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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]
Copper concentrate is traded either via spot contracts or under long term contracts as an intermediate product in its own right. Often the smelter sells the copper metal itself on behalf of the miner. The miner is paid the price at the time that the smelter-refiner makes the sale, not at the price on the date of delivery of the concentrate.
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.
[8] [11] It was engraved in a 17.5-by-12-inch (440 mm × 300 mm) plate made of copper. The copperplate and seal weigh 24 pounds (11 kg). [2] There is a seal centered atop the copperplate. The seal extends about 5 inches into the main copperplate, dividing the first two lines of the script on each side of the plate.
Beryllium copper (C17200 & C17300) is an age-hardening alloy that attains the highest strength of any copper base alloy. It may be age hardened after forming into springs, intricate forms, or complex shapes. It is valued for its elasticity, corrosion resistance, stability, conductivity, and low creep. Tempered beryllium copper is C17200 and ...
Copper. face-centered cubic (fcc) (cF4) Copper is a chemical element; it has symbol Cu (from Latin cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orange color. Copper is used as a conductor of heat and electricity ...
The Kollam (Quilon) Syrian copper plates, also known as the Kollam Tarisappalli copper plates, document a royal grant issued by Ayyan Adikal, the chieftain of Kollam, to a Syrian Christian merchant named Mar Sapir Iso in Kerala, India. The inscription is engraved on six copper plates in Old Malayalam or early Middle Tamil, using Vattezhuthu ...
A typical Chola copperplate inscription currently displayed at the Government Museum, Chennai, India, is dated c. 10th century C.E.It consists of five copper plates stringed in a copper ring, the ends of which are secured with a Chola seal bearing in relief, a seated tiger facing the right, two fish to the right of this.