Robert Laidlaw February 1, 2012 John Sinkankas at the Esmeralda Mine, April 1962 Robert Laidlaw February 1, 2012 February 1, 2012A scrapbook page from John Sinkankas. View fullsize Esmeralda Mine scrapbook page from John Sinkankas, Apr 1962. Collection of Bill Larson.Click to enlarge.