Study on the efficiency of gravity beneficiation method on gold bearing ores from Lega Dambi and Sakkoro deposits by using Laboratory Scale Shaking Table
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Date
2023-09
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Addis Ababa University
Abstract
This study focuses on the investigation of the efficiency of a gravity separation as pre - concentration for a gold samples taken from Laga dambi openpit, and Sakkorro underground gold mine by using Shaking table concentrator. The bench-scale test work was performed on samples taken from Midroc Lega Dembi gold mine, Ethiopia to provide information on the gravity recoverable gold (GRG) content and the optimum size range for gravity concentration, and gold distribution by using a shaking table concentrator, to determine the efficiency of gravity method as a pre-concentrate by using shaking table. The GRG test was perfom1ed at entire sample passing (P100) through 2000 µm, 710 µm, and 500 µm sieve aperture at first, second and third sages respectively. Fire assay analysis was undertaken to determine the content of gold element in the shaking table products.The results of GRG test have indicated that 17.11% , 19.73% , and 27.44 % of the GRG from the ground ore were recovered into a concentrate at first, second, and third stages respectively. Totally about
64.29 % GRG was recovered into concentrate from three-stage tests for the gold ore samples taken from Lega Dembi and Sakono gold mine. The International standards (I.S) sieves having the following narrowing sieve sizes: 2000µm, 140 µm,1000 µm,710 µm, 500 µm, 355 µm, 250 µm, 150 µm, 75 µm, and pan were selected to conduct size analysis. The cumulative gold distribution obtained from the three stage concentrates size analysis was indicated that an approximately 85%, 69%, and 53% of the available gold was contained at the average size of 112 µm, 200 µm, and 302 µm respectively. However the cumulative GRG distribution shown that only 47.38%, 24.23 %, and 12.96 % of the GRG was recovered into concentrates of shaking table at the mean size of 112 µm, 200 µm, and 302 µm respectively. These indicated that the gravity separation was not effective to pre-concentrate the Lega Dembi, and Sakorro gold ore at relative coarse paiticle sizes by using shaking table concentrator.
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Gravity recoverable gold, pre-concentration, gravity separation, shaking table concentration