Jay Taylor, in the June 17, 2015, edition of Gold, Energy & Tech Stocks, refreshes his buy of Robert Archer's Great Panther Silver Ltd., recently 57 cents. Mr. Taylor said buy six times from May 1, 2004, to Dec. 16, 2011, at prices ranging from 41 cents to $3.86. Along the way, he said sell half on April 16, 2007, at $2.08 and the rest on Dec. 20, 2012, at $1.51. Assuming a $1,000 investment for each buy, the two sales yielded profits of $2,139 and $2,110. Mr. Taylor said buy again on June 19, 2013, at 78 cents and Dec. 18, 2014, at 86 cents. A $1,000 investment for each of those two buys is now worth $1,393. Great Panther is one of Mr. Taylor's favourite silver producers. Its core country is Mexico, where it owns the Guanajuato, Topia and San Ignacio mines, as well as a recently acquired option on the Guadalupe de los Reyes project. A few weeks ago, Great Panther announced an expansion into a new country, Peru. It has signed an option to buy the Coricancha mine in the Andes. Mr. Taylor predicts that these projects could take annual production to 10 million ounces of silver equivalent (compared with 3.2 million in 2014). If he is right, "this moment may well prove to have been one of those times of regret for not picking up a few shares."