Silver

This specimen, with an extremely rich vein of native silver in a carbonate vein matrix, contains minimal arsenide.

Silver was discovered on the shores of Cobalt Lake in the summer of 1903, and within a few years, Cobalt became one of the world's largest silver producers, supplying an astonishing 333 million ounces, or more than 10,000 tonnes, of silver by 1922 from 100 mines. This particular specimen comes from the Cobalt Lode Mine, a silver-cobalt-nickel-copper mine discovered in 1908. The mine was owned by Pan Silver Mines from 1908 to 1915, Adanac Silver Mines from 1915 to 1949, Cobalt Lode Silver Mines from 1949 to 1953, Cobalt Consolidated Mining Corp. from 1953 to 1957, and by Agnico Mines thereafter. Total production to the end of 1957 was 4,500,000 ounces of silver.

*https://www.mindat.org/loc-10140.html