Gcm Mining Announces Multiple High-Grade Drill Results from the Final Drill Holes IN Its 2021 IN-MINE and Brownfield Drilling Campaigns at Its Segovia Operations; Success Continues at the Marmajito Vein Including 131.10 G/T Au and
401 BAY STREET, SUITE 2400, PO BOX 15, TORONTO, ONTARIO M5H 2Y4 CANADA
PHONE: 416-360-4653; FAX: 416-603-4653
NEWS RELEASE
GCM MINING ANNOUNCES MULTIPLE HIGH-GRADE DRILL RESULTS FROM THE FINAL DRILL
HOLES IN ITS 2021 IN-MINE AND BROWNFIELD DRILLING CAMPAIGNS AT ITS SEGOVIA
OPERATIONS; SUCCESS CONTINUES AT THE MARMAJITO VEIN INCLUDING 131.10 G/T AU AND
294.3 G/T AG OVER 0.32 METERS
TORONTO, CANADA, Wednesday, March 16, 2022 – GCM Mining Corp. (“GCM Mining” or the
“Company”) (TSX: GCM; OTCQX: TPRFF) announced today multiple high-grade intercepts at its Segovia
Operations from the final 39 diamond drill holes, totaling 9,158 meters, of its 2021 in-mine and near-mine
drilling programs, as well as the final 27 diamond drill holes, totaling 7,125 meters, from its 2021 brownfield
drilling programs. The Company also announced the assay results from 2 additional kick-off diamond drill
holes, totaling 1,140 meters, from the ongoing directional drilling at the El Silencio Deep Zone.
Significant high-grade intercepts from the latest drill results include:
In-mine and near-mine drilling
• Sandra K: 40.39 g/t Au and 4 2.4 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).
Serafino Iacono, Executive Chairman of GCM Mining , commented , “We completed a very robust
exploration campaign at our Segovia Operations in 2021 with a total of approximately 97,000 meters
completed in 444 diamond drill holes at our producing mines and our high-priority brownfield targets. These
drill results will be incorporated in the annual mineral reserve and resource updates that are expected to
be announced later this month. Our Segovia Operations continue to demonstrate their prowess as a world-
class system, both in terms of its size and high grades, as shown by the continued outstanding results from
the 2021 drilling programs. The team's exploration model and understanding of the local vein systems led
to the discovery of the 1040 Vein at the El Silencio Mine in 2021 which has the potential to add substantial
resources and increase the mine life for this operation . Drilling from surface at the Sandra K Mine has
proven the down-plunge extension of the main ore -shoots to well below the deepest level of the mine , as
well as a further strike extension of the main vein system to the north by 150 meters. In addition, brownfield
drilling on the Marmajito Vein has shown multiple high-grade intersections, which reinforce the exploitation
potential of this vein by taking advantage of the proximity of the Providencia Mine’s infrastructure. For 2022,
we have committed to contining our exploration campaign at Segovia with another 91,000 meters of drilling
at our producing mines and high-priority brownfield targets."
The 2021 in -mine and near -mine infill and step -out drilling programs commenced in January 2021 and
focused on replacing the 2021 min e production and on organic growth through resource and reserve
expansion at the Company’s core operating mines. GCM Mining completed a total of 184 drill holes in 2021
totaling 47,735 meters which represented about 119% of plan. The in-mine and near-mine drilling campaign
was complemented by another 196 diamond drill holes totaling 33,471 meters that were completed in 2021
in an ongoing underground in-fill drilling campaign carried out by the Company’s Mine Geology Department,
primarily at the El Silencio Mine, which focused on resource definition within the underground mine
developments.
The 2021 brownfield drilling campaign, which focused on exploration for new resources at the brownfield
exploration targets on the 24 veins within the Segovia mining title that are not currently in production,
commenced in late 2020 at the Vera Project . The 2021 brownfield exploration drilling campaign was
finalized at the end of December 2021 with a total of 64 drill holes totaling 15,924 meters, about 20% less
than planned mainly due to the lengthy administrative processes involved to obtain permission to access
the land where the drilling platforms were built.
