Mound 34 is located in Illinois

Mound 34 is a small platform mound located roughly 400 metres (1,300 ft) to the east of Monks Mound at Cahokia Mounds near Collinsville, Illinois. Excavations near Mound 34 from 2002–2010 revealed the remains of a copper workshop, although the one of a kind discovery had been previously found in the late 1950s by archaeologist Gregory Perino, but lost for 60 years. It is so far the only remains of a copper workshop found at a Mississippian culture archaeological site.^[1]

• http://en.wikipedia.org/wiki/Mound 34