Went to look for this cairn and sadly it has gone. Probably last week or maybe on the same day as I visited, except much earlier (I appeared in the afternoon). The people who had made the road were still at the bottom of the hill with their various machinery. Turbines are being put up almost everywhere in this area at the moment and the site was probably trashed by the making of the road to reach the site of the yet to be built turbine.
Sadly the cairn at NO787720 has also been destroyed and replaced by a quarry or the beginnings of a man made loch.
This information has been passed onto the people at Canmore.
Visited 30/3/2017.