Event

Bronze Age

The period defined by bronze as the principal material for tools and weapons, roughly 3300–1200 BCE in the Near East.

The Bronze Age is an archaeological period named directly for a material, which is unusual and revealing: the defining fact about the era, from the evidence available, is what people made things from.

It begins at different dates in different regions — around 3300 BCE in the Near East, considerably later elsewhere — and its end is marked in the eastern Mediterranean by a widespread collapse around 1200 BCE, after which iron became dominant.

Economic significance

Bronze required copper and tin, and the two rarely occur together. The resulting need for long-distance trade in tin created some of the earliest recorded international commercial networks, and made bronze-using societies structurally dependent on their maintenance.

Medium confidence Weak evidence

How we know: checked recently · only one source, so there is nothing to cross-check it against · stated directly by the source.

How this connects

Where a connection has been confirmed by an outside reference, that reference is named beside it.

involved

Bronze socketed axe — object
Bronze — alloy · the alloy the period is named for
Lead — element · lead was smelted alongside copper from the earliest metallurgy

Sources

Material World
Our own writing

Where it comes from, and what it becomes

Follow Bronze Age back to what it starts as, and forward into what it becomes. Each step is a documented one — a real route material takes, not a chain of inference.

Upstream — what it comes from

Bronze Age → involved (the alloy the period is named for) → Bronze → is composed of → Copper → is produced by (as blister copper, refined electrolytically afterwards) → Smelting → takes as input (as the element removed, not added) → Oxygen → is produced by (the largest output by tonnage, and the reason air separation units sit beside steelworks) → Air separation
Bronze Age → involved → Bronze socketed axe → is made using (cast in a two-piece mould with a core, which is what bronze does better than the copper it replaced) → Bronze → is composed of → Copper → is produced by (as blister copper, refined electrolytically afterwards) → Smelting → takes as input (roasted to drive off sulfur, then reduced to copper) → Chalcopyrite
Bronze Age → involved (lead was smelted alongside copper from the earliest metallurgy) → Lead → is produced by (as the oxide, from galena, by the same route) → Roasting → takes as input (a copper sulfide; roasting drives off the sulfur that would otherwise prevent reduction) → Chalcopyrite
Bronze Age → involved (the alloy the period is named for) → Bronze → is composed of → Copper → is extracted from (the principal copper ore worldwide) → Chalcopyrite
Bronze Age → involved (lead was smelted alongside copper from the earliest metallurgy) → Lead → is produced by (as the oxide, from galena, by the same route) → Roasting → takes as input (roasted for its sulfur as much as for its iron) → Pyrite
Bronze Age → involved (lead was smelted alongside copper from the earliest metallurgy) → Lead → is produced by (as the oxide, from galena, by the same route) → Roasting → takes as input (roasted to the oxide, the sulfur going to an acid plant rather than the air) → Galena

These are the most distinct paths back. Bronze Age can be traced through others besides.