La Minilla mine, Extremadura — a notable collector locality yielding vivid blue plumbogummite botryoidal crusts on pale matrix, with rare supergene phosphates.
Key facts
La Minilla mine is a small but suddenly important collector locality in the old lead-silver country of northeastern Badajoz, Extremadura. The collecting name is often rendered on labels as La Minilla mine, but the better Spanish locality wording for recent specimens is Grupo Minero Juan Antonio, Paraje Las Minillas, Garlitos, in the Comarca La Siberia. Geologically it belongs to the Variscan basement of the area around the Garlitos granodiorite, where Pb-Ag-Zn-Cu vein mineralization occupies fractures and small hydrothermal lodes cutting metamorphic rocks and granitoids. Historically, the district is part of the long Iberian story of argentiferous galena: Roman workings, later modern lead-silver mining, and small 20th-century operations left shafts, trenches, spoil heaps, and a supergene oxidation zone capable of producing secondary lead phosphates.
For collectors, La Minilla’s modern fame rests almost entirely on a recent suite of plumbogummite: botryoidal crusts and rounded aggregates in vivid sky blue, electric blue, bluish green, and gray-green tones, commonly on pale altered matrix and associated with small pyromorphite, kintoreite, hinsdalite, and kaolinite. The best examples are not large sculptural crystals in the Chinese pseudomorph style; they are Spanish supergene phosphate specimens with unusually saturated color, clean botryoidal surfaces, and strong locality significance. For the Iberian Peninsula, this was a genuinely consequential find: it elevated an otherwise obscure Extremaduran lead-silver mine into a locality serious phosphate collectors now recognize immediately.
Regional View
Country View
The visual identity of the locality is narrow but distinctive: thin to substantial plates and crusts of blue plumbogummite spreading over matrix rather than isolated crystals, sometimes with green patches or grayish zones that mark subtle compositional or textural variation across the supergene phosphate layer. Older Garlitos material is better known for pyromorphite, cerussite, galena, quartz, and related oxidation-zone minerals, but the 2024–2025 plumbogummite material gave the mine a new rank among Spanish mineral localities.
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La Minilla lies in the Garlitos area of Badajoz, a district of small hydrothermal lead-silver and base-metal veins associated with the Variscan basement and the nearby Garlitos granodiorite. The broader Siruela-Garlitos sheet records numerous small indications in this part of northeastern Badajoz, including La Minilla, the Arroyo de la Ribera de Garlitos mine, Santa Isabel, La Víbora, Bajohondillo, Cucharrada, and El Borracho. The deposits are epigenetic and structurally controlled: fractures of varying orientation host the mineralization, while lithologic controls include the granitic stocks and related dikes of Garlitos and El Borracho. In the pre-Ordovician schist-graywacke series, the mineralization is generally vein type, dominated by lead, with Zn, Cu, Fe, and Ag as important companions; gangue minerals include quartz, barite, calcite, dolomite or ankeritic carbonates, and altered ferruginous material.
The ore assemblage around Garlitos is the familiar but locally varied Iberian Pb-Ag suite. Primary mineralization includes galena as the main lead ore, with sphalerite, pyrite, chalcopyrite, and locally arsenopyrite, marcasite, gray copper minerals, and ferrodolomite or ankerite. The economic interest was argentiferous galena, while copper appears as a minor but recurring component in several veins. Weathering of these sulfides and the surrounding vein gangue produced cerussite, pyromorphite, covellite, goethite, and, in the important recent find, a phosphate assemblage including plumbogummite, kintoreite, hinsdalite, pyromorphite, and kaolinite.
Mining history here is older than the modern specimen market by many centuries. The municipality of Garlitos lists La Minilla among its Roman mining remains, and archaeological literature for the region repeatedly treats the Garlitos lead-silver mines as part of a Roman mining landscape. Local field accounts mention Roman ceramic fragments on dumps and the reported discovery of old timbers during 20th-century underground work, plausibly from ancient support structures. The mine’s industrial remnants include a shaft and engine-house remains associated with lead and silver working. The surrounding Garlitos field was not a single large modern mine but a cluster of small lodes and workings, exploited intermittently where ore shoots justified the labor.
Collectors should be careful with the locality name. The specimen trade has used “La Minilla mine, Garlitos,” while Spanish collector and dealer sources also use “Grupo Minero Juan Antonio, Paraje Las Minillas, Garlitos.” Nearby and similarly named La Minita or Las Minillas localities in Granja de Torrehermosa appear in the literature and on some labels, so a precise label should distinguish Garlitos from Granja de Torrehermosa. For the blue plumbogummite specimens in the recent market, the most specific recurring wording is Juan Antonio mining group, Las Minillas area, Garlitos, Badajoz, Extremadura, Spain.
Collecting access should not be assumed. The old workings include shafts, trenches, dumps, and unstable remains in rural property, and at least one published description of the Las Minillas area mentions a property fence before the principal mine workings. Any field visit requires permission from landowners and mineral-right holders, and old shafts and underground openings should be treated as dangerous. Most serious collectors will encounter the locality through specimens already recovered and dispersed through Spanish and international dealers rather than through field collecting.
