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All that remains is a concrete block in the middle of a playing field.
The plaque read :-
FILLED UPSHAFT, DEPTH 90 METRES, DIAMETER 3.4M, SHAFT FILLED AND CAPPED 1986
A second shaft was close by, all that remains of that is a slight indentation in the field.

There is not much left at Boosbeck. I have walked across this site before and not really appreciated the fact that significant industrial activity took place here. However having the Google Earth facility on the website really is excellent. A close up view will highlight the location of sidings etc and the overall site layout (in the form of earthworks) which would otherwise not be appreciated.
Close inspection reveals an area of concrete on the ground about 8 feet from the monument. This could be either a cap to another possible shaft or most probably the remnants of the base of a building.