Isle Royale mines read in the lake mud: 6500–5400 years ago (McCargoe Cove, Isle Royale, Lake Superior; study 2015)

SUMMARYIsle Royale mines read in the lake mud: 6500–5400 years ago (McCargoe Cove, Isle Royale, Lake Superior; study 2015) [Connections: Tech of the Americas, Nov 5, 2026]

RECORDA 2015 study by David P. Pompeani and others, "Copper mining on Isle Royale 6500–5400 years ago identified using sediment geochemistry from McCargoe Cove, Lake Superior," measured lead (Pb) pollution in lake-sediment cores. It placed mining at "6500 to 5400 yr BP." The report also says: "After 5000 yr BP, lake sediment records from McCargoe Cove on Isle Royale do not contain any significant Pb increases until European settlement."

PATTERNThe mining left a chemical signature in the lake, the same kind of evidence used to date ancient mining in Europe. A dated industry, then a long quiet, then the 1840s copper rush

LENS (WW9)The pollution record is a receipt the earth kept. Mining on this island did not start with the companies

OPENThe page fetched is a secondary report (novoscriptorium.com) and did not name the journal. Confirm the journal (believed to be in a peer-reviewed geoscience journal, needs checking) and read the paper

SOURCENovoscriptorium summary of Pompeani et al. 2015.