The documented specimen-producing episode began between January 30 and February 15, 2024, when blue to green plumbogummite specimens from the Las Minillas area at Garlitos appeared as a new find. Material was shown publicly in Spanish mineral-show circles in 2024 and 2025, including at MineralExpo Barcelona-Sants, and better examples were subsequently noted as Munich 2024 novelties and in specialist mineral magazines. Additional material from early 2025 reached the market, including larger cabinet plates with electric-blue botryoidal coatings.
La Minilla plumbogummite occurs as botryoidal to mammillary coatings and crusts on matrix, forming continuous rounded layers rather than sharp isolated crystals. The color is the locality’s great attraction: intense sky blue, electric blue, and blue-green to gray-green tones, with the finest pieces showing even, saturated blue across a clean surface. Known specimen sizes range from small plates around 4–6 cm to cabinet-size pieces exceeding 13 cm across, with several dealer records noting pieces of 8.0 x 6.0 cm, 9.5 x 7.5 cm, 13.0 x 9.5 cm, and 13.5 x 10.5 cm. The characteristic association is kaolinite, pyromorphite, kintoreite, and hinsdalite, with the phosphate suite developed in the oxidized zone of the old lead mineralization. Good examples separate themselves from ordinary ones by color density, unbroken botryoidal skin, attractive contrast with the matrix, and visible companion phosphates; damaged crusts, dull gray-green surfaces, and thin discontinuous coatings are much less desirable. Some dealer descriptions also report shortwave ultraviolet fluorescence, which is unusual enough to be worth noting on labels and in collection records.
Other documented minerals from the La Minilla–Las Minillas Garlitos area include pyromorphite, cerussite, galena, quartz, kaolinite, kintoreite, hinsdalite, and the broader Garlitos suite of pyrite, chalcopyrite, sphalerite, barite, fluorite, anglesite, hemimorphite, descloizite, vanadinite, pyrolusite, and chalcedony cited for the local Pb(Cu) mines. No type-locality species define La Minilla’s reputation; its importance is instead as a modern Iberian locality for high-quality plumbogummite and as a locality where multiple secondary lead phosphates developed together in a compact supergene system. Older pyromorphite from Las Minillas is also collectible, with documented specimens reaching 13 x 10 x 9 cm and individual crystals in the 3–5 mm range.
The principal authenticity issue is not widespread fakery but locality precision. “La Minilla,” “Las Minillas,” “La Minita,” “Grupo Minero Juan Antonio,” “Garlitos,” and “Granja de Torrehermosa” are all names that appear in the broader Badajoz mining record, and they do not always refer to the same occurrence. For the recent blue plumbogummite, a strong label should read along the lines of “Grupo Minero Juan Antonio, Paraje Las Minillas, Garlitos, Comarca La Siberia, Badajoz, Extremadura, Spain,” even if the market shorthand is “La Minilla mine.” Be wary of vague labels that say only “Las Minillas, Badajoz” without municipality, especially where the specimen is being compared with the nearby Granja de Torrehermosa material.
Condition is the next point. Botryoidal plumbogummite crusts can bruise, abrade, or flake at high points and edges; small rubs on blue surfaces are conspicuous under magnification because the color and luster are carried by the surface skin. Matrix pieces may be thin plates, so check the back for sawed, stabilized, or naturally weak areas. Earthy kaolinite and altered vein material can shed powder, and old dump pieces may have friable iron-oxide zones. Avoid washing aggressively; a light air bulb, soft brush, and stable dry storage are safer than soaking.
There are no well-documented treatments or artificial color enhancements specific to La Minilla plumbogummite in the reliable collector record. Still, the unusual blue color means analytical confirmation is valuable on expensive pieces, especially because the associated phosphate species are visually subtle. Kintoreite and hinsdalite should not be accepted on appearance alone unless the label traces to analyzed material or a trustworthy source. Pyromorphite associations are easier to recognize, but very small crystals can be confused with other pale secondary coatings.
The market is active but finite. The locality moved from obscurity to visibility with the 2024 find, and the best pieces were quickly absorbed into advanced collections, Spanish reference collections, and dealer inventories. Small to miniature specimens are obtainable when collections disperse or dealer back stock appears; clean, saturated cabinet plates are much scarcer. The largest and bluest examples deserve locality premiums because they represent a short-lived find from a small old lead-silver mining area rather than a large ongoing industrial source.
The modern La Minilla story has the satisfying rhythm of a locality that was hiding in plain sight. Garlitos was never mineralogically blank: collectors knew its pyromorphite, cerussite, galena, and old lead-silver workings, and the municipality itself treated La Minilla as part of its Roman archaeological inheritance. Yet the mine was not a name that would make phosphate collectors stop in the aisle—until the blue plumbogummite began to appear.
