After climbing a gap between hills where the old connector road should be, I've ended up above the road to Tough Nut Mine
Yes, that is a pine tree in the desert. I didn't spot any tracks of the old connector road, but I know I'm in the right place, albeit higher up the hill than envisaged.
From here, I'll be heading off to my right, up the eastward stretch of the road that rises to Tough Nut Mine (not visible here).
My orienteering skills definitely need some practice, and practice is what I'm getting today. It's fun!