2.1.1. Geological prospecting work for uranium and thorium ores carried out by surface measurements that do not require shafts or underground mining works:
2.1.1.1. Operation (performance) of geological prospecting work for uranium and thorium ores carried out by surface measurements that do not require shafts or underground mining works.
2.1.2. Geological prospecting work for uranium and thorium ores that requires shafts or underground mining works: