Untouched Ores disappear "permanently", if you leave the area.
Asteroids fail to respawn ores of unsaved "sections". edited areas retain spawned ores, but all other ores in the roid, will load as stone when you return after leaving.
steps to reproduce:
1: find a new roid
2: confirm it has a ore deposit using sight or ore detector (do not mine nearby)
3: modify a part of the roid a significant distance away from the ore deposit
4: move far away from the roid and/or save and exit the world.
5: return to the roid and/or load the save.
6: the Ore deposit should have vanished (turned to stone), and the edited part remains edited (including retaining any nearby ores.)
I Strongly suspect the code is regenerating parts of the roid (that were not saved), but not spawning the ore deposits in the process.
relevant posts:
I have the same bug
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