Copper

specimen number:
8311520

location:
Itauz Mine, Satpayev, Ulytau, Kazakhstan

description:

A sharp loose twinned double terminated crystal of native copper. Superb example for the species, in great condition. The patina on this makes it especially nice.

The Itauz mine, situated within the Dzhezkazgan mining district in the Karaganda Region of Kazakhstan, is a prominent open-pit and underground copper operation internationally celebrated for producing exceptional, large specimens of sharply twinned native copper crystals. Geologically, this major deposit is hosted within a thick sequence of late Paleozoic carboniferous sandstones and siltstones, classified as a classic sediment-hosted stratiform copper system where metal-bearing basin fluids precipitated copper sulfides and native metals into the porous sedimentary layers. Within the oxidized zones near the surface, complex geochemical reactions favored the growth of native copper, which frequently formed highly distorted spinel-law twins and complex branching arborescent groups within open pockets and fractures. Historically, while regional copper mining by indigenous peoples dates back centuries, the modern industrial exploitation of the Itauz deposit accelerated significantly under the Soviet government in the late twentieth century, transitioning into large-scale, mechanized open-pit quarrying and associated underground development by Kazakhmys in the early 2000s. The site reached peak specimen production during the mid-2000s and 2010s, supplying the global mineral market with world-class, elongated copper twins that are often naturally coated in thin layers of dark cuprite or green malachite. Through 2026, the Itauz mine remains actively worked as part of the broader Dzhezkazgan operations, continuing commercial base-metal extraction while serving as a premier Eurasian geological benchmark for studying supergene copper reduction within thick continental sandstone sequences.

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