Announcement • Jun 18
Endeavour Silver Corp Reports Positive Drill Results from Exploration Program At Terronera Operation
Endeavour Silver Corp. announced 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. 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: LL-43 La Luz 104.10-105.40m, 1.06m true width, 23.92 gpt Au, 574 gpt Ag, 2,607 gpt AgEq; LL-77 La Luz 183.85-185.20m, 0.94m true width, 0.81 gpt Au, 1,271 gpt Ag, 1,340 gpt AgEq; and other detailed results as listed in the article. Table 2. Terronera Drill Results: TRU-001 Terronera 121.40-131.55m, 8.11m true width, 1.80 gpt Au, 282 gpt Ag, 435 gpt AgEq; TRU-003 Terronera 109.20-118.60m, 5.32m true width, 6.30 gpt Au, 150 gpt Ag, 686 gpt AgEq; and other detailed results as listed in the article. AgEq is calculated using an 85:1 Au:Ag ratio. 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.
