Gold Resource Corporation press release
Gold Resource Corporation Reports H1 2025 Drilling Results and Operational Improvements at the Don David Gold Mine
NYSE - New York Stock Exchange · Gold · Silver · Copper · Lead · Zinc · Canada
Gold Resource Corporation (NYSE American: GORO) (“we,” “us,” “our” or the “ Company ”) is pleased to report highlights to date from its 2025 underground drilling campaign and provide an operational update from the Company’s Don David Gold Mine (“DDGM”) in Oaxaca, Mexico.
This press release features multimedia. View the full release here: https://www.businesswire.com/news/home/20250730069272/en/
Plan View of H1 2025 Drill Holes
Highlights
Drill results from the new Three Sisters Vein System continue to return consistent results that indicate good width and grades that indicate potentially higher Net Smelter Return 1 values (“NSR”). The Company has engaged Cominvi Servicios S.A. de C.V an experienced underground mining contractor, with the benefit of their new mining equipment, to accelerate the development and access into the higher grade Three Sisters vein systems. Since May, more than 1,350 meters of development, including ramps and drifts, have been completed. The Company has begun using cut-and-fill mining methods in select areas of the mine to reduce dilution and increase the run of mine average grade and returns. A third dry stack filter press has been ordered for the processing plant to increase throughput and returns. Orders are in for good used equipment to replace some of our own older underground fleet. This will reduce maintenance costs and improve our productivity. The process plant is under a full review to the goal to further optimize reagent use and increase recoveries and payable metals. Initial trials already indicate the potential for promising returns.
2025 DRILLING SUMMARY
During the first half of 2025, the underground diamond drill program focused on ore definition and grade-control within the Three Sisters vein system, as well as in select veins of the Arista system. Significant vein widths and grades were encountered and reinforce the potential for the Three Sisters and Gloria vein systems to be a third major mineralized vein system strategically located between and north of the Arista and Switchback systems.
“Consistent high-grade drill intercepts, along with an improved understanding of the geology, have allowed us to build more confidence in the mine plan of the Three Sisters system and reinforcing its role as a key contributor to future mine production,” stated Allen Palmiere, President and CEO of the Company. “In addition, we are excited about the potential benefits from bringing in an experienced mining contractor along with their new equipment, while changing out some of our old fleet with good used equipment to improve our efficiencies and returns. We remain focused on integrating the Three Sisters system into our short-term mine plan while continuing to advance exploration efforts aimed at driving sustainable growth and maximizing shareholder value.”
The drill result highlights presented in this press release further demonstrate the growing potential of these vein systems. The Company believes the mine has significant potential to generate positive cash flow from the newly defined Three Sisters and Gloria vein systems, as well as from additional zones recently identified near existing mining areas in both the Arista and Switchback systems. The Three Sisters and Gloria vein systems are easier to access, located near the current mine portal and at significantly higher elevations than those of other production areas and will result in reduced haulage distances and costs. To support access and continued definition of these areas, targeted investment in underground development and equipment has been initiated, including the engagement of a contract miner in Q2 2025 and the sourcing of lightly used underground mining equipment.
2025 Drill Results and Program: Through the first half of 2025, a total of 51 underground definition and ore-control drill holes, totaling 6,615 meters of diamond drilling, have been completed at DDGM. The program continues to deliver high-grade intercepts that confirm the continuity and quality of the mineralization. These results have further defined the geologic model for the Three Sisters and Gloria vein systems, while also upgrading mineral resources within select veins of the Arista system. The Company plans to initiate additional exploration development in the second half of 2025 to support further infill and expansion drilling, particularly to the northwest of the currently defined extents of the Three Sisters – Gloria zone.
Selected grade-control drill results from the first half of 2025 at the Three Sisters vein system are presented below. Intercepts are reported as Estimated True Widths 2 (“ETW”) and include Gold Equivalent 3 grades (“AuEq”) and NSR.
