The earliest organized production and use of copper in different societies have been roughly dated as: Researchers now believe that copper came of regular use for a period - referred to as the ' Copper Age' - prior to its substitution by bronze.The substitution of copper for bronze occurred between 3500 to 2500 BC in West Asia and Europe, ushering in the Bronze Age.Pure copper suffers from its softness, making it ineffective as a weapon and tool.But early metallurgy experimentation by the Mesopotamians resulted in a solution to this problem: bronze.All three were stabbed, and Penny and Matthew were also shot.Charlie James Wilkinson, 18, Charles Allen Waid, 20 and Bobbi Gale Johnson, 18 are each charged with three counts of capital murder, but they are not alone.
"They probably thought twice about it." Kalie Beasley had known Bobbi Gale Johnson, Charles Waid's girlfriend, for years.
Bronze, an alloy of copper and tin, was not only harder but also could be treated by forging (shaping and hardening through hammering) and casting (poured and molded as a liquid).
The ability to extract copper from ore bodies was well-developed by 3000 BC and critical to the growing use of copper and copper alloys.
"If he wanted to be with Erin, there is no telling," said Mc Clanahan.
Authorities did recover one small caliber gun and a knife, both of the weapons used.