MESABI TRUST

DESCRIPTION OF THE MINERAL PROPERTIES AND NORTHSHORE’S MINING OPERATIONS

Mine and Rock Formation. The Trust Estate, including the ore mine, are located in northeastern Minnesota, approximately two miles south of Babbitt, Minnesota. The ore mine on the Trust Estate is called the Peter Mitchell Mine, an open pit mine consisting of a 10-mile long segment of a host rock called the Biwabik Iron Formation, which is a very hard cherty rock containing magnetite as the ore mineral. The Biwabik Iron Formation extends west and southwest for over 100 miles and constitutes the Mesabi Iron Range. Recoverable iron grades range from 21% magnetic iron in the west end of the mine open pit to 26% magnetic iron in the central portion and east end. The ore body dips south under the hanging wall called the Virginia Formation. To date, the Mesabi Trust properties have been explored for their iron ore potential. To the knowledge of the Mesabi Trustees, no other minerals have been explored on the Trust Estate.

Mining Properties. As disclosed elsewhere in this Annual Report, Northshore, a wholly-owned subsidiary of Cliffs, currently conducts the mining operation upon the Trust Estate. The main entrance to the Northshore mine is accessed by means of a gravel road and is located off County Road 70. Northshore’s processing facilities are located in Silver Bay, Minnesota, near Lake Superior, on U.S. Highway 61. Each year, the Trustees visit the Northshore mine in Babbitt, Minnesota and the processing plant in Silver Bay, Minnesota. During such visits, the Trustees inspect the condition of the mining properties as well as mining equipment and facilities. Based on information provided to the Trustees during the most recent inspection trip in September 2022, the mining properties and facilities at Northshore were in good operating condition.

Northshore’s Operations. Because Mesabi Trust is not involved in Northshore’s mining operations, the Trustees do not have detailed firsthand information relating to such operations or the equipment and facilities used by Northshore. Therefore, the Trustees rely on information provided by Cliffs’ and Northshore’s personnel, disclosures by Cliffs in its periodic and current reports filed with the SEC and, to some extent, information provided in other reports published by independent organizations, in providing the information relating to Northshore’s mining operations, equipment and facilities.

During the concentrating process, ore concentrate is separated by a two-stage magnetic separation, which removes low grade tailings from the ore concentrate. The tailings are pumped uphill to the Mile Post 7 disposal site. The concentrate is then fed into hydro-separators followed by a final flotation upgrading accomplished with two flotation cells per grinding line. Next, the concentrate proceeds to a central filtering facility, through which the moisture content in the concentrate is reduced and the final concentrate becomes ready for pelletizing. The pelletizing process first feeds the ore concentrate, to which bentonite and organic binder has been added as a

binder, into a balling drum. The revolving action of the drum causes the concentrate to build up into green balls. Next, the green balls are conveyed to moving grates and enter into an accompanying high temperature furnace where they are heated to over 2,400°F and are hardened into the final pellet product. From the furnaces the pellets are conveyed to a dockside storage area. Northshore’s sheltered harbor at Silver Bay can handle lake-going vessels.

Further, as disclosed in Cliffs’ Annual Report, from 2017 to 2021, Cliffs invested approximately $1 billion into its Toledo direct reduction plant, which provides a low carbon intensity raw material to Cliffs’ steelmaking operations. The HBI produced from the plant requires less energy to produce compared to traditional feedstock and can be used in blast furnaces to reduce emissions by improving energy efficiency and reducing the amount of coke required for steel production.

Under the Dodd-Frank Act, each operator of a coal or other mine is required to include certain mine safety results within its periodic reports filed with the SEC. As required by the reporting requirements included in §1503(a) of the Dodd-Frank Act, in Cliffs’ Annual Report, Cliffs presented the following items regarding certain mining safety and health matters for the Northshore Mine.

In Cliffs’ Annual Report, Cliffs reported that the Northshore mine did not receive any flagrant violations under Section 110(b)(2) of the FMSH Act (30 U.S.C. 820(b)(2)) and did not receive any written notices of a pattern of violations, or the potential to have a pattern of such violations, under section 104(e) of the FMSH Act (30 U.S.C. 814(e)) during the year ended December 31, 2023. In addition, according to Cliffs there were no mining-related fatalities at the Northshore mine during the same period.

Following is a summary of the information listed above with respect to Northshore for the year ended December 31, 2023.