I am now a full trainer and assessor for the BCA mine leader scheme within North Wales. The scheme allows instructors who hold the award to take and lead others in underground slate and lead mines within North Wales. These mines are all old non working mines and are as the miners left them when they closed.
The mines get inspected each year or every two years by a mines inspector regards the mines safety and the inspector will inform users of where they can and cannot go.
I got a good run around around a large mine in Yorkshire, just what an assessment should be !! Hard work, enjoyalbe and able to learn.