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  2. Copper Fire - Wikipedia

    en.wikipedia.org/wiki/Copper_Fire

    The Copper Fire was a wildfire in Los Angeles County, Southern California, in June 2002. ... By the end of the day, the fire had burned 1,500 acres (610 ha ...

  3. Chalcolithic - Wikipedia

    en.wikipedia.org/wiki/Chalcolithic

    In Britain, the Chalcolithic is a short period between about 2,500 and 2,200 BC, characterized by the first appearance of objects of copper and gold, a new ceramic culture and the immigration of Beaker culture people, heralding the end of the local late Neolithic.

  4. Three-age system - Wikipedia

    en.wikipedia.org/wiki/Three-age_system

    The Copper, Bronze, and Iron Ages are also known collectively as the Metal Ages. [ 3 ] [ 4 ] In history, archaeology and physical anthropology , the three-age system is a methodological concept adopted during the 19th century according to which artefacts and events of late prehistory and early history could be broadly ordered into a ...

  5. Metallurgy during the Copper Age in Europe - Wikipedia

    en.wikipedia.org/wiki/Metallurgy_during_the...

    It seems that the copper was not used for the miners' tools. However copper chisels and discarded axes could be utilized as wedges. [16] Other evidence: The presence of coal and charcoal, crucial for the firing (fire-setting) and furnace (fuel), is habitual. Leather sacks (at Ai Bunar) and shoulder baskets (at Copa Hill) were used to transport ...

  6. Smelting - Wikipedia

    en.wikipedia.org/wiki/Smelting

    Combining copper with tin and/or arsenic in the right proportions produces bronze, an alloy that is significantly harder than copper. The first copper/arsenic bronzes date from 4200 BC from Asia Minor. The Inca bronze alloys were also of this type. Arsenic is often an impurity in copper ores, so the discovery could have been made by accident.

  7. Iron Age - Wikipedia

    en.wikipedia.org/wiki/Iron_Age

    Very early copper and bronze working sites in Niger may date to as early as 1500 BC. There is also evidence of iron metallurgy in Termit, Niger from around this period. [ 16 ] [ 74 ] Nubia was a major manufacturer and exporter of iron after the expulsion of the Nubian dynasty from Egypt by the Assyrians in the 7th century BC.

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  9. Speculator Mine disaster - Wikipedia

    en.wikipedia.org/wiki/Speculator_Mine_disaster

    The Granite Mountain/Speculator Mine disaster of June 8, 1917, occurred as a result of a fire in a copper mine, and was the most deadly event in underground hard rock mining in United States history. Most men died of suffocation underground as the fire consumed their oxygen; a total of 168 miners were killed.