Since 2011, a more realistic question might be why do you want to find these ? Actually , I think this stock was over 1.75 in the penny stock silver market of 1968- not 1980 ?
Now to answer my own question. There was once a stock among the penny silvers called Independence Lead Mines which actually owned property next to the Lucky Friday mine. They had a royalty agreement from 1968 with Hecla mining that entitled them to 18% royalties once certain costs had been paid back. These costs were 30 million dollars so even in 2006, the stock traded for 80-90 cents per share with 5 million shares outstanding. It was 30 cents in 2002. A poster actually went on the yahoo hecla board to try to drum up interest in ildm and was told to shut up and stop promoting scam stocks that were on the pink sheets. In march of 2008, Hecla took over ildm for 1.2 shares of Hecla which was in excess of 10 per share. Of course Hecla almost went bankrupt in early 2009 so maybe our friend Snowball would still be right about the pink sheets. To answer your question a nut named David Bond wrote a book about the silver jrs in 2004. I bet you could pick it up for less than a buck not including mailing costs. There are more interesting ones still around like aslm and sbum which have property claims right near the operating Galena mine of Americas Silver.
Right now I have sold a lot of my wrn and ntcpf -ncx.v too early. Follow a guy named Dale Corman who owns a both of these companies and his friendship with Pan American silvers' Ross Beatty. One that has not taken off that he also owns some of is called copper north (col.v or us listing cpnvf )and has a market cap of about 3 million dollars. It's non economic deposits of gold and mostly copper in the frozen north of Canada. Ice cold stocks that will having you talking to yourself at the next party you are at. See what you think however be careful - I have no geologic background . This just a hunch that rising prices will make moose pasture valuable in the future!