Kingman Minerals Ltd. has achieved a preliminary 93.5% overall gold recovery and 82.3% Gravity Recoverable Gold from metallurgical testwork on material collected from its historic Rosebud Mine in Arizona.

The testing, conducted by Sepro Laboratories, evaluated a Master Composite derived from 165.8 kilograms of mineralized rock gathered underground across 24 individual samples. The composite returned a head grade of 12.52 grams per tonne gold and 60.5 grams per tonne silver. Sepro attributed significant grade variation among the underlying samples to a nugget effect reflecting heterogeneous gold distribution.

Under gravity concentration test conditions using a Falcon L40 centrifugal concentrator, the material yielded a concentrate grading 379.97 grams per tonne gold. Subsequent rougher flotation of the gravity tailings recovered an additional 61.9% of the gold and 55.2% of the silver. Combined gravity and rougher flotation produced a concentrate grading approximately 53.4 grams per tonne gold and recovered about 63.1% of the contained silver.

“The testing demonstrated a strong gravity response, with 82.3% of the gold reporting to the gravity concentrate under the GRG test conditions. The subsequent rougher flotation testing demonstrated that a significant portion of the remaining gold could also be recovered by flotation.”

“The results are encouraging for a project at this stage because the combination of high gravity recoverability, rapid flotation kinetics and strong overall preliminary recovery provides a solid basis for further metallurgical optimization and mineralogical investigation,”

— Jalal Tajadod, Senior Mineral Processing Engineer, Sepro Mineral Systems

Kingman engaged Burgex Mining Consultants to execute underground sampling at the historic workings to supply material for the test program and subsequently staked 121 additional lode claims, expanding its holdings around the Rosebud site to 192 lode claims totaling 1,216 hectares.

The company holds approval for an additional 16-hole exploratory drill program at the Mohave Project and plans to pursue further metallurgical optimization, cleaner flotation, and potential leaching of flotation tailings. These technical milestones establish a foundation for ongoing engineering and evaluation work across the property.

Read the full announcement: Kingman Reports 82.3% Gravity-Recoverable Gold and 93.5% Preliminary Gold Recovery from Rosebud Metallurgical Testing