Agnew was the first mine in Australia to integrate large-scale wind energy.
Expansion expected to maintain current workforce and full production activities until 2033.
Decision had been expected after a maiden resource was reported last month
Announcement comes almost a year after first gold pour at the operation.
"The pandemic in our country is now at its most devastating," president Cyril Ramaphosa said.
DD212 promises a 20% reduction in boom positioning time.
Company has appointed ABH Engineering for work at Bull River.
MineProtect also includes operator alertness, personal alert and tracking radar.
Work on Las Chispas process plant will begin in February.
The new system can process a wider range of particle sizes.
Construction is expected to start as early as this month.