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Sure!!
For those in MN here's the geology map of MN http://www.lakesuperiorstreams.org/understanding/mn_geology_map.pdf

There's old slate mines south of Duluth, I'm going up there sometime this spring/summer and check it out

Ok, I'll hold the rope, you go up there and get the hones

How did you lap that?

Very cool!! I'm up for hone hunting anytime!!