📜 What This Document Is

This document is an 8-K filing, which is a mandatory report filed with the SEC to announce material events that shareholders need to know about immediately. Specifically, this filing is an Exhibit 99.1 that serves as a formal correction to a previous press release issued on April 21, 2026.

The reader should understand that the original announcement contained an error regarding which engineering firm completed specific work. This correction is vital because it clarifies the project timeline and assigns the correct responsibility for technical milestones on the mine site.

👉 In short, the company had to issue a correction to fix who did the engineering work and, consequently, when the next major report is due.

⛏️ What The Company Does

Hycroft Mining Holding Corporation is a U.S.-based company focused on exploring and developing the Hycroft Mine. This massive mine is situated in Northern Nevada, which is considered a "Tier-1 mining jurisdiction"—meaning it is in a stable, highly desirable location for mining investments.

The company's core business is finding, testing, and preparing large deposits of precious metals, primarily gold and silver.

• The Mine: The Hycroft Mine is known for being one of the world’s largest precious metals deposits.
• The Strategy: Hycroft is actively running a robust exploration drill program (scheduled for 2025–2026) to prove up its resources. In 2023, the company successfully announced the discovery of two new high-grade silver systems, which are key value drivers.
• Operational Shift: The company is also strategically planning a major shift. After a long history of surface operations (oxide heap leach), Hycroft is concentrating on technical studies to transition the entire mine into a milling operation to process sulfide mineralization.

🚨 The Technical Correction ⚠️

This section addresses the core reason the filing exists: a correction to the original press release. Companies must be precise with their statements, and the original document incorrectly credited the wrong firm with key engineering work.

The correction clarifies which firms completed specific tasks, which is a crucial detail for project management and funding.

• The Original Error: The prior press release incorrectly claimed that WestLand Engineering & Environmental Services, Inc. was the firm that finished the engineering work associated with the additional lifts on the tailings storage facility.
• The Correction: The actual firm that completed the engineering work for the additional lifts on the facility is WSP Global Inc.
• Role Clarification: WestLand Engineering & Environmental Services, Inc., is responsible only for completing the relevant environmental studies, not the engineering work on the facility itself.

📅 Project Milestones and Timeline ⏳

The completion of the environmental studies and engineering work triggers the next major technical milestone for the entire project. The next step is the creation of the Initial Assessment Technical Report, which includes crucial economic data.

This sequence of events shows the company is moving methodically toward a full operational assessment.

• The Next Step: Now that the necessary engineering and environmental work is done, Ausenco Engineering South USA, Inc. can complete the Initial Assessment Technical Report with economics.
• The Schedule: Hycroft anticipates that this full technical report will be complete during the second quarter of 2026.

🔄 Strategic Focus on Sulfide Milling 🌱

The filing provides context on the company's long-term technical vision. Understanding this shift from leaching to milling is critical to understanding the mine's future economic profile.

• Transition Goal: The company is focused on transitioning the Hycroft Mine from its previous method of oxide heap leach operations (a surface process) to a milling operation.
• Why It Matters: Milling operations allow the company to process and recover the deeper, more complex minerals called sulfide mineralization. This shift suggests the company intends to unlock a deeper and more technically intensive value source at the mine site.

📞 Important Contacts and Resources 🌐

If investors or industry partners need more information following this correction, the company has provided direct communication channels.

• Email: [email protected]
• Investor Relations Phone: 775-245-0564
• Website: www.hycroftmining.com

🧠 The Analogy

Think of a huge, complex building project (like building a skyscraper). Initially, you might hire the structural engineers to build the frame, and then separately hire environmental consultants to check the soil. If the original press release incorrectly announced that the environmental consultants were also in charge of building the structural frame, that would be a major problem. This 8-K acts like the construction foreman stopping work to issue a correction: "Hold on, the structural engineers (WSP) built the frame, and the consultants (WestLand) just checked the soil. Now, we wait for the chief architect (Ausenco) to finish the comprehensive blueprint (the Technical Report) before we can proceed."

🧩 Final Takeaway

The corrected filing simply fixes who is responsible for which technical tasks at the Hycroft Mine, making the operational timeline clearer. The critical takeaway is that Hycroft is moving into the final technical phase to assess the economics of developing the deeper sulfide minerals by Q2 2026.