The JK Drop Weight Test is an industry standard for use in characterising ore under AG/SAG milling conditions. The JK Drop Weight Test provides ore specific comminution parameters which are used to analyse and/or predict crusher and AG/SAG mill performance. This allow mining companies to optimise current circuits or flowsheet design for new circuits. Developed at UQ’s JKMRC in 1992, the JK Drop Weight Test is a single particle breakage test across 15 size/energy combinations.

Sample Requirements: 100 kg of crushed rocks in  -63+13.2 mm size range.

The SMC Test® is a cost-effective means to predict comminution circuit throughput, rock mass characteristics and blasting properties. Developed by Dr Steve Morrell, the test is able to predict the energy requirements for crushing and HPGR options can now be determined in addition to AG/SAG mills and ball mills. The results from conducting the SMC Test are used to determine the so-called drop-weight index (DWi) which is a measure of the strength of the rock. The DWi is measured in kWh/m3 and is directly related to the JK breakage parameters, A and b, which are used in JKSimMet for design and optimisation of AG/SAG Mill circuits. Is relatively easy to carry out and is always used in place of the Bond BMWI test for SAG Milling. The Bond BMWI has no correlation with the throughput or power requirements of a SAG Mill. The SMC Test® is carried out on samples from each ore domain and in conjunction with a full JK Drop Weight Test for correlation purposes.

Sample Requirements: 20 kg of -32 +16 mm. The length of core required for the two methods are shown in the table below.

For larger diameter core, greater lengths are required for the cut core method. Half core, quarter core and crushed rock can also be used. Lengths in the above Table must be multiplied by a factor of two for half core and four for quarter core, respectively.

The Integrated JK Drop Weight & SMC Test was created to combine two industry standard tests into a single test for use in characterising ore under AG/SAG milling conditions.

The Integrated JK Drop Weight Test provides ore specific comminution parameters which are used to analyse and/or predict crusher and AG/SAG mill performance. This allows for optimisation of current circuits or flowsheet design for new circuits. Developed at JKTech in 2012, the Integrated JK Drop Weight & SMC Test is a single particle breakage test across 17 size/energy combinations.

Sample Requirements: A minimum of 120 kg of  -63+13.2 mm.

The abrasion test measures the resistance of the sample to abrasion breakage. The standard abrasion test tumbles 3 kg of 55 x 38 mm material in a 300 x 300 mm mill for 10 minutes at 70 % critical speed (53 rpm). The resulting product is then sized and the t10 value for the product is determined.

Sample Requirements: A minimum of 10 kg of -63 mm.

The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill. It can be used to determine the grinding power required for a given throughput of material under ball mill grinding conditions. It is a ‘locked cycle’ test conducted in closed circuit with a laboratory screen.
The Bond Ball Mill Work Index can be used in the design calculations and simulations of a new grinding circuit. A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s).

Sample Requirements: A minimum of 10 kg of – 3.35 mm.