Endeavour Silver Continues to Confirm High-Grade Structures During its 2024/2025 Drill Program at Pitarrilla

2025-06-03

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VANCOUVER, British Columbia, June 03, 2025 (GLOBE NEWSWIRE) -- Endeavour Silver Corp. (“Endeavour” or the “Company”) (NYSE: EXK; TSX: EDR) is pleased to report positive drill results from its exploration program at its 100% owned Pitarrilla project in Durango, Mexico. The focus of the drill program is to further define the geometry of multiple, sub-vertical, mineralized feeder structures and the mineralized manto that was initially outlined by historical drilling. Drilling from surface and underground has been successful in intersecting high-grade silver, zinc and lead mineralization and provides additional confidence required to upgrade existing mineral resources.

Highlighted Drill Results from Casas Blancas Vein

1,127 gpt Ag, 1.40% Pb and 4.36% Zn for for 1,319 gpt AgEq over 2.08 m ETW , including 4,630 gpt Ag, 2.26% Pb and 3.49% Zn for for 4,814 gpt AgEq over 0.20 m ETW in hole BPD-505 893 gpt Ag, 2.06% Pb and 2.56% Zn for for 1,038 gpt AgEq over 3.97 m ETW , including 5,090 gpt Ag, 9.22% Pb and 0.84% Zn for for 5,363 gpt AgEq over 0.23 m ETW in hole BPD-506 232 gpt Ag, 1.05% Pb and 8.79% Zn for for 573 gpt AgEq over 4.10 m ETW, including 973 gpt Ag, 2.47% Pb and 33.94% Zn for for 2,246 gpt AgEq over 0.46 m ETW in hole BPD-501

Highlighted Drill Results from Danna Vein

2,481 gpt Ag, 2.39% Pb and 4.57% Zn for for 2,707 gpt AgEq over 1.03 m ETW , including 4,520 gpt Ag, 4.35% Pb and 7.96% Zn for for 4,918 gpt AgEq over 0.54 m ETW in hole BPU-005 307 gpt Ag, 2.11% Pb and 2.26% Zn for for 443 gpt AgEq over 5.22 m ETW , including 1,020 gpt Ag, 14.30% Pb and 14.25% Zn for for 1,904 gpt AgEq over 0.52 m ETW in hole BPU-014 322 gpt Ag, 1.57% Pb and 3.65% Zn for for 493 gpt AgEq over 7.37 m ETW , including 922 gpt Ag, 6.43% Pb and 12.55% Zn for for 1,538 gpt AgEq over 0.55 m ETW in hole BPU-019

Highlighted Drill Results from Victoria Vein

221 gpt Ag, 2.98% Pb and 6.39% Zn for for 527 gpt AgEq over 2.34 m ETW , including 495 gpt Ag, 6.91% Pb and 15.75% Zn for for 1,238 gpt AgEq over 0.30 m ETW in hole BPU-017 643 gpt Ag, 5.81% Pb and 6.93% Zn for for 1,043 gpt AgEq over 1.51 m ETW , including 1,015 gpt Ag, 9.15% Pb and 8.78% Zn for for 1,569 gpt AgEq over 0.91 m ETW in hole BPU-018

Highlighted Drill Results from Manto Pitarrilla

129 gpt Ag, 0.84% Pb and 2.55% Zn for for 242 gpt AgEq over 247 m , including 716 gpt Ag, 4.19% Pb and 6.61% Zn for for 1,062 gpt AgEq over 1.00 m and 2,680 gpt Ag, 24.03% Pb and 18.90% Zn for for 3,987 gpt AgEq over 0.60 m in hole BPU-022

Abbreviations include: gpt: grams per tonne; Ag: silver; Pb: lead; Zn: zinc; ETW: estimated true width; m: metre. Silver equivalents are calculated using prices of $26/oz for silver, $1.00/lb for lead and $1.35/lb for zinc. Variable amounts of gold and copper occur but have not been included in the AgEq calculation.