The key collecting window was sharply bounded: January 30 to February 15, 2024. Within that fortnight, specimens from the Las Minillas area at Garlitos emerged with rounded crusts of plumbogummite in blue, green, and gray-green shades, accompanied by pyromorphite, kintoreite, hinsdalite, and kaolinite. By the time pieces reached MineralExpo Barcelona-Sants and the wider European show circuit, the find had become one of those whispered “new Spanish locality” moments collectors remember: not because the pieces were huge, but because the color and assemblage were far better than anyone expected from an old Extremaduran lead mine.
A field note from the Garlitos area gives the old mine landscape a more tactile frame. Walking among the dehesas, a collector described the route toward nearby workings past holm oaks and ash trees, with the Garlitos stream sometimes difficult to cross when water was high. The quartzites of the Sierra de Minerva dominate the scene. Across the way lay La Minilla, close to the village, its dumps carrying reminders that the mine was ancient as well as mineralogical. Ceramic fragments were reportedly easy to find on the waste heaps, and a local man told the visitor that during 20th-century exploitation, workers found wooden pieces inside the underground workings—timbers that may have belonged to Roman supports.
That combination is what gives the locality its charm: blue secondary phosphates born from oxidized lead ore, resting on a mining palimpsest of Roman exploitation, lead-silver industry, and rural Extremaduran ruins. The plumbogummite is the market headline, but the setting is older and more layered than the 2024 find alone.
IGME, MAGNA Sheet 781, Siruela: geological and economic-mineral resource memoir — Official geological mapping source for the Garlitos area, listing La Minilla among the recognized mining indications and describing the Pb-Ag-Zn-Cu-Fe vein systems, structural controls, and host rocks.
Palero, F.; Gumiel, P.; Fernández Carrasco, J. “Ensayo de tipología de las mineralizaciones BPGC de la Alta Extremadura,” Boletín Geológico y Minero 96(4), 1985 — Regional metallogenic classification that places La Minilla, Garlitos among the late fracture-filling quartz-carbonate Pb-(Cu-Zn) veins of Upper Extremadura.
Mapa Metalogenético de la provincia de Badajoz, escala 1:200000 — A useful synthesis of the Garlitos vein field, its intermittent exploitation from ancient times to the late 20th century, and the mineralogy of the lead-silver indications around the Garlitos granodiorite.
Fabre Minerals reference records for plumbogummite from the Juan Antonio mining group, Las Minillas area, Garlitos — Dealer-reference documentation of the 2024 and 2025 plumbogummite specimens, including sizes, color descriptions, associated pyromorphite-kintoreite-hinsdalite-kaolinite, and publication notes.
Fabre Minerals plumbogummite search records — English-language records noting the find as a 2024 novelty and describing the geology of the Las Minillas area as Variscan basement with Pb mineralization linked to fractures and small hydrothermal veins.
FMF MineralExpo Barcelona-Sants 2025 thread — Spanish collector-show record identifying the Garlitos plumbogummites as found between January 30 and February 15, 2024, and noting the associated analyzed species.
FMF “Minerales de Extremadura” thread, pyromorphite from Las Minillas, Garlitos — Collector record of earlier Las Minillas pyromorphite specimens, including piece sizes and crystal-size notes.
Lapis, issue 11–12/2024, p. 71 — Cited in dealer-reference records as publishing the Munich 2024 novelty plumbogummite from Las Minillas/Garlitos.
“Plumbogummite - Minerals For Sale - #1482032,” Weinrich Minerals — Dealer specimen page with a watch-specimen-video feature for an 8.0 x 6.0 x 2.0 cm small-cabinet plumbogummite from La Minilla mine, Garlitos.
“Plumbogummite - Minerals For Sale - #1482016,” Weinrich Minerals — Dealer specimen page with video access for a 6.0 x 3.0 x 0.8 cm small-cabinet example from the 2024 La Minilla plumbogummite suite.
Ayuntamiento de Garlitos heritage page — Municipal heritage source listing the Roman mining exploitation “La Minilla” among Garlitos archaeological remains.
Tourism La Siberia: Garlitos — Local tourism context for Garlitos, including references to Roman finds in the La Minilla area.
Nosolopiedras: “Algunas minas viejas de Garlitos (Badajoz)” — Field-style account of old Garlitos mines, landscape, mine remains, galena-bearing veins, cerussite, Roman ceramics, and La Minilla shaft and engine-house remains.
Minfind archive: Plumbogummite from La Minilla mine, Garlitos, Badajoz — Archived dealer listing documenting size, 2024 collection date, shortwave UV fluorescence, and associated kaolinite, pyromorphite, hinsdalite, and kintoreite.
Weinrich Minerals: Plumbogummite #1482032 — Primary dealer record for a representative small-cabinet La Minilla plumbogummite with association and fluorescence notes.
Mindat: Plumbogummite mineral data and locality list — Species-level reference that includes the Garlitos and Las Minillas occurrences in Extremadura.
Rocks & Minerals, vol. 100, no. 3, 2025, p. 268 — Cited in dealer-reference records as publishing one of the notable 2024 plumbogummite specimens.
Paragénesis, issue 01/2025, pp. 107 and 111 — Cited in dealer-reference records for published photographs and novelty notes on the Garlitos plumbogummite material.
