Mistake Mine, Arizona — small locality famed for manganese-oxide ramsdellite crystals, their metallic luster, and associations with pyrolusite and romanèchite.
Key facts
Mistake Mine is one of those small Arizona localities whose reputation is far larger than its workings. Set in the Box Canyon Mining District of Yavapai County, north of Wickenburg near Sam Powell Peak, the mine began as a modest silver-gold lode prospect in Precambrian schist and granite cut by quartzite and rhyolite fissure veins. Its economic promise was never the reason collectors learned the name. Mistake entered mineralogical literature because its manganese-oxide seams produced unusually handsome ramsdellite: hard, black to steel-black, metallic crystals in sharp equant, tabular, and short-prismatic habits, commonly massed as glittering plates and knolls on dark manganese-rich matrix.
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For a species that is often visually uncooperative—black, opaque, and commonly massive—the best Mistake Mine specimens are surprisingly sculptural. The finest pieces show individual ramsdellite crystals standing proud from smaller crystals, with flashing metallic faces, subtle silvery highlights, and occasional iridescence or chatoyant gleam as the specimen is turned. Associated and intergrown manganese oxides, especially pyrolusite and romanèchite, are important to the locality’s mineralogical story, and pyrite is documented both in association with and replacing ramsdellite.
Photo: Rob Lavinsky / iRocks.com via Wikimedia Commons
Search for specimens: View all specimens from Mistake Mine, USA
Mistake Mine lies in the Box Canyon area of Yavapai County, Arizona, near the Hassayampa River drainage and the Sam Powell Peak quadrangle, roughly north of Wickenburg. The mapped mine position is at about 34.04725° N, 112.72323° W, with an elevation near 2,500 feet. Older locality labels may read simply “Mistake Mine, Wickenburg,” while more precise modern labels usually give “Mistake Mine, Sam Powell Peak, Box Canyon District” or “Box Canyon Mining District, Yavapai County, Arizona.”
The original lode prospect is described as a small, 21-acre claim. Its host-rock setting is Precambrian schist and granite, with silver and minor gold reported in quartzite and rhyolite fissure veins. The old description of the property notes three parallel ledges rising more than 15 feet above the surface. Silver mineralization was recorded chiefly as cerargyrite, with smaller amounts of embolite and bromyrite; argentite and gold were noted in trace amounts. Copper, antimony, and zinc are reported from sulfide ore at lower levels, but the collector material for which Mistake is known comes from the manganese-rich oxidized environment rather than from showy precious-metal ore.
Development was minor: a 69-foot shaft and a 197-foot incline are the principal workings cited in published summaries. No large, long-lived operating company dominates the mine’s history in the way that United Verde, Ray, Morenci, or Bisbee operators do in Arizona collecting lore. Mistake was a small lode prospect whose fame grew later, through mineral collectors and mineralogical study, after the ramsdellite was recognized as exceptional.
The specimen-producing zone is best understood as a manganese-oxide occurrence within the old workings and associated dump material. Ramsdellite occurs with other MnO2 phases, and later analytical work on a Mistake Mine sample documented ramsdellite with pyrolusite and a smaller amount of groutellite. This is exactly the sort of assemblage that can confuse field identification: black manganese oxides may look deceptively similar, and attractive luster alone is not proof of ramsdellite. The mine’s best specimens earned their reputation because they carry discrete, lustrous, well-shaped ramsdellite crystals rather than merely massive black oxide.
Collecting access should be approached conservatively. The mine is a defunct working near the heavily used Box Canyon recreation corridor, but the legal status of the ground, road access, and mineral entry can change and should not be assumed from old labels or historic collecting reports. A 2014 Bureau of Land Management decision involving an attempted MISTAKE MINE lode claim, AMC424559, declared that claim null and void ab initio because the land was not open to mining under the cited Hassayampa Project withdrawal. Collectors should verify current BLM land status, closures, claim status, and local access rules before any visit, and should treat old shafts, inclines, and rubble piles as hazardous.
Specimen history is more vivid than mining history. The locality is reported to have produced early material, then to have been lost to collectors for a time before Dick Jones and Roy Jones rediscovered it in the 1960s. About six flats of material are reported from that rediscovery period. Later, a small but notable batch appeared around the 2009 Tucson show, followed by additional field-collected material around 2010. These later pieces refreshed the market but did not make Mistake common; the locality remains best represented by old collection specimens and scattered dealer or auction offerings.
Mistake Mine ramsdellite is the locality’s signature mineral and one of the more attractive American occurrences of the species. The best specimens are black to steel-black, lustrous to splendent, and occur as equant, tabular, or short-prismatic crystals on dark manganese-rich matrix; individual crystals are commonly around 3–6 mm, with locality records noting crystals to about 1 cm. Good pieces show crisp, reflective faces and three-dimensional relief rather than a flat black crust, and the finest examples have isolated larger crystals perched on smaller crystallized surfaces. Pyrite is a documented associate and may occur as radiating acicular material or as a replacement of ramsdellite; calcite is also documented from the locality, and pyrolusite or other manganese oxides can partly coat or intermingle with the ramsdellite. Collector-grade Mistake specimens are judged by crystal definition, luster, lack of abrasion on the exposed black faces, and whether the piece preserves an intact crystallized plate or knoll rather than broken massive oxide.
