• Black Sheep Diggers presentation - March 29th 7pm

    In the Crown Hotel Middlesmoor the Black Sheep Diggers are going to provide an evening presentation to locals and other cavers.

    We will be highlighting with slides and explanations the explorations we have been doing over the years and that of cave divers plus research of the fascinating world of nearby lead mines.

    Click here for more details

Operation Mole Mines Research and Exploration Group Contact Details?

The CDG Peak District Sump Index Update 1997 says, of Watergrove Mine, that extensive pumping was necessary to work the mines. However in the 1974 drought the pumps pulled air. Doug Nash was in an Op Mole party which forced the rarely unwatered passages. He was back there in the 1976 drought, pushing a low airspace section along the sough - but turned back when his pipe went out!

I remember sitting in Glebe Cottage listening to Doug describing these trips and in particular how clay was being squeezed out from cracks in the walls like toothpaste, due to the rock moving as it was no longer being supported by the water. Scary!

None of the above really helps answer the OP's question but perhaps it serves as an example to give some idea of the amazing stuff which Operation Mole members got involved with.
 
I remember sitting in Glebe Cottage listening to Doug describing these trips and in particular how clay was being squeezed out from cracks in the walls like toothpaste, due to the rock moving as it was no longer being supported by the water. Scary!
Off subject, but that reminds me of the time when we removed some clay blockages from Hebden Horse Level, dewatering the passage upstream, and progressed as far as a sump. After a few weeks we dragged some bottles in, only to find that that the sump had disappeared and we were walking over slabs that had fallen in from the roof.

The problem now is that the newly exposed carbonaceous shales are oxidising in the air, and the area has become very CO2 heavy.

We should have left well alone!
 
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