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Há 4 dias · On the other hand, copper is a material with small ρ and large σ — because even a small electric field pulls a lot of current through it. This expression simplifies to the formula given above under "ideal case" when the resistivity is constant in the material and the geometry has a uniform cross-section.
Há 2 dias · “The combination of 2024’s copper concentrates supply volumes pegged with the annual benchmark number means copper smelters with a high proportion of contractual supplies could still survive because they have locked many of their volumes at or closer to $80 [per tonne] and they could afford extremely low spot TCs.
Há 5 dias · The Bell Beaker culture, also known as the Bell Beaker complex or Bell Beaker phenomenon, is an archaeological culture named after the inverted-bell beaker drinking vessel used at the very beginning of the European Bronze Age, arising from around 2800 BC.
Há 1 dia · Geological Significance. The Quesnel Trough, also known as the Quesnel Terrane, is an arc of volcanic sedimentary rocks from the Triassic-Jurassic period. This region hosts several significant copper-gold porphyry deposits, including those currently being mined at Mount Milligan and Mount Polley. Geoscience BC, in collaboration with the BC ...
Há 5 dias · El Teniente is rumored to be the world's largest underground copper mine. Located in the Andes region in Chile, this historic mine began operating as early as 1819 and still continues today. The venture is owned by Corporacion Nacional del Cobre de Chile and produced an impressive 397,320 tonnes of copper in 2023.
Há 5 dias · Head of Commodity Strategy. Key points. Copper continues to consolidate amid recent weakness that was triggered by last months premature surge to record highs. Having retraced around half the strong rally focus is turning to China and data reflecting the state of the physical market.
Há 3 dias · Cobalt - Wikipedia. Cobalt is a chemical element; it has symbol Co and atomic number 27. As with nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, somewhat brittle, gray metal .
