April 3 (Reuters) - Macmahon Holdings Ltd MAH.AX :
* CONFIRMS THAT GBF UNDERGROUND MINING SERVICES BUSINESS HAS FINALISED AND SIGNED CONTRACTS WITH SILVER LAKE RESOURCES
* CONTRACTS TO EXTEND GBF'S TENURE AT MOUNT MONGER TO MARCH 2023, AND WILL ADD ABOUT $200 MILLION TO ITS ORDER BOOK
* DOES NOT CURRENTLY SEE A NEED TO CHANGE ITS GUIDANCE FOR FINANCIAL YEAR
* WILL DELAY SOME PREVIOUSLY PLANNED CAPEX SPENDING TO ENSURE APPROPRIATE LIQUIDITY BUFFER