---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-093889"
form_type: "8-K"
ticker: "MSB"
cik: "0000065172"
company_name: "MESABI TRUST"
filed_at: "2025-09-26T23:59:59+00:00"
generated_at: "2026-05-17T05:37:46.919576+00:00"
event_type: "litigation"
sentiment: "negative"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Mesabi Trust initiates arbitration against Cleveland-Cliffs over idling and royalty underpayments

## Summary
- Arbitration filed Sept 26, 2025 via American Arbitration Association against Northshore Mining and Cleveland-Cliffs.
- Claims relate to idling of Northshore operations from May 2022 to April 2023.
- Also claims underpayment of royalties on intercompany shipments from 2023 to present.
- Seeks damages and declaratory relief for alleged breaches of lease/operating agreement.

## SEC filing metadata
- accession: 0001104659-25-093889
- form_type: 8-K
- ticker: MSB
- cik: 0000065172
- company_name: MESABI TRUST
- filed_at: 2025-09-26T23:59:59+00:00
- event_type: litigation
- sentiment: negative
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/65172/000110465925093889/0001104659-25-093889-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/65172/000110465925093889/msb-20250926x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-093889
- JSON: https://secwatch.observer/filing/0001104659-25-093889.json
- Plain text: https://secwatch.observer/filing/0001104659-25-093889.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.