Size fraction assaying of gold bearing rocks (for gold extraction) by instrumental neutron activation analysis
AbstractA novel method has been developed for processing and extraction of gold from gold bearing rocks for use by small-scale gold miners in Ghana. The methodology involved crushing of gold bearing hard rocks to fine particles to form a composite sample and screening at a range of sizes. Gold distribution in the composite sample was determined as a function of particle size by using Instrumental Neutron Activation Analysis. The concentrations of gold for the corresponding particle sizes were 16.4 ± 0.17 mg/kg for sizes < 63 μm; 161 0.75 mg/kg for 63 - 125 μm, 0.53 ± 0.03 mg/kg for 125 - 250 μm, 4.66 ± 0.07 mg/kg for 250 - 355 μm, 1.55 ± 0.06 mg/kg for 355 - 425 μm, 0.80 ± 0.008 mg/kg for 425-1000 μm, and 1.27 ± 0.05 mg/kg for 1000 - 2000 μm. The average gold content in a 7.127 kg compo-site sample based on particle size was found to be 3.80 mg/kg.
Journal of Applied Science and Technology Vol. 10(1&2) 2005: 91-96
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