FLSmidth has acquired MIE Enterprises and Mayer Bulk.
It comes just months after FLSmidth acquired fellow Australian minerals processing and engineering company Ludowici.
While the company has declined to disclose the value of these most recent acquisitions, it did state that the companies will "complement [its] regional Customer Service set up".
The two companies, Mayer Bulk and MIE, currently operate in the Australian and South East Asian mining industries.
Both companies provide construction, commissioning, maintenance and repair services.
"MIE serves the market for specialised mechanical services of high technical complexity, while Mayer Bulk's specialist expertise is centre on the design of mobile machines, cranes, and material handling structures," FLSmidth said.
The two acquired companies together have a workforce of 200 employees in service and construction, as well as 20 engineering staff.