Disappearance Probability (Resource Properties)
Determines the frequency with which the selected resource can disappear from the map (simulating the effects of "using up" a resource), forcing players to find a new source of the resource. A value of 800 would mean that there is a 1 in 800 chance each turn to "lose" the resource. Setting this value to zero means the resource will never disappear.
Note that this value is not influenced by use; a resource can disappear even if a civilization has never used the resource.
Note 2: "Lost" resources will always re-appear somewhere else on the map, so the fundamental amount of resources in a game world will never drop below the amount set in the appearance ratio.