Malachite with Calcite

specimen number:
1655511

location:
Great Orme, Llandudno, Conwy, Wales, UK

description:
Green crystallized malachite quite rich across the top of this large matrix with crystallized dolomite. Calcite is present as well. Good large cabinet example from this old locality.

The Great Orme, a prominent limestone headland rising above Llandudno in North Wales, contains one of the most significant prehistoric copper mines in the world. Geologically, the mineralization is hosted within Carboniferous Limestone, where copper-bearing fluids deposited primary minerals like chalcopyrite and secondary malachite and azurite along faults and bedding planes. These epigenetic deposits were particularly accessible to early miners because the copper ore was concentrated in soft, weathered "feeder" zones within the hard rock. Historically, the site is remarkable for its Bronze Age operations, which began approximately 4,000 years ago around 1850 BC and continued for nearly a millennium until about 900 BC. During this peak period, prehistoric miners used stone hammers and bone tools to excavate over five miles of tunnels, making it the largest known structural prehistoric mine in Europe. While the site saw limited Victorian-era prospecting and small-scale mining in the 18th and 19th centuries (specifically between 1830 and 1881), its primary historical legacy remains the massive industrial-scale production of copper that fueled the British Bronze Age.

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