Derrick /(?)/

Der·rick

Derrick

n.
  1. A mast, spar, or tall frame, supported at the top by stays or guys, and usually pivoted at the base, with suitable tackle for hoisting heavy weights, such as stones in building.
  2. The pyramidal structure or tower over a deep drill hole, such as that of an oil well (also called an oil derrick). (Mining)

Phrases & Compounds
Derrick crane
a combination of the derrick and the crane, having facility for hoisting and also for swinging the load horizontally.