There's a new round of mineral exploration in Northeastern Minnesota. The region best known for iron-bearing taconite could soon produce precious minerals like gold, silver and platinum - maybe even diamonds. New developments are making the prospects of prospecting more appealing. Minnesota Public Radio's Bob Kelleher reports: {A barge, floats on an island studded lake near Ely. It's actually several barges strung together; one equipped with a rotating drill - another stacked with dozens of rusty steel pipe-sections. Dick Backstrom's drilling company is looking for riches under Birch Lake.