Inspired by the above image from DNR's "The Crossing" and this thread, I give you this robot:
Deepnight Fuel Extraction Rig
Basics
: Hits: 32
: Locomotion: Walker
: Speed: 1 m
: TL: 12
: Cost: 3.5 MCr
Skills
: Athletics (endurance) 3, Athletics (strength) 4, Weapon () 1, Heavy Weapons (portable) 0, Profession (labourer) 2
Attacks
: PGHD-12 (Very Bulky)
Manipulators
: 1 X (STR 20 DEX 7)
Endurance
: 605 hours (25 days)
Traits
: Armour (+12), ATV, Large (+3), (idle), Hardened
Programming
: Basic (labourer) (INT 4)
Options
: Drone Interface, Transceiver 5 km (improved), Visual Spectrum Sensor, Video Screen (basic), Wireless Data Link, Vacuum Environment Protection, Transceiver 5000 km (enhanced), Self-Maintenance Enhancement (basic), Atmospheric Sensor, Corrosive Environment Protection, Insidious Environment Protection, Radiation Environment Protection, Submersible Environment Protection 2000 m (advanced), Satellite Uplink, Mining Equipment (large), External Power, Cutting Torch (improved), Fire Control System (basic), Weapon Mount (heavy)
This massive robot is designed to extract hydrogen from ice or frozen volatiles. Four legs spread out from a central core, which contains the mining equipment and a plasma gun to facilitate melting. While slow moving, it is extremely stable and capable of operating in any hostile environment.
The robot can extract 25 tons of hydrogen an hour. The Revelation carries four of these.
Note: The 25 tons/hour extraction is not even close to what the Robots Handbook uses for mining equipment. I back calculated that from what it would take to refuel the Revelation in the time discussed on p. 36 of "The Crossing", hand wave the result as being the result of ice being softer than rock, and having the plasma gun to assist.