Today on large scale O.S maps Steep Low is marked as 'Tumulus - Site Of'...
However John Barnatt disagreed with this in his Barrow Corpus and noted the mound as a "natural rocky knoll".
Happens alot in the Peak District....Confusion starts with the word 'Low', which usually means high anyway, and can refer to either a conical/rounded hill or a burial mound. It's pronounced 'la' (from Olde English 'hlaw' for hill?), by old school Derbyshire folk.