I've done this ride today
The weather was rubbish, it's rained here for four days non stop!
You can easily get through the quarry, they've built a path so you can avoid the trucks etc. The path then leads you to the the track on the far side of the quarry. It's a good track for about 10 miles, a little sandy in patches. The track then turns rocky between Cadderlie and Dail. I was on a fully rigid and it was a bit jarring even with a low psi. The road forks at Barrs lodge, right side takes you to the boathouse which is a dead end
a steep climb back up the hill and the left track takes you to glen Etive. After crossing a ford the track turns into two tyre tracks only, deeply rutted! Another couple of miles and the track is no longer there. I travelled a fair way but it was extremely boggy and very rocky. I was pushing and lifting the bike more than riding it. I got close enough to see the road in Glen Etive at the north of the loch and then turned around to head back.
It rained 99% of the trip, 74.3 miles, 30 on road 15 to the quarry/15 back with the rest off road.
So it can be done but its knackered me trying to find out
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Glen Etive by - David Bithell ( oggl @DJB )-