Drilling Context

The simplified geology of the Pitarrilla deposit includes three mineralized domains (Figure 5).

1. Upper volcanics, primarily of andesitic composition 2. Conglomerate (Manto Pitarrilla), flat lying, strata-bound with massive replacement mineralization 3. Lower marine sediments

In addition, at least four sulphide mineralized veins (Casas Blancas, Victoria, Danna, and Palmito) and two sulphide mineralized dykes (Cuchara and Pena) have been identified. Drilling has confirmed that all structures originate below the marine sediments, extend through Manto Pitarrilla, and into the upper volcanics. These feeder structures remain open at depth.

Between September 2024 and April 2025, an additional 31 drill holes totaling 11,200 metres have been completed. 4,360 metres from 12 holes collared from surface and 6,839 metres from 19 holes from underground drill stations. The Danna vein returned the widest mineralized interval with results up to 7.4 metres in estimated true width from hole BPU-019, while two of three holes that intersected Casas Blancas returned economic grades over 4.0 metres in estimated true width (BPD-501 and BPD-506).

Drill hole BPU-022 was drilled at a low angle (-22.5 degrees) through the horizontal lying Manto Pitarrilla and returned 247 m (apparent width) of 254 gpt AgEq (see figure 5). Due to the irregular geometry of the Manto Pitarrilla, true width is variable, however drill data estimates the dimensions to be approximately 400 metres wide and up to 100 metres high in some parts.

Table 1. Surface Diamond Drill Results

| Hole | Structure | From | To | True Width | Au | Ag | Cu | Pb | Zn | AgEq | | (m) | (m) | (m) | (gpt) | (gpt) | (%) | (%) | (%) | (gpt) | | | | BPD-501 | Casas Blancas | 361.50 | 367.20 | 4.10 | 0.05 | 232 | 0.04 | 1.05 | 8.79 | 573 | | Including | 362.75 | 363.35 | 0.46 | 0.12 | 973 | 0.08 | 2.47 | 33.94 | 2,246 | | | Norma | 406.80 | 410.10 | 2.84 | 0.10 | 302 | 0.04 | 1.72 | 1.75 | 410 | | | Including | 407.90 | 408.50 | 0.52 | 0.07 | 442 | 0.08 | 2.66 | 3.05 | 621 | | | BPD-505 | Hw Casas Blancas | 211.65 | 218.30 | 3.43 | 0.06 | 272 | 0.04 | 0.46 | 5.77 | 489 | | Including | 216.90 | 217.30 | 0.21 | 0.72 | 641 | 0.05 | 0.83 | 28.00 | 1,660 | | | Casas Blancas | 224.00 | 228.00 | 2.08 | 0.13 | 1,127 | 0.05 | 1.40 | 4.36 | 1,319 | | | Including | 225.70 | 226.10 | 0.20 | 0.07 | 4,630 | 0.18 | 2.26 | 3.49 | 4,814 | | | Norma Projection | 305.80 | 309.95 | 3.08 | 0.06 | 235 | 0.04 | 1.01 | 1.41 | 311 | | | Including | 307.30 | 308.00 | 0.52 | 0.08 | 354 | 0.04 | 0.94 | 0.54 | 398 | | | Victoria | 374.55 | 377.10 | 1.08 | 0.02 | 65 | 0.10 | 0.99 | 1.55 | 146 | | | Including | 375.55 | 376.00 | 0.19 | 0.04 | 72 | 0.12 | 1.37 | 1.71 | 169 | | | BPD-506 | Casas Blancas | 209.00 | 218.40 | 3.97 | 0.04 | 893 | 0.04 | 2.06 | 2.56 | 1,038 | | Including | 212.00 | 212.55 | 0.23 | 0.15 | 5,090 | 0.08 | 9.22 | 0.84 | 5,363 | | | Norma Projection | 362.55 | 364.35 | 1.20 | 0.17 | 188 | 0.01 | 0.65 | 0.46 | 221 | | | Including | 362.55 | 363.20 | 0.43 | 0.41 | 319 | 0.02 | 1.39 | 0.69 | 380 | | | Victoria | 436.50 | 444.00 | 3.64 | 0.17 | 565 | 0.05 | 1.30 | 1.47 | 652 | | | Including | 439.50 | 441.00 | 0.73 | 0.28 | 1,350 | 0.11 | 2.15 | 3.22 | 1,521 | |

