Mills Technical Data

The following technical data sheets show some of the standard Ball Mills and SAG Mills that we have available.

mill in operation
We can supply Ball Mills, SAG Mills and other milling systems to your specific requirements given your particular technical specifications.

The selection and type of mill you require, FAG, SAG, SABC, rod or ball, is at best difficult, and depends on ultimately on test work performed for your application.

However we can guide you in initial mill selection from our experience and database of applications.

Large Mill
The first parameter to be established is to obtain the most accurate indication of the particle size requirements from the milling process, given your feed material. To be able to assess the grindability of the ore, the best indicator is the ore’s Bond Work Index, which will define the power requirements per tonne of rock to achieve the required product specification from the mill.

This sets the basic power draw for your mill application and can then be used to simulate the various milling options and stages that maybe required for the downstream processing steps.

Other considerations are the variability of the ore, with for instance depth.
The mine may commence operations as an opencast pit, producing a weathered ore, which as the pit deepens and then goes underground, the ore becomes more competent.

To be able to recommend suitable mill applications the results from representative test work are preferred, or reference to similar applications that have been brought to production and optimised.

Type – References, Ball Mills over 5m Diameter since 2004
Large Mill

Diameter mm Length mm Application Quantity
5030 6400 Iron and Steel 5
5500 8500 Copper 2
5000 6400 Copper 1
5030 6700 Iron and Steel 6
5030 6700 Iron and Steel 3
5030 6700 Copper 2
5030 7000 Copper 2
5030 6400 Gold 1
5030 6400 Gold 1
5030 6400 Mongolia 3
5030 6400 Iron and Steel 2
5030 6400 Molybdenum 3
5500 8500 Gold 1
5500 8500 China 2
5030 8300 Kyrgyzstan 2
5500 9200 Chrome 2
5030 8300 Iron ore 1
6000 9500 Iron ore 1
5200 9500 Iran 2

mill in transit
Type – References, SAG Mills over 5.5m Diameter since 2004

Diameter mm Length mm Application Quantity
5500 1800 Russia 2
5500 1800 Gold 3
6000 3000 Iron ore 1
6000 3000 Zhongtie 3
8800 4800 Iron ore 1
9200 4000 Iran 2

Once Bond Work Indices have been determined, the values are used to calculate the specific power to perform the required duty, where the following;
E= specific power, kWh/t
WI = Bond Work Index
P80 = 80% passing size of circuit product in microns
F80 = 80% passing size of circuit feed in microns

Where this can be given by the equation;
E = 10 x WI x ((P80)-1/2– (F80)-1/2)

mill under construction
To be able to give you a proposal and references to similar applications, could you please supply us with the following preliminary information;

  • type of ore to be crushed
  • bond work index for the feed material
  • abrasion index for the feed material
  • maximum particle size of the feed to the mill
  • required F100 and F80 of the crusher product
  • percent moisture in the feed
  • proposed method of feed and discharge from the mill
  • permanent, modular or mobile application
  • available power source
  • required operating hours per month
  • stand alone operation or integrated in to larger plant system
  • battery limits for the installation

If this information is not available, a general description of your project or application will allow us to make preliminary
recommendations and develop the specific application requirements as more information is available.