Copper Concentrate Production

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Metallurgical Test Work Improves Gold Recovery to 85% (+22%) for the Whistler Gold-Copper Project, Alaska
Prnewswire· 2025-09-22 11:00
Core Viewpoint - U.S. GoldMining Inc. has announced promising results from its metallurgical test work program for the Whistler Gold-Copper Project, indicating that gold recoveries exceeding 85% are achievable, significantly improving upon previous results of approximately 70% [2][5][9]. Metallurgical Test Work Results - The 2025 metallurgical test program aimed to optimize metal recovery from drill core samples, resulting in an overall gold recovery of 85.3%, an increase of 22% from earlier tests [2][5]. - The combination of conventional flotation and sequential leach processes has been crucial in enhancing gold recovery [2][5]. - The program achieved recoveries of 79.1% copper and 55.3% silver alongside gold recovery [5][9]. Process Details - The test work involved a primary grind size of 120 µm and a secondary grind size of 16 µm, classified as 'Hard' to 'Very Hard' [4]. - A total of 28 flotation tests and four leach tests were conducted, providing essential inputs for the ongoing Preliminary Economic Assessment (PEA) [5][6]. Recovery Metrics - The locked cycle tests produced a copper concentrate with a grade of 23.7% Cu, with initial recoveries of 54.1% Au, 79.1% Cu, and 55.3% Ag [5][7]. - Additional leaching of the rougher flotation circuit tails resulted in a further recovery of 31.2% Au, contributing to the overall gold recovery of 85.3% [9][12]. Project Overview - The Whistler Gold-Copper Project is located 105 miles northwest of Anchorage, Alaska, covering approximately 53,700 acres [13]. - The mineral resource estimate for the project includes 294 million tonnes at 0.68 g/t AuEq for 6.48 million ounces AuEq indicated, and 198 million tonnes at 0.65 g/t AuEq for 4.16 million ounces AuEq inferred [13].