Item 1.04 Mine Safety - Reporting of Shutdowns and Patterns of Violations.
On September 16, 2020, Knife River Corporation - Mountain West, an indirect
subsidiary of MDU Resources Group, Inc., received an imminent danger order
issued by the Mine Safety and Health Administration under section 107(a) of the
Federal Mine Safety and Health Act of 1977. The imminent danger order was
issued at the Amyx pit in Ada County, Idaho upon observation of extremely dusty
conditions resulting from the company's rock crusher and adjacent haul road.
The water spray dust suppression system on the rock crusher was broken and the
company's water trucks to suppress dust on the haul road were assigned to an
alternate location. The company repaired the water spray dust suppression
system on the rock crusher and watered the road, thereby terminating the order.
Item 9.01. Financial Statements and Exhibits.
(d) Exhibits. The following exhibits are being furnished as part of this
report.
Exhibit Number Description
104 Cover Page Interactive Data File (embedded within the Inline XBRL
document)
2
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