Senegal-based microcap Haranga Resources Ltd (ASX: HAR) has kicked off leach testing from its Saraya uranium deposit, showing the potential for higher grades of the metal to be yielded from atmospheric leaching with either sulphuric acid than an alkaline solution.
Leaching with sulphuric acid picked up uranium at higher than 96 percent, while 84 percent was possible through an alkaline atmospheric leach.
The samples used came from diamond core which reflected the mineral resource estimate (MRE) at Saraya of 587 parts per million (ppm) triuranium octoxide (U3O8), but Haranga managed to achieve a head grade that was 14 percent higher than this.
Managing Director Mr. Peter Batten said there had been no surprises with the testing.
“The first results from the ore characterisation testwork are positive, as expected,” he said.
“The acid leach recoveries are pleasingly high, but this was an aggressive test to assess what the limits are.
“The next work will pare back the aggressive parameters and give a clearer indication of what could be expected in processing of the Saraya mineralised episyenite.
“The alkaline leach results are also good and gives Haranga two options to consider, if and when we enter feasibility studies for the Saraya Uranium Deposit.”
Leaching work was undertaken by Canadian group SGS Lakefield and supervised by Independent Metallurgical Operations (IMO) in a program of ore characterisation, which commenced in March 2024.
Haranga is trading at 12c.