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The Laguna Copperplate Inscription (Filipino: Inskripsyón sa binatbát na tansô ng Laguna) is an official acquittance (debt relief) certificate inscribed onto a copper plate in the Shaka year 822 (Gregorian A.D. 900). It is the earliest-known, extant, calendar-dated document found within the Philippines. [1]
Production trends in the top five copper-producing countries, 1950-2012. This is a list of countries by mined copper production. Copper ore can be exported to be smelted so that a nation's smelter production of copper can differ greatly from its mined production. See: List of countries by copper smelter production.
Recycling is a major source of copper in the modern world. [33] Price of Copper 1959–2022. The price of copper is volatile. [35] After a peak in 2022 the price unexpectedly fell. [36] The global market for copper is one of the most commodified and financialized of the commodity markets, and has been so for decades. [37]: 213
Copper(II) ions migrate through the electrolyte to the cathode. At the cathode (reduction reaction), Cu 2+ ions are reduced in copper metal and Cu (s) plates out, but less noble constituents such as arsenic and zinc remain in solution unless a higher voltage is used. [52] The reactions involving metallic copper and Cu 2+ ions at the electrodes ...
Former headquarters (demolished in 2015) The company was established in 1876 with 16 members, including the founder, Takashi Masuda. By the end of World War II, it had become a dominant trading giant, but was dissolved by the order of GHQ. [1] The current Mitsui & Co. was established in 1947 as Daiichi Bussan Kaisha, Ltd.
Tin mining is one of the earliest type of mining operated in Malaysia, starting in the 1820s in Perak and in 1824 in Selangor. [1] The development of mining industries in Malaysia attracted many Chinese immigrants who came to the state in 18th and 19th centuries to work and develop the mines. [2] The majority of Malayan tin mined prior to the ...
Copper electroplating. Copper plating on aluminium. Copper electroplating is the process of electroplating a layer of copper onto the surface of a metal object. Copper is used both as a standalone coating and as an undercoat onto which other metals are subsequently plated. [ 1 ] The copper layer can be decorative, provide corrosion resistance ...
The Thomas of Cana copper plates feature heavily in the history and traditions of the Knanaya community in Kerala. According to the community's traditional origins, Thomas of Cana, a Syrian merchant led a group of 72 Jewish-Christian immigrant families, a bishop named Uraha Mar Yausef, and clergymen from the Middle East to settle in Cranganore, India in the 4th century (some sources place ...