_*Drill holes BPD-502, BPD-503, BPD-504, BPD-507, BPD-508, BPD-509, BPD-510, BPD-511 and BPD-512 returned no significant results _

Table 2. Underground Diamond Drill Results, Vein Intercepts

| Hole | Structure | From | To | True Width | Au | Ag | Cu | Pb | Zn | AgEq | | (m) | (m) | (m) | (gpt) | (gpt) | (%) | (%) | (%) | (gpt) | | | | BPU-004 | Casas Blancas Projection | 181.25 | 183.50 | 1.69 | 0.07 | 170 | 0.91 | 0.05 | 0.89 | 203 | | Including | 181.45 | 182.00 | 0.41 | 0.01 | 243 | 1.56 | 0.07 | 2.92 | 349 | | | Palmito | 248.90 | 251.00 | 1.46 | 0.48 | 76 | 0.02 | 0.30 | 0.82 | 113 | | | Including | 249.80 | 250.05 | 0.17 | 0.20 | 583 | 0.08 | 2.24 | 6.37 | 869 | | | Hw Danna | 269.25 | 271.00 | 1.69 | 0.00 | 103 | 0.24 | 0.63 | 1.89 | 187 | | | Including | 269.25 | 269.95 | 0.68 | <0.005 | 135 | 0.44 | 0.63 | 1.95 | 221 | | | Danna Projection | 316.15 | 317.70 | 1.25 | 0.00 | 82 | 0.01 | 0.18 | 0.24 | 96 | | | Victoria | 359.80 | 361.10 | 1.10 | 0.00 | 84 | 0.01 | 0.29 | 0.12 | 95 | | | BPU-005 | Palmito | 163.55 | 164.95 | 1.32 | 0.31 | 134 | 0.01 | 0.56 | 0.80 | 177 | | Including | 163.55 | 164.20 | 0.61 | 0.63 | 170 | 0.01 | 1.17 | 0.86 | 232 | | | Danna | 340.35 | 341.40 | 1.03 | 0.13 | 2,481 | 1.18 | 2.39 | 4.57 | 2,707 | | | Including | 340.85 | 341.40 | 0.54 | 0.22 | 4,520 | 2.14 | 4.35 | 7.96 | 4,918 | | | BPU-006 | Palmito Projection | 184.45 | 185.95 | 1.30 | 0.01 | 31 | 0.02 | 0.18 | 0.76 | 63 | | Hw Danna | 246.85 | 248.50 | 1.65 | 0.02 | 175 | 0.03 | 1.89 | 3.28 | 342 | | | Including | 247.75 | 248.50 | 0.75 | 0.05 | 124 | 0.07 | 1.47 | 6.58 | 397 | | | Danna | 278.20 | 280.50 | 2.22 | 0.03 | 189 | 0.14 | 2.09 | 2.84 | 345 | | | Including | 280.30 | 280.50 | 0.19 | 0.23 | 1,780 | 1.03 | 21.00 | 14.35 | 2,845 | | | Victoria | 348.65 | 350.50 | 1.37 | 0.02 | 132 | 0.03 | 1.27 | 1.43 | 216 | | | Including | 350.30 | 350.50 | 0.17 | 0.13 | 915 | 0.24 | 9.30 | 9.07 | 1,483 | | | BPU-007 | Palmito Projection | 85.10 | 90.40 | 3.04 | 0.01 | 150 | 0.11 | 1.72 | 4.77 | 365 | | Including | 90.05 | 90.40 | 0.33 | 0.03 | 579 | 0.07 | 7.25 | 6.41 | 998 | | | Danna | 170.00 | 171.50 | 0.96 | 0.04 | 78 | 0.10 | 0.37 | 0.61 | 110 | | | Including | 171.20 | 171.50 | 0.19 | 0.17 | 354 | 0.43 | 1.66 | 2.72 | 494 | | | Victoria Projection | 327.85 | 333.60 | 3.69 | 0.13 | 214 | 0.03 | 0.62 | 1.11 | 270 | | | Including | 327.85 | 329.05 | 0.88 | 0.35 | 364 | 0.07 | 1.18 | 2.24 | 475 | | | BPU-008 | Palmito | 78.70 | 80.45 | 1.60 | 0.18 | 403 | 0.02 | 3.15 | 2.09 | 561 | | Including | 79.45 | 80.45 | 0.91 | 0.15 | 555 | 0.02 | 5.00 | 2.20 | 765 | | | Danna Projection | 122.80 | 123.75 | 0.95 | 0.03 | 53 | 0.01 | 0.35 | 2.63 | 156 | | | Including | 122.80 | 123.75 | 0.95 | 0.03 | 53 | 0.01 | 0.35 | 2.63 | 156 | | | BPU-009 | Palmito | 60.90 | 62.45 | 1.55 | 0.00 | 13 | 0.02 | 0.02 | 8.51 | 317 | | Including | 61.70 | 61.90 | 0.20 | <0.005 | 21 | 0.02 | 0.03 | 14.40 | 535 | | | Danna | 187.05 | 188.20 | 1.08 | 1.05 | 126 | 0.00 | 0.44 | 0.16 | 144 | | | Including | 187.60 | 188.20 | 0.56 | 1.28 | 208 | 0.00 | 0.67 | 0.28 | 236 | | | Victoria | 222.35 | 223.50 | 1.08 | 0.12 | 304 | 0.04 | 3.54 | 3.04 | 506 | | | Including | 222.55 | 222.75 | 0.19 | 0.44 | 1,605 | 0.17 | 19.58 | 9.01 | 2,442 | | | Fw Victoria | 279.35 | 281.25 | 1.22 | 0.51 | 34 | 0.02 | 0.22 | 2.65 | 134 | | | Including | 280.35 | 281.25 | 0.58 | 1.04 | 46 | 0.02 | 0.41 | 3.27 | 173 | | | BPU-010 | Palmito | 59.05 | 60.55 | 1.36 | 0.00 | 9 | 0.01 | 0.03 | 6.05 | 225 | | Including | 59.05 | 59.70 | 0.59 | <0.005 | 11 | 0.01 | 0.04 | 6.76 | 253 | | | Danna | 166.65 | 167.75 | 1.00 | 0.36 | 11 | 0.00 | 0.05 | 0.03 | 13 | | | Including | 166.65 | 166.95 | 0.27 | 0.86 | 26 | 0.00 | 0.11 | 0.02 | 29 | | | BPU-011 | Palmito | 47.60 | 51.00 | 3.06 | 0.02 | 58 | 0.02 | 0.19 | 9.64 | 407 | | Including | 47.60 | 48.20 | 0.54 | 0.03 | 61 | 0.06 | 0.21 | 34.75 | 1,303 | | | Danna | 182.20 | 184.05 | 1.09 | 0.97 | 13 | 0.00 | 0.08 | 0.04 | 17 | | | Including | 183.45 | 184.05 | 0.35 | 2.85 | 23 | 0.00 | 0.03 | 0.03 | 25 | | | Victoria | 302.65 | 304.30 | 1.48 | 0.04 | 317 | 0.04 | 4.84 | 3.30 | 562 | | | Including | 302.65 | 303.00 | 0.31 | 0.09 | 1,000 | 0.10 | 15.25 | 7.52 | 1,670 | | | BPU-012 | Palmito | 92.10 | 93.85 | 1.15 | 0.47 | 69 | 0.02 | 0.45 | 5.80 | 288 | | Including | 93.10 | 93.85 | 0.49 | 0.32 | 116 | 0.03 | 0.74 | 8.65 | 443 | | | Danna | 182.60 | 184.60 | 1.00 | 0.01 | 6 | 0.00 | 0.07 | 0.15 | 14 | | | BPU-013 | Palmito | 68.50 | 69.85 | 1.33 | 0.22 | 56 | 0.03 | 0.07 | 2.43 | 145 | | Including | 69.05 | 69.85 | 0.79 | 0.29 | 55 | 0.04 | 0.08 | 3.00 | 164 | | | Danna | 155.20 | 156.55 | 1.00 | 0.18 | 81 | 0.04 | 0.62 | 1.35 | 146 | | | Including | 156.00 | 156.55 | 0.41 | 0.34 | 136 | 0.04 | 1.18 | 2.49 | 256 | | | BPU-014 | Palmito | 94.90 | 96.00 | 1.01 | 0.15 | 87 | 0.09 | 0.37 | 4.84 | 270 | | Including | 95.25 | 96.00 | 0.69 | 0.14 | 84 | 0.09 | 0.33 | 5.60 | 292 | | | Danna | 226.60 | 232.15 | 5.22 | 0.12 | 307 | 0.14 | 2.11 | 2.26 | 443 | | | Including | 226.60 | 227.15 | 0.52 | 0.93 | 1,020 | 0.28 | 14.30 | 14.25 | 1,904 | | | BPU-015 | Palmito | 85.00 | 86.20 | 0.95 | 0.06 | 18 | 0.02 | 0.06 | 2.81 | 120 | | Including | 85.00 | 85.35 | 0.28 | 0.09 | 18 | 0.03 | 0.03 | 6.61 | 254 | | | Danna | 267.80 | 272.25 | 3.41 | 0.07 | 368 | 0.10 | 1.72 | 3.33 | 532 | | | Including | 270.40 | 271.40 | 0.77 | 0.11 | 846 | 0.28 | 0.48 | 6.87 | 1,103 | | | BPU-016 | Palmito | 87.50 | 89.25 | 1.08 | 0.28 | 90 | 0.04 | 0.60 | 7.80 | 383 | | Including | 87.50 | 88.25 | 0.46 | 0.59 | 70 | 0.04 | 0.48 | 12.10 | 514 | | | Danna | 271.20 | 274.15 | 1.47 | 0.03 | 49 | 0.02 | 0.99 | 3.44 | 197 | | | Including | 271.20 | 271.45 | 0.13 | 0.04 | 74 | 0.06 | 1.08 | 17.75 | 734 | | | BPU-017 | Palmito | 68.30 | 69.90 | 1.24 | 0.10 | 34 | 0.00 | 0.05 | 5.73 | 239 | | Including | 69.30 | 69.90 | 0.47 | 0.22 | 47 | 0.00 | 0.04 | 10.35 | 416 | | | Danna | 156.00 | 157.50 | 1.15 | 0.02 | 206 | 0.02 | 3.05 | 1.80 | 351 | | | Victoria | 305.35 | 308.05 | 2.34 | 0.04 | 221 | 0.07 | 2.98 | 6.39 | 527 | | | Including | 305.90 | 306.25 | 0.30 | 0.07 | 495 | 0.15 | 6.91 | 15.75 | 1,238 | | | BPU-018 | Palmito | 67.00 | 68.05 | 0.96 | 0.50 | 12 | 0.01 | 0.01 | 8.20 | 304 | | Danna Projection | 171.30 | 172.40 | 1.03 | 0.02 | 265 | 0.08 | 1.63 | 2.51 | 398 | | | Including | 171.90 | 172.40 | 0.47 | 0.04 | 518 | 0.18 | 2.59 | 4.95 | 763 | | | Victoria | 340.65 | 342.80 | 1.51 | 0.08 | 643 | 0.15 | 5.81 | 6.93 | 1,043 | | | Including | 341.50 | 342.80 | 0.91 | 0.12 | 1,015 | 0.23 | 9.15 | 8.78 | 1,569 | | | BPU-019 | Palmito | 80.50 | 82.60 | 1.22 | 0.03 | 31 | 0.01 | 0.04 | 1.52 | 86 | | Danna Projection | 169.75 | 179.10 | 7.37 | 0.10 | 322 | 0.24 | 1.57 | 3.65 | 493 | | | Including | 178.40 | 179.10 | 0.55 | 0.27 | 922 | 1.39 | 6.43 | 12.55 | 1,538 | | | Victoria Projection | 355.65 | 361.75 | 4.08 | 0.03 | 134 | 0.03 | 1.67 | 1.66 | 237 | | | Including | 356.65 | 357.65 | 0.67 | 0.04 | 212 | 0.04 | 2.65 | 2.03 | 354 | | | BPU-020 | Palmito | 73.20 | 75.60 | 1.20 | 0.01 | 14 | 0.00 | 0.02 | 13.18 | 484 | | Including | 75.25 | 75.60 | 0.17 | <0.005 | 18 | 0.01 | 0.01 | 15.75 | 579 | | | Danna | 209.50 | 210.90 | 1.15 | 0.16 | 938 | 0.37 | 3.16 | 4.97 | 1,198 | | | Including | 209.50 | 209.90 | 0.33 | 0.44 | 2,930 | 1.07 | 7.28 | 11.60 | 3,535 | | | Victoria Projection | 376.45 | 377.90 | 1.14 | 0.13 | 326 | 0.10 | 2.74 | 6.36 | 625 | | | Including | 376.00 | 376.45 | 0.27 | 0.23 | 924 | 0.24 | 7.78 | 14.60 | 1,649 | | | BPU-021 | Palmito | 67.15 | 69.10 | 1.60 | 0.06 | 64 | 0.01 | 0.11 | 1.19 | 109 | | Including | 67.15 | 68.15 | 0.82 | 0.11 | 99 | 0.01 | 0.18 | 1.63 | 162 | | | Danna | 185.75 | 188.65 | 2.56 | 0.21 | 558 | 0.34 | 1.67 | 3.16 | 715 | | | Including | 172.70 | 195.75 | 20.35 | 0.11 | 325 | 0.12 | 1.13 | 1.99 | 426 | | | BPU-022 | Palmito | 149.50 | 151.10 | 1.28 | 0.05 | 199 | 0.03 | 1.78 | 4.44 | 404 | | Including | 149.50 | 150.60 | 0.88 | 0.08 | 250 | 0.02 | 2.22 | 3.11 | 419 | |

