What is copper?

Element 29, one of humanity's oldest metals

Copper is a chemical element with the symbol Cu — from the Latin cuprum — and atomic number 29. It is one of the very few metals that occur in nature in directly usable metallic form, which is why humans started working it roughly 10,000 years ago, long before the Bronze Age. Copper gave its name to an entire archaeological era: the Copper Age, or Chalcolithic, when smiths learned to hammer native copper into tools and ornaments. Alloyed with tin, it became bronze — the material of the Bronze Age — and alloyed with zinc it became brass. Few materials have been worked longer, and none has stayed relevant longer. What makes copper unusual among common metals is that it is still used in enormous quantities in nearly pure form. Most industrial metals are consumed as alloys — steel is iron plus carbon and friends — but a large share of the world's copper is refined to 99.99% purity as cathode and drawn into wire that is, chemically, almost the element itself. When you strip insulation off a piece of bare bright wire, you are holding one of the purest manufactured materials in everyday life.

Why nothing replaces it where electricity flows

Copper's defining property is electrical conductivity: it is second only to silver among all metals, and silver is far too expensive for infrastructure. That single fact explains roughly three-quarters of all copper use — about 75% of copper goes to electrical applications, from power transmission and generation to building wiring, telecommunications, and electronics, according to USGS figures. Copper is also the most ductile and malleable of the common industrial metals after gold and silver: it can be drawn into wire thinner than a hair or hammered into sheets without cracking, which is why the wire-drawing industry exists at essentially one metal's pleasure. It resists corrosion, forming a protective patina rather than rusting through like iron; it conducts heat exceptionally well, which is why it dominates heat exchangers, radiators, and cookware; and it is naturally antimicrobial, killing bacteria on contact — a property hospitals and plumbing systems have exploited for centuries. Then there is the property every scrapper knows by feel: density. Copper weighs 8.96 grams per cubic centimeter, noticeably heavier than steel at 7.8 and far heavier than aluminum at 2.7. A coil of copper wire is always heavier than it looks, and that heft is one of the fastest field clues you are holding real copper and not aluminum or copper-clad steel.

Ten thousand years of copper

The copper story runs in three acts. Act one is antiquity: native copper hammered into tools around 9000 BC, smelting developed by roughly 5000 BC, bronze transforming warfare and agriculture, and Rome mining copper at an industrial scale in Cyprus — the island that gave the metal its Latin name. Act two is the electrical age: once Faraday, Edison, and Tesla made electricity practical, copper became the nervous system of civilization. The telegraph, the telephone, the power grid, the automobile's wiring harness — every one of them is a copper story. Act three is the one we are living through now: electrification as climate and industrial policy. Electric vehicles use nearly three times the copper of conventional cars. A kilometer of high-voltage underground cable carries more than two and a half tons of copper. Data centers, wind turbines, and solar farms are all copper-intensive in ways their predecessors were not. Analysts at Wood Mackenzie call grid expansion and reinforcement the single most important driver of copper demand over the coming decades — the common denominator behind EVs, renewables, and AI. The metal your grandfather pulled out of a demolished factory is the same metal a hyperscale data center is buying by the kiloton today.

The most recycled metal in the world

Copper is, pound for pound, one of the most valuable common scrap metals — and one of the most recycled materials on earth. Roughly a third of global copper supply comes from recycling, and secondary production uses dramatically less energy than mining and refining new metal, which is why the recycling loop is structural rather than sentimental: mills, smelters, and foundries are built to consume scrap. For sellers, that creates a deep, liquid market. Unlike exotic alloys that need a specialty buyer, clean copper has buyers in every industrial region, and its value tracks the big public benchmarks — COMEX in New York and the LME in London — so pricing is transparent in a way few scrap markets are. The catch is that the market is also grade-sensitive: the difference between bare bright wire and a mixed, contaminated load is the difference between the top of the market and the bottom of it. Understanding the grades is what turns a pile of metal into a priced lot. That is exactly what the rest of this resource center is for.

Copper questions, answered.