Mooney was rewarded in the summer for his impressive performances in the Cod Army`s under-18 side last season with a professional contract.
The 18-year-old was called up to the Wales under-19 squad to face Iceland whilst on loan to Evo-Stik League North outfit Bamber Bridge earlier this season.
He had signed for Brig initially for a month, but that was later extended.
He impressed playing against Chorley in a Lancashire County FA Cup tie which the Magpies won 2-1 late on.