Mines/Mining for Class-D

make the mines spawn more ore as well as let us have different equipment (eg; drills, scanners, GPS, etc…)
as well as add different areas such as different mines with different requirements, such as randomly generated caverns and secret areas.

No need. Once you unlock deep caverns ore prices go up (so does the spawning rate)

I did, im talking about improving deep caverns or providing more ways to get money as CD’s