55.5)- DERRICK FOR WATER WELL. In a old Coppermine (Ziccamina-Zaire) we have delivered a part of our drilling derrick know legde ,ie lowering a water pump upto 800 mtr depth well ,with interconnection riser pipes to the sur. face ,water for agricultur was pumped up. Our delivery was: Derrick ,30 mtr height SWL 800T. Draw works , diesel driven. Substructure for 1000T holding. Riser Pipes package.