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Posted by / 13-Jul-2018 10:28

Dating website oak creek wisconsin

The prolonged crystallization, followed by glacial exposure, was a unique sequence of events.When exploited, it took man from the stone age to an industrial world.Buried hoards of bronze are usually composed of broken axeheads, miscellaneous broken pieces, and lumps, recycling the valuable metal.Henderson’s book (Ref.19) reports a German study that did 12,000 [!Copper is said to be the most common metal on the face of the Earth with the exception of iron.However, most of it is in the form of low-grade ores that require a sequence of concentration mechanisms to upgrade it to exploitable ore through a series of proto-ores.

They were not able to do this, but noted that “hoards which often contain low impurity metal in South-Eastern England and Northern France may be linked to the occurrence of copper ingots, which also had low impurities.” Barber (Ref.28) says that “ingot (or ‘cake’) fragments are a common feature of founder’s hoards of the late Bronze Age, and often comprise pure, unalloyed copper.” Barber says only one mining site in the British Isles (Great Orme) shows evidence of activity after the early Bronze Age.After a billion years, about a quarter of the age of the Earth, four major glaciations ground upon the edges of the old layered basalt lava beds, and exposed some of the embedded copper (Fig.2, top drawing).Isle Royale and the Keweenaw Peninsula remained high ridges of volcanic basalt.Born 1943, grew up on Mercer Island, Washington, and Truro, Cape Cod, with several years on a sailboat in the Bahamas.He was educated at Dartmouth and the University of Washington, in Biology.

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The half billion pounds mined in prehistory were followed by six and a half billion pounds mined in the “industrial age” in America, starting in the late 1800s Most European copper was smelted out of copper ores starting about 4460 BC.

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