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

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

Endeavour Silver Corp. (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.

About Endeavour Silver

Endeavour is a mid-tier precious metals company with a strong commitment to sustainable and responsible mining practices. With operations in Mexico and Peru, and the development of the new cornerstone mine in Jalisco state, the company aims to contribute positively to the mining industry and the communities in which it operates. In addition, Endeavour has a portfolio of exploration projects in Mexico, Chile and the United States to facilitate its goal to become a premier senior silver producer.

Posted June 3, 2025
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