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From: rbowman <bowman@montana.com>
Newsgroups: alt.folklore.computers,comp.os.linux.misc
Subject: Re: The joy of Technology
Date: 3 Nov 2024 23:35:48 GMT
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On Sun, 3 Nov 2024 20:59:45 -0000 (UTC), Lawrence D'Oliveiro wrote:

> That level of technology is called “chalcolithic”. That is, they mainly
> use fine stone tools, but they have also found a limited use for copper,
> which can be found lying around pure in some places, is easily workable
> but too soft to do much with. And they haven’t yet developed smelting
> technology to extract metals from ores and create harder alloys out of
> them, like bronze.

https://en.wikipedia.org/wiki/Metallurgy_in_pre-Columbian_Mesoamerica

South and Central America advanced beyond hammering out found copper. 
There isn't much evidence in North America.