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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.Total gold ore production from 1888 to 1892 (first three months) was 57,754 tons with a dollar value of 6,063.According to a 1963 California Division of Mines & Geology report, Stonewall Mine was the most productive gold mine in current San Diego County with a total yield of approximately two million dollars over its entire span of operation.The batholith has been dated as Late Cretaceous in age.The Stonewall Mine itself consists of a body of gold-bearing quartz surrounded by quartz diorite and schist.

Gold production at the mine continued to be strong throughout 1886, 18 under Waldo’s direction.

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 mine shaft, identified as Feature 81, reached a depth of 600 feet in 1892.

Stonewall Mine under Waterman’s ownership ended production by mid-1892.