Business
Denison Mines Announces 97% Recovery from Long-Term Phoenix ISR Core Leach Test
TORONTO, Dec. 8, 2022 /CNW/ - Denison Mines Corp. ("Denison" or the "Company") (TSX: DML) (NYSE American: DNN) is pleased to announce highly successful results
About this update from Denison Mines Corp.
[{"type":"text","content":" TORONTO, Dec. 8, 2022 /CNW/ - Denison Mines Corp. (\"Denison\" or the \"Company\") (TSX: DML) (NYSE American: DNN) is pleased to announce highly successful results from long-term core leach metallurgical testing completed to further support the Feasibility Study (\"FS\") underway for the Phoenix In-Situ Recovery (\"ISR\") uranium mining operation proposed for the Company's 95% owned Wheeler River project (\"Wheeler River\" or the \"Project\"). To support the establishment of ISR production and recovery curves to be used in the FS, the Company completed a long-term test of a representative intact core sample (\"Core 4A\") using specialized equipment to replicate the in-situ leaching conditions of the Phoenix deposit. The results from long-term core leach testing of Core 4A are highlighted by the following: Overall recovery of uranium in excess of 97% – demonstrating excellent recovery of uranium from intact high-grade core, without the use of permeability enhancement. Average recovered solution uranium head grade of 18.3 grams per litre (\"g/L\") – exceeding the assumed 15 g/L uranium head grade being used in FS plant designs (see news release dated August 4, 2021). Continuous intact core leach testing over a period of 377 days, with uranium recovery head grades consistently maintained above 5 g/L during the final stages of the production curve and then declining during the ramp-down stage. Maximum recovered solution uranium head grade of 49.8 g/L achieved using similar lixiviant concentrations as to those used during the Feasibility Field Test (\"FFT\"). Kevin Himbeault, Denison's Vice President of Plant Operations & Regulatory Affairs, commented, \"The positive results of the long-term intact core leach test carried out on Core 4A add to the weight-of-evidence de-risking the use of the ISR mining method at the high-grade Phoenix uranium deposit. The ability to demonstrate the recovery of over 97% of the uranium from a high-grade intact core sample is quite positive and provides notable support for the estimated recovery value of 85% used in the 2018 Pre-Feasibility Study (\"PFS\"). Additionally, demonstrating an average uranium head grade of 18.3 g/L, over a year of testing Core 4A, provides furt...