Other documented minerals from Mistake Mine include pyrite, romanèchite, pyrolusite, calcite, and a reported groutellite component in a studied manganese-oxide sample. Mistake is not a type locality for ramsdellite—the type locality is the Lake Valley district in Sierra County, New Mexico—and no type-locality mineral is the reason collectors prize Mistake. Its importance rests instead on a narrow, well-characterized manganese-oxide assemblage and on the unusual quality of its crystallized ramsdellite. Pyrite is especially interesting here because it is not merely an incidental sulfide; locality data record radiating acicular pyrite and note that it can replace ramsdellite, an association worth preserving on labels. Calcite is confirmed from the locality, but it is subordinate in collector interest compared with the black manganese oxides.
Mistake Mine ramsdellite is a locality-sensitive mineral: the value is in the combination of species, crystal quality, and Arizona provenance. Labels reading “Mistake Mine, Wickenburg” may be old and perfectly legitimate, but they are less precise than modern labels giving Box Canyon District or Sam Powell Peak, Yavapai County. Because ramsdellite, pyrolusite, romanèchite, cryptomelane-like “manganomelane,” and other black manganese oxides can be nearly indistinguishable by eye, well-labeled older pieces, pieces tied to known collections, and analyzed or literature-backed specimens deserve a premium. A glittering black manganese oxide from Arizona should not be accepted as Mistake Mine ramsdellite without reliable provenance.
I have not seen credible documentation of deliberate fakes or artificial treatments specific to Mistake Mine ramsdellite. The more realistic problem is misidentification: pyrolusite- or romanèchite-rich pieces, mixed manganese oxides, or unattributed black oxide specimens can be promoted as ramsdellite. Another subtle issue is overzealous cleaning. The exposed metallic faces are hard enough for careful handling, but many specimens are built from intergrown crystals on friable manganese-rich matrix; bruised edges, rubbed high points, and granular shedding along broken matrix are common condition concerns. Avoid acids unless the specimen has been tested by someone who understands both the matrix and the associated calcite, and avoid aggressive brushing that can dull the luster or detach small crystals.
Fluorescence is not a selling point for this locality’s ramsdellite; the species is opaque and metallic, and the Mistake Mine appeal is best evaluated under strong oblique white light. Tilt the specimen slowly. Good pieces flash silver-gray from many individual faces, while ordinary pieces read as dull black crusts. The most desirable specimens are small cabinet to cabinet plates with sharp crystals, visible relief, and little damage. Thumbnails and miniatures are collectable when they show crisp, isolated crystals; larger examples are much scarcer.
Market availability is intermittent. Material appears from old Arizona collections, from older dealer stock, and occasionally through auctions. Documented auction and dealer listings in the 2009–2026 period show that the locality still circulates, but not in volume. Attractive small-cabinet pieces with 5–7 mm crystals are much more desirable than size alone would suggest, because ramsdellite rarely forms showy, lustrous crystals and Mistake Mine is one of the classic American localities where it does.
The Mistake Mine story has the odd rhythm of a desert locality that was found, forgotten, and then found again. Early material is reported from the first decades of the twentieth century, but for a time the mine effectively disappeared from the collector map. The setting did not help: a small, defunct mine in a remote corner of Arizona, hidden among the dry washes, jeep tracks, and broken ledges north of Wickenburg, was easy to know by rumor and hard to pin down in the field.
The rediscovery story centers on Dick Jones and Roy Jones, the father-and-son team credited with relocating the locality in the 1960s. Roy later estimated that about six flats of the classic material came out then. That is a tantalizing number: enough to seed American collections with memorable black metallic plates, but not enough to make the locality common. The best surviving pieces from that generation are still recognizable at a glance—dense, three-dimensional mounds of splendent black crystals, often 5 or 6 mm across, with a silvery flash that seems almost too bright for a manganese oxide.
Then came the Tucson surprise. A later batch surfaced around the 2009 Tucson show, catching collectors off guard because Mistake Mine had already settled into the category of old, sporadic, “maybe one will turn up” localities. The new pieces were not simply black crusts; they carried sharp, lustrous ramsdellite crystals on manganese-rich matrix, some with iridescence and excellent jet-black color. For a species that normally struggles to compete visually with colorful Arizona classics, the sudden appearance of fresh Mistake Mine ramsdellite in the middle of Tucson was memorable.
The landscape itself adds a final layer to the story. The old mine sits near the Box Canyon corridor of the Hassayampa River, where modern visitors encounter a very different sort of desert than the one implied by a black oxide specimen in a Perky box. The Hassayampa is famous for vanishing underground over much of its course, yet in the Box Canyon area bedrock can force water to the surface. Hikers describe a route where one can turn west toward the rubble of the defunct Mistake Mine or east into the narrows, where conglomerate walls, sandbars, and shallow water share space with off-road traffic, gold panners, families, horses, and dogs. It is not a pristine museum setting; it is an active desert corridor, and the mine is one remnant in a landscape still being used, crossed, and argued over.
