name mineral opened closed years connected notes
name
mineral
opened
closed
years connected
notes
number parsed year
number parsed year
minimum_number minimum_parsed minimum_year maximum_number maximum_parsed maximum_year
text text date date timespan text
blaen y cwm slate 1820 1911 1876-1911 connected to the ffr via the rhiwbach tramway
how many years was the cesail mine connected ?
WRB JJ NNS VBD-AUX DT NN NN VBN .
41
select c5_maximum_number - c5_minimum_number from w where c1 = 'cesail'