# Arizona Gold & Silver reports up to 99% gold recovery at Philadelphia project

Page: https://stenobird.com/podcast/proactive-interviews-for-investors-1457173/arizona-gold-silver-reports-up-to-99-gold-recovery-at-philadelphia-project
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Podcast: [Proactive - Interviews for investors](https://stenobird.com/podcast/proactive-interviews-for-investors-1457173)
Published: 2026-06-30T17:27:21+00:00
Episode link: https://proactive-interviews-for-investors.simplecast.com/episodes/20260630-arizona-gold-and-silver-VS1_8wOt
Audio file: https://cdn.simplecast.com/media/audio/transcoded/1068c7db-2e26-4675-9674-33cc0c49ccdc/b96906c8-b386-47e4-a142-589b24379f8e/episodes/audio/group/5acfd562-9bcf-4552-b46e-151f7b6ba41e/group-item/681357c5-4d46-4e0b-a5db-b93ed042c368/128_default_tc.mp3?aid=rss_feed&feed=xjpdm5C9
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Duration seconds: 148

## Resource

Arizona Gold and Silver CEO Mike Stark joined Steve Darling from Proactive to discuss encouraging metallurgical test results from the Philadelphia gold-silver project in Mohave County, Arizona, highlighting strong gold recoveries through both agitation and heap leach processing. Stark said agitation leach cyanidation achieved gold recoveries of 91% to 99% using modest grind sizes of 0.40 to 0.136 mm (40–110 mesh). More than 50% of the total gold was recovered within the first 10 days of column leaching, demonstrating rapid extraction characteristics. Heap leach testing also delivered positive results, with 84% gold recovery from bulk material crushed to -6.3 mm using high-pressure grinding rolls (HPGR) over a 177-day leach cycle. Regression analysis indicates recoveries could increase to approximately 86% over 360 days. Silver recoveries ranged from 49% to 72% through agitation leaching, while heap leach processing achieved 37% silver recovery. Testing also showed that HPGR crushing improved gold recovery by 12% compared with conventional crushing methods, while silver recovery improved by approximately 3%. Agglomeration and compaction testing demonstrated that the crushed material is suitable for heap stacking heights of 10 to more than 30 metres with the addition of only 2 to 4 kilograms of cement per tonne, supporting the project's heap leach potential. Based on the results, management believes higher-grade material could be processed through agitation cyanide leaching to maximize gold and silver recovery, while lower-grade ore could be treated economically through HPGR-assisted heap leaching. The metallurgical work was conducted on a 415.5-kilogram bulk sample collected from the current surface operation. Head assays returned 1.929 to 1.988 g/t gold and 2.82 to 3.3…

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