The Stonewall Mine itself consists of a body of gold-bearing quartz surrounded by quartz diorite and schist.
Archaeologists from the Southern Service Center (SSC) of California State Parks conducted test-level archaeological excavations at potential locations of new park visitor facilities in April-June 2006 and October-November 2007 to identify the presence or absence of significant cultural remains.
The latter fieldwork represents the first subsurface archaeological explorations ever conducted at the Stonewall Mine site.
The geomorphic province in which Cuyamaca Rancho SP lies is composed primarily of granitic rock of the Southern California Batholith.
The batholith has been dated as Late Cretaceous in age.
Recent Archaeological Investigations at the Stonewall Mine Site Cuyamaca Rancho State Park, San Diego Countyby Michael Sampson, Associate State Archaeologist (Retired)Contributions by Rachel Ruston and Don C.
Perez, Archaeological Specialists Southern Service Center, California State Parks Introduction The remains of the nineteenth century Stonewall Mine and its former workers’ community are located at the northern end of Cuyamaca Rancho State Park (SP), San Diego County, next to Cuyamaca Lake (Figure 1, below).Together, they are designated archaeological site CA-SDI-18502.The site is open to the public daily and has a parking lot, restroom, and picnic tables.This work, which involved no archaeological excavation work, was reported in a thoroughly researched 1986 report.A total of 221 separate cultural features, divided into ten principal categories, were recorded and measured during the 1982 fieldwork.[Note: the term “feature” used here refers to physical evidence of historic-period buildings, structures, trails, artifact concentrations, and similar cultural remains.] The categories consisted of flats (primarily, building remains), prospect holes or mining depressions, trenches, mounds or mine tailings, roads, trails, artifacts, trash deposits, and “large areas” (features of expansive areal extent).