Police are currently in attendance of an incident at Hodge Close Quarry, Coniston.
A Cumbria Police spokesman said: “A local man in his 30’s is currently unaccounted for.
“His family have been made aware.
“Emergency services including police, ambulance, mountain rescue and fire, attended the scene to support the investigation.
“Police will remain in the area for the foreseeable future and a cordon is in place around the area whilst investigations continue.”