Archaeologists excavating a small cave perched at 2,235 meters in the eastern Pyrenees have recovered a child’s baby tooth, a finger bone, and dozens of crushed green mineral fragments sealed in layers roughly 5,500 years old. The find, from a site known as Cave 338 in the Nuria Valley of Queralbs, Girona, represents the earliest documented evidence of sustained prehistoric occupation above 2,000 meters in the mountain range. With approximately 23 hearths packed into dense stratigraphy, the site rewrites assumptions about who was living and working at extreme altitude during the late Neolithic period and why they kept coming back.
Why a child’s presence at 2,235 meters changes the story
High-altitude sites in European mountain ranges have long been treated as temporary hunting stops or seasonal pastures used by small groups of adults. Cave 338 breaks that pattern. The recovery of a young child’s deciduous tooth and finger bone, described in the peer-reviewed study in environmental archaeology, signals that families, not just specialized work parties, made the steep climb into the Nuria Valley. Children do not typically accompany short-range scouting trips. Their presence points toward repeated, planned visits where entire household groups stayed long enough for daily life to leave physical traces.
That reading gains force from the sheer density of the occupation layers. Roughly 23 hearths stacked through the cave’s stratigraphy indicate not a single campfire but many returns over generations, each one producing new combustion pits and ash deposits. The green mineral fragments found throughout those layers appear deliberately crushed rather than naturally deposited, suggesting on-site processing of a copper-bearing stone, likely malachite. Taken together, the child’s remains, the hearths, and the mineral debris outline a seasonal camp where families participated in mineral extraction at an altitude previously considered too harsh for sustained prehistoric activity.
The child’s presence also complicates older models that imagined early copper prospecting as the domain of small, mobile groups of male specialists. Instead, Cave 338 hints at a social organization in which mineral extraction was embedded within broader household routines. The baby tooth and finger bone do not necessarily indicate that children labored directly in mining tasks, but they do show that the risks and hardships of high-altitude work were shared across age groups. For archaeologists, this shifts the focus from purely economic explanations toward questions of community decision-making, mobility traditions, and how knowledge of remote resources was transmitted within families.
Hearths, green stones, and the stratigraphy inside Cave 338
Excavations at Cave 338, conducted between 2021 and 2023, exposed a tightly layered sequence of occupation floors. Each layer contained combustion features and scattered green mineral fragments, building a record of repeated visits rather than a single event. The cave sits in Queralbs, a municipality in Girona province, and opens onto slopes where copper-rich geological formations are known to occur. Co-author Marta Sánchez de la Torre, commenting on the hearth features, stated plainly that the stones “weren’t burned by accident,” according to the Frontiers press summary. The deliberate, repeated burning recorded across the site is consistent with fire-setting techniques used in early mineral processing, where heat was applied to rock to fracture it and expose ore veins.
The green stones themselves are central to the mining interpretation. Their abundance and crushed state distinguish Cave 338 from pastoral shelters or hunting camps at similar elevations. Pastoral sites leave behind animal bone and dung layers; hunting camps produce lithic tool waste. Cave 338 produced green mineral debris in quantities that point toward extraction and initial processing of a copper ore or pigment mineral. The study describes these fragments as consistent with malachite, though full laboratory confirmation of exact composition has not yet been detailed in publicly available data tables.
Press materials also reference lost jewelry fragments found in the cave’s layers, adding another dimension to the site’s use. Personal ornaments suggest the occupants carried valued items with them, reinforcing the picture of planned, equipped stays rather than emergency shelters. The stratigraphic association of these objects, however, has only been described in institutional communications, and their precise dating within the occupation sequence awaits more detailed publication. Supplementary images and graphics released through the press office emphasize the combination of burned stone, mineral debris, and personal items that underpins the interpretation of Cave 338 as a specialized camp.
Inside the cave, the hearths vary in size and construction, but together they form a compact palimpsest of activity. Some combustion features cut into earlier ash layers, indicating that later visitors reused favored spots while reshaping the interior floor. The repeated burning would have produced smoke and heat in a confined space, suggesting that occupation episodes were probably short but intense, focused on processing material brought in from nearby outcrops. The absence of thick animal bone accumulations or extensive domestic refuse supports the idea of targeted work stays rather than long-term residence.
Open questions about Cave 338’s mineral processing and seasonal timing
Several threads remain unresolved. The full suite of radiocarbon dates and any Bayesian modeling used to refine the occupation timeline have not yet been released beyond summary statements placing the activity at approximately 5,500 years ago. A tighter chronology would clarify whether the 23 hearths accumulated over decades or centuries, and whether the camp’s use intensified during the Neolithic–Chalcolithic transition when copper working spread across western Europe.
The green mineral’s exact identity also carries significant interpretive weight. If confirmed as malachite, a copper carbonate, the fragments would tie Cave 338 directly to early copper extraction networks. In that case, the site would represent one of the highest-altitude nodes in a broader system of resource zones feeding lowland communities, where smelting and metalworking likely took place. If the mineral turns out to be a non-metallic green stone used primarily as pigment, the site’s role shifts from mining camp to a different kind of seasonal resource station, perhaps focused on acquiring colorants for body decoration or ceremonial objects. Laboratory results distinguishing between these possibilities have not appeared in the available peer-reviewed text, leaving room for multiple working hypotheses.
The child’s remains raise their own set of questions. A single deciduous tooth and finger bone cannot tell researchers whether the child lived at the site for weeks or died during a brief visit. Isotopic analysis of the tooth enamel could eventually reveal diet, geographic origin, and altitude of early childhood residence, but no such results have been reported yet. Likewise, without a more complete skeletal assemblage, it is impossible to know whether the child suffered any trauma or health stress linked to high-altitude exposure or mining-related hazards.
Seasonality is another key unknown. The cave’s elevation suggests that winter occupation would have been difficult, with heavy snow limiting access and increasing risk. Archaeologists therefore suspect that visits clustered in late spring, summer, or early autumn, when passes were open and water sources accessible. Yet, only a detailed study of faunal remains, plant macrofossils, and microstratigraphy can confirm whether specific seasons are overrepresented in the record. Such analyses would help determine whether families synchronized their movements with transhumant herding, lowland harvest cycles, or the availability of unfrozen rock faces for fire-setting.
Despite these uncertainties, Cave 338 already forces a rethinking of how far and how high late Neolithic communities were willing to travel in pursuit of valued materials. The combination of a child’s bones, carefully managed hearths, and systematically broken green stone demonstrates that extreme-altitude landscapes were not empty margins but integrated parts of social and economic worlds. As further laboratory results and chronological refinements emerge, this small Pyrenean cave is likely to become a reference point in debates over when, where, and with whom Europe’s first miners went to work in the mountains.
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*This article was researched with the help of AI, with human editors creating the final content.
