The Ore Refinery is very useful, when it's upgraded 3 times, it only takes 2 ores to make a building stud which is an equivalent to 5 ores, it's not just useful for quick building, it also helps to use ore more efficiently.
Lots And Lots Of Energy Crystales
When you play Frozen Frenzy drill north then stop send a rock raider up the passage stop there drill south keep drilling from thst and you will find about 100 energy crystles :) :) Note: When you find the 100 energy crystles lots of ice monsters come out.
If you dont want a slimy slug sucking energy from
your buildings turn off the power on it. Then
they will go away!
In the mission rocky horror go north to hard rock
drill that and you'll find a bunch of energy
crystals which will help you on that last mission.
Transport Down More Men
If you want to transport down more men, build more support stations.