Descent from Hallett Peak
Rappel off the chains to another bolted anchor on climbers left on a large block, ~100 feet. Do a second rappel from bolts to the top of the gully. A 70m was nice for this second rappel, but a 60 means you just have to do a little more easy scrambling down. Regardless, a single 60m rope is sufficient. Follow the gully north, then northwest, spotting the occasional cairn along the way.