Endeavour Silver Intersects High-Grade Silver and Gold Mineralization at its Terronera Operation
Endeavour Silver Intersects High-Grade Silver and Gold Mineralization at its
Terronera Operation
VANCOUVER, British Columbia, June 18, 2026 -- Endeavour Silver Corp. (“Endeavour” or the “Company”) (TSX:
EDR, NYSE: EXK) is pleased to announce positive drill results from its exploration program at its newest mine, Terronera,
located in Jalisco, Mexico.
Since 2025, the Company has completed 43 drill holes totaling 7,015 metres on the La Luz system and 10 drill holes totaling
1,904 metres targeting the Terronera vein. This marks the first exploration drilling campaign at the Terronera mine since 2020.
The program is designed to expand and better define mineralization along strike and at depth within the Terronera vein system.
At La Luz, drilling has focused on defining the limits of mineralization adjacent to historical workings and testing the down-dip
extension of the system to support mine design and long-term planning. Key highlights from this program include:
• LL-43: 574 g/t Ag, 23.92 g/t Au for 2,607 g/t AgEq over 1.06 metres true width
• LL-77: 1,271 g/t Ag, 0.81 g/t Au for 1,340 g/t AgEq over 0.94 metres true width
• TRU-001: 282 g/t Ag, 1.80 g/t Au for 435 g//t AgEq over 8.11 metres true width
• TRU-003: 150 g/t Ag, 6.30 g/t Au for 686 g/t AgEq over 5.32 metres true width
“These results demonstrate the exploration potential that exists beyond the current Terronera mine plan," said Luis Castro,
Chief Operating Officer. “At both Terronera and La Luz, drilling has successfully extended mineralization along strike and at
depth while supporting the continuity of high-grade silver and gold zones. By advancing mine development, we are better
positioned to establish underground drill platforms that allow us to efficiently test priority targets and quickly improve our
understanding of the district vein systems. We believe these results highlight the opportunity to grow resources, extend mine
life and unlock additional value across the broader Terronera property.”
At La Luz, drilling highlights were holes LL-43 LL-77 which underscore the presence of high-grade precious metal
mineralization. Holes LL-68, LL-69, LL-75, LL-76, L-77 are all below the published resource extending mineralization along
strike and to depth, which continues to remain open. La Luz holes were drilled from 500 metres of the access ramp developed
in 2025. The program is designed to better define historical workings to improve the mine design of the La Luz deposit.
Management expects the mining of the high grade La Luz deposit will commence in 2027 through a combination of long hole
and cut and fill mining methods.
Drilling of the Terronera structure continues to return high-grade mineralization, highlighted by hole TRU-001 and hole TRU-003.
These results support the presence of robust mineralized zones with both strong grades and meaningful widths, further
supporting the continuity and quality of mineralization within the Terronera system. The Terronera holes extend mineralized
vein continuity along strike and to depth. TRU-006 is the deepest high-grade intercept in this zone, while TRU-10 demonstrates
the structure continues at depth. Terronera remains open along strike and at depth.
Two drill rigs are currently operating at Terronera and are expected to continue testing the extension of mineralization along
strike and at depth through the middle of the fourth quarter. The program is designed to further define the continuity and
potential expansion of the Terronera vein system, supporting future resource growth and mine planning initiatives.
