-197* | 126.44 | 126.86 | 0.42 | 66.52 | 133.5 | SKT | ||||
SK-IU-198* | 99.10 | 102.00 | 2.90 | 5.11 | 10.1 | SKT | ||||
including | 100.68 | 101.07 | 0.39 | 16.69 | 29.4 | SKT | ||||
SK-IU-199* | 124.60 | 126.61 | 2.01 | 3.87 | 12.2 | SKT | ||||
including | 125.85 | 126.61 | 0.76 | 9.62 | 26.5 | SKT | ||||
SK-IU-200* | 95.70 | 99.33 | 3.63 | 14.01 | 33.5 | SKT | ||||
including | 97.51 | 97.81 | 0.30 | 159.88 | 248.0 | SKT | ||||
SK-IU-201* | 144.43 | 148.53 | 4.10 | 2.60 | 4.2 | SKT | ||||
including | 144.43 | 144.73 | 0.30 | 11.28 | 27.6 | SKT | ||||
U- | ||||||||||
ES-EU-028A* | 309.90 | 311.90 | 2.00 | 14.09 | 11.3 | VEM | ||||
including | 309.90 | 310.58 | 0.68 | 38.41 | 28.6 | VEM | ||||
ES-EU-033A* | 348.00 | 348.59 | 0.59 | 6.13 | 8.7 | NAL-HW | ||||
U- | ||||||||||
ES-EU-031* | 54.59 | 55.65 | 1.06 | 6.85 | 10.6 | SNO | ||||
including | 55.12 | 55.65 | 0.53 | 13.46 | 21.0 | SNO | ||||
ES-EU-037* | 132.52 | 137.20 | 4.68 | 4.90 | 7.0 | SNO | ||||
including | 133.14 | 134.00 | 0.86 | 19.62 | 25.6 | SNO | ||||
ES-EU-037* | 142.28 | 150.54 | 8.26 | ]5.69 | 15.9 | 450 | ||||
including | 149.49 | 150.04 | 0.55 | 50.77 | 79.4 | 450 | ||||
ES-EU-038* | 173.45 | 177.37 | 3.92 | 4.60 | 3.3 | 450 | ||||
including | 175.05 | 175.55 | 0.50 | 26.55 | 10.0 | 450 | ||||
El SILENCIO DEEP - DIRECTIONAL DRILLING | ||||||||||
U- | ||||||||||
ES-MH08-13** | 1068.08 | 1069.73 | 1.65 | 89.73 | 48.4 | NAL | ||||
including | 1068.60 | 1069.20 | 0.60 | 236.44 | 123.0 | NAL | ||||
ES-MH08-13** | 1072.66 | 1073.37 | 0.71 | 16.84 | 38.4 | VEM | ||||
Surface Drilling station CA4850 | ||||||||||
CA-ES-036 | 221.75 | 223.83 | 2.08 | 56.59 | 77.5 | LGC | ||||
including | 221.75 | 222.20 | 0.45 | 254.30 | 316.7 | LGC | ||||
Brownfield Drill Program | ||||||||||
MARMAJITO VEIN | ||||||||||
U- | ||||||||||
Hole | From (m) | To (m) | Width (m) | Au (g/t) | Ag (g/t) | Vein | ||||
MAR-EU-013* | 240.91 | 241.25 | 0.34 | 18.69 | 10.5 | MAR | ||||
MAR-EU-014* | 276.70 | 277.10 | 0.40 | 19.70 | 24.6 | MAR | ||||
MAR-EU-015* | 11.75 | 12.10 | 0.35 | 41.30 | 76.4 | SNO | ||||
MAR-EU-015* | 317.20 | 318.05 | 0.85 | 52.35 | 117.6 | MAR | ||||
including | 317.20 | 317.52 | 0.32 | 131.10 | 294.3 | MAR | ||||
LA GUARIDA-CRISTALES TREND | ||||||||||
Surface Drilling station CR7370 | ||||||||||
CR-ES-023 | 310.78 | 311.70 | 0.92 | 6.10 | 6.4 | CRI-FW | ||||
including | 310.78 | 311.38 | 0.60 | 9.24 | 9.4 | CRI-FW | ||||
CR-ES-025 | 206.56 | 206.95 | 0.39 | 56.88 | 41.0 | SNO | ||||
Surface Drilling station CR6850 | ||||||||||
CR-ES-024 | 185.72 | 186.40 | 0.68 | 18.52 | 24.9 | CR | ||||
Surface Drilling station CR6940 | ||||||||||
CR-ES-031A | 182.57 | 182.94 | 0.37 | 8.24 | 13.3 | CR |
* Denotes underground drill holes. The underground in-fill holes were drilled at +12 to -73 degrees from the horizontal. Sample interval grades over 7.0 g/t Au are reported. Grades are for quartz vein intersections and are length-weighted composites. The width is the sample length and is not necessarily the true width of the vein. All gold and silver grades are uncut and are not diluted to a minimum mining width.
** Denotes directional drilling mother and kick-off holes. The directional drilling kick-off holes were drilled at -55 to -61 degrees from the horizontal. Sample interval grades over 7.0 g/t Au are reported.
