Disclaimer: Guide was written after 500+ resets and with a significant amount of souls invested in artifacts. The consequence of sending (wrong) heroes to the mine at a significant lower level could have major impact to normal lvl progression for the time they are stuck in the mines. Please verify YOUR gameplay impact by sending heroes to the low level mines to minimize possible consequences.
Currently I have 36 heroes in the mine and most of them will most likely stay in the mine on a “permanent” basis. Even with these heroes in the mine I have not experienced any loss of level progression (just a couple of lvls) and no impact on either PVP or boss fights. Level progression based on tapping did however take a hit, but that is something that I rarely use.
Any hero:
used in “The Great Clan Mine” fights (hitters, buffers, debuffers, etc)
with skills
that might be part of daily quests
used in lvl progression
used for rarity upgrades
gives bonus to events
you would like to send to altar
should not be sent to the mine. They will be stuck and be useless for the “activities” above and the only way to get them back is by using time travel or wait it out.
At 4k lvl and with 9 teams permanently in the mine, this would give 600+ emeralds on average each day (if you do watch the 5 videoes and get at least one round of free time travels through quests).
Without any use of time travel, the result would of course be completely different and you would end up with 182 emeralds per day. Still a significant number and will result in that you get your end game heroes faster.
However, keeping the clan mine is still (possibly more) important, so remember that you should be able to do your part here.
None of the heroes below Prenax in your hero list should be sent to the mine due to their bonus to the Event (unless you do not care about that)
This contains skill giving heroes (middle menue) and DPC heroes (important in Arena and scorebosses), as well as buffer type heroes you will often use in Clan mine, so only use it if you have Time travels to do or want to make use of the mines while you're absent of the game. Other wise proceed with caution! The daily gift will be available from Skweel even if in mine.
Careful with spending bottles, but this can help if you're 500 shards off of the next bigger pack.
Base chance 95%
Use catalysts!