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High-grade Terronera drill results for Endeavour Silver (NYSE: EXK)

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6-K

Rhea-AI Filing Summary

Endeavour Silver reports new exploration drilling results from its Terronera operation in Jalisco, Mexico, focused on the Terronera vein and the nearby La Luz system. Since 2025, the company has completed 43 drill holes totaling 7,015 metres at La Luz and 10 drill holes totaling 1,904 metres at Terronera.

Highlighted intercepts at La Luz include up to 2,607 g/t silver equivalent over 1.06 metres in hole LL-43 and 1,340 g/t silver equivalent over 0.94 metres in LL-77. At Terronera, notable results include 435 g/t silver equivalent over 8.11 metres in TRU-001 and 686 g/t silver equivalent over 5.32 metres in TRU-003.

Management states that drilling has extended mineralization along strike and at depth at both La Luz and Terronera and continues to view the area as having strong exploration potential. The company indicates it expects mining of the high-grade La Luz deposit to commence in 2027 and currently has two drill rigs operating at Terronera.

Positive

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Negative

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La Luz drilling 43 drill holes, 7,015 metres Completed on La Luz system since 2025
Terronera drilling 10 drill holes, 1,904 metres Completed on Terronera vein since 2025
La Luz highlight LL-43 2,607 g/t AgEq over 1.06 m 574 g/t Ag and 23.92 g/t Au true width
La Luz highlight LL-77 1,340 g/t AgEq over 0.94 m 1,271 g/t Ag and 0.81 g/t Au true width
Terronera highlight TRU-001 435 g/t AgEq over 8.11 m 282 g/t Ag and 1.80 g/t Au true width
Terronera highlight TRU-003 686 g/t AgEq over 5.32 m 150 g/t Ag and 6.30 g/t Au true width
AgEq ratio 85:1 Silver equivalent calculated using 85:1 ratio
La Luz mining start 2027 Management expects mining of high-grade La Luz deposit
AgEq financial
"AgEq is calculated using an 85:1 ratio"
NI 43-101 regulatory
"Overlain on Figure 10-5 NI 43-101 Technical Report May 15, 2023"
A Canadian regulatory standard that sets the rules for how mining and exploration companies must report mineral resources and reserves, requiring technical reports prepared or signed off by an independent, certified expert. It matters to investors because it creates a consistent, transparent “inspection report” for mining projects, making it easier to compare prospects, judge the reliability of claims, and assess geological and financial risk before investing.
fire assay technical
"Gold was assayed by 30-gram fire assay with atomic absorption"
Fire assay is a laboratory process used to accurately measure the amount of precious metals, like gold or silver, in a sample of ore or material. It involves heating the sample intensely to separate the metals from other substances, much like melting and purifying metal to determine its purity. This method is important to investors because it provides precise data on the metal content, helping to assess the value of mining operations or mineral deposits.
ICP-AES / ICP-OES technical
"silver by aqua regia digestion with ICP-AES / ICP-OES finish"
forward-looking statements regulatory
"This news release contains “forward-looking statements” within the meaning"
Forward-looking statements are predictions or plans that companies share about what they expect to happen in the future, like estimating sales or profits. They matter because they help investors understand a company's outlook, but since they are based on guesses and assumptions, they can sometimes be wrong.
qualified person regulatory
"a qualified person under NI 43-101, has approved the scientific"
A qualified person is someone with specialized knowledge, experience, and training in a particular field, allowing them to accurately assess and verify information or work. Their expertise helps ensure that reports, evaluations, or decisions are trustworthy and meet required standards. For investors, a qualified person provides confidence that the information they rely on is credible and properly validated.
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Form 6-K: How Foreign Companies Report to the SEC →
 

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of June 2026

Commission File Number: 001-33153

Endeavour Silver Corp.
(Translation of registrant's name into English)

#1130-609 Granville Street
Vancouver, British Columbia, Canada V7Y 1G5
(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.
Form 20-F [   ]      Form 40-F [ X ]

 

 

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

      Endeavour Silver Corp.    
  (Registrant)
   
  
Date: June 18, 2026     /s/ DAN DICKSON    
  Dan Dickson
  CEO
  

EXHIBIT INDEX 

Exhibit Number Description
   
99.1 Press Release dated June 18, 2026

EXHIBIT 99.1

Endeavour Silver Intersects High-Grade Silver and Gold Mineralization at its Terronera Operation

VANCOUVER, British Columbia, June 18, 2026 (GLOBE NEWSWIRE) -- 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 Person1

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: apettit@edrsilver.com
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.

Photos accompanying this announcement are available at:
https://www.globenewswire.com/NewsRoom/AttachmentNg/449243c9-eefd-4017-94cb-d3990427e3e9

https://www.globenewswire.com/NewsRoom/AttachmentNg/377cc48a-4e2b-46e7-905a-276d88137266

Source: View Original Filing on SEC EDGAR

FAQ

What did Endeavour Silver (EXK) report in this Form 6-K?

Endeavour Silver reported new drill results from its Terronera operation in Mexico. The program includes 43 holes at La Luz and 10 at Terronera, highlighting high-grade silver and gold intercepts that help define and extend known mineralized zones.

Where is Endeavour Silver’s Terronera and La Luz drilling located?

The drilling is at the Terronera mine and the La Luz system in Jalisco, Mexico. These targets form part of Endeavour Silver’s newest mine, where the company is testing mineralization along strike and at depth within the broader Terronera vein system.

What are the key high-grade drill intercepts Endeavour Silver announced?

Key results include LL-43 with 2,607 g/t AgEq over 1.06 metres and LL-77 with 1,340 g/t AgEq over 0.94 metres at La Luz. At Terronera, TRU-001 returned 435 g/t AgEq over 8.11 metres and TRU-003 returned 686 g/t AgEq over 5.32 metres.

How many drill holes has Endeavour Silver completed at Terronera and La Luz?

Since 2025, Endeavour Silver has drilled 43 holes totaling 7,015 metres on the La Luz system and 10 holes totaling 1,904 metres on the Terronera vein. These holes aim to extend mineralization and improve geological understanding for mine planning.

When does Endeavour Silver expect to start mining the La Luz deposit?

Management expects mining of the high-grade La Luz deposit to commence in 2027. The company plans to use a combination of long hole and cut and fill methods, supported by drilling that refines the deposit’s geometry and supports detailed mine design work.

How is Endeavour Silver continuing exploration at the Terronera vein?

Two drill rigs are currently operating at Terronera, testing mineralization along strike and at depth through the middle of the fourth quarter. All Terronera drill holes have been summarized, showing continued high-grade zones and extended vein continuity within the system.

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