Thanks for another interesting trip!
I've been to Marietta before and to Candelaria earlier this year. I wish I could have seen Candelaria before the later mining operation erased a lot of it.
Another interesting (to me) part of the story is the Candelaria water pipeline, which brought gravity-fed water 27 miles from a canyon in the White Mountains. They used a really interesting spiral-wound riveted iron pipe. I've found remnants of the pipe in four places, two by accident. They buried the pipeline deep but still had big problems with it freezing in the severe winters.
From the intersection of US6 and NV360 in Nevada, if you look Northeast you can (barely) see a faint dirt track climbing the side of a ridge. This is where the pipe climbed out of the valley. There is an old 2-track road across the valley that was driveable a few years ago, and you can hike to the top of the ridge and see sections of the old pipeline laying around. I've also followed most of the path of the line on Google Earth.
Hope it's ok to post this on your thread!