Table 1. La Luz Drill Results
Hole Structure From To Core
Length
True
Width Au Ag AgEq
(m) (m) (m) (m) (gpt) (gpt) (gpt)
LL-43 La Luz 104.10 105.40 1.30 1.06 23.92 574 2,607
Including 104.70 105.40 0.70 0.57 44.40 1,060 4,834
LL-44 La Luz 120.10 123.05 2.95 2.26 3.84 176 503
Including 122.60 123.05 0.45 0.34 18.15 817 2,360
LL-48 La Luz 124.85 126.40 1.55 0.95 1.08 8 100
Including 125.55 126.40 0.85 0.52 1.93 10 173
LL-49 La Luz 77.00 78.35 1.35 1.3 3.43 579 871
Including 77.00 78.00 1.00 0.93 4.47 741 1,121
LL-50 La Luz 78.00 79.25 1.25 1.20 0.47 80 120
Including 78.00 78.60 0.60 0.57 0.86 123 196
LL-51 La Luz 139.10 141.25 2.15 0.94 1.99 27 196
Including 140.60 141.25 0.65 0.28 3.75 41 360
LL-52 La Luz 151.35 153.55 2.20 1.13 15.86 55 1,404
Including 152.65 153.55 0.90 0.46 18.40 76 1,640
LL-55 La Luz 84.50 86.10 1.60 1.31 1.66 19 160
Including 85.15 86.10 0.95 0.78 2.77 30 266
LL-59 La Luz 135.10 137.40 2.30 2.12 7.47 378 1,013
Including 135.10 135.85 0.75 0.69 17.90 440 1,962
LL-61 La Luz 138.00 140.20 2.20 2.07 0.65 93 148
Including 139.75 140.20 0.45 0.42 0.53 233 278
LL-63 La Luz 155.65 156.60 0.95 0.86 0.65 426 481
Including 155.65 156.00 0.35 0.32 1.68 1,145 1,287
LL-67 La Luz 146.80 148.35 1.55 1.37 2.01 115 285
Including 147.00 147.65 0.65 0.57 4.62 224 617
LL-68 La Luz 180.50 182.00 1.50 1.19 1.12 252.8 348
Including 180.50 181.50 1.00 0.79 1.55 330 461
LL-69 La Luz 204.90 206.50 1.60 1.13 0.31 172 198
Including 205.70 206.50 0.80 0.57 0.43 243 280
LL-74 La Luz 130.00 131.70 1.70 1.50 2.41 149.5 354
Including 130.85 131.70 0.85 0.75 3.68 104 417
LL-75 La Luz 174.55 176.45 1.90 1.41 0.36 231 262
Including 174.80 175.60 0.80 0.59 0.44 336 373
LL-76 La Luz 234.00 235.80 1.80 1.14 0.26 195 218
Including 235.15 235.80 0.65 0.41 0.68 512 570
LL-77 La Luz 183.85 185.20 1.35 0.94 0.81 1,271 1,340
Including 183.85 184.45 0.60 0.42 1.80 2,830 2,983
LL-81 La Luz 145.20 146.70 1.50 1.32 0.25 131.5 153
Including 145.20 145.95 0.75 0.66 0.29 155 179
LL-82 La Luz 120.75 121.75 1.00 0.96 0.52 86 129
Including 120.75 121.25 0.50 0.48 0.28 131 155
Abbreviations include: gpt: grams per tonne; Au: gold; Ag: silver; m: metre.
AgEq is calculated using an 85:1 Au:Ag ratio
Drill holes LL-46, LL-47, LL-54, LL-56, LL-57, LL-64, LL-70, LL-71, LL-73, LL-78, LL-79, LL-80, LL-83, and LL-84 returned no
significant results.
9 drill holes LL-42, LL45, LL-53, LL-58, LL-60, LL-62, LL-65, LL-66 and LL-72 intersected historical working as part of the
boundary definition of the La Luz vein.
Longitudinal Section of La Luz Vein (Overlain on Figure 10-5 NI 43-101 Technical Report May 15, 2023)
Table 2. Terronera Drill Results
Hole Structure From To Core
Length
True
Width Au Ag AgEq
(m) (m) (m) (m) (gpt) (gpt) (gpt)
TRU-001 Terronera 121.40 131.55 10.15 8.11 1.80 282 435
Including 122.20 123.50 1.30 1.04 0.49 1290 1,332
TRU-002 Terronera 125.80 132.50 6.70 5.09 2.07 80 256
Including 131.90 132.50 0.60 0.46 3.24 197 472
TRU-003 Terronera 109.20 118.60 9.40 5.32 6.30 150 686
Including 110.20 110.80 0.60 0.34 12.70 240 1,320
TRU-004 Terronera 86.40 92.40 6.00 4.42 4.05 119 463
Including 88.80 89.90 1.10 0.81 9.29 204 994
TRU-005 Terronera 150.25 159.50 9.25 4.20 1.93 216 380
Including 151.45 152.05 0.60 0.27 1.19 924 1,025
TRU-006 Terronera 201.70 208.30 6.60 2.20 3.10 130 393
Including 204.60 205.40 0.80 0.27 14.70 240 1,490
TRU-007 Terronera 182.45 187.30 4.85 1.82 1.33 99 211
Including 182.45 182.75 0.30 0.11 5.02 111 538
TRU-008 Terronera 156.50 161.50 5.00 2.07 5.50 156 624
Including 159.50 160.25 0.75 0.31 14.60 353 1,594
TRU-009 Terronera 147.10 155.90 8.80 4.20 3.41 89 379
Including 147.90 148.70 0.80 0.38 13.50 320 1,468
TRU-010 Terronera 208.20 211.50 3.30 0.99 0.09 14 21
Abbreviations include: gpt: grams per tonne; Au: gold; Ag: silver; m: metre.
