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
which quarry was the last to open ?
WDT NN VBD-AUX DT JJ TO VB .
Brooke's
select c1 from w order by c3_number desc limit 1