There appears to be an error on CWGC as Joseph Mincham does not exist anywhere, but there are a number of Joseph Minchin.
1903 Jan 22 Born Oldbury,Worcestershire, son of Benjamin Minchin and Sarah Goodwin
1911 census living at Back 57, Portway Road, Oldbury
coal miner Ilkeston, Derbyshire
1920 Dec 17 Died in Michelstown Ambush
buried Ilkeston Park Cemetery