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 Segovia mining title.
GCM Mining currently has a total of 13 diamond drill rigs in operation at Segovia as follows:
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 the Sandra K Mine; and,
• Two rigs are carrying out resource definition on the El Silencio Deep Zone from a purpose-built
underground drill station in the El Silencio Mine to test the 450 Vein from the Lejanias sector, and from
a purpose-built underground drill station on Level 3 of the Sandra 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 northe astern extension of the vein system and a
soil silver anomaly.
Key Highlights
IN-MINE and NEAR-MINE DRILLING
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 e xploration drilling from platform SK 6020, 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).
El Silencio
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 El Silencio Mine. Drilling was successf ul in demonstrating
continuity together with high grades. Medium to high gold grades were intersected from 3 drill holes (total
of 610 meters) with maximum intersection grades of 38.41 g/t Au with 28.6 g/t Ag over 0.68 meters (ES-
EU-028A).
Additional in -mine exploration drilling from underground station ES5110, installed o n 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. M ultiple 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 El Silencio Deep Zone is targeted to extend and better
delineate the southern ore-shoot down-plunge below Level 40, the deepest level of historical mining on the
Manto Vein. Drilling on the southern ore -shoot continues to be successful in confirming the high -grade
nature of the Nacional and Manto veins and extending the down -plunge continuity of the southern of the
two distinct high-grade domains, previously combined, on the Manto Vein by 170 meters. A high gold grade
intercept was intersected from kick-off hole ES-MH08-13 (540 meters) with maximum intersection grades
of 236.44 g/t Au with 123.0 g/t Ag over 0.60 meters on the Nacional Vein.
Carla
Infill drilling from platform CA4850 was designed to test the La Gran Colombia Vein System in the Carla
Mine further down-dip to correlate the intersections from this follow up phase of drilling with some high -
grade intercepts encountered in the 2020 drilling phase. To date, it is still difficult to correlate the high-grade
intercepts with the main structures of the La Gran Colombia Vein System interpreted so far that comprises:
the La Gran Colombia Vein (“LGC”), which is a northerly -trending master vein with a continuous strike of
more than 700 meters that has been drilled to a vertical depth of about 250 meters, on which the current
mining operation is being developed at a shallow depth, and an hanging-wall vein (“LGC-HW”) that strikes
and dips sub-parallel and in close proximity to the LGC, which merges into the LGC or dies out at depth. A
high gold grade was intersected from hole CA -ES-036 (398 meters) with maximum intersection grades of
254.30 g/t Au with 316.7 g/t Ag over 0.45 meters on the La Gran Colombia Vein.
BROWNFIELD DRILLING
Marmajito
The brownfield exploration drilling program on the Marmajito Vein , which commenced in February 2021
with one diamond drill rig operating from underground drill station PV5630, installed on the exploration ramp
that starts from Level 15 of the Providencia mine and leads to the western extension of the Marmajito mine
workings, moved to drill station MAR5380, installed off the same exploration ramp. This program was aimed
to follow up a high-grade intercept encountered by drilling from drill station PV5630. Drilling was successful
in extending the vein down-dip by 250 meters. Multiple high gold grades were intersected from 3 drill holes
(918 meters) with maximum intersection grades of 131.10 g/t Au with 294.3 g/t Ag over 0.32 meters on
the Marmajito Vein (MAR-EU-015).
La Guarida-Cristales Trend
This surface exploration drilling program , which commenced in August 2021 with one diamond drill rig
initially operating from drill platform CR6640 , moved to drill platform CR6700 to test the down -plunge
extension of the La Guarida Mine ore-shoot delimited by two NW trending faults . Two drill holes, totaling
455 meters, were completed with maximum intersection grades of 5.42 g/t Au with 21.0 g/t Ag over 0.42
meters on the La Guarida Vein (CR-EU-018).
