Today while getting this cache Mine Cache We ran into a gentleman, who when hearing about Geocaching asked if there was a similar game about finding survey markers. He is doing history work on the mines in and above Big Cottonwood Canyon in Utah, and has found many of these markers, but would like help in finding more. I explained what little I know about benchmark hunting, and told him that I would email him any coordinants I could find of nearby benchmarks. I looked for nearby Benchmarks on Geocaching.com, and found a couple nearby, but not nearly as many as he said there should be or as close to that cache as he said they should be. Do all survey markers show up on Geochaching.com, or only those that people have looked for, and is there anyone that knows how I could find the claims markers if they are not "benchmarks?"