The calculated distance (air line) between Bochum-Hordel and La Calamine is approximately 74 miles respectively 119 kilometers.
By car or train, the actual journey to La Calamine is certainly longer, as only the direct route (as the crow flies) between Bochum-Hordel and La Calamine has been calculated here.
Air line (approximately)
119 kilometers
64 nautical miles