Arizona Gold & Silver Reports Up To 99% Gold Recovery From Agitation Leach And 84% Gold Recovery From Heap Leach Cyanide Processing Of Bulk Sample From The Philadelphia Project, Arizona

Arizona Gold & Silver Inc. (AZS) announced successful gold and silver recovery results from agitation leach and heap leach cyanidation tests conducted by Kappes, Cassidy & Associates (KCA) on a bulk sample from its Philadelphia gold-silver project in Mohave County, Arizona. The tests demonstrated high recovery rates for agitation leaching and viable projections for heap leaching, with HPGR crushing showing significant advantages over conventional methods.

Agitation leach tests achieved high gold recovery rates of 91-99% on modest grind sizes (0.40-0.136mm), with low reagent consumption. Silver recovery in these tests ranged from 49-72% on the same grind sizes. Reagent consumption was recorded at low levels, with cyanide consumption between 0.08-0.21 kgs/tonne and lime consumption at 0.5 kgs/tonne. Extractions reached up to 99% depending on particle size, with finer particles yielding higher extractions.

Heap leach tests using High Pressure Grinding Rolls (HPGR) crushing demonstrated an 84% gold recovery over a 177-day cycle, with projections suggesting 86% recovery over 360 days. Silver recovery via heap leach was 37%. Material crushed to -6.3mm was found to be amenable to stacking heights of 10 to +30 meters with 2-4 kg/tonne of cement added. HPGR crushing exceeded conventional third-stage crushing by 12% in gold extraction and by 3% in silver recovery. This performance is attributed to HPGR generating microfractures and finer particles, allowing better cyanide access to gold sites.

Column leach tests using -6.3mm HPGR crushing achieved higher gold recoveries of up to 84%. Reagent consumption in these column tests included approximately 2 kgs/tonne of cement, 1 kgs/tonne of lime, and 2.2-2.34 kgs/tonne of cyanide. KCA indicated that actual operational reagent consumption would be only 25-33% of laboratory column test consumptions.

The bulk sample was sourced from a fresh bench cut at the current surface operation on the Philadelphia property. It weighed 415.5 kilograms and was assayed with gold grades of 1.929-1.988 g/t and silver grades of 2.82-3.34 g/t. These grades are higher than the target 1.0-1.2 g/t gold due to the presence of fine and wire gold particles.

QA/QC for the project was supervised by Ing. Eugenio Iassillo of Process Engineering LLC and KCA management. Samples were transported under strict chain-of-custody, and assays were performed by Florin Analytical Services, an independent lab within the KCA group. Gregory Hahn, Vice Chairman and Certified Professional Geologist (#7122), approved the technical information under NI 43-101.

Commenting on the findings, the company stated: "The results demonstrate the attraction of treating higher grade material by agitation cyanide leach, where higher silver grades accompany higher gold grades in the deposit, and treating the lower grade material by heap leach processes using HPGR crushing."