Hole No. 525011: Sadie 1 vein $840/t NSR over 4.97 meters ETW ( 12.67 g/t AuEq ) Includes: $1,625/t NSR over 2.03 meters ( 23.74 g/t AuEq )
Hole No. 525018: Sandy 5 vein $1,665/t NSR over 4.83 meters ETW ( 23.73 g/t AuEq ) Includes: $3,090/t NSR over 2.20 meters ( 43.97 g/t AuEq )
Hole No. 525020: Sandy 5 vein $1,365/t NSR over 3.52 meters ETW ( 19.59 g/t AuEq ) Includes: $2,853/t NSR over 1.33 meters ( 41.08 g/t AuEq )
Hole No. 525024: Sandy 5 vein $452/t NSR over 4.72 meters ETW ( 6.46 g/t AuEq ) Includes: $1,277/t NSR over 1.26 meters ( 18.14 g/t AuEq )
Hole No. 525024: Sandy 1 vein $529/t NSR over 3.33 meters ( 7.40 g/t AuEq ) Includes: $654/t NSR over 1.25 meters ( 9.33 g/t AuEq )
Hole No. 525026: Sandy 5 vein $699/t NSR over 5.18 meters ( 10.03 g/t AuEq ) Includes: $1,238/t NSR over 1.32 meters ( 17.82 g/t AuEq )
Hole No. 525026: Sandy 2 vein $635/t NSR over 2.95 meters ( 9.06 g/t AuEq ) Includes: $1,532/t NSR over 0.71 meters ( 21.79 g/t AuEq )
Hole No. 525033: Sadie 2 vein $684/t NSR over 2.84 meters ( 9.80 g/t AuEq ) Includes: $2,641/t NSR over 0.51 meters ( 38.03 g/t AuEq )
Hole No. 525040: Sandy 1 vein $1,118/t NSR over 3.53 meters ( 16.03 g/t AuEq ) Includes: $2,151/t NSR over 1.00 meters ( 31.34 g/t AuEq )
Hole No. 525042: Sandy 1 vein $388/t NSR over 6.79 meters ( 4.83 g/t AuEq ) Includes: $1,528/t NSR over 0.85 meters ( 19.44 g/t AuEq )
Three Sisters and Gloria Vein Systems
Of the 51 drill holes completed during the first half of 2025, 36 were drilled within the Three Sisters vein system, totaling 5,017 meters of core. This focused drilling campaign enabled key refinements to the geologic model and increased confidence along approximately 350 meters of strike length. The work also led to the identification and modelling of two new veins, bringing the total number of modelled veins at Three Sisters from 10 to 12. This drilling is part of a broader effort to delineate high-grade mineralized zones and support the conversion of mineral resources ahead of planned development activities. These advancements have already contributed to detailed near-term mine planning.
The Three Sisters and Gloria vein systems remain open to the northwest, up-dip and at depth, and their close spatial and structural association continues to support their interpretation as a unified mineralized corridor. Additional exploration development planned for Q3 will allow for continued expansion and infill drilling to the north-west of the current resource shell limits.
OPERATIONS UPDATE
Mine Development – Three Sisters
In December 2024, DDGM initiated underground drift development to access the Three Sisters vein system. In May 2025, the contract mining services of Cominvi Servicios S.A. de C.V., were engaged to accelerate advancement into the zone whereby the end of Q2 2025, more than 1,350 meters of development, including ramps and drifts, had been completed. To date, the Three Sisters system has been successfully intersected on three levels, providing access to the Sandy 1, Sandy 2 and Sadie veins. Exposures reveal variable vein widths of up to 7.5 meters and recent production sampling on Level 4 (820 mASL) across the Sandy 1 vein, returned a high-grade interval of 36.72 g/t gold and 2,341 g/t silver over 0.90 meters. While not necessarily representative of the broader mineralization, this result highlights the presence of high-grade material within the system.
Due to the structurally complex geometry of the Three Sisters system at locations currently accessed to date, DDGM has elected to implement cut-and-fill mining methods. This approach allows for more selective and precise ore extraction from irregular zones, helping to reduce dilution and optimize mineral resource recovery.
