Seeing that you're polling adding gems to the Prospector Percys store (passing at 90%+ atm) , would you also consider adding coal to the store? (Possibly costing 100 coals for 50 nuggets?)
Also, would you consider adding private instanced basement room to the mine, near the upstairs ladder, costing a large one-time payment of nuggets (perhaps 500-1000 nuggets)? Even upstairs tend to be full of miners these days and it can be hard to find a free spot.
31-Mar-2016 14:00:12