This designer shaped cabochon of Kingston Conglomerate has lots of shimmer from the copper. An underground copper mine located between Allouez and Ahmeek, MI. The Kingston Mine was opened by Calumet & Hecla on the Kearsarge Conglomerate in 1964, making it the last mine shaft opened by C&H. The mine consisted of one incline shaft that was worked to the 12th level. The mine closed in 1968 due to a labor strike. Specimens from Kingston include copper, silver, cuprite, and epidote.Copper is one of the most famous and useful metals, and has been important since ancient civilizations for ornaments and coinage. Its complex crystals can be beautifully formed in odd and unique masterpieces that are treasured by collectors. Michigan's Keweenaw Peninsula is the most important locality in the world for pure native copper. Mining began in 1845 and continued until 1968 and over 5 million tons of refined copper were recovered from Michigan's copper mines. In the early 1900's it led the world in copper production and "Lake Copper" was the purity standard to which other refined copper was compared. Long before the mining operations of the past century began in the Keweenaw, pre-historic peoples mined copper from the mineral rich veins.