I usually sneak up to the top of that tall mining machine, placing mines as I go up, then I just snipe at them using an AM Rifle with either explosive or Armor Piercing rounds.
At some point I tried setting up a massive trap by placing Fat Mines, Plasma Mines, C4 and other explosives in a huge line in the middle of the quarry, then I had the Deathclaws chase me across the line of explosives. Long story short, only three deathclaws were killed, and I was knocked down to about 30 hit points, which made it easy for the other deathclaws to kill me before I could even open my pipboy.