 OVERLAND PARK, Kan.--BUSINESS WIRE--Compass Minerals NYSE: CMP, a leading global provider of essential minerals, announced today that it is postponing the issuance of its second-quarter 2021 financial results, as well as its previously scheduled second-quarter 2021 earnings conference call. Management has corrected its interim inventory valuation methodology resulting in the identification of a historical understatement of first-quarter operating income, which is completely offset in subseq 