The Razorback Project will consist of a conventional large-scale open cut mining operation. Based on previous studies, due to the relative softness of the rocks mined and the long shape of the open pit, optimisation work has determined that IPCC (In Pit Crushing and Conveying) may be the appropriate mining method, which has significant operational advantages and lower OPEX.

Given the outcropping nature of the deposit, there is minimal to no overburden, therefore production can begin almost immediately. The current mine optimisation has determined the stripping ratio to be extremely low for life of mine to be 1: 0.24 at the Razorback Deposit.

Results suggested a standard magnetite flowsheet can be applied to the Razorback 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 gravity/hydro separation. The final product specification targeted, which is expected to command a premium price is shown below:

Razorback Concentrate Production Results

 Sample  Mass Rec  Rougher Rej%  Fe%  SiO2%  Al2O3%  P%  S%
 Sighter  16.2  54.3  68  4.22  0.43  0.01  trace
 Bulk  14.6  56.5  68.8  3.33  0.35  0.01  trace

(See ASX Announcement 27/06/16)

The Braemar Iron Formation mineralogy is unlike that of banded ironstones seen in the Pilbara and Mid West, Western Australia in that Braemar sedimentary rocks are not made up of fine grained chert, but rather magnetite-bearing siltstones. This has significant cost saving for Braemar in regards to having lower rock hardness and abrasion during beneficiation and mining.

Updated November 2018