The PFS and optimisation studies included extensive metallurgical testing and pilot processing. Results suggested a standard magnetite flowsheet could be applied to the Razorback Iron Project.
Crushing consists of a single stage gyratory crusher feeding a crushed product stockpile with tunnel conveyor reclaim feeding two modules each with one SAG mill and two ball mills. The ore is ground to 45µm and passed through a rougher and cleaner Low Intensity Magnetic Separator. Final product upgrading is achieved using spirals. The final product specification targeted, which is expected to command a premium price (currently USD$4/Fe%/t over 62% Fe over the Pilbara Fines) and is low in deleterious elements is shown below:
Much of the comminution testing suggested the Razorback Iron Project material to be softer than magnetite projects of the Mid West and Pilbara regions, Western Australia, which has positive effect on OPEX.
Updated November 2013