UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

NOTICE OF EFFECTIVENESS

Effective Date: March 29, 2018
Form: S-4
CIK: 0000764065
Company Name: CLEVELAND-CLIFFS INC.
File Number: 333-223027
CIK: 0001729020
Company Name: CLF PinnOak LLC
File Number: 333-223027-24
CIK: 0001729022
Company Name: Cliffs Empire Holding, LLC
File Number: 333-223027-23
CIK: 0001729021
Company Name: Cliffs Empire, Inc.
File Number: 333-223027-22
CIK: 0001729023
Company Name: Cliffs Empire II Inc.
File Number: 333-223027-21
CIK: 0001729024
Company Name: Cliffs International Management Co LLC
File Number: 333-223027-20
CIK: 0001729025
Company Name: Cliffs Mining Co
File Number: 333-223027-19
CIK: 0001729026
Company Name: Cliffs Mining Holding, LLC
File Number: 333-223027-18
CIK: 0001729027
Company Name: Cliffs Mining Holding Sub Co
File Number: 333-223027-17
CIK: 0001729030
Company Name: Cliffs Mining Services Co
File Number: 333-223027-16
CIK: 0001729031
Company Name: Cliffs Minnesota Mining Co
File Number: 333-223027-15
CIK: 0001729032
Company Name: Cliffs Pickands Holding, LLC
File Number: 333-223027-14
CIK: 0001729035
Company Name: Cliffs TIOP Holding, LLC
File Number: 333-223027-13
CIK: 0001729033
Company Name: Cliffs TIOP, Inc.
File Number: 333-223027-12
CIK: 0001729043
Company Name: Cliffs TIOP II, LLC
File Number: 333-223027-11
CIK: 0001729044
Company Name: Cliffs UTAC Holding LLC
File Number: 333-223027-10
CIK: 0001729131
Company Name: Empire Iron Mining Partnership
File Number: 333-223027-09
CIK: 0001729132
Company Name: Lake Superior & Ishpeming Railroad Co
File Number: 333-223027-08
CIK: 0001729123
Company Name: Marquette Range Coal Service Co
File Number: 333-223027-07
CIK: 0001729119
Company Name: Northshore Mining Co
File Number: 333-223027-06
CIK: 0001729118
Company Name: Pickands Hibbing Corp
File Number: 333-223027-05
CIK: 0001729117
Company Name: Silver Bay Power Co
File Number: 333-223027-04
CIK: 0001729019
Company Name: Cleveland-Cliffs Iron Co
File Number: 333-223027-03
CIK: 0001729114
Company Name: Tilden Mining Co L.C.
File Number: 333-223027-02
CIK: 0001729113
Company Name: United Taconite LLC
File Number: 333-223027-01
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