Additional Improvements
The Company has started to slowly and methodically purchase used equipment that is in good repair. This is being done with a measured approach to ensure that appropriately sized equipment is being purchased for the mining requirements that are being projected. This equipment will replace the existing fleet that is old, requires significant maintenance, and has low availability.
The Company is also shifting mining methods in certain areas of the mine. Historically, all areas of the mine were mined using the long-hole stoping method, but it has been determined that by using the cut-and-fill method, dilution can be minimized. This new method can be effectively used to mine narrow veined areas, maintaining a higher grade due to the lower dilution.
Additionally, the Company is reviewing the process flow through the mill to evaluate the effects on recoveries. By fine tuning the use of reagents in the flow, the Company has been able to improve recoveries and achieve increased payable metals. The Company has also ordered a third filter press that, once in place at the mine site, should help to improve throughput capacity as well.
Select 2025 Definition and Grade-Control Drill Results 45 – Three Sisters and Arista Vein Systems
| HOLE | VEIN | FROM | TO | INTERVAL | ETW* | AU | AG | AuEq | CU | PB | ZN | NSR | | ID | (m) | (m) | (m) | (m) | ( g/t ) | ( g/t ) | (g/t) | ( % ) | ( % ) | ( % ) | ($/t) | | | 525001 | Marena | 34.72 | 37.33 | 2.60 | 2.26 | 0.75 | 328 | 4.15 | 1.54 | 6.03 | 15.72 | 587 | | | Includes | 34.72 | 36.40 | 1.68 | 1.46 | 1.15 | 508 | 6.42 | 2.32 | 9.35 | 24.41 | 907 | | 525001 | Viridiana | 48.60 | 50.52 | 1.90 | 1.80 | 1.59 | 36 | 1.96 | 0.40 | 1.95 | 6.44 | 219 | | | Includes | 48.60 | 49.57 | 0.97 | 0.92 | 3.12 | 68 | 3.83 | 0.65 | 3.83 | 12.52 | 421 | | 525002 | Viridiana | 51.91 | 53.27 | 1.36 | 1.28 | 1.46 | 104 | 2.54 | 0.26 | 4.45 | 14.90 | 378 | | 525005 | Sta Helena | 59.34 | 61.73 | 2.39 | 1.69 | 3.94 | 119 | 5.17 | 0.29 | 1.75 | 11.26 | 447 | | | Includes | 59.34 | 60.44 | 1.10 | 0.78 | 7.98 | 156 | 9.60 | 0.30 | 2.34 | 17.02 | 754 | | 525006 | Sta Helena | 54.45 | 56.44 | 1.99 | 1.96 | 1.83 | 221 | 4.12 | 0.61 | 4.83 | 15.94 | 513 | | | Includes | 55.22 | 56.44 | 1.22 | 1.20 | 2.92 | 339 | 6.44 | 0.31 | 5.15 | 23.81 | 734 | | 525007 | Marena | 38.64 | 40.24 | 1.60 | 1.45 | 0.67 | 46 | 1.15 | 0.75 | 2.44 | 14.53 | 293 | | 525008 | Viridiana | 82.97 | 86.12 | 3.15 | 2.96 | 0.04 | 277 | 2.92 | 0.03 | 0.62 | 3.76 | 