Table 3. Manto Pitarrilla

| Hole | Structure | From | To | Apparent Width | Au | Ag | Cu | Pb | Zn | AgEq | | (m) | (m) | (m) | (gpt) | (gpt) | (%) | (%) | (%) | (gpt) | | | | BPU-008 | Manto Pitarrilla | 78.70 | 151.00 | 72.30 | 0.05 | 64 | 0.01 | 0.49 | 2.53 | 167 | | Including | 90.10 | 90.60 | 0.50 | 0.09 | 719 | 0.02 | 7.95 | 14.65 | 1,450 | | | Including | 141.50 | 142.50 | 1.00 | 0.02 | 463 | 0.07 | 4.78 | 8.34 | 886 | | | BPU-009 | Manto Pitarrilla | 60.90 | 173.70 | 112.80 | 0.05 | 41 | 0.08 | 0.27 | 1.67 | 107 | | Including | 133.90 | 134.30 | 0.40 | 0.01 | 203 | 0.70 | 0.91 | 25.40 | 1,131 | | | BPU-010 | Manto Pitarrilla | 57.60 | 142.00 | 84.40 | 0.04 | 75 | 0.08 | 0.34 | 3.79 | 219 | | Including | 133.60 | 134.60 | 1.00 | 0.03 | 387 | 0.74 | 0.92 | 20.60 | 1,144 | | | BPU-011 | Manto Pitarrilla | 45.10 | 132.00 | 86.90 | 0.08 | 36 | 0.02 | 0.16 | 1.77 | 103 | | Including | 45.10 | 45.35 | 0.25 | 3.62 | 129 | 0.03 | 0.82 | 5.88 | 360 | | | Including | 69.55 | 70.30 | 0.75 | 0.01 | 8 | 0.01 | 0.00 | 18.65 | 672 | | | BPU-012 | Manto Pitarrilla | 73.50 | 132.85 | 59.35 | 0.15 | 24 | 0.01 | 0.16 | 3.40 | 149 | | Including | 86.60 | 87.60 | 1.00 | 0.01 | 137 | 0.04 | 1.10 | 13.85 | 659 | | | Including | 95.65 | 96.65 | 1.00 | 0.07 | 76 | 0.03 | 0.79 | 7.98 | 381 | | | BPU-013 | Manto Pitarrilla | 60.80 | 116.95 | 56.15 | 0.10 | 20 | 0.02 | 0.06 | 0.98 | 57 | | Including | 61.80 | 62.80 | 1.00 | 0.01 | 47 | 0.02 | 0.10 | 3.15 | 162 | | | Including | 107.60 | 108.60 | 1.00 | 0.16 | 124 | 0.03 | 0.16 | 0.41 | 143 | | | BPU-014 | Manto Pitarrilla | 64.05 | 115.00 | 50.95 | 0.07 | 39 | 0.02 | 0.23 | 1.90 | 113 | | Including | 70.85 | 71.50 | 0.65 | 0.06 | 23 | 0.01 | 0.09 | 11.25 | 426 | | | Including | 114.00 | 115.00 | 1.00 | 0.86 | 432 | 0.04 | 2.23 | 1.45 | 542 | | | BPU-015 | Manto Pitarrilla | 52.35 | 116.70 | 64.35 | 0.09 | 27 | 0.01 | 0.17 | 2.70 | 128 | | Including | 62.00 | 63.00 | 1.00 | <0.005 | 16 | 0.01 | 0.03 | 13.95 | 513 | | | Including | 99.70 | 100.60 | 0.90 | <0.005 | 120 | 0.01 | 1.23 | 