This section is from "Scientific American Vol II. No. 1", by Munn & Co. Also available from Amazon: Scientific American Science Desk Reference.
Recently at the Copper Mines on Lake Superior, a "greenhorn" asked some miners to show him where to dig; they offered to do it, provided he would treat to a quart of "prairie dew," which he did, and they set him to work under a shady tree, in mere sport. Before night he struck a "Lead," and the next sold out for $4000.
 
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