AgEq is calculated using an 85:1 Au:Ag ratio
All drill holes in the Terronera vein have been included in the ‘Drill Results’ table.
Figure 2. Longitudinal Section of Terronera Vein (Overlain on Figure 10-4 NI 43-101 Technical Report May 15, 2023)
About Endeavour Silver
Endeavour is a mid-tier silver producer with three operating mines in Mexico and Peru and a robust pipeline of exploration
projects across Mexico, Chile, and the United States. With a proven track record of discovery, development, and responsible
mining, Endeavour is driving organic growth and creating lasting value on its path to becoming a leading senior silver producer.
Qualified Person 1
Dale Mah, P.Geo., Vice President Corporate Development, a qualified person under NI 43-101, has approved the scientific and
technical information contained in this news release.
During 2025, the majority of the drill core samples were shipped to ALS Limited in Zacatecas, Mexico for sample preparation
and then for analysis at the ALS laboratory in North Vancouver; at the end of 2025, the laboratory was changed to SGS
laboratory in Durango, Mexico for sample preparation and analysis. The 2026 campaign has been completely analyzed by
SGS laboratory. The ALS Zacatecas, North Vancouver facilities and SGS laboratory are ISO 9001 and/or ISO/IEC 17025
certified.
A quality control sampling program of reference standards, blanks and duplicates has been instituted to monitor the integrity
of all assay results. All samples are split at the local field office and shipped to ALS and/or SGS laboratories, where they are
dried, crushed, split and 250-gram pulp samples are prepared for analysis. Gold was assayed by 30-gram fire assay with
atomic absorption (“AA”) spectroscopy finish and silver by aqua regia digestion with ICP-AES / ICP-OES finish, over-limits
analyses by fire assay and gravimetric finish.
Contact Information
Allison Pettit
Vice President, Investor Relations
Tel: (604) 685 - 9775
Email: [email protected]
Website: www.edrsilver.com
Cautionary Note Regarding Forward-Looking Statements
This news release contains “forward-looking statements” within the meaning of the United States private securities litigation
reform act of 1995 and “forward-looking information” within the meaning of applicable Canadian securities legislation. Such
forward-looking statements and information herein include but are not limited to statements regarding the Company’s
exploration and drilling plans and programs at Terronera, exploration potential at Terronera, the opportunity to grow resources,
extend mine life and unlock additional value across the Terronera property, mining at La Luz and related timing, Terronera’s
potential to create shareholder value, the opportunity for mineral discovery, the Company’s path to becoming a leading senior
silver producer and the timing and results of various activities. The Company does not intend to and does not assume any
obligation to update such forward-looking statements or information, other than as required by applicable law.
Forward-looking statements or information involve known and unknown risks, uncertainties and other factors that may cause
the actual results, level of activity, production levels, performance or achievements of Endeavour and its operations to be
materially different from those expressed or implied by such statements. Such factors include but are not limited to changes
in production and costs guidance; the ongoing effects of inflation and supply chain issues on mine economics; changes in
national and local governments’ legislation, taxation, controls, regulations and political or economic developments in Peru,
Canada and Mexico; financial risks due to precious metals prices; operating or technical difficulties in mineral exploration,
development and mining activities; risks and hazards of mineral exploration, development and mining; the speculative nature
of mineral exploration and development; risks in obtaining necessary licenses and permits; fluctuations in the prices of silver
and gold, fluctuations in the currency markets (particularly the Peruvian sol, Mexican peso, Chilean peso, Canadian dollar and
U.S. dollar); and challenges to the Company’s title to properties; as well as those factors described in the section “risk
factors” contained in the Company’s most recent form 40F/Annual Information Form filed with the S.E.C. and Canadian
securities regulatory authorities.
Forward-looking statements are based on assumptions management believes to be reasonable, including but not limited to:
the continued operation of the Company’s mining operations, no material adverse change in the market price of commodities,
mining operations will operate and the mining products will be completed in accordance with management’s expectations and
achieve their stated production outcomes, and such other assumptions and factors as set out herein. Although the Company
has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-
looking statements or information, there may be other factors that cause results to be materially different from those
anticipated, described, estimated, assessed or intended. There can be no assurance that any forward-looking statements or
information will prove to be accurate as actual results and future events could differ materially from those anticipated in such
statements or information. Accordingly, readers should not place undue reliance on forward-looking statements or information.
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