Envirogold talks phase 2 Greens Creek tailings testing

Executive Summary

• Envirogold Global Ltd. completed Phase 2 of its structured test work program on tailings from Hecla Mining Company's Greens Creek mine in Alaska, identifying Hecla as the previously confidential counterparty.
• The results confirm the technical suitability of the Greens Creek tailings for Envirogold's proprietary NVRO process, demonstrating near-complete oxidation of sulphide minerals and strong liberation of contained metals.
• Phase 3 pilot plant optimization and Phase 4 demonstration-scale processing are underway, with a bulk sample currently being shipped to the company's West Australian facility to support techno-economic modeling and commercial evaluation.

Key Details

• Counterparty Identification: The North American Tier 1 customer previously referenced in confidentiality agreements is identified as Hecla Mining Company.
• Recovery Rates: Phase 2 results achieved high recovery rates, specifically 98.07% for silver and 99.46% for gold.
• Process Validation: The test work confirmed the technical suitability of the tailings for the NVRO process, showing near-complete oxidation of sulphide minerals.
• Current Activities: A bulk sample of feedstock from Greens Creek is being shipped to Envirogold's West Australian project development facility.
• Future Phases:
  • Phase 3: Pilot plant optimization.
  • Phase 4: Demonstration-scale processing.
• Objectives of Future Phases: Optimize process operating conditions, validate saleable product quality and value, evaluate waste stream characteristics and operating parameters at industrial scale, and generate engineering data for techno-economic modeling.
• Project Potential: Subject to further study, approvals, and commercial arrangements, the project aims to recover silver, gold, base metals, and critical minerals from sulphidic tailings while reducing long-term environmental liabilities associated with legacy mine waste.
• Historical Context: The tailings contain mineralization that was not recovered during the facility's 35-year operational history.

Notable Quotes

• "The test work results clearly demonstrate the NVRO process has the potential to unlock significant metal production from mineralization contained in Greens Creek's tailings facility, material that was not recovered in prior milling activities over the facility's 35-year operational history," said Grant Freeman, chief executive officer.
• "We are grateful to Hecla for the opportunity to assess their tailings and the potential commercial opportunity."