.. made the same mistake to look for the large mines, but a claim is small and can only noticed by the very small (pink, reddish?) oblisks which display the owners names in the text message when you come close to it.
I would rather see to have different resolution options, since the smallest iMac already comes with a 20" screen and even though you have to support smaller screen sizes, you should not forget about the larger ones ;-)
Thanks for the great game, btw
Jan Fuellemann