253 | | | Includes | 84.44 | 86.12 | 1.68 | 1.58 | 0.06 | 426 | 4.48 | 0.03 | 0.79 | 6.16 | 391 | | 525010 | Sadie 3 | 41.84 | 46.75 | 4.91 | 4.25 | 1.26 | 153 | 2.85 | 0.12 | 0.54 | 0.57 | 193 | | | | 41.84 | 44.36 | 2.52 | 2.18 | 2.37 | 273 | 5.20 | 0.07 | 0.30 | 0.43 | 330 | | 525010 | Sasha 1 | 101.00 | 108.80 | 7.80 | 5.98 | 0.79 | 252 | 3.41 | 0.11 | 0.34 | 0.76 | 240 | | | Includes | 103.55 | 105.63 | 2.08 | 1.59 | 1.40 | 559 | 7.20 | 0.21 | 0.39 | 0.98 | 501 | | 525011 | Sadie 1 | 62.29 | 67.34 | 5.05 | 4.97 | 3.64 | 870 | 12.67 | 0.23 | 0.37 | 0.86 | 840 | | | Includes | 65.28 | 67.34 | 2.06 | 2.03 | 4.12 | 1891 | 23.74 | 0.46 | 0.68 | 1.67 | 1,625 | | 525012 | Sandy 1 | 37.37 | 39.67 | 2.30 | 2.08 | 2.22 | 97 | 3.23 | 0.17 | 0.64 | 1.97 | 221 | | 525013 | Sandy 2 | 42.39 | 44.94 | 2.60 | 2.21 | 2.28 | 306 | 5.45 | 0.14 | 0.40 | 0.96 | 360 | | 525014 | Sandy 4 | 67.31 | 69.22 | 1.90 | 1.65 | 1.55 | 238 | 4.02 | 0.11 | 0.32 | 0.98 | 271 | | | Includes | 67.31 | 68.06 | 0.75 | 0.65 | 1.74 | 544 | 7.38 | 0.17 | 0.39 | 1.30 | 509 | | 525014 | Sandy 2 | 43.67 | 46.10 | 2.43 | 2.10 | 0.81 | 150 | 2.36 | 0.14 | 0.28 | 0.60 | 166 | | | Includes | 43.67 | 45.00 | 1.33 | 1.15 | 0.81 | 209 | 2.98 | 0.20 | 0.31 | 0.66 | 213 | | 525016 | Sandy 1 | 36.80 | 40.50 | 3.70 | 3.64 | 1.32 | 80 | 2.15 | 0.09 | 1.59 | 2.47 | 174 | | | Includes | 36.80 | 38.09 | 1.29 | 1.27 | 2.65 | 169 | 4.40 | 0.12 | 1.56 | 2.19 | 305 | | 525017 | Sandy 1 | 43.50 | 46.63 | 3.13 | 2.94 | 4.25 | 30 | 4.56 | 0.15 | 0.91 | 2.34 | 283 | | 525018 | Sandy 5 | 146.95 | 153.78 | 6.83 | 4.83 | 1.92 | 2103 | 23.73 | 0.47 | 0.74 | 1.55 | 1,665 | | | Includes | 146.95 | 150.06 | 3.11 | 2.20 | 3.11 | 3940 | 43.97 | 0.91 | 1.17 | 2.56 | 3,090 | | 525018 | Sandy 1 | 164.50 | 167.25 | 2.75 | 2.25 | 0.96 | 120 | 2.20 | 0.19 | 0.15 | 0.36 | 151 | | | Includes | 165.75 | 167.25 | 1.50 | 1.23 | 1.48 | 158 | 3.11 | 0.19 | 0.23 | 0.54 | 207 | | 525019 | Sadie 2 | 35.04 | 38.22 | 3.18 | 2.88 | 0.93 | 116 | 2.13 | 0.02 | 0.05 | 0.11 | 135 | | 525019 | Sadie 1 | 60.83 | 65.36 | 4.53 | 4.26 | 0.92 | 220 | 3.19 | 0.05 | 0.30 | 0.64 | 218 | | | Includes | 63.00 | 64.11 | 1.11 | 1.04 | 0.88 | 570 | 6.79 | 0.10 | 0.36 | 0.88 | 475 | | 525020 | Sandy 5 | 137.89 | 142.48 | 4.60 | 3.52 | 2.05 | 1691 | 19.59 | 0.48 | 0.39 | 1.01 | 1,365 | | | Includes | 140.74 | 142.48 | 1.74 | 1.33 | 4.33 | 3543 | 41.08 | 0.88 | 0.72 | 1.94 | 2,853 | | 525023 | Sadie 4 | 54.77 | 56.63 | 1.86 | 1.80 | 0.49 | 396 | 4.60 | 0.03 | 0.03 | 