Mehrgarh copper amulet shows lost-wax casting reaches the Indus Valley

Story: 4000 B.C.E.  |  Last updated: January 9, 0001

Around 6,000 years ago, a craftsperson in what is now Mehrgarh, Pakistan, created something that had never quite existed before: a wheel-shaped copper amulet, small enough to hold in one hand, made by a method so elegant it would still be in use six millennia later. The technique was lost-wax casting — and this object is the oldest known example of it applied to copper.

Key findings

• Lost-wax casting: The Mehrgarh amulet, dated to approximately 4000 B.C.E., is the earliest known object produced by applying the lost-wax method to copper — a milestone in the history of metalworking.
• Mehrgarh site: Located in the Balochistan region of present-day Pakistan, Mehrgarh was one of the most sophisticated Neolithic and Chalcolithic settlements in South Asia, with evidence of farming, craft production, and trade going back to roughly 7000 B.C.E.
• Copper amulet: The wheel-shaped object is small and ornamental, but its significance far outweighs its size — it demonstrates that artisans in the Indus Valley had mastered a complex multi-step casting process at a remarkably early date.

What lost-wax casting actually involves

The process begins with a model sculpted in wax. That model is coated in clay or another refractory material, then heated. The wax melts and drains away — it is “lost” — leaving a hollow mold. Molten metal is poured in, fills the cavity, and once cooled, the outer shell is broken away to reveal a metal object that precisely matches the original wax form.

It sounds deceptively simple. But getting it right demands an understanding of heat, material behavior, and proportion that took generations to develop. The craftsperson who made the Mehrgarh amulet wasn’t improvising. They were working within a tradition.

The technique allows for detail and complexity that basic hammering or simple casting cannot achieve. Curved surfaces, hollow forms, and intricate decorative elements all become possible. That versatility is precisely why the method never became obsolete.

A world already experimenting with metal

Mehrgarh did not develop in isolation. By 4000 B.C.E., the broader region stretching from the eastern Mediterranean to South Asia was entering what archaeologists call the Chalcolithic — the Copper Age — a period of intensive experimentation with metal.

Gold objects made using what appears to be lost-wax casting have been found at Bulgaria’s Varna Necropolis, dated to approximately 4550–4450 B.C.E. — making those the oldest known lost-wax artifacts overall, predating Mehrgarh by several centuries. Objects from the Nahal Mishmar hoard in what is now southern Israel, dated to around 3500–3700 B.C.E., show the technique being applied across the Levant during the same broad era.

What makes Mehrgarh distinct is the material: copper. Working copper through lost-wax casting introduced new challenges — copper’s melting point, its behavior under heat, and its tendency to oxidize all required solutions that gold, more forgiving and workable, did not demand. The Mehrgarh craftsperson solved those problems.

The Indus Valley’s longer tradition

Mehrgarh’s copper amulet is an early data point in a long arc. The Indus Valley Civilization, which flourished from roughly 3300 to 1300 B.C.E., produced some of the most technically accomplished metalwork of the ancient world. Among the most celebrated is the “Dancing Girl” of Mohenjo-daro — a small bronze figurine dated to approximately 2300–1750 B.C.E., cast using the same lost-wax process pioneered centuries earlier at sites like Mehrgarh.

Artisans across the subcontinent continued refining the technique. Post-Harappan workshops in Tamil Nadu, Uttar Pradesh, Bihar, Odisha, and elsewhere produced copper and bronze implements through lost-wax methods. Buddhist and Hindu iconography would later rely on this tradition for some of its most enduring images — bronze icons produced during the 3rd and 4th centuries C.E. represent a direct continuation of knowledge that began in the Chalcolithic.

South Asian metalworking traditions are sometimes treated as derivative of developments in Mesopotamia or the Mediterranean. The Mehrgarh amulet complicates that picture. It places sophisticated copper casting in the Indus Valley at a date that is, at minimum, contemporaneous with — and in this specific application, earlier than — comparable developments elsewhere.

Lasting impact

Lost-wax casting spread across the ancient world and never really stopped. Mesopotamian metalworkers were using it by approximately 3500–3200 B.C.E. It became the dominant method for bronze sculpture across Greece, Rome, and sub-Saharan Africa — the Benin bronzes of present-day Nigeria, created from roughly the 13th century C.E. onward, are among the technique’s most celebrated expressions.

In dentistry today, gold crowns are still made using a form of lost-wax casting. Aerospace and automotive industries use an industrial descendant of the method — investment casting — to produce components that require precise tolerances. The foam-casting technique used to make some engine blocks is a direct variation on principles worked out in clay and wax six thousand years ago.

When we talk about ancient technological knowledge, we often imagine a clean line between past and present. Lost-wax casting does not allow for that fiction. The process a craftsperson in Mehrgarh used to shape a small copper wheel is, in its essentials, the same process used to make a turbine blade today.

Blindspots and limits

The archaeological record of early metalworking is thin and uneven. What survives tends to be what was buried, preserved in dry conditions, or made from materials that don’t corrode easily — meaning we almost certainly have a partial picture of where and when lost-wax casting was practiced. The craftspeople at Mehrgarh left no written record of their methods, their training, or their social organization. We know what they made; we know almost nothing about who they were or how knowledge passed between them and communities elsewhere. The technique may have developed independently in multiple places, but the evidence to confirm or rule that out simply doesn’t exist yet.

Read more

For more on this story, see: Wikipedia — Lost-wax casting

For more from Good News for Humankind, see:

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• The Good News for Humankind archive on Pakistan

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