Here is a nice Silver (with small amounts of copper)Mill Nugget from Quincy Mill,  Mason, Michigan. It measures approximately 3/8″ x 5/8″ x 1/8″ and comes in a protective plastic display case measuring 1 3/4″ x  1/4″.  This very rare native metal combination is only found in the Keweenaw Peninsula of Michigan. These extra nice specimens are getting rare and generally no longer available to the public.