X0101 EFFECT 33 LIVE 2018-03-29 09:00:00

S-4

0000764065 CLEVELAND-CLIFFS INC. 333-223027 0001729020 CLF PinnOak LLC 333-223027-24 0001729022 Cliffs Empire Holding, LLC 333-223027-23 0001729021 Cliffs Empire, Inc. 333-223027-22 0001729023 Cliffs Empire II Inc. 333-223027-21 0001729024 Cliffs International Management Co LLC 333-223027-20 0001729025 Cliffs Mining Co 333-223027-19 0001729026 Cliffs Mining Holding, LLC 333-223027-18 0001729027 Cliffs Mining Holding Sub Co 333-223027-17 0001729030 Cliffs Mining Services Co 333-223027-16 0001729031 Cliffs Minnesota Mining Co 333-223027-15 0001729032 Cliffs Pickands Holding, LLC 333-223027-14 0001729035 Cliffs TIOP Holding, LLC 333-223027-13 0001729033 Cliffs TIOP, Inc. 333-223027-12 0001729043 Cliffs TIOP II, LLC 333-223027-11 0001729044 Cliffs UTAC Holding LLC 333-223027-10 0001729131 Empire Iron Mining Partnership 333-223027-09 0001729132 Lake Superior & Ishpeming Railroad Co 333-223027-08 0001729123 Marquette Range Coal Service Co 333-223027-07 0001729119 Northshore Mining Co 333-223027-06 0001729118 Pickands Hibbing Corp 333-223027-05 0001729117 Silver Bay Power Co 333-223027-04 0001729019 Cleveland-Cliffs Iron Co 333-223027-03 0001729114 Tilden Mining Co L.C. 333-223027-02 0001729113 United Taconite LLC 333-223027-01