Spelunking in Old Mines: History, Danger, and the Treasures Hidden Underground

Spelunking in Old Mines: History, Danger, and the Treasures Hidden Underground

Explore the dangers, history, and potential treasures hidden deep within abandoned mining operations

This article is for historical and educational purposes. Seeadler’s Treasure Guide does not encourage unsupervised entry into abandoned mine workings.

Before anything else is said about the history, the geology, the artifacts, or the undeniable pull of a dark tunnel disappearing into a hillside, this needs to be stated clearly and without qualification: abandoned mines are among the most dangerous environments a person can voluntarily enter, and people die in them every year. Not occasionally. Not rarely. Every year, in mines across the country, people who went in out of curiosity or adventure do not come back out. They fall into shafts hidden under rotted timber covers. They are overcome by invisible gases that provide no warning before unconsciousness. They are buried when walls or ceilings that looked solid for a century choose that particular moment to let go.

The Mine Safety and Health Administration has documented these fatalities in detail, and the pattern is consistent and grim. Most victims are not careless people. They are curious people who underestimated a specific hazard or trusted a piece of aging infrastructure that failed them at the worst possible moment. The darkness underground is absolute. The silence is complete. The distance from help is total. None of what follows is intended to encourage anyone to enter an abandoned mine without proper training, proper equipment, and proper companions. Some of the most rewarding exploration of mining history happens entirely above ground, and that approach is safer, often equally informative, and produces historical understanding that is genuinely valuable without risking anyone’s life to obtain it.

With that understood, completely and without reservation, let us talk about mines.

Why Abandoned Mines Exist and What They Contain

The United States contains an estimated 500,000 abandoned mine sites distributed across the landscape with a density that reflects the intensity of a century of American mineral extraction. They are everywhere: in national forests, on Bureau of Land Management land, on private property, in state parks, and in the middle of developed communities where the mining history has been partially erased by subsequent development.

Most mines were abandoned not because they were exhausted but because they became uneconomic. Price collapses, richer discoveries elsewhere, financing failures, or legal disputes made continued operation impractical, and the abandonments were often sudden. That suddenness is what gives mine sites their archaeological character. A mine that was operating one week and silent the next leaves behind a snapshot of a moment in time: the blacksmith shop with tools still on the bench, the assay office with records still on the desk, the bunkhouse with personal effects still in the lockers, the ore processing equipment frozen in mid-operation. These time capsule qualities are what give abandoned mine sites their extraordinary historical interest and what makes the surface archaeology of those sites so rewarding for researchers willing to read them carefully.

Death Valley and the Ashford Mine: A Personal Account

Death Valley National Park is not a place most people associate with productive mining, but that reflects the popular image of the valley rather than its actual geological character. Death Valley and its surrounding ranges contain a remarkable variety of mineral deposits worked by numerous operations over more than a century of intermittent mining activity, and the abandoned mines scattered across its mountain ranges represent some of the most historically interesting and most atmospheric mine sites in the American West.

My own introduction to Death Valley’s mining history came during my time stationed at Nellis Air Force Base outside Las Vegas, when the desert country within a day’s drive of the base became a regular destination for exploration during off-duty time. Nellis put me within striking distance of some of the most extraordinary landscape and most concentrated mining history in the country, and I made use of that proximity as often as I could. Death Valley was a natural destination, close enough for a weekend trip and rich enough in history and landscape to reward repeated visits across different seasons and different areas of the park.

The Ashford Mine sits on the east side of Death Valley in the Black Mountains, the steep range that forms the valley’s eastern wall and separates it from the Amargosa Desert beyond. Getting there requires leaving the main valley road and following desert terrain that is unforgiving in the way Death Valley terrain always is: loose rock, extreme heat for most of the year, no water, no shade, and distances that look manageable on a map and feel considerably less so on foot. From Nellis the drive was substantial, crossing the southern end of the valley and working up into the Black Mountains on roads that tested whatever vehicle you were driving and reminded you at every mile how remote the destination actually was.

