Mining and construction contractor Macmahon Holdings Ltd has negotiated a $100 million extension to the contract at the BMA Coal Operations in Queensland. The original contract covered two years with a total value of $75 million and the company had completed the first year of this contract. The extension involves the removal of additional material over the next two years and represents an increase of more than $100 million on the original contract value. Chief executive Nick Bowen said the extension will result in the excavators being upgraded to larger sized units and the addition of four new trucks. Macmahon has a workforce of 200 personnel at the site and operates a fleet of four excavators and trucks.