Apr 14, 2017 Number 5 Minnesota. First up is the Land of 10,000 Lakes at number five. Minnesota slipped a place this year, falling from fourth overall in 2015. Iron ore is the primary mineral commodity by value in Minnesota, which leads the country in iron ore production. Mineral Industry Value $3.27 billion. In value terms, limestone flux imports stood at $740M in 2016. Overall, it indicated a remarkable increase from 2007 to 2016 the total imports value increased at an average annual rate of Prodcom 08112050 - Limestone flux, limestone and other calcareous stone used for the manufacture of lime or cement (excluding crushed limestone aggregate and calcareous dimension stone) This report provides an in-depth analysis of the market for gypsum, anhydrite and limestone in the EU.