History of Wigan   (Help with ancient and recent history.)

On reading some historical notes, I found that there was a small graveyard associated with the former St. Paul's Independent Chapel in Hindley, that's the one that's now a fishing tackle shop, I think that this was in the 1820s-30s or so, before the present building was erected. I haven't seen any records of re-interment anywhere, not at All Saints or Hindley Cemetery at least. Is it possible the graves are still there?