SAG and AG Mill

Your operation requires cutting-edge solutions with high throughput to enhance productivity and profits. We have designed our SAG and AG Mills with your specific needs in mind. Our team of highly-skilled engineers continually upgrades designs for the consistently most cost effective and robust SAG and AG Mill solutions for your operating needs.

Since the early 1990s, we have been designing and manufacturing Semi Autogenous (SAG) and Autogenous (AG) Grinding Mills.

SAG and AG Mills operate by lifting ore/grinding media and dropping it on the operating bed of the mill charge. High impacts from lifting ore and media promote impact breakage which is the primary mechanism for size reduction in the mill. Via the use of sophisticated instruments and software, we closely monitor the mill impact location to boost the grinding efficiency of your operation.

The mills can be operated in open circuit, feeding downstream secondary grinding, or operated in closed circuit as single stage mills generating a finer product size. Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity.

Amstar SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW. Our team of product engineers continually improves SAG/AG Mill designs in order to provide the most robust, safe, and efficient grinding mills available.

Key Design Features

• Robust head castings and shell fabrications resulting in low stress levels and longer operating life
• Mill designs are supported by a full suite of design analysis reports including rotating body finite element analysis, main bearing fluid film analysis, drivetrain steady state torsional analysis as well as gearless mill dynamic modal analysis and system stiffness analysis
• Gearing rated to the latest proven AGMA standards
• High value lubrication systems with potential for flywheel rundown circuits (eliminating nitrogen accumulators)