Almaden Quicksilver

By the 1860s, the mining activity in New Almaden had spawned a self-contained city — with its own government, schools, churches, hospitals, and stores — all organized around the extraction of mercury from the hills of what is now Almaden Quicksilver County Park.
Here is a large detailed map of the many works to which I have added the current trails.

Quicksilver Mining Company: In 1864, after years of bitter legal battles over the original Castillero land claim that had reached all the way to the U.S. Supreme Court[1] the Quicksilver Mining Company of New York purchased New Almaden for $1.75 million. Under new management, operations were modernized and significantly expanded. A tramway was constructed to haul ore from the shafts down to the furnace yard. Machinery was upgraded, processing methods improved, and the communities were brought under firm company control. Between 1864 and 1870, New Almaden supplied the entire domestic demand for quicksilver in the United States, and also exported to China, Mexico, and South America.

Into the Mountain: The scale of tunneling at New Almaden was staggering. Beginning with the original Main Tunnel — a passage ten feet high driven directly into Mine Hill in 1850 — successive managers sent crews deeper and deeper into the rock. By the peak years, workers had bored over 100 miles of tunnels and shafts into the Cinnabar Hills. The deepest point reached 2,300 feet below the summit of Mine Hill, and one shaft was eventually driven to 2,450 feet — the deepest quicksilver shaft in the world. Miners labored ten-hour shifts by candlelight, often more than a thousand feet underground. The Randol Shaft, sunk in 1870, became the workhorse of the operation: in the two decades after its completion, crews were pulling 300 tons of ore per day from its depths. By 1896 the mine was producing $10 million worth of quicksilver annually.

The Furnace Yards: Every ton of ore raised from the shafts had to be processed at the surface. The ore — brilliant red cinnabar, a compound of mercury and sulfur — was loaded into wagons or carried by tramway down to the furnace yards at the base of the hills. There, thirteen large brick furnaces roasted the cinnabar at high heat, driving off mercury as vapor. The vapor traveled through long brick condensing chambers, cooling and collecting as liquid metal that ran into iron flasks — each flask holding 76 pounds of quicksilver. The filled flasks were then loaded onto carts for the trip up Almaden Road to San Jose, and from there by boat and rail to the Sierra Nevada mining camps. The furnace yards, with their constant roar of fire and clouds of acrid vapor, were the industrial heart of the entire operation, running day and night during the peak years of production.

Three Towns on the Hill: The workforce that kept this machinery running lived in three distinct communities, each occupying a different piece of the landscape. The Hacienda, the most refined of the three, stretched along Alamitos Creek at the base of Mine Hill. It centered on the Casa Grande — a three-story, 27-room mansion completed in 1854 and used as the mine manager's official residence and office, its grounds designed by John McLaren, the same landscape architect who later shaped Golden Gate Park. Around it, the company built neat rows of cottages rented to supervisors and furnace workers. A school, a hotel, and a Wells Fargo office all operated within the Hacienda.

Higher up on the ridgelines sat the two miners' settlements. Spanishtown, the largest of the communities, housed the predominantly Mexican and Chilean workforce — miners imported largely from Sonora — in a tight cluster of dwellings in Deep Gulch ravine. Englishtown, also known as English Camp, developed in the 1860s as Cornish miners arrived from Cornwall, England, bringing with them deep-rock expertise honed in the tin mines of Britain. Each town had its own mine office, company store, church, school, and doctor's office. At the operation's peak, more than 3,000 people called New Almaden home, making it one of the largest communities in Santa Clara County.

The Randol Era: In 1870, with ore yields declining and the camps growing increasingly lawless, the Quicksilver Mining Company brought in James Butterworth Randol as General Manager. Randol's twenty-two-year tenure would define the character of New Almaden as much as any pick or furnace. A strict Methodist and natural administrator, he expelled gamblers, drifters, and those without legitimate employment, erected a toll gate at the mine entrance to keep them out, and posted edicts in both English and Spanish throughout the property. He also introduced early company-sponsored healthcare, organized social and cultural life for residents, and invested in the infrastructure of both the mine and the communities. Under his authority, New Almaden became something rare: an orderly, almost paternalistic company town described by contemporaries as resembling a "beneficent feudal society." The National Park Service later called it a mining town unlike any other in the state.

Decline and Closure: After Randol's retirement in 1892, the mine entered its long twilight. The ore bodies that had been so fabulously rich in the early years were thinning. Yield dropped off by more than half by the turn of the century. Worse, a technological shift was underway: the cyanide process, developed in the 1880s, offered a cheaper and more practical way to separate gold and silver from ore, making mercury increasingly redundant for the very industry it had served. Families began to leave the hilltop settlements in large numbers. By 1909 the camps of Spanishtown and Englishtown were largely ghost towns. In 1912, the Quicksilver Mining Company declared bankruptcy and closed the mine. The hills fell silent. In the 1930s, Depression-era Civilian Conservation Corps crews removed most of the abandoned structures from the ridge communities. What had been a city of 3,000 vanished into the chaparral, leaving behind only foundations, tailings, and the tunnels themselves — 100 miles of them, still threading through the rock beneath the trails hikers walk today.