2.59 | 245 | | | BPU-016 | Manto Pitarrilla | 68.30 | 105.00 | 36.70 | 0.35 | 46 | 0.02 | 0.26 | 2.02 | 125 | | Including | 84.00 | 85.00 | 1.00 | 0.04 | 119 | 0.04 | 0.64 | 3.68 | 267 | | | Including | 92.05 | 93.00 | 0.95 | 0.02 | 98 | 0.08 | 0.62 | 8.52 | 417 | | | BPU-017 | Manto Pitarrilla | 66.70 | 117.80 | 51.10 | 0.08 | 47 | 0.04 | 0.34 | 1.35 | 104 | | Including | 66.70 | 67.50 | 0.80 | <0.005 | 10 | 0.01 | 0.02 | 5.16 | 194 | | | Including | 102.65 | 103.35 | 0.70 | 0.13 | 377 | 0.16 | 3.85 | 1.36 | 527 | | | BPU-018 | Manto Pitarrilla | 58.80 | 131.20 | 72.40 | 0.07 | 23 | 0.02 | 0.14 | 1.14 | 67 | | Including | 64.45 | 65.45 | 1.00 | 0.15 | 11 | 0.01 | 0.04 | 6.98 | 261 | | | Including | 99.60 | 100.60 | 1.00 | 0.05 | 116 | 0.03 | 0.63 | 0.89 | 164 | | | BPU-019 | Manto Pitarrilla | 62.50 | 118.55 | 56.05 | 0.08 | 11 | 0.02 | 0.03 | 1.01 | 48 | | Including | 67.75 | 68.50 | 0.75 | 0.01 | 45 | 0.03 | 0.25 | 3.08 | 161 | | | Including | 116.00 | 116.80 | 0.80 | 1.20 | 21 | 0.03 | 0.05 | 2.92 | 126 | | | BPU-020 | Manto Pitarrilla | 59.60 | 127.15 | 67.55 | 0.08 | 32 | 0.01 | 0.15 | 2.03 | 108 | | Including | 72.20 | 73.20 | 1.00 | <0.005 | 12 | 0.00 | 0.04 | 6.88 | 258 | | | Including | 104.30 | 105.30 | 1.00 | 0.35 | 202 | 0.05 | 1.02 | 6.32 | 454 | | | BPU-021 | Manto Pitarrilla | 61.00 | 127.40 | 66.40 | 0.07 | 24 | 0.02 | 0.09 | 1.64 | 85 | | Including | 63.00 | 64.00 | 1.00 | 0.01 | 13 | 0.01 | 0.05 | 14.40 | 527 | | | Including | 105.00 | 106.00 | 1.00 | 0.01 | 88 | 0.04 | 0.69 | 1.86 | 173 | | | BPU-022 | Manto Pitarrilla | 149.50 | 396.55 | 247.05 | 0.05 | 129 | 0.09 | 0.84 | 2.55 | 242 | | Including | 154.10 | 155.10 | 1.00 | 0.04 | 110 | 0.05 | 1.05 | 11.00 | 529 | | | Including | 197.60 | 198.60 | 1.00 | 0.08 | 142 | 0.06 | 1.23 | 15.55 | 728 | | | Including | 278.50 | 279.50 | 1.00 | 0.03 | 716 | 0.63 | 4.19 | 6.61 | 1,062 | | | Including | 314.75 | 315.35 | 0.60 | 0.29 | 2,680 | 2.38 | 24.03 | 18.90 | 3,987 | | | Including | 361.40 | 362.00 | 0.60 | 0.40 | 604 | 0.07 | 3.95 | 3.74 | 841 | |

