Mesabi® Screens The Mesabi® Vibrating Screen has long been a favorite for pit, quarry and mine operations that demand extra strength, extreme ruggedness and stubborn resistance to wear.  First developed for use on Minnesota’s renowned Mesabi Iron Range, the KPI-JCI Mesabi® Screen has undergone continued design improvements to meet the growing need for heavier, sturdier, more efficient and higher-capacity scalping and screening units.  Available as a bare unit or portable plant, sizes range from 4x8 to 6x14.