Crystal Mine

An another crystal income with limitations.
- Geogolists can find crystal mine. (Find crystal deposit: 8hours, like granite)
- Only one crystal mine would be on your island.
- Crystal mine contains only 7 crystal
- Production time 1 crystal/24 hours.
- Crystal mine upgradeable and refillabe only with gems (10 crystal - 290 gems same calculation like in The excelsior airship)
- Crystal mine buffable

With 5x buffs, this means +35crystals / week.
This is not too much, but would make crystal economy unbalanced (see [Dev Blog] Excelsior) problems with gems. If you have too much crystals you can spend too much on letters, and you can earn too much free gems. If they can fix that balance problem (maybe limitation on gem income / week) then that crystal mine would be more powerful.

It's all very well suggesting additional means of obtaining crystals but free gems is not the only problem with the rewards affecting game balance. What about the demands upon your army and in turn upon your economy. There is no point in more rewards than you can use. Then there is the catch 22 situation where gaining extra crystals actually forces you in to needing more crystals.

Some will never be satisfied...

Free gems are unfair at all, es example for me in my country I have no chance for any single gem, + the free gems is for who sacrifice his email for spammers, for who don't want spam, he will not get free gems.

It's not related to suggestion, but I had to say it since you mentioned it.

Returning to suggestion, I'm nature not +1 nor -1 .

Nooooo, how many -1 am I allowed?