I have gone through XML editing and have been looking for how to increase chances of getting marble on the random map that comes when you start the game. I have always felt marble is too scarce in the game than it needs to be.

Can anyone tell me how to change map generation program so that you see marble (or for that matter any resource) more often on the map

Thanks

The answer is near the bottom of this thread (http://forums.civfanatics.com/showthread.php?t=153584). Search for iConstAppearance.