To admin:
So I don't think the referral system is capturing the referrals properly, I know of at least 1 member who I referred but my number of referrals still states zero. Do they only show up after they have accrued a specific amount?
Im sorry for the problem it had caused you, developer is aware of those issue and i believe its fixed, kindly let me know which player did you refered to the game soo i can fix those.
Remember all there still running the referal contest, this month, and all new players will get resorces to upgrade the time between captchas( this will allow you to make captcha every 35 minutes instead of 5 minutes).
This is the first round and soo far the results arent bad, since just some active members in game, but i believe as the first revenue share between members happens this will change, and bring players back in game.
As said before you can full upgrade your mine into 1-2 months as the free time you have, there is no limit how much you can earn playing this game, since it will share always the revenue generated from all of you.
Remember all that which achieve 10000 gold in game will get a boost of resorces to let you upgrade faster.