Old Mines of Southern California: Desert-Mountain-Coastal Areas Including the Calico-Salton Sea Colorado River Districts and Southern Counties

In Short

This volume is a systematic geological survey of the mountain, desert, and coastal mining districts across Southern California in the early 1890s. Field assistant William H. Storms documents the physical reality of the region's mines, traveling from the San Gabriel Cañon down to the Mexican border and east across the Colorado Desert. Through precise descriptions of rock strata, fault lines, and extraction methods, he records an industry in transition. The work endures as an unvarnished, first-hand record of historic mining camps, capturing the ground-level geology and fragile economics of the American West before modern automation.

The Story

The book moves as a structured regional survey, progressing county by county through the varied topographies of Southern California. Beginning in Los Angeles County, the narrative probes deep into the San Gabriel Cañon, examining the crystalline schists and intrusive dikes of the Kelsey Mine, famous for its extraordinarily rich silver deposits. From there, the report turns south through San Diego County, tracing the complex granitic and schistose formations that stretch along the Campo road toward Dulzura, Potrero, and the high Cuyamaca peaks.

As the survey advances, the focus shifts from general regional geology to the specific mechanics of mineral vein formation. Storms maps the slate and gneiss formations surrounding the gold camps of Julian and Banner, noting where ancient magmas intruded into existing strata. Descending the steep mountain passes into the arid San Felipe and Vallecito valleys, the text charts the harsh transition into the true desert, where shattered white granite and ancient Tertiary gravels dominate the landscape.

The narrative then sweeps north and east into the fiercely dry Calico Mountains and the surrounding desert districts. Here, the investigation sharpens around the structural puzzles of the Calico uplift—a core of massive rhyolite blanketed by light-colored breccia, tufa, and rich deposits of calcium borate. Storms details how ancient lake beds were folded and tilted by volcanic forces, creating massive, vein-like borax deposits.

Throughout the desert routes, the text balances pure structural geology with practical assessments of active mining operations. In camps like Vanderbilt, Cargo Muchacho, and the remote Eagle Mountain District, the survey analyzes the commercial viability of individual claims. Storms assesses the depth of shafts, the quality of ore shoots, and the severe logistical hurdles facing miners, such as missing fuel supplies and extreme distances from water. The journey culminates in the dry sink of the Salton Basin. Examining salt marshes, mud volcanoes, and old flood channels of the Colorado River, the report concludes with a look at how subterranean water flows and rapid evaporation shape the extreme environment of the far south.

How It Unfolds

Mapping the coastal ranges The survey opens among the metamorphic rocks and intrusive dikes of the San Gabriel Mountains before moving south to trace the massive granite, diorite, and schist belts of San Diego County. Storms logs the changing country rock from Dulzura to the Cuyamaca peaks, establishing the foundational structural geology of the region.

Descending to the desert edge Passing through Julian and Banner, the text follows the rock formations down rocky gorges toward Vallecito Creek and the open desert. The report notes how hard granites give way to deeply decomposed, shattered rock that resembles Tertiary gravel deposits.

Unraveling the Calico uplift Entering the barren Calico Hills, the narrative investigates complex volcanic formations, heavy faulting, and folded sedimentary strata. Storms details the origin of the massive calcium borate beds, explaining how ancient lake deposits were tilted upright by underground volcanic pressure.

Evaluating active claims The focus shifts to individual mining operations like the Imperial lode, the Tiptop, and the Carbonate Mine. The text outlines the width of ore shoots, the presence of silver, copper, and gold, and the steep capital required to work base ores in waterless districts.

Probing the Salton Basin The report concludes along the Colorado Desert's lowest depressions, analyzing salt crusts, boreholes, and river overflow channels. Storms offers a theoretical explanation for the sudden formation of Salton Lake based on subterranean drainage and rapid evaporation.

The People

Because this is an official field report rather than a narrative work of fiction, its primary figures are the historical prospectors, mine managers, and original claim-finders whose work Storms inspects on the ground.

• Collins: A sharp-eyed lime quarry worker who discovers rich croppings of silver-bearing limonite and manganese. His initial surface work establishes the Carbonate Mine, which transforms a quiet camp into a famous mining district before he transfers the property to a Los Angeles company.
• Mr. Bailey: An active mill operator in the Vanderbilt District who works alongside his brother to overhaul their ten-stamp mill. He installs a twelve-foot Pelton waterwheel to process thousands of tons of gold-bearing quartz from the Ready Relief mine.
• D. C. Lane: An experienced mine manager placed in charge of the promising Cincinnati Belle property near Banner. He oversees operations for a Pomona syndicate that acquired multiple high-grade gold claims in the district.
• The Unnamed Manager at Kentuck S: An overly ambitious field manager backed by a St. Louis syndicate who spends $10,000 sinking an ill-advised vertical shaft high above the ore croppings. His failure to drive a simple crosscut tunnel leaves the shaft abandoned, serving as a cautionary example of improper mine development.

In Its Own Voice

"The mountains often show pale purple to brown tints. On examination they appear to consist of a white granite, which has been so shattered as to break up into pieces, averaging not over 2 inches in diameter."

"With the uplift, the strata inclosing the borax mine were tilted and folded, and now the sheet of white calcium borate which once lay glistening in the sun on the bed of a desert dry lake stands like a great vein traversing the country."

"Here the work was stopped, and has never since been resumed, standing an excellent example of how not to open a mine."

What It's Really About

Beneath its dry descriptions of hornblende gneiss, porphyry dikes, and quartz veins, the book is a study of human ambition attempting to extract wealth from an unforgiving physical environment. It exposes the tension between speculative mining hype and cold geological reality. Storms repeatedly illustrates how financial capital is squandered when operators ignore structural geology, choose poor shaft sites, or misjudge the immense cost of hauling water and fuel across barren wastes. The text argues that successful resource extraction requires precise scientific observation rather than blind luck or reckless investment. At its core, the work poses fundamental questions about how natural forces shape the earth's crust and how human industry adapts to severe environmental constraints.

Why Read It Today

This work will deeply satisfy historians of the American West, field geologists, desert travelers, and readers curious about the unvarnished realities of late-nineteenth-century mining. Reading it feels like walking an active trail alongside a sharp, non-nonsense field inspector who sees directly through local rumors and corporate exaggerations. The prose is sober, clean, and filled with crisp physical observations of remote cañons, dry gulches, and crumbling shaft houses.

The book does present specific period challenges. It makes no effort to entertain with dramatic plotlines or stylized prose, and general readers may find the dense geological vocabulary—heavy with terms like schistose, diorite, liparite, and pegmatite—demanding to navigate without a reference key. Furthermore, the narrative structure is strictly geographical rather than character-driven. Yet what stays with you is the authentic atmosphere of the frontier desert: old Mexican arrastras left crumbling near quartz veins, isolated stamp mills clacking in waterless cañons, and the quiet, persistent work of miners searching for fortune in the sun-bleached hills of Southern California.