Several coal seams are also exposed-these were mined commercially for bituminous coal between 1819 and 1958.
These were mined commercially for bituminous coal between 1819 and 1958. Several coal seams are also exposed.
Several coal seams are also exposed. These were mined commercially for bituminous coal between 1819 and 1958.
Several coal seams are also exposed. These were mined commercially for bituminous coal between 1819 and 1958.