The mod causes ore deposits to regenerate themselves if they run out of resources, i.e. the deposits are infinitely mineable. It works automatically for every modded ore as long as they are labeled as "resource". Liquids are just held on their initial richness so they won't go low. The mod is UPS friendly; even if your PC has (!) really low specifications, it should not cause any problems. Can be added/removed in savegames without problems, just keep in mind that after removing the mod, the deposits will typically have a few thousands of ore left. If you need any support with the mod you can always write me in the discussion thread (most of the time I'll answer you on the same day).