1988

D.G. Harris & Associates (DGHA) founded; DGHA acquired American Salt Company with Lyons Mine and Carey Salt with Hutchinson Mine.

1989

DGHA acquired Chicago Plant from Domtar Chemicals Limited.

1990

DGHA founded North American Salt Company (NASCO) as a holding company; acquired Sifto Salt from Domtar with Goderich, Amherst, Milwaukee and Unity operations; divested Lyons Mine of American Salt and Hutchinson Mine of Carey Salt to acquire Cote Blanche Mine.

1991

Big Quill Resources, Canadian sulphate of potash producer, founded. Big Quill acquired Wynyard Plant.

1993

DGHA acquired Great Salt Lake Minerals with Ogden SOP and Magnesium Chloride Plants; opened Ogden Salt Plant; acquired Salt Union with Winsford Mine and founded Harris Chemical Group as a holding company for salt operations.

1997

IMC Global acquired Harris Chemical Group and founded IMC Salt as the holding company.

1998

DeepStore founded to make use of underground space in U.K. salt mine; Kenosha Plant acquired.

1999

Wolf Trax, Inc., Canadian micronutrient company, founded.

2001

IMC Salt acquired by Apollo Management through an entity called Compass Minerals Group.

2003

Compass Minerals sold through an IPO on the NYSE after Apollo Management changed IMC Salt to Compass Minerals.

2005

Ogden Magnesium Chloride Plant was rebuilt.

2006

DeepStore became a wholly owned subsidiary of Compass Minerals.

2009

Compass Minerals acquired salt business of Cutler-Magner with Duluth Plant.

2011

Compass Minerals acquired Big Quill Resources with Wynyard Plant.

2014

Compass Minerals acquired Wolf Trax, Inc.

2015

Compass Minerals built and opened Buffalo Packaging Plant.

KEY:

FOUNDED

DIVESTED

OPENED

ACQUIRED

ACQUIRED BY NEW HOLDING COMPANY