Only thing I would add here is that the Quarry at Creetown is a ‘Granite Quarry ‘ and looking at the photo it would appear that the masons are looking at potential gravestones.
At the present time, the Quarry is worked on a needs must basis.
I.e someone wins a contact for crushed granite, a mobile crusher is brought in and then the crushed granite chips are moved from the Quarry. Either by lorry, or sometimes, using a Sea freighter.