Access to the underground workings at the La Camorra mine is via a ramp from the surface, excavated at a -15% grade and connecting numerous levels.
Access to the underground workings at the La Camera mine is via a ramp from the surface.
The original statement says that the mine is called La Camorra, not La Camera.
( z1 access :ARG1 ( z2 work :location ( z3 underground ) :location ( z4 mine :name ( z5 name :op "La" :op "Camera" ) ) ) :instrument ( z6 ramp :source ( z7 surface ) ) )