 Some outstanding examples of Philippine jewelry included necklaces, belts, armlets and rings placed around the waist.During prehistoric times, large amounts of copper was mined along Lake Superior's Keweenaw Peninsula and in nearby Isle Royale; metallic copper was still present near the surface in colonial times.Indigenous peoples used Lake Superior copper from at least 5,000 years ago; copper tools, arrowheads, and other artifacts that were part of an extensive native trade network have been discovered.