Gold Resource Corporation Reports H1 2025 Drilling Results and Operational Improvements at the Don David Gold Mine

DENVER--(BUSINESS WIRE)--Jul 30, 2025--

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.

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Plan View of H1 2025 Drill Holes

Highlights

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.

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

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.

Analytical results were reviewed for accuracy and precision by the Company’s Qualified Person. No material issues were identified during the verification process. Additional information regarding the Company’s data verification processes is set out in the S-K 1300 Technical Report Summary on the Don David Gold Mine Project, Oaxaca, Mexico, effective December 31, 2024 which can be found on the Company’s website.

Second Quarter 2025 Conference Call

The Company will host a conference call Wednesday, August 6, 2025, at 12:00 p.m. Eastern Time.

The conference call will be recorded and posted to the Company’s website later in the day following the conclusion of the call. Following prepared remarks, Allen Palmiere, President and Chief Executive Officer, Armando Alexandri, Chief Operating Officer, and Chet Holyoak, Chief Financial Officer, will host a live question and answer (Q&A) session. There are two ways to join the conference call.

To join the conference via webcast, please click on the following link:
https://onlinexperiences.com/Launch/QReg/ShowUUID=9408713A-18B6-4113-B697-6504F8C08A29

To join the call via telephone, please use the following dial-in details:

Please connect to the conference call at least 10 minutes prior to the start time using one of the connection options listed above.

About GRC

Gold Resource Corporation is a gold and silver producer, with its operations centered on the Don David Gold Mine in Oaxaca, Mexico. Under the direction of an experienced board and senior leadership team, the Company’s focus is to unlock the significant upside potential of its existing infrastructure and large land position surrounding the mine in Oaxaca, Mexico and to develop the Back Forty Project in Michigan, USA. For more information, please visit the Company’s website, located at www.goldresourcecorp.com.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Exchange Act of 1934, as amended. Forward looking words such as “plan”, “target”, “anticipate,” “believe,” “estimate,” “intend” and “expect” and similar expressions are intended to identify such forward-looking statements. Such forward-looking statements include, without limitation, (i) the potential of the Three Sisters and Gloria vein systems and the additional zones identified in the Arista and Switchback systems, (ii) the Company’s expectations regarding its drilling and exploration activities in 2025 and (iii) the Company’s expectations regarding the utilization of new mining methods, including with respect to recoveries, profitability and cash flow. All forward-looking statements in this press release are based upon information available to the Company as of the date of this press release, and the Company assumes no obligation to update any such forward-looking statements. Forward-looking statements involve a number of risks and uncertainties, and there can be no assurance that such statements will prove to be accurate. The Company’s actual results could differ materially from those discussed in this press release. Forward-looking statements are subject to risks and uncertainties, including delays or challenges in satisfying the closing conditions of the offering. Additional risks related to the Company may be found in the periodic and current reports filed with the Security and Exchange Commission by the Company, including the Company’s Annual Report on Form 10-K for the year ended December 31, 2024, which are available on the SEC’s website at www.sec.gov.

 

Cross Section B-B’ – Three Sisters System – Highlighting H1 2025 Drill Holes

Cross Section A-A’ – Three Sisters System – Highlighting H1 2025 Drill Holes

ABU DHABI, United Arab Emirates--(BUSINESS WIRE)--Jan 13, 2026--

The Zayed Sustainability Prize, the UAE’s pioneering award for innovative solutions to global challenges, today announced the cohort of 2026 winners, celebrating 18 years of empowering communities and driving inclusive, sustainable progress around the world.

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In a ceremony held during Abu Dhabi Sustainability Week (ADSW) and attended by Heads of State, Ministers, and business leaders, His Highness Sheikh Mohamed bin Zayed, President of the UAE, awarded the winners for their outstanding contributions to advancing sustainable development worldwide.

H.H. Sheikh Mohamed bin Zayed Al Nahyan said: “The UAE remains firmly committed to supporting efforts that enhance people’s well-being and strengthen the foundations of stability and progress around the world. The Zayed Sustainability Prize continues to encourage practical solutions that uplift communities and expand opportunity through innovation and cooperation. Through this enduring platform, we honour the legacy of Sheikh Zayed, whose vision of compassion, unity, and shared prosperity continues to shape a better future for all.”

H.E. Dr. Sultan Ahmed Al Jaber, UAE Minister of Industry and Advanced Technology and Director General of the Zayed Sustainability Prize, praised the winners for advancing scalable innovations that deliver tangible social and environmental benefits.

H.E. Dr. Sultan Ahmed Al Jaber said: “This year’s winners demonstrate how practical, real-world solutions can transform lives — from strengthening health and food systems to expanding access to clean energy and water. The UAE has long believed in connecting capability with need, and in building bridges across sectors and regions to deliver lasting, measurable impact. It is a conviction rooted in inclusive progress, and through the Zayed Sustainability Prize, this vision is translated into action by supporting innovations that put people first and open new pathways for growth.”

