With Inset of Julian Mining District
A very scarce topographical map and mines register of San Diego and Imperial Counties. Issued under the aegis of the California State Mining Bureau, headed by State Mineralogist Lewis E. Aubury.
Most of the mines are in the Julian mining district and in the bend in the Colorado River north of Yuma, Arizona.
The boundary with Imperial County has been added in neat manuscript. Imperial County was formed in 1907 from the eastern portion of San Diego County and is one of the last counties to be established in the state.
Irving A. Hubon, styled here as "field assistant," was an important surveyor in San Diego and served as Deputy County Surveyor for a time. He is perhaps best remembered for his Official Map of San Diego County California Compiled from Official Records and Private Sources (1898).
The text booklet comprises the register of known mines in San Diego County, including location, patent status, number and size of veins and character of the ore extracted.
San Diego County Mines
The mines and mineral resources of San Diego and Imperial Counties reflect a rich history, particularly highlighted by the Julian area’s gold rush in the late 19th century, which spurred significant economic development in San Diego County. Julian became known for its productive gold mines, which attracted settlers and miners in the 1870s and led to the establishment of a small mining town. Beyond gold, San Diego County is known for deposits of gemstones, such as tourmaline, while Imperial County features valuable resources, including gypsum and geothermal energy fields, leveraging its desert geology and proximity to the Salton Sea. These mineral resources have contributed to the region’s economic and industrial activities over the years.
Rarity
Very scarce in commerce. 13 institutional holdings per OCLC (the only one in San Diego County at Escondido Public Library). Not in Adams, Books and Authors of San Diego.