The staple export trade is in fish and their products; other exports are butter, copper ore and hides.
Much iron and copper ore is shipped from the Duluth-Superior harbour; and large quantities of coal, brought by lake boats, are distributed from here throughout the American and Canadian North-west.
Coal and iron are occasionally met with, and traces of copper ore are to be found in places, but none of these minerals exists in sufficiently large deposits to make mining remunerative.
By the ancients copper-pyrites was included with other minerals under the term pyrites, though the copper-ore from Cyprus referred to by Aristotle as chalcites may possibly have been identical with this mineral.
The Swansea Valley canal has a connecting lock with this dock, and on the island between the dock and the New Cut are patent fuel works, copper ore yards and other mineral sheds and large grain stores and flour mills.
