Handwritten notes about Liddel's Pyrite Works which first worked about 100 years as the Derwent Gully Pyrites Works. Notes give description of how Liddel's Pyrite extracted the gold and collected arsenic which was sold to manufacturers as sheep-dip, weed poison, etc. Also mentioned is Leggo's Burner which started operations, 1906 and closed about 1949 or 1950.document, gold, liddel's pyrites works, liddel's pyrites works & leggo's burner, pyrites