0.08 | 314 | | | Includes | 55.34 | 56.63 | 1.29 | 1.25 | 0.67 | 543 | 6.30 | 0.04 | 0.03 | 0.11 | 430 | | 525024 | Sandy 5 | 120.22 | 126.90 | 6.68 | 4.72 | 0.88 | 538 | 6.46 | 0.15 | 0.34 | 0.66 | 452 | | | Includes | 120.22 | 122.00 | 1.78 | 1.26 | 1.96 | 1560 | 18.14 | 0.44 | 0.84 | 1.75 | 1,277 | | 525024 | Sandy 1 | 159.24 | 163.08 | 3.84 | 3.33 | 1.11 | 607 | 7.40 | 0.22 | 0.67 | 1.48 | 529 | | | Includes | 159.24 | 160.68 | 1.44 | 1.25 | 1.19 | 785 | 9.33 | 0.19 | 0.48 | 1.11 | 654 | | 525025 | Sadie 1 | 60.93 | 62.19 | 1.26 | 1.18 | 6.99 | 361 | 10.73 | 0.03 | 0.07 | 0.25 | 624 | | 525026 | Sandy 5 | 127.50 | 134.70 | 7.20 | 5.18 | 1.50 | 822 | 10.03 | 0.17 | 0.56 | 1.20 | 699 | | | Includes | 127.50 | 129.34 | 1.84 | 1.32 | 2.50 | 1477 | 17.82 | 0.35 | 0.71 | 1.67 | 1,238 | | 525026 | Sandy 2 | 147.60 | 151.47 | 3.87 | 2.95 | 0.68 | 808 | 9.06 | 0.17 | 0.18 | 0.51 | 635 | | | Includes | 147.60 | 148.53 | 0.93 | 0.71 | 1.11 | 1995 | 21.79 | 0.42 | 0.34 | 0.96 | 1,532 | | 525026 | Sandy 1 | 170.17 | 173.25 | 3.08 | 2.41 | 1.95 | 506 | 7.20 | 0.18 | 0.67 | 1.60 | 500 | | | Includes | 171.15 | 172.20 | 1.05 | 0.82 | 3.35 | 1035 | 14.08 | 0.28 | 1.39 | 3.06 | 982 | | 525027 | Sasha 1 | 105.40 | 109.50 | 4.10 | 3.36 | 0.14 | 168 | 1.87 | 0.05 | 0.08 | 0.22 | 134 | | | Includes | 108.09 | 109.50 | 1.41 | 1.16 | 0.26 | 391 | 4.32 | 0.11 | 0.20 | 0.44 | 308 | | 525028 | Sandy 2 | 193.65 | 200.37 | 6.72 | 5.15 | 0.45 | 154 | 2.05 | 0.02 | 0.06 | 0.16 | 138 | | | Includes | 198.10 | 199.23 | 1.13 | 0.87 | 0.74 | 239 | 3.22 | 0.02 | 0.09 | 0.23 | 215 | | 525028 | Sandy 1 | 203.57 | 207.85 | 4.28 | 3.28 | 0.52 | 312 | 3.76 | 0.01 | 0.11 | 0.20 | 256 | | | Includes | 205.22 | 206.35 | 1.13 | 0.87 | 0.88 | 716 | 8.30 | 0.01 | 0.27 | 0.49 | 571 | | 525029 | Sadie 2 | 34.70 | 36.53 | 1.83 | 1.80 | 0.89 | 817 | 9.36 | 0.07 | 0.31 | 0.98 | 654 | | | Includes | 34.70 | 35.80 | 1.10 | 1.08 | 1.25 | 1309 | 14.83 | 0.11 | 0.43 | 1.34 | 1,035 | | 525029 | Sadie 3 | 41.84 | 48.05 | 6.21 | 6.12 | 0.92 | 224 | 3.24 | 0.05 | 0.09 | 0.25 | 215 | | | Includes | 43.03 | 45.15 | 2.12 | 2.09 | 0.73 | 350 | 4.36 | 0.07 | 0.13 | 0.31 | 299 | | 525029 | Sadie 1 | 89.93 | 92.22 | 2.30 | 1.75 | 1.33 | 248 | 3.90 | 0.16 | 0.49 | 1.01 | 271 | | | Includes | 89.93 | 91.05 | 1.12 | 0.85 | 1.98 | 361 | 5.72 | 0.20 | 0.54 | 1.12 | 390 | | 525029 | Sasha 1 | 98.20 | 100.60 | 2.40 | 1.84 | 0.70 | 430 | 5.16 | 0.22 | 0.79 | 2.91 | 398 | | | Includes | 99.30 | 100.60 | 1.30 | 1.00 | 0.93 | 616 | 