Evidence of prehistoric copper mining found in high-altitude Pyrenees cave – The History Blog
https://www.thehistoryblog.com/archives/75989
"Archaeologists unearthed four layers of occupation: a thin top layer with a few artifacts from historical periods indicating it was barely used, ... and two middle layers with dense remains of combustion pits, animal bones, ceramic vessels and an extraordinary assemblage of green mineral fragments believed to be malachite."







