MESABI TRUST

LEASEHOLD ROYALTIES

Northshore is obligated to pay to Mesabi Trust base overriding royalties and royalty bonuses on all pellets (and other iron ore products) produced from the Peters Lease Lands and the Cloquet Lease Lands (“Mesabi Ore”) and shipped from Silver Bay in each calendar year. The royalties are based on prices per unit of product, volumes of product shipped and where on the escalating scale of royalties—2-1/2% on the first million long tons to 6% on shipments above four million long tons per calendar year—each shipment falls.

Base overriding royalties. Base overriding royalties are calculated on the basis of an escalating scale of percentages of gross sales proceeds of iron ore shipped. The applicable percentage is determined by reference to the tonnage of pellets (and other iron ore products) previously shipped in the then current calendar year, as follows:

Royalty bonuses. Royalty bonuses are payable on all iron ore products produced from Mesabi Ore shipped from Silver Bay during a calendar quarter and sold at prices above the Adjusted Threshold Price. The Adjusted Threshold Price was $67.75 for calendar year 2024, $69.41 for calendar year 2025, and is $71.70 for calendar year 2026. The Adjusted Threshold Price is subject to adjustment (but not below $30 per ton) for inflation and deflation and is determined each year on the basis of the change in the Gross Domestic Product Implicit Price Deflator, a broad-based index of inflation and deflation published quarterly by the U.S. Department of Commerce.

The amount of royalty bonuses payable for any calendar quarter is calculated on the basis of an escalating scale of percentages of the gross sales proceeds to Northshore of pellets produced from Mesabi Ore that are sold at prices above the Adjusted Threshold Price. The applicable percentage is determined by reference to the amount by which the sales prices for a particular quantity of pellets exceeds the Adjusted Threshold Price, as follows:

Leasehold royalty example. To illustrate the calculation of base overriding royalties and royalty bonuses, assume that no shipments of iron ore products were made during the first calendar quarter of 2026, and further assume that pellets were shipped from Silver Bay in the second and third calendar quarters of 2026 in the following tonnage quantities and rendering the following gross proceeds:

In this example, the base overriding royalties payable in respect of the second and third calendar quarters of 2026 would be as follows:

Based on the same example, the base overriding royalty percentage applicable for all iron ore products shipped in the fourth calendar quarter of 2026 would be 6%, because more than four million tons were shipped during the first three quarters.

Further, the royalty bonuses payable in respect of the second and third calendar quarters of 2026 would be as follows (with reference to the Adjusted Threshold Price (“ATP”) of $71.70).

The above figures are provided only to illustrate the method for calculating base overriding royalties and royalty bonuses and do not indicate the amount of base overriding royalties or royalty bonuses the Trustees expect Mesabi Trust to earn in calendar 2026 or any other calendar or fiscal year. Accordingly, the foregoing example illustrating the calculation of base overriding royalties and royalty bonuses should not be considered a prediction of the amount of base overriding royalties or royalty bonuses Mesabi Trust will receive.

Bonuses on other ore. Northshore also must pay base overriding royalties and royalty bonuses on pellets produced from lands other than Mesabi Trust Lands (“Other Ore”) to the extent necessary to assure payment of base overriding royalties and royalty bonuses on at least 90% of the first four million tons of pellets shipped from Silver Bay in each calendar year, at least 85% of the next two million tons of pellets shipped therefrom in each calendar year, and at least 25% of all tonnage of pellets shipped therefrom in each calendar year in excess of six million tons. Base overriding royalties and royalty bonuses payable on Other Ore can be recouped by Northshore out of base overriding royalties and royalty bonuses paid on Mesabi Ore. The amount of base overriding royalties and royalty bonuses on Other Ore that can be recouped on any payment date cannot, however, exceed 20% of the amount of Mesabi Ore royalties and royalty bonuses which are otherwise payable on that payment date.

Advance royalties. Northshore is obligated to pay Mesabi Trust advance royalties in equal quarterly installments. The advance royalty was $1,157,261 for calendar year 2025 and is $1,195,452 for calendar year 2026. The amount of advance royalties payable is subject to adjustment (but not below $500,000 per annum) for inflation and deflation and is determined each year in the same manner as the Adjusted Threshold Price. All payments of advance royalties are credited against payments of base overriding royalties and royalty bonuses payable on Mesabi Ore until fully recouped by Northshore. The amount of advance royalties payable in respect of each calendar quarter constitutes the minimum overriding royalty amount payable by Northshore in respect of that calendar quarter.

Other leasehold royalty information. Base overriding royalties and royalty bonuses are payable quarterly and accrue upon shipment, whether or not the actual sales proceeds for any shipment are received by Northshore. The amount of base overriding royalties and royalty bonuses payable with respect to the first three quarters in any calendar year are determined on the basis of tonnage shipped during each such calendar quarter and the actual sales proceeds of such shipments, with an adjustment made to the royalties payable with respect to the last quarter in any calendar year to account for adjustments.