I currently have 1,247 mines in Spark Quest, of which I've converted 456 of them into factories as well to help me produce PWR Crystals which will be an important part of this game moving forward.
As of right now I'm continuing to re-invest all of my crystals into more PWR factories just for the sake of being able to produce as many of these crystals as possible.
Not all of my factories are maxed out just yet at 5/5 for both REGEN and FACTORY but they all have 5x crystals for FACTORY at a minimum to be able to keep producing more crystals.
The hope is that I can even have factories on all 1,247 mines and continue to add them any time I add a new mine into the game as I buy more properties inside of Upland.
Then I'm hoping I'll also be able to sell a bunch of these crystals too because they seem to be selling pretty well right now. A lot of work left to do though on this to reach my goal.