The first one is a $200m contract awarded by Newcrest Mining for works at Telfer, a gold mine in Western Australia.
As per the 27-month contract, Leighton Contractors will provide mining equipment, operators, maintenance and supervisory personnel, and infrastructure including workshops and offices to the project.
The second is a three-year, $117m contract for Crocodile Gold Australia Operations at the Cosmo Deeps underground gold mine in the Northern Territory.
This contract, commencing in April, will see the provision of complete mining services, including short-term scheduling, diamond drilling, decline and level development, ground support installation and shotcreting, production drilling, blasting and haulage.
The company said that there is also provision for a contract extension, with the mine life currently estimated at 10 years.
