Extension Of High-Grade Silver At Brimstone System

WINNEMUCCA, NV – Hycroft Mining Holding Corporation (HYMC) reported drill results from the 2025-2026 exploration drill program at the Hycroft Mine, located in Nevada, USA a Tier-1 mining jurisdiction.
Diane Garrett, President and CEO commented: “These latest drill results are very exciting and continue to demonstrate the scale and potential of the targets we are exploring. With every hole we drill, our understanding grows, and the broader story continues to unfold. We remain focused and disciplined as we carry out the important work ahead to fully unlock Hycroft’s potential.”
Drill holes 6074, 6075, and 6075X were completed within the Induced Polarization (IP) geophysics anomaly to test the down-dip extension of the Brimstone high-grade silver system targeting the fluid pathway and stockwork veining. The holes were drilled in a zone between the east-west trending structures (MD_AD and Nicholes faults) in close proximity to the IP anomaly. All three holes showed strong geochemical signatures, silver mineralization, and stockwork veining consistent with the high-grade silver mineralization observed at the Brimstone system. Results confirm Brimstone remains open at depth and laterally.
The farthest step out hole, H25D-6075, drilled approximately 150 meters down-dip from the high-grade Brimstone system, returned 11.2 meters of 385.15 g/t silver, confirming the extension of high-grade mineralization at depth. Holes H25D-6074 and H25D-6075X (wedge / directional drilling hole of H25D-6075) also returned anomalous silver grades and displayed alteration and geochemical markers commonly associated with alteration from a magmatic intrusion indicating we are still in an intermediate sulfidation system. This is consistent with the high-grade Brimstone geochemistry and alteration package observed to date.
Drilling is continuing to test the deeper portions of the Brimstone system including the potential feeder target. In addition, the lateral extents of the Brimstone system remain open. These ongoing efforts are intended to further define and scale the continuity of the Brimstone system.
A total of 11 holes were completed in 2025 (7 in Brimstone and 4 in Vortex) and all assays have been received with the exception of one Vortex hole that is pending. To date in the 2026 drill program, 6 core holes have been completed (4 in Brimstone and 2 in Vortex) with assays pending. There is currently one core rig at Brimstone and one core rig at Vortex with two additional core rigs arriving over the next few months.