Not too knowledgeable, but main shaft is 250 ft to bottom and 230ft to get off at level with lots to see, climbing shaft is about 30 ft followed by 30/35ft to first level and then 140ft to the 230ft level. Interesting shaft hidden in wood of Hopton Quarry is 180ft and will drop you onto first level again - these are from memory which is rapidly fading, be warned!