From 1903 directories on
http://www.historicaldirectories.org1903 Part 4, suburban Directory
James Hiscox, collier, 19 Spencer St, Irlams O'th'Height, Swinton
and then in 1903 Part 2, alphabetical directory
James Hiscox, collier, 23 Stapleton St, Irlams O'th'Height, Swinton
These might be the two Migky found in 1911
Also 1909 directory
Mrs Eliz. Ann Hiscox, householder, 12 Denstone Rd, Pendleton
No other Hiscoxes - maybe your James retired from the mines and took to beer selling instead?

Barbara