• 1869 Tripoli discovered at Seneca, Missouri, U.S.A.
  • 1871 First commercial application, a polishing brick called “American Bath Brick” by Monarch Tripoli Co.
  • 1885 First grinding mill built.
  • 1888 American Tripoli Company organized.
  • 1891 Incorporation of American Tripoli Company.
  • 1919 Purchased by Barnsdall Corporation.
  • 1920 New grinding mill built.
  • 1931 Name changed to Barnsdall Tripoli Company.
  • 1935 Name changed to Barnsdall Tripoli Corporation.
  • 1939 New steel mill built to replace old mill destroyed by fire.
  • 1947 J. C. Miller and Associates purchased the company.
  • 1954 Carborundum Company purchased the company.
  • 1969 100th Year anniversary of discovery.
  • 1982 Warburg, Pincus, Inc. of New York purchased the company.
  • 1986 Canadian Pacific purchased the company and directed operations to NYCO┬« Minerals, Inc.
  • 1991 100th Year anniversary of incorporation.
  • 2002 Canadian Pacific assigned responsibility of NYCO and American Tripoli to Fording Coal.
  • 2007 Resource Capital Funds purchased NYCO & American Tripoli.
  • 2012 S&B Industrial Minerals purchased NYCO & American Tripoli.
  • 2014 American Tripoli became certified in ISO 9001, ISO 14001, and OHSAS 18001.
  • 2015 lmerys purchased S&B Industrial Minerals.
  • 2016 Bruce Anderson, manager of 23 years, purchased the company from Imerys.