First things first    You can't mine outside your own hex on the sanctuary mine.  So detect first, then place your sanctuary territory unit.   Switch on your light with L.  This gives you your depth and and your orientation degree. 0 is flat.   Investing in jump pack and run speed; this will make leaving a mine immeasurably easier.   Invest in nanopack inventory size.  This will help you mine for longer.   Invest in mining skills, obviously.