Inter-Rock Minerals Inc. announced today that it has sold its Oklahoma based dolomite business, Mill Creek Dolomite to United States Lime & Minerals Inc. for U.S.$6.40 million in cash, excluding Mill Creek debt and accrued interest of U.S.$2.24 million that was repaid at closing on February 9, 2022 with a portion of the proceeds of the sale in accordance with the terms of the sale agreement.