found and smelted. Remains of Bronze Age copper mines can be found, for instance, in various parts of...place, forming secondary enriched deposits of chalcocite and sometimes of argentite. The 49 14 Section...can also concentrate on one or a few particular mines but only if these are being worked at the time and...hand lens with 10 X magnification. Quarries and mines are the best places to visit, but it is usually...cavities of certain basaltic lavas. USA - copper mines of Keeweenaw Peninsula, Michigan, crystals ( ! |