This view shows the isolated out-of-place grave of Peter Miller southeast of Cecilville, California.  According to the headstone, he died on March 12, 1883 at 55 years old.  The area was burned by the 2021 River Complex, a series of 20 lightning-caused fires that burned 199,343 acres.  While this area is relatively remote today w/ a few isolated ranches, the area a few miles downstream housed the mining town of Petersburg.  Sources are limited but may be related to this grave.

From an online source:

Petersburg, settled in the 1850s and 1860s, was, for a time, the largest settlement along the 16-mile stretch of the South Fork of Salmon River between Abrams at Big Flat and Cecilville. Built on a sunny gravel bar, it boasted a hotel, stores, saloons, a meat shop, blacksmith, sawmill, corrals, many residences, even orchards and gardens irrigated by water from nearby gulches and ditches. J. P. Jordan, with ranches at Rush Creek and Garden Gulch, supplied the town with fresh beef. Others who ran businesses or pack trains through here included Arnold Nordheimer, W. P. Bennett and his partner Peter Miller, Kist and Davis, George H. Sightman, George Green Brown, George Wohlfert, Francis Abrams, and Thomas McGinnis Brown who worked as sheriff of Klamath County for fourteen years.

A substantial Chinese community grew up at the lower end of Petersburg, the only section of the community to survive after being mined away by the Salmon River Hydraulic Mining Company at the turn of the century.

Another website indicated a Peter Miller as postmaster of the nearby town of Forks of Salmon on February 7, 1877.

Source: https://jeffersonbackroads.com/2012/01/840/

http://historyandhappenings.squarespace.com/siskiyou-county/2016/2/29/forks-of-salmon.html