Discovery of pure native copper mine on Superior - Thermodon in the land of the Amason Iroquois Confederacy, from translation of a Greek Mythology.

For size and depth preception I have laid a credit card on the floor of this secondary chamber within a mine, as shown above.

This wide vein was followed into what the ancient miners called a Sea.
The rock matrix protected by an opposing 90 degree angle to the waves is identical to nearby rock with a similar, less interesting, and smaller vein that remains flat and uneroded by a direct pounding from the ice and waters of Thermodon. The difference is 4 feet of rock removed above this varied and interesting vein that was perceived to perhaps open onto a copper nodule.