(1) Note: No capping has been applied but high-grade intervals have been highlighted. True width has been calculated from interpreted sections. Gold (Au) and copper (Cu) have been excluded in the AgEq calculation.

Figure 1. Casas Blanca Longitudinal Section

Figure 2. Victoria Longitudinal Section

Figure 3. Danna Longitudinal Section

Figure 4. Palmito Longitudinal Section

Figure 5. Cross Section – Manto Pitarrilla

Since acquiring the Pitarrilla Project in July 2022, Endeavour has undertaken an extensive re-logging of historical drill core to enhance its understanding of the deposit’s geology and mineralization controls. The Company has prioritized the identification and delineation of multiple high-grade feeder structures, which are believed to be the primary conduits for the silver, lead, and zinc sulphide mineralization. These structures are interpreted to extend into the high-grade manto, initially outlined by the previous owner. A Technical Report supporting updated Mineral Resource Estimates was published on November 21, 2022 ( refer to news release dated December 8, 2022 ).

Pitarrilla is a large undeveloped silver, lead, and zinc project located 160 kilometres north of Durango City, in northern Mexico. The project is within the Municipality of Santa María del Oro and Indé on the eastern flank of the Sierra Madre Occidental mountain range. The property comprises 4,752 hectares across five concessions and has significant infrastructure in place with direct access to utilities. A significant resource has been defined with over 240,000 metres of exploration drilling incurred to date. A number of key permits are already in place for underground mining and development, including permits for water use and discharge, general use of explosives, change use of soil, as well as underground mining and development which are permitted under an Environmental Impact Statement.