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  2. Balinese copperplate inscription - Wikipedia

    en.wikipedia.org/wiki/Balinese_copperplate...

    The Balinese copperplate inscription or Sembiran inscription is a collection of ten copper plate inscriptions, which were found in the village of Sembiran, Tejakula district, Buleleng Regency, on the northern part of Bali island. [ 1][ 2] All inscription plates have a date, which is between 922 and 1181 CE, so they include more than 200 years. [ 3]

  3. Grasberg mine - Wikipedia

    en.wikipedia.org/wiki/Grasberg_mine

    PT Freeport Indonesia (PTFI) is the company that currently manages Grasberg mine. The mining company is a joint venture between Indonesian and American interests, with the Indonesian government through its state-owned company PT Mineral Industri Indonesia (MIND ID) and PT Indonesia Papua Metal & Mineral, a company co-owned by MIND ID and ...

  4. List of countries by copper production - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    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.

  5. Copper extraction - Wikipedia

    en.wikipedia.org/wiki/Copper_extraction

    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 ...

  6. Laguna Copperplate Inscription - Wikipedia

    en.wikipedia.org/wiki/Laguna_Copperplate_Inscription

    Laguna Copperplate Inscription. 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.

  7. IsaKidd refining technology - Wikipedia

    en.wikipedia.org/wiki/IsaKidd_refining_technology

    A modern copper refinery tankhouse using IsaKidd technology. The IsaKidd Technology is a copper electrorefining and electrowinning technology that was developed independently by Copper Refineries Proprietary Limited (“CRL”), a Townsville, Queensland, subsidiary of MIM Holdings Limited (which is now part of the Glencore group of companies), and at the Falconbridge Limited (“Falconbridge ...

  8. Copper electroplating - Wikipedia

    en.wikipedia.org/wiki/Copper_electroplating

    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 ...

  9. Gunawan Steel Group - Wikipedia

    en.wikipedia.org/wiki/Gunawan_Steel_Group

    Gunawan Group. The Gunawan Steel Group was an Indonesian steel group founded 1989, which owned several Steel works in Southeast Asia. The group's companies were taken over by the Indonesian Bank Restructuring Agency ( Badan Penyehatan perbankan Nasional, BPPN) in 1998 following financial problems as a result of the 1997 Asian financial crisis .