The first, a $200 million contract awarded by Newcrest Mining, is for works at its mighty Telfer copper-gold mine in the Pilbara.

Under the 27-month contract, Leighton will provide mining equipment, operators, maintenance and supervisory personnel, and infrastructure including workshops and offices to the project.

The second is a three-year, $117 million contract for Crocodile Gold Australia at the Cosmo Deeps underground mine, located 140 kilometres south-southeast of Darwin and 50km northwest of Pine Creek.

This contract will start next month and covers 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.

There is also a provision for a contract extension, with the mine life currently estimated at 10 years.

Shares in Leighton were up 0.62% or 18c in morning trade to $29.16.