mining is fine as long as there is storage and bots available for pick up. However, once either of them isn't then the ores are simply left on the ground. i had 100k-300k ores on the ground and I was wondering why my ups was 45 for a very starter base.
I identified and fixed a bug. If you enough bots to mine 300 items per second, the game would get stuck creating more ore items and not picking them up. The game will now spend more time assigning jobs for very large bases.