Since its establishment in 2008, the Prize has become a catalyst for impact, rewarding small and medium-sized enterprises, nonprofit organisations, and high schools that are addressing critical challenges across the six categories of Health, Food, Energy, Water, Climate Action, and Global High Schools. Through its 128 winners, the Prize has impacted over 411 million lives.

This cycle, a record 7,761 submissions were received from 173 countries, reviewed through a rigorous, multi-stage evaluation process by technical experts, the Selection Committee, and a distinguished Jury chaired by H.E. Ólafur Ragnar Grímsson, former President of Iceland.

H.E. Ólafur Ragnar Grímsson said: “The 2026 winners reflect a growing maturity in sustainability innovation — where technology, local knowledge, and execution come together. These solutions are designed to work in real-world conditions and to grow responsibly over time. They offer clear examples of how practical ingenuity, informed by experience, can strengthen access to essential services and improve everyday lives. As these approaches continue to expand, they point the way toward a more inclusive and effective path for sustainable development in the years ahead.”

In the Health category, Jade, an SME from the UAE, was honoured for reimagining neurodevelopmental screening through AI and play. Its gamified platform, combining cognitive assessments, eye-tracking, and personalised learning, is now used in over 450 institutions across 179 countries. By reducing diagnostic wait times and improving engagement, Jade has already supported more than 180,000 children worldwide and is setting a new benchmark for inclusive early intervention.

The Food category award went to N&E Innovations of Singapore, recognised for its breakthrough biodegradable antimicrobial packaging and coatings that extend food shelf life while tackling waste at its source. Made from upcycled food waste and plant-based ingredients, the company’s patented technology delivers 99.9% antimicrobial effectiveness, achieving bacterial counts 4.5 times lower than conventional materials. Food-safe, compostable, and circular by design, more than 400,000 sustainable packs have already reached consumers.

In the Energy category, Switzerland’s BASE Foundation was recognised for transforming how communities access sustainable cooling. Its Cooling-as-a-Service model eliminates upfront costs and makes low-carbon cooling both efficient and affordable. Operating in 68 countries, BASE has created 2,500 jobs, while its model saves 130 GWh of electricity and prevents 81,000 tonnes of CO₂ emissions per year, demonstrating how market-based innovation can scale environmental impact.

The Water category recognised Stattus4, an SME from Brazil, whose AI- and IoT-enabled technology helps utilities detect and fix leaks with unprecedented speed and precision. Monitoring more than 5,000 kilometres of distribution networks and identifying over 22,000 potential leak points, Stattus4 saves around 5.56 billion litres of water every day, strengthening water security for over four million people and transforming the efficiency of urban water systems.

In the Climate Action category, Build up Nepal, a nonprofit organisation from Nepal, was celebrated for reinventing brickmaking as a tool for climate resilience and economic empowerment. To date, the organisation has produced over 3.3 million earthquake-resistant eco-bricks and supported the construction of more than 12,000 resilient homes, creating nearly 2,000 green jobs, housing 58,000 people, and avoiding 110,000 tonnes of CO₂ emissions in the process.

Finally, the Zayed Sustainability Prize continues to empower the next generation of sustainability leaders through its Global High Schools category, enabling youth to turn local challenges into practical solutions that benefit their communities. Each year, six high schools representing the world’s regions receive up to US $150,000 to implement innovative, student-led projects that create meaningful social, economic, and environmental impact. To date, the Prize’s 56 previous Global High Schools winners have impacted the lives of over 56,599 students and 480,660 people across the globe.

The 2026 recipients of the Global High Schools awards are Mamawi Atosketan Native School (Canada), representing The Americas; Kyanja High School (Uganda), representing Sub-Saharan Africa; Al Rajaa School for the Deaf (Jordan), representing the Middle East & North Africa; Bodrum Anatolian High School (Türkiye), representing Europe & Central Asia; Faafu Atoll Education Center (Maldives), representing South Asia; and Ruamrudee International School (Thailand), representing East Asia & Pacific.

As the world accelerates its pursuit of sustainable development, the Zayed Sustainability Prize stands as a testament to the UAE’s holistic vision of progress driven by technological innovation and long-term economic growth. The Prize reflects the nation’s belief that true leadership lies in empowering others to lead, fostering collaboration among governments, enterprises, civil society, and youth to build a more prosperous and equitable world.

About the Zayed Sustainability Prize

The Zayed Sustainability Prize is the UAE’s pioneering award for innovative solutions to global challenges.

A tribute to the legacy and vision of the UAE’s founding father, Sheikh Zayed bin Sultan Al Nahyan, the Prize aims to drive sustainable development worldwide.

Each year, across the Health, Food, Energy, Water, Climate Action and Global High Schools categories, the Prize rewards organisations and high schools for groundbreaking solutions to our planet’s most pressing needs.

Through its 128 winners, in 18 years, the Prize has positively impacted over 411 million lives across the globe, inspiring innovators to amplify their impact, and chart a sustainable future for all.

Source:AETOSWire

The 2026 winners of the Zayed Sustainability Prize were recognised by the President of the UAE in Abu Dhabi on 13 January 2026 (Photo: AETOSWire)