Gold Resource Corp Unveils 2024 Drill Results

New Vein System With Higher Grades Adds to Future Potential

DENVER--BUSINESS WIRE--

Gold Resource Corporation (NYSE American: GORO) (the "Company") is pleased to announce a summary of the 2024 exploration drill results at the Companies Don David Gold Mine ("DDGM") in Oaxaca, Mexico.

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Cross-section looking northwest at the North Arista, Three Sisters and Switchback vein systems with 2024 drill holes.

"We are excited to share the positive results of our 2024 exploration drilling program that indicate that the Three Sisters and Gloria vein systems will be significant contributors to our future resource at Don David," stated Allen Palmiere. "The discovery and definition of the system is exciting and is a testament to our team's dedication and expertise. These new vein systems have the potential to not only add to our resource potential but to also will enhance our bottom line with improved accessibility and reduced production costs. Underground development has recently intersected the system and the sample results thus far have confirmed the previous drill results. We remain committed to developing this system into the future mine plan and further advancing our exploration efforts with the goal of maximizing shareholder value and organic growth."

2024 EXPLORATION SUMMARY

The 2024 exploration drill program focused on underground infill and expansion drilling within the Three Sisters and Gloria vein systems as well as in veins of the North Arista system. Significant vein widths and grades identified through drilling have reinforced the emergence of the Three Sisters and Gloria systems as a major third vein system at DDGM, located between and north of the Arista and Switchback systems. The program yielded encouraging results, which were included in the updated S-K 1300 Technical Report Summary for DDGM released on March 5, 2025 (the "Report"), further demonstrating the potential of these vein systems.

The Company believes that the mine has significant potential to generate positive cash flow from the new areas of Three Sisters and Gloria, as well as other areas that have been discovered near the existing mining zones. These new vein systems offer easily accessible resources, situated close to the current mine portal and at significantly higher elevations than current production areas. The location of these vein systems should result in reduced haulage costs and reduced total production costs. In order to develop access and better define these new areas, an investment must be made in additional equipment and development.

2024 Drill Results: The exploration program included 23 underground infill and expansion drill holes, totaling 7,671 meters of diamond drilling at DDGM. Notable high-grade intersections were identified, advancing our exploration objectives by confirming the continuity and quality of polymetallic mineralization up-dip and along strike. The program confirmed and upgraded mineral resources from previous drilling campaigns within the Three Sisters and Gloria vein systems as well as in veins of the North Arista system. The Company expects to conduct additional exploration development in 2025 to enable further infill and expansion drilling to the northwest of the current defined vein extents in the Three Sisters/Gloria zone.

Below are select 2024 exploration infill drill results, including Gold Equivalent¹ ("AuEq") and Net Smelter Return² ("NSR") values from the Three Sisters and Gloria vein systems. All drill hole length composites are presented as Estimated True Widths³ ("ETW") in meters.

• Hole No. 524001: Sandy 1 vein
  • 6.85 m with 3.40 g/t AuEq and NSR value of $242/t
    • Includes: 2.07 m with 6.71 g/t AuEq and NSR value of $476/t
• Hole No. 524005: Sandy 2 vein
  • 4.70 m with 15.53 g/t AuEq and NSR value of $966/t
    • Includes: 2.01 m with 21.08 g/t AuEq and NSR value of $1,298/t
• Hole No. 524005: Gloria vein
  • 3.00 m with 7.67 g/t AuEq and NSR value of $535/t
    • Includes: 1.22 m with 16.47 g/t AuEq and NSR value of $1,142/t
• Hole No. 524008: Gloria vein
  • 12.30 m with 4.77 g/t AuEq and NSR value of $348/t
    • Includes: 3.71 m with 6.17 g/t AuEq and NSR value of $487/t
• Hole No. 524011: Sandy 1 vein
  • 8.03 m with 1.04 g/t AuEq and NSR value of $152/t
    • Includes: 4.58 m with 1.35 g/t AuEq and NSR value of $199/t
• Hole No. 524011: Sandy 2 vein
  • 3.89 m with 6.22 g/t AuEq and NSR value of $435/t
    • Includes: 3.13 m with 9.20 g/t AuEq and NSR value of $632/t
• Hole No. 524015: Sadie 2 vein
  • 6.00 m with 5.53 g/t AuEq and NSR value of $405/t
    • Includes: 3.14 m with 9.70 g/t AuEq and NSR value of $691/t
• Hole No. 524027: Sadie 2 vein
  • 4.48 m with 16.65 g/t AuEq and NSR value of $1,073/t
    • Includes: 1.01 m with 36.10 g/t AuEq and NSR value of $2,314/t
• Hole No. 524031: Sandy 2 vein
  • 8.72 m with 5.03 g/t AuEq and NSR value of $347/t
    • Includes: 1.39 m with 25.09 g/t AuEq and NSR value of $1,667/t
• Hole No. 524042: Sadie 2 vein
  • 5.33 m with 10.26 g/t AuEq and NSR value of $666/t
    • Includes: 1.98 m with 13.77 g/t AuEq and NSR value of $893/t