Phase 4 Metallurgical Column Leach Results And Final Phase 5 Metallurgical Drill Assays At Black Pine Oxide Gold Project

Phase 4 Metallurgical Column Leach Results And Final Phase 5 Metallurgical Drill Assays At Black Pine Oxide Gold Project

VANCOUVER – Liberty Gold Corp. reported on the Phase 4B and 4C metallurgical bottle roll and column testing of gold mineralization in 36 variability composites taken from the Black Pine Oxide Gold Project in southeastern Idaho.

36 variability composites from the Phase 4B and 4C test programs were selected from large-diameter (”PQ”) drill core from Discovery Zone, F Zone, Tallman, M Zone, and C/D Zone, representing a range of sample types across lithology and gold (“Au”) grade. Key results include: 1) 84.2% weighted average gold extraction1 from column leach tests for the 31 oxide composites. 2) Gold extractions ranged from 52.7% to 94.2% for the oxide composites. 3) >80% of leachable gold extracted within 10 days.

Metallurgical testwork results on 149 composites and six bulk samples over five years are highly consistent, showing rapid leach kinetics, predictable grade-recovery and size-recovery relationships. Phase 5 composite selection and sample preparation is under way on an additional 25 variability composites from previously untested areas.

Jon Gilligan, President & Chief Operating Officer for Liberty Gold said, “The results of this latest phase of metallurgical column testwork add key infill data to the gold recovery model at Black Pine. The consistency of results across all phases of test work is encouraging and demonstrates the predictable nature of gold recovery across this extensive Carlin-style oxide gold system. With more than 150 columns completed the test results provide a strong level of confidence for the proposed run of mine heap leach processing approach.”

Phase 4B and 4C composites and the pending Phase 5 variability test program filled gaps in the Black Pine resource metallurgical database. The Phase 4B and 4C data have updated the metallurgical recovery equations supporting the deposit-wide gold recovery model. Phase 5 initial results are expected in Q2 2024 and will support the on-going pre-feasibility engineering and economic study at Black Pine.

Phase 4B focused on gap filling in Discovery Zone, E-Pit, F Zone, Tallman, I-Pit and M Zone, sampling across rock types, gold grades and geo-metallurgical zones with 25 composites taken. Twenty (20) of these composites represent typical oxide (database Au cyanide solubility > 65%) material at Black Pine, while 5 additional composites were made up to test leach recoveries in lower gold solubility oxide materials (Au Cyanide solubility between 25% and 65%). Bottle roll and column leach test results are in linked table below.

Phase 4B column tests produced the following results: Oxide material produced a weighted average 86.1% gold extraction, with a range from 56.9% to 94.2% gold extraction.

Phase 4C focused exclusively on the C/D Pit area with 11 composites of oxide gold mineralization taken. Phase 4C column tests produced the following results: A weighted average 73.4% gold extraction, with a range from 52.7% to 89.8% gold extraction.