marceagleye
Underground Economist
A road or other improvement need not be built on a tile containing a strategic resource for it to exhaust... Once I discovered refining and found four oil resources in my territory, but only one oil tile had a road on it when the resource(s) first appeared. The very next turn, one of the oil tiles that was unimproved exhausted the resource even though I had no road there and couldn't even use oil any way until I discovered combustion...