Oil Shale

Oil Shale is used to refuel the Drilldozer in Escort Duty.

Oil Shale can be mined with the Drilldozer Fuel Canisters or broken into chunks with other tools, such as the Pickaxe or Bosco. It can be collected only with Fuel Canisters where it refuels said fuel canisters. It cannot be picked up by dwarves, and therefore, cannot be deposited on the mule.

Sometimes, during the Drilldozer's path, it may break some oil shale, which can be useful for refueling it since broken chunks of oil shale will fall to the ground.

Appearance
Oil Shale appears in large formations of glowing dark teal oil shale. It is visible without any light due to its glow.

Locations
Oil Shale can be found in any biome during the Escort Duty mission type.