sentences:  The consolidated Cleveland-Cliffs invested substantial sums in operations to improve the logistics of iron-ore transport.In 1892, the firm built the Lake Superior and Ishpeming Railroad to carry iron ore from the mines directly to company-owned docks on Lake Superior.William G. Mather, the son of Samuel, guided Cleveland-Cliffs as president and later as chairman of the board during the period of 1890–1947, participating in the transition from the hard-rock iron ore of Upper Michigan to the soft hematite of Minnesota's Mesabi Range and adjacent lodes.