7.32 | 0.28 | 0.99 | 3.91 | 561 | | 525030 | Sandy 1 | 146.96 | 150.78 | 3.82 | 3.60 | 1.86 | 245 | 4.40 | 0.12 | 0.53 | 1.19 | 297 | | | Includes | 150.07 | 150.78 | 0.71 | 0.67 | 2.30 | 756 | 10.14 | 0.11 | 0.59 | 1.33 | 691 | | 525031 | Sadie 2 | 32.27 | 34.74 | 2.47 | 2.32 | 0.28 | 174 | 2.08 | 0.04 | 0.05 | 0.12 | 144 | | | Includes | 32.27 | 32.77 | 0.50 | 0.47 | 0.36 | 357 | 4.06 | 0.09 | 0.10 | 0.23 | 284 | | 525031 | Sadie 3 | 39.60 | 42.02 | 2.40 | 2.10 | 1.30 | 932 | 10.97 | 0.20 | 0.14 | 0.29 | 754 | | | Includes | 40.84 | 42.02 | 1.18 | 1.03 | 2.14 | 1771 | 20.51 | 0.31 | 0.22 | 0.48 | 1,412 | | 525032 | Sandy 2 | 140.26 | 143.00 | 2.74 | 2.57 | 1.11 | 91 | 2.06 | 0.12 | 0.62 | 1.39 | 151 | | 525033 | Sadie 2 | 34.31 | 37.59 | 3.30 | 2.84 | 0.94 | 854 | 9.80 | 0.08 | 0.38 | 0.91 | 684 | | | Includes | 34.31 | 34.90 | 0.59 | 0.51 | 2.93 | 3384 | 38.03 | 0.20 | 0.85 | 2.35 | 2,641 | | 525035 | Sadie 3 | 57.54 | 60.64 | 3.10 | 2.37 | 0.37 | 244 | 2.89 | 0.02 | 0.04 | 0.11 | 197 | | | Includes | 59.80 | 60.64 | 0.84 | 0.64 | 0.85 | 602 | 7.09 | 0.05 | 0.09 | 0.22 | 484 | | 525036 | Sandy 1 | 141.71 | 146.36 | 4.65 | 4.49 | 1.86 | 151 | 3.43 | 0.28 | 0.98 | 2.49 | 256 | | | Includes | 141.71 | 141.90 | 0.19 | 0.18 | 4.80 | 949 | 14.64 | 0.50 | 2.30 | 4.52 | 1,030 | | 525037 | Sadie FW | 42.78 | 44.94 | 2.16 | 2.03 | 0.74 | 227 | 3.09 | 0.02 | 0.05 | 0.11 | 204 | | | Includes | 42.78 | 43.62 | 0.84 | 0.79 | 1.85 | 561 | 7.67 | 0.02 | 0.09 | 0.26 | 505 | | 525038 | Sandy 2 | 148.58 | 151.52 | 2.94 | 2.66 | 1.28 | 245 | 3.81 | 0.14 | 0.37 | 0.88 | 263 | | | Includes | 148.58 | 149.80 | 1.22 | 1.10 | 1.75 | 367 | 5.56 | 0.15 | 0.55 | 1.29 | 382 | | 525040 | Sandy 1 | 163.14 | 166.90 | 3.76 | 3.53 | 3.72 | 1187 | 16.03 | 0.68 | 1.14 | 2.34 | 1,118 | | | Includes | 163.14 | 164.20 | 1.06 | 1.00 | 7.38 | 2310 | 31.34 | 0.91 | 1.65 | 3.80 | 2,151 | | 525042 | Sandy 1 | 167.10 | 174.33 | 7.23 | 6.79 | 0.56 | 412 | 4.83 | 0.49 | 1.03 | 2.48 | 388 | | | Includes | 170.16 | 171.06 | 0.90 | 0.85 | 0.05 | 1870 | 19.44 | 1.44 | 2.85 | 6.89 | 1,528 | | 525044 | Sandy 1 | 165.63 | 169.40 | 3.77 | 3.54 | 5.83 | 169 | 7.58 | 0.52 | 1.17 | 2.33 | 483 | | | Includes | 166.76 | 168.00 | 1.24 | 1.16 | 14.90 | 376 | 18.80 | 1.16 | 1.88 | 3.38 | 1,147 | | 525044 | Sandy 4 | 171.49 | 175.13 | 3.64 | 3.15 | 2.32 | 52 | 2.86 | 0.27 | 1.26 | 2.74 | 214 | | | Includes | 171.49 | 172.67 | 1.18 | 1.02 | 5.56 | 78 | 6.36 | 0.30 | 1.15 | 2.79 | 399 | | 525046 | Sandy 1 | 180.74 | 183.13 | 2.39 | 2.07 | 0.61 | 167 | 2.34 | 0.01 | 0.03 | 0.07 | 153 | | | Includes | 180.74 | 181.56 | 0.82 | 0.71 | 0.96 | 310 | 4.17 | 0.01 | 0.03 | 0.08 | 275 | | 525049 | Sandy 1 | 167.22 | 168.51 | 1.29 | 1.21 | 7.03 | 2417 | 32.10 | 0.40 | 1.04 | 3.27 | 2,174 | | 525051 | Sandy 2 | 154.95 | 156.00 | 1.05 | 1.03 | 3.52 | 1414 | 18.18 | 0.30 | 0.77 | 1.27 | 1,239 | | 525051 | Sandy 1 | 164.94 | 167.80 | 2.86 | 2.69 | 1.81 | 547 | 7.48 | 0.10 | 0.45 | 1.10 | 510 | | | Includes | 166.03 | 166.89 | 0.86 | 0.81 | 3.35 | 1304 | 16.87 | 0.22 | 0.45 | 1.34 | 1,144 | | 525052 | Candelaria | 70.72 | 71.29 | 0.57 | 0.49 | 5.37 | 3326 | 39.87 | 0.52 | 1.12 | 2.07 | 2,739 |
Quality Assurance / Quality Control
All samples from the 2025 ore-control drilling program were collected under the supervision of qualified geological personnel. Key elements of the QA/QC program include verifiable chain of custody for samples, regular insertion of certified reference standards and blanks, and duplicate check assays. Dill core was typically halved using diamond saws. Approximately two-thirds of the samples were prepped and assayed at the DDGM mine laboratory in Oaxaca, Mexico, while one-third were prepped and assayed at ALS Global, an ISO/IEC 17025:2017 and ISO 9001:2015, accredited and independent laboratory in Vancouver, Canada. A quarter-core duplicate of each sample sent to ALS was also assayed at the DDGM laboratory. No material discrepancies were identified between duplicate assay results.
At ALS, gold assays were performed using 30 g fire assay digestion with an atomic absorption spectroscopy (AAS) finish. Silver assays were performed using an aqua regia digestion of 0.5 g sample with an ICP-AES finish. Any sample exceeding 100 ppm silver was reanalyzed using an aqua regia digestion on 0.4 g of the sample, followed by an ICP-AES finish. Any samples exceeding 1,500 ppm silver were reanalyzed using a 30 g fire assay with a gravimetric finish. Samples were analyzed for copper, lead, and zinc using an aqua regia digestion of a 0.5 g sample with an ICP-AES finish. Any sample with copper, lead, or zinc concentrations exceeding 10,000 ppm was reanalyzed using ore grade determination methods. The DDGM mine laboratory utilizes industry-standard fire assay and multi-element digestion methods for gold and base metal analysis. While not ISO-accredited, the lab operates under established internal QA/QC protocols, and its results are routinely cross-validated against those from ALS Global.