Illinois - Midwest ProspectorReported occurrences of gold in Illinois (SEE MAP AT RIGHT). 1. STEPHENSON COUNTY - minor gold in quartz nodules encountered in small zinc mine. 2.illinois gold mining,Illinois Creek Gold Mine - Ground Truth TrekkingDec 22, 2010 . Summary. The Illinois Creek Mine gold and silver mine in west central Alaska operated briefly in 1997, but the mining company went bankrupt.