Surface exploration drilling continued from drill platform CR6 940 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 Crist ales 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 th e down-
plunge extension of the ore -shoot at the northeast -most end of the Cristales Mine. A total of 7 drill holes ,
totaling 1,814 meters, were completed with maximum intersection grades of 56.88 g/t Au with 41.0 g/t Ag
over 0.39 meters on an unknown vein that occurs in the hanging-wall of the Cristales Vein (CR-EU-025).
The following table list s the key intercepts from the final 2021 in-mine, near-mine and brownfield drilling
programs that were received since the press release issued on December 16, 2021.
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-G Drilling station SK5680
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
EL SILENCIO MINE
U-G Drilling station ES4170
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-G Drilling station ES5510
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-G Drilling station ES5690
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
CARLA MINE
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-G Drilling station PV5380
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 Gran Colombia Vein. MAR: Marmajito Vein. CR-FW: Cristales
Footwall Vein. CR: Cristales Vein. SNO: unnamed vein.
Results from in-mine exploration and infill drilling are reported for 25 holes (3,728 m) including: 1 2 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, El Silencio, Carla, Marmajito and
La Guarida-Cristales Trend drilling programs.
Qualified Person
Dr. Stewart D. Redwood, PhD, FIMMM, FGS, Senior Consulting Geologist to the Company, is a qualified
person as defined by National Instrument 43 -101 – Standards of Disclosure or Mineral Projects and
prepared or reviewed the preparation of the scientific and technical information in this press release.
Verification included a review of the quality assurance and quality control samples, and review of the
applicable assay databases and assay certificates.
Quality Assurance and Quality Control
The Segovia samp les were prepared and assayed by SGS Laboratories Ltd (ISO 9001:2008) at their
laboratory in Medellin. Gold was assayed by 30 g fire assay with atomic absorption spectrophotometer
(“AAS”) finish. Samples above the upper detection limit of 10.0 g/t gold were re-assayed by 30 g fire assay
with gravimetric finish. Silver was assayed by aqua regia digestion and AAS finish. Blank, standard and
duplicate samples were routinely inserted and monitored for quality assurance and quality control.
About GCM Mining Corp.
GCM Mining is a mid-tier gold producer with a proven track record of mine building and operating in Latin
America. In Colombia, the Company is the leading high -grade underground gold and silver producer with
several mines in operation at Sego via Operations. Segovia produced 206,000 ounces of gold in 2021. In
Guyana, the Company is advancing its fully funded Toroparu Project, one of the largest undeveloped
gold/copper projects in the Americas, which is expected to commence production of more th an 200,000
ounces of gold annually in 2024. GCM Mining pays a monthly dividend to its shareholders and has equity
interests in Aris Gold Corporation (44%; TSX: ARIS; Colombia – Marmato), Denarius Metals Corp. (27%;
TSX-V: DSLV; Spain – Lomero-Poyatos and C olombia – Guia Antigua, Zancudo) and Western Atlas
Resources Inc. (26%; TSX-V: WA: Nunavut – Meadowbank).
Additional information on GCM Mining can be found on its website at www.gcm-mining.com and by
reviewing its profile on SEDAR at www.sedar.com.
Cautionary Statement on Forward-Looking Information
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" o r "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 GCM Mining to be
materially different from any future re sults, performance or achievements expressed or implied by the
forward-looking statements. Factors that could cause actual results to differ materially from those
anticipated in these forward -looking statements are described under the caption "Risk Factors " in the
Company's Annual Information Form dated as of March 31, 2021 which is available for view on SEDAR at
www.sedar.com. Forward-looking statements contained herein are made as of the date of this press release
and GCM Mining disclaims, other than as r equired by law, any obligation to update any forward -looking
statements whether as a result of new information, results, future events, circumstances, or if
management's estimates or opinions should change, or otherwise. There can be no assurance that forward-
looking statements will prove to be accurate, as actual results and future events could differ materially from
those anticipated in such statements. Accordingly, the reader is cautioned not to place undue reliance on
forward-looking statements.
For Further Information, Contact:
Mike Davies
Chief Financial Officer
(416) 360-4653
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