PORTABLE PLANT # 9 Metal/Non-Metal

STRATA CORPORATION · Surface

Controlled by Knife River Corporation

Fairview, Richland County, MT · Temporarily Idled

MSHA Mine ID: 3200990

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Compliance record

MSHA citations since 2017

citations

significant & substantial

$2,259

proposed penalties

$2,259

paid to date

Source: MSHA violations data, updated weekly.

Quarterly safety rates

Citations per million employee-hours, as reported to MSHA

Quarter	Hours worked	Per 1M hrs
2025 Q4	0
2025 Q3	0
2025 Q2	313	0.0
2025 Q1	0
2024 Q4	188	0.0
2024 Q3	622	0.0
2023 Q4	2,292	0.0
2023 Q3	3,493	0.0

Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.

No fatalities recorded at this mine.

1 on file

April 14, 2017 MT · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer SLIP OR FALL OF PERSON

STRATA CORPORATION · Over-exertion (Not Elsewhere Classified)

Employee slipped on a hill and strained left calf muscle.