The Ashford is a gold property, worked intermittently from the early 20th century through various subsequent efforts that never quite achieved sustained productivity. The remains reflect that pattern of intermittent effort: workings extended and modified across multiple periods of activity, surface structures in various states of collapse and preservation, and the fragmentary material record that accumulates when a property is returned to repeatedly without ever becoming a going concern.

Exploring the surface of the Ashford site is a genuinely rewarding historical exercise. The waste rock dumps tell you something about the geology the miners were working through. The structural remains reflect the construction methods and material choices of the era, and reading those choices against the extreme logistical challenges of supplying a remote Death Valley operation adds a dimension to historical appreciation that a simple inventory of structures cannot capture. Standing there and thinking about what it took to get equipment, supplies, and a workforce to that location in the early decades of the 20th century, across terrain that challenged a well-equipped jeep decades later, gives you genuine respect for the people who built and worked those operations.

Standing at the portal of an Ashford tunnel and looking in is one thing. The darkness is immediate and absolute beyond the reach of daylight, and the smell of old rock and stale air is distinctive and slightly unsettling in a way that is probably an appropriate response to the environment. The temptation to go further in is real. The reasons not to, without proper equipment and training, are considerably more compelling — and coming from Nellis, where the consequences of poor risk assessment were understood in professional terms, that calculus was not a difficult one to work through.

Death Valley’s mining history extends far beyond the Ashford property. The Skidoo gold mine in the Panamint Mountains justified a water pipeline of extraordinary length and ambition, carrying water over miles of brutal terrain to supply the operation. The Harmony Borax Works near Furnace Creek is the most famous site associated with the borax mining that made Death Valley synonymous with twenty-mule-team wagons in the late 19th century. Rhyolite, just outside the park boundary in Nevada and considerably more accessible from Las Vegas than the deep valley sites, is the most spectacular mining ghost town in the region, its ruins of stone and concrete buildings reflecting the ambitions of a boom that lasted less than a decade. Each of these sites rewards the surface explorer who takes the time to read what remains carefully and in context, and the proximity of Nellis to all of them makes the southern Nevada and Death Valley mining landscape a natural laboratory for anyone stationed there with curiosity and a reliable vehicle.

The Surface Archaeology: Reading What’s Above Ground

The most rewarding and safest approach to abandoned mine exploration focuses on the surface archaeology rather than the underground workings, and the surface record is richer than most people appreciate before they begin spending serious time at mine sites.

The waste rock dumps flanking every mine opening are the first and most accessible source of geological and historical information. Their composition reflects the geology through which the workings passed: the greenish malachite and blue azurite of copper minerals, the heavy iron oxide gossan over sulfide ore bodies, the occasional specimen of actual ore mineral deposited before it was recognized as valuable. For the rock hound and mineralogist, mine waste dumps are among the richest collecting environments available, and collection of mineral specimens from mine waste is generally legal on BLM land within the personal use limits that apply to casual collecting on federal property.

The surface structures tell a story of industrial organization that is as interesting as the geology. The headframe over a shaft reflects the hoisting technology of the era and the scale of the operation. The mill reflects the specific metallurgical processes used and the engineering knowledge available at the time. The assay office, blacksmith shop, powder magazine, superintendent’s house, and bunkhouses each reflect a specific function in the operational life of the mine, and reading them as an ensemble gives a sense of the social and organizational character of the operation that no single structure conveys alone. Equipment left at remote sites because the economics of salvage made removal impractical, ore cars, compressors, hoisting engines, stamp mills, represents direct connections to the specific technologies of the specific era when the mine was operating.

If You Go: What Trained, Equipped Teams Do — This Is Not a Beginner Checklist

For those who choose to explore underground workings, the approach that experienced mine explorers have developed is worth following in detail.

The minimum safe party size is three people. Two is insufficient because an incapacitated person cannot be both cared for and gone for help simultaneously, and one is simply inadequate for any realistic rescue scenario. All three members should carry three independent light sources each: primary headlamp, backup headlamp, and chemical light sticks. The darkness in an abandoned mine is absolute and immediate when the primary light fails.

Atmospheric testing is non-negotiable. Carbon monoxide, carbon dioxide, hydrogen sulfide, and methane are all potential hazards, and none provides reliable sensory warning before incapacitation. A four-gas detector of the type used in industrial confined space entry work is the appropriate instrument, and understanding how to interpret its readings before entering any underground space is part of the preparation that cannot be skipped.

