The aim of this study is to evaluate the cleaning amenability of coal of selected areas of salt range through washability analysis and gravity concentration
techniques including jigging, shaking table and spiral.
The manganese ore was tested for its susceptibility to beneficiation through gravity concentration
magnetic separation and flotation techniques.
In October of 2012, Ireland successfully installed all of the gravity concentration
equipment and determined the operating parameters for the concentration components of the on-site precious metals extraction circuit.
Flotation combined with gravity concentration
can be used to recover 83% of the gold and 87% of the copper into saleable concentrates.
Unit processes will include primary jaw crushing; single-stage semi-autogenous grinding with recycle to produce an 80% passing 75-p grind size; gravity concentration
and removal of coarse gold from the milling circuit recirculating load; pre-leach thickening; a leach/ carbon-in-leach circuit incorporating a leach tank and six carbon-in-leach tanks for gold adsorption; an elution circuit treating loaded carbon; electrowinning; and gold smelting to produce dore.
The outcome from the programme suggests the resource could be economically treated using standard Gravity Concentration
/ Carbon in leach (CIL) cyanidation technology.
Because of the high specific gravity of the tungsten minerals, they are amenable to gravity concentration
In South Africa, the company has added to stockpiles, bringing the total stocks of materials for processing to 44,050 oz, equating to four years of current woodchip production capability, three years of gravity concentration
capacity and three years of leach capacity.
This concentrate will pass through a gravity concentration
circuit comprising a Knelson concentrator and a Gemini table to recover the free gold, before being reground to nominally 100% minus 75 microns and pumped to the flotation circuit.
The gravity concentration
circuit has been fully commissioned, while testing of the leaching and resin extraction circuits are underway.
These results were achieved by testing a master composite representing mineralized material from the Meio and Serra zones of the Project using gravity concentration
followed by carbon-in-leach (CIL) cyanidation of the gravity tails.
The synergistic effect of combining flotation with gravity concentration
results in an outcome that cannot be achieved by either approach alone, according to the company.