This native copper conglomerate is from the Kingston Mine in Copper City, Keweenaw County, Michigan, USA. This was an underground mine formerly operated by the C & H mines that closed in 1968. It produced mostly copper and some silver from ores mined from conglomerate deposits or sedimentary beds of pebbles and cobbles. The pebbles were cemented together or impregnated with copper that was deposited from solution about one billion years ago. This piece is typical for the deposits. It is made up of mostly rounded jasper pebbles and resembles a pudding stone. The copper which appears as small dark blebs and irregular patches in the photos can be shined to a metallic luster. This stone measures 9 1/2 x 5 x 4 inches and it weighs 9 pounds 7 oz.