All Open Pit mines have water pumps as standard infrastructure.
If I recall FFX acquired the infastructure/plant when they bought Morila, so likely pumps was included.
Having said that the installed pumps are not likely rated to pump the volume of water needed in time. However since FFX will have to buy pumps for Goulamina, they could bring forward the purcase than relocate it. Meaning no wasted capital.
To keep the pump talk in perspective cost of few pumps would not be material, it makes as much sense as asking how much did the 4wd cost FFX and who is operating it lol