I think that has gone now, or to be more precise is under a lot of rubble. The final section of sough ran in at some point between 1996 and 2006, the 1950s timbering just wasn't built to last.....
Back to the shale gates - a quick visit to Sheffield local studies this lunchtime to look at Jim Rieuwert's 1987 book on soughs proved what I thought but wasn't sure, namely that the timbered sough Nellie Kirkham saw part of in the 1950s was Silence sough near Grindlow.
EDIT - the Greenhow hill example wasn't on a sough as such, but it was a timbered level on Wright's vein, with birch brush and peat over the roof to stop bits falling in. It was reported in NCMRS memoirs for 1966, and a section is apparently preserved, I'm guessing in the museum at Earby.
Follow the horses, Johnny my laddie, follow the horses canny lad-oh!