It ain’t the moving of the rock, it’s the placing it where you need it and in the necessary amount of time that makes a helo more than worth the money!
Back in 1981, Chevron had a CH-46 hauling gabions (similar to chain link fence bags) full of rock to make drill rig foundation pads in the swamps of southern Sudan.
Big Bucks, but the only realistic way to do the job.