RZOLV Technologies Successfully Completes Bulk-Scale Vat Leach Test at Operating Gold Mine, Advancing Commercial Validation of RZOLV Non-Cyanide Gold Extraction

Executive Summary

• RZOLV Technologies completed a 73.5‑tonne bulk‑scale vat leach test at an operating gold mine in Arizona, achieving an overall gold recovery of 67.51 % over 40 days.
• The test demonstrated that the non‑cyanide RZOLV™ leach solution scales predictably from laboratory to bulk conditions, with stable solution chemistry, consistent reagent consumption, and effective carbon adsorption.
• Design‑ready data (flow rates, residence times, reagent demand, equipment sizing, preliminary cost inputs) were generated, materially advancing the company’s ability to evaluate commercial‑scale deployment.

Key Details

• Test Scope: 73.55 t of low‑grade oxidized gold mineralization processed in a lined vat leach configuration; feed crushed to –½ in (12.5 mm) +18 mesh (1 mm).
• Recovery Performance: Overall gold recovery 67.51 %; pregnant solution Au concentration 1.12 ppm (≈68.8 g Au); tailings Au 0.450 g/t (32.49 % loss).
• Solution Chemistry: pH and ORP remained within target ranges throughout; no precipitation, compaction, or channeling observed.
• Carbon Adsorption: Effective gold adsorption onto conventional activated carbon confirmed; doré production and weight matched calculated carbon loadings.
• Kinetic Comparison (Lab vs. Bulk): Early‑time leach kinetics comparable to or faster than cyanide; 48‑hr dissolved Au concentrations 1.48–1.55 g/t (RZOLV) vs. 0.98–1.02 g/t (cyanide).
• Design Data Generated:
• Solution flow rates & inventories
• Residence‑time distribution
• Reagent consumption & oxidant demand
• Carbon loading/stripping behavior
• Equipment sizing envelopes
• Preliminary operating cost inputs
• Environmental Controls: Fully closed‑loop circuit; all process solutions captured, recycled, and managed on‑site with no discharge to surface or groundwater.
• CEO Commentary (Duane Nelson): Emphasized the test as an “important inflection point,” validating metallurgical recovery, solution stability, hydrodynamics, reagent behavior, and carbon performance under real‑world conditions, and providing strong technical support for further commercial evaluation.

Notable Quotes

“This bulk‑scale vat leach test represents an important inflection point for RZOLV… The predictable scale‑up behavior observed in this program provides strong technical support for further commercial evaluation.” – Duane Nelson, President & CEO

Materiality Assessment: Material – Positive (the results materially advance the company’s commercial prospects and provide substantive, positive technical validation).