Vein name abbreviations: SKT: Sandra K Techo Vein. SKT-FW: Sandra K Techo Footwall Vein. VEM: Manto Vein. NAL-HW: Nacional Hanging-wall Vein. 450: 450 Vein. NAL: Nacional Vein. LGC: La
Results from in-mine exploration and infill drilling are reported for 25 holes (3,728 m) including: 12 holes (1,747 m) at Sandra K (SK-IU-195 to SK-IU-206); 1 hole (134.9 m) at Chumeca (CH-IU-038) and 12 holes (1,846 m) at El Silencio (ES-EU-028A and ES-EU-031 to ES -EU-039) of which two were lost. There are no results above cut-off grade for 6 holes at Sandra K, 1 hole at Chumeca and 7 holes at El Silencio, so these holes are not listed in the table.
Results from near-mine surface exploration drilling are reported for 14 holes (5,430 m) including: 8 holes (4,062 m) at Sandra K (SK-ES-024 to SK-ES-031) and 6 holes (1,368 m) at Carla (CA-ES-030A to CA-ES-031A to CA-ES-036) of which one was lost. There are no results above cut-off grade for 12 holes at Sandra K and 11 holes at Carla, so these holes are not listed in the table.
Results from brownfield exploration drilling are reported for 27 holes (7,125 m) including: 3 holes (1,133 m) at Vera (VER-ES-026 to VER-ES-028); 3 holes (918 m) at Marmajito (MAR-EU-013 to MAR-EU-015) and 21 holes (5,074 m) on the La Guarida-Cristales Trend (CR-ES-016 to CR-ES-033) of which three were lost. There are no results above cut-off grade for 3 holes at Vera and 17 holes on La Guarida-Cristales Trend, so these holes are not listed in the table.
Results from directional drilling from one purpose-built station on Level 3 at Sandra K are reported from 2 kick-off holes (ES-MH08-12 to ES-MH08-13), totaling 1,140 meters, all drilled on the southern ore-shoot. There are no results above cut-off grade for 1 hole, so this hole is not listed in the table.
Please refer also to the attached illustrative maps showing the Sandra K,
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This news release contains "forward-looking information", which may include, but is not limited to, statements with respect to anticipated business plans or strategies, including exploration programs and mineral resources and reserves. Often, but not always, forward-looking statements can be identified by the use of words such as "plans", "expects", "is expected", "budget", "scheduled", "estimates", "forecasts", "intends", "anticipates", or "believes" or variations (including negative variations) of such words and phrases, or state that certain actions, events or results "may", "could", "would", "might" or "will" be taken, occur or be achieved. Forward-looking statements involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of
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Attachment 1 – Sandra K Mine Infill and Exploration Drilling Grade Intercepts
https://www.globenewswire.com/NewsRoom/AttachmentNg/d10184bb-af69-4154-991e-fb6dc3860b2d
Attachment 2 – Cross section of the Sandra K Vein System
https://www.globenewswire.com/NewsRoom/AttachmentNg/b11dec07-d9a5-4a06-b809-b432ec895022
Attachment 3 –
https://www.globenewswire.com/NewsRoom/AttachmentNg/19b4decc-b08c-47d0-aae6-9a7669d6c153
Attachment 4 –
https://www.globenewswire.com/NewsRoom/AttachmentNg/790fbf3f-322a-44b9-9e6c-7150bb6d48cb
Attachment 5 – Cross section of the El Silencio Deep Vein System
https://www.globenewswire.com/NewsRoom/AttachmentNg/d304f7b7-df5c-43ce-bea1-30e8fd417436
Attachment 6 – La Gran Colombia Vein System Infill Drilling Grade Intercepts
https://www.globenewswire.com/NewsRoom/AttachmentNg/a22f0485-7ad5-4d5d-94de-ea148beb28e8
Attachment 7 – Cross section of the La Gran Colombia Vein System
https://www.globenewswire.com/NewsRoom/AttachmentNg/9910c40d-f9b6-497c-b2d9-94d60e22fd7d
Attachment 8 – Providencia Mine Exploration Drilling Grade Intercepts for the Marmajito Vein
https://www.globenewswire.com/NewsRoom/AttachmentNg/6669380e-b0e5-434d-ad3b-8a4eb663423f
Attachment 9 – Cross section of the Marmajito Vein
https://www.globenewswire.com/NewsRoom/AttachmentNg/05a04207-7514-4b14-a9f0-1a473f7fc7f6
Attachment 10 – La Guarida-Cristales Trend Exploration Drilling Grade Intercepts
https://www.globenewswire.com/NewsRoom/AttachmentNg/2748e100-64c2-4748-92d9-2cbaed0baba8
Attachment 11 – Cross section of La Guarida-Cristales Trend
https://www.globenewswire.com/NewsRoom/AttachmentNg/7c73bfa5-633e-4722-bdc6-e5b3d5abdaca
Attachment 1
Sandra K Mine Infill and Exploration Drilling Grade Intercepts
Attachment 2
Cross section of the Sandra K Vein System
Attachment 3
El Silencio Mine (southern side) Infill Drilling Grade Intercepts for the 450 Vein
Attachment 4
El Silencio Mine (southernmost side) Exploration Drilling Grade Intercepts for the Nacional Vein
Attachment 5
Cross section of the El Silencio Deep Vein System
Attachment 6
La Gran Colombia Vein System Infill Drilling Grade Intercepts
Attachment 7
Cross section of the La Gran Colombia Vein System
Attachment 8
Providencia Mine Exploration Drilling Grade Intercepts for the Marmajito Vein
Attachment 9
Cross section of the Marmajito Vein
Attachment 10
La Guarida-Cristales Trend Exploration Drilling Grade Intercepts
Attachment 11
Cross section of La Guarida-Cristales Trend
2022 GlobeNewswire, Inc., source