If you look at Google Earth, or should be able to see it on the topo, there are only two big canyons in middle of that long ridge, the one to the south is OL, the one slightly to the north of OL is Spooner. The bottms of both canyons are close to each other, and yes the road to the mine takes you to the bottom of Spooner.
The track east of Sunbonnet is a trail called Hell's Gate. We run those two trails together as one trail, up Hell's Gate to the top of the saddle, then down Devil's Slide to the bottom of Sunbonnet.
Highway 20 is actually called Highway 19, 20, 21.
Nice that you put the KOH tracks on there, but it would be hard to follow unless you had the track in your GPS.
Oh, and Chocolate Thunder is the next larger canyon to the north of Tackhammer, in the same ridgeline.