Farm mines numbers 1 and 2

Owners JS Smallshaw & GW Tarr
Farm number 1 Coal 1929 - 1944. Workers Under Ground -- | surface --
Farm number 2 Coal ???? - 1955. Workers Under Ground 23 | surface 7

1928 Map

The 1928 map shows the mines as old shaft so they may be being reworked or I may have the wrong Grid Reference?