Structural assessment requires training that takes time to develop. Timbered mines present particular challenges because wood that has been in a mine environment for decades may look sound while being functionally rotted. Rock mines require the ability to identify loose blocks in the back, assess joint and fracture patterns, and recognize the specific failure modes that rock falls in mine openings follow. Organizations that train mine rescue personnel provide formal frameworks for developing these skills, and the investment in that training returns enormous dividends in the field.

The Legal Framework

Abandoned mine exploration exists in a legal landscape that requires research before any visit. BLM and Forest Service policies range from open access with safety warnings to formal closure orders backed by legal enforcement. Both agencies have formally closed many mine openings that present the most serious hazards, typically with bat-friendly grating that prevents human access while allowing passage of cave-dwelling bat species. Entering a formally closed mine opening on federal land is a violation of federal law.

Death Valley National Park prohibits collection of any natural or cultural resource within park boundaries, extending to mineral specimens, artifacts, and any other material from mine sites. Entering mine workings within the park without specific written authorization from the park superintendent is prohibited. The park maintains information about accessible sites and applicable conditions, and engaging with the park service before exploring mine sites within its boundaries is both legally required and practically intelligent.

Mine sites on private land require landowner permission, and the liability considerations that attach to abandoned mine hazards make many private landowners reluctant to grant access regardless of stated purpose. Approaching landowners honestly, demonstrating knowledge of relevant safety considerations, and offering to sign an appropriate liability release gives the best chance of a productive outcome.

The Archaeological Resources Protection Act makes it a federal offense to excavate or remove archaeological resources from federal land without a permit, and abandoned mine sites that are more than fifty years old and retain historical significance qualify as archaeological resources under this definition. State historic preservation laws add further layers in most states. The material culture of mining sites belongs to the historical record, and the legal framework that protects it reflects a genuine and important public interest in preserving that record for future researchers.

What Mine Exploration Produces

The rewards of responsible mine site exploration are genuine and varied. For the historian, mine sites are primary documents of American industrial and social history that no archive quite replicates. The material culture of mining life tells the story of specific people who worked specific mines in specific periods in ways that add human texture to the statistical and corporate history that most formal accounts provide.

For the treasure hunter in the broadest sense, mine sites offer possibilities ranging from the mundane to the genuinely interesting. Surface artifacts recoverable within the applicable legal framework include tools, hardware, bottles, ceramics, and personal effects. Coins occasionally turn up at sites where pay was distributed. And in rare cases, ore specimens of significant value appear in waste material deposited before modern metallurgical methods made low-grade material worth processing.

The stories of significant hidden caches in mine workings circulate widely in the community of people who spend time at these sites, and they deserve the same critical evaluation applied to any treasure legend. What is real is the material of ordinary mining life, scattered across the landscape of every significant mine site in the country, available to the careful and knowledgeable observer who takes the time to read it correctly.

The Final Word

This blog began with a warning and it ends with one, because the subject demands it. The history that mine sites contain is extraordinary and genuinely worth pursuing. The mineralogy is fascinating. The surface archaeology is rewarding. None of it is worth dying for.

The abandoned mines of the American West have claimed enough lives to make that statement something more than a formulaic safety warning. They are beautiful and atmospheric and historically rich and genuinely dangerous, and holding all of those things in mind simultaneously, without letting the beauty and the richness crowd out the danger, is what responsible mine exploration actually requires.

Those of us who explored sites like the Ashford from the relative comfort and convenience of a Nellis posting had advantages that most visitors to Death Valley do not: proximity that allowed multiple visits rather than a single rushed trip, the physical conditioning that military service demands, and a professional culture that took risk assessment seriously. Even with those advantages, the margin between a productive day of surface exploration and a genuinely bad outcome underground was never more than a set of decisions away.

Go carefully. Go prepared. Go with people who know what they are doing. Stay outside unless you have the training, equipment, and companions that underground exploration requires. Read the surface archaeology with the attention it deserves.

And come home. The history will still be there next time. That is only possible if you are too.