Abandoned mine
Abandoned mine produces resources like any other mine, except it cannot produce wood. The production is chosen randomly at the beginning of the map. However, the mapmaker can set which resources are available for lottery. So if only one resource is chosen, the production becomes fixed.
Abandoned mine is guarded by a horde (50–99) troglodytes. The guards are renewed at the first day of every week. So if another player flagged the mine on seventh day of the week, there are new set of troglodytes guarding the mine if another player tries to flag it.