Beverly, I am checking the 1909 History of Butler County on this mining question. Could you send surnames that I should be looking for. The only index in this book is by surname. I did find the following though: page 33, 20th Century History of Butler and Butler County, PA and Representative Citizens. Edited and Compiled by James A McKee, Butler, PA. 1909 The Lochrie Brothers Coal Company at Argentine employed eighty men in their Pennsylvania Mine No. 1 and had an output of 59,000 tons. This company is operating in Washington and Venango Townships. The Standard Coal Mining Company at Argentine employed eighty-nine men and had an output of 57,000 tons. The Nellie Coal Company employed seventy-eight men at their Nellie Mine in the same district, and had an output of 49,000. The Mutual Coal Mining Company employed seventy-one men at the Royal Mine, in the Argentine district, and had an output of 43,768 tons. There may be a book in the library on mining, you should email Luanne and ask her about that. Pat "Volunteer of Random Acts of Genealogical Kindness at http://www.raogk.org/"