Augmenting more conventional gravity separation capabilities at AARL, a pilot scale In-Line Pressure Jig (IPJ) was recently installed. This unit is a fully continuous and enclosed jig, working under moderate pressure. Claiming more regular flow than normal jigs, this unit can treat materials normally considered too fine for jigging. Having been successfully introduced in the gold industry in Australia, at which application it was originally targeted, the unit is also showing its mettle in coal, base metals and other areas.

Particular interest exists in its potential to replace rougher spirals in gravity separation plants, due to its high throughputs and controlability. For example, concentrator feed may be upgraded to allow sub-economic material to be removed before expending unnecessary effort on it, or waste rock fines can be upgraded to derive value and minimise acid mine drainage.

The manufacturer of the In-Line Pressure Jig - Gekko Systems - received the 2002 Clunies Ross National Science and Technology Award from Mr John Howard, the prime minister of Australia, for the development of this unit. AARL have built up a good working relationship with the supplier of this technology, ensuring that the work done with our unit reflects the best possible result, useful to both concentrator and supplier, for rapid application to full scale.