That is Tyng's Grave high on Miller Hill in American Fork Canyon. ExpeditionUtah has a formal trail adoption on the Miller Hill 4x4 Trail (and south side singletrack) and we've rebuilt the grave site and done a variety of other signage, painting and trail cleanup projects on the route over the years. Saturday we had ~30 people re-staining the lower Kiosk at the Pacific Mine, trash pickup, doing tree cleanup along the road and re-painting the fence at the top.
There were some large mines operating on the mountain back in the late 1800's and into the 1900's, mine owner George Tyng died in an avalanche in 1906. This is what the buildings looked like in his time, and what they looked like as of Saturday.
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Bunch more before/after pics of AFC here: