Darlington Mine Metal/Non-Metal
US Calcium LLC
· Surface
Controlled by
Halycon LLC; Sharp Resources LLC; Patten Resources LLC
Arco,
Custer County,
ID
·
Intermittent
MSHA Mine ID: 1002277
Darlington Mine has $10K in proposed MSHA penalties and $0 outstanding across 0 contested dockets, plus health sampling and the full incident record.
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- Fatalities
- 0
- Total incidents
- 0
- Years on record
- —
- Latest incident
- —
Compliance record
MSHA citations since 2017
47
citations
8
significant & substantial
$9,638
proposed penalties
$9,638
paid to date
100% of proposed penalties paid to date, a $0 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2017
36
inspections on record
448
inspection hours
n/a
citations per 100 inspection hours
ⓘ
This rate is recorded citations divided by MSHA inspection hours, per 100 hours. It reflects inspection effort, not mine size or production.Rate withheld: 448 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Darlington Mine has $10K in proposed MSHA penalties and $0 outstanding across 0 contested dockets.
Penalty disposition
ⓘ
Differences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.$10K
proposed penalties
$10K
current assessed
$10K
paid to date
$0
outstanding
47 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-01-12.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
See also
the operator's enforcement record
Quarterly safety rates
ⓘ
Citations per million reported employee-hours. Rates begin in 2000, when MSHA's quarterly employment data starts; earlier incidents are counted but cannot be rate-adjusted. Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.Citations per million employee-hours, as reported to MSHA
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2025 Q4 | 964 | 0 | 0 | 0.0 |
| 2025 Q3 | 50 | 0 | 0 | 0.0 |
| 2025 Q2 | 0 | 2 | 0 | |
| 2025 Q1 | 164 | 0 | 0 | 0.0 |
| 2024 Q4 | 0 | 1 | 0 | |
| 2024 Q3 | 154 | 0 | 0 | 0.0 |
| 2024 Q2 | 3,110 | 0 | 0 | 0.0 |
| 2024 Q1 | 2,277 | 4 | 0 | 1756.7 |
Show 29 earlier quarters Hide earlier quarters
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2023 Q4 | 3,225 | 0 | 0 | 0.0 |
| 2023 Q3 | 4,333 | 0 | 0 | 0.0 |
| 2023 Q2 | 3,982 | 4 | 0 | 1004.5 |
| 2023 Q1 | 2,967 | 1 | 0 | 337.0 |
| 2022 Q3 | 5,123 | 0 | 0 | 0.0 |
| 2022 Q2 | 0 | 0 | 0 | |
| 2022 Q1 | 1,866 | 2 | 1 | 1071.8 |
| 2021 Q4 | 5,813 | 0 | 0 | 0.0 |
| 2021 Q3 | 4,345 | 0 | 0 | 0.0 |
| 2021 Q2 | 3,120 | 0 | 0 | 0.0 |
| 2021 Q1 | 3,480 | 0 | 0 | 0.0 |
| 2020 Q4 | 3,279 | 4 | 0 | 1219.9 |
| 2020 Q3 | 4,098 | 6 | 2 | 1464.1 |
| 2020 Q2 | 4,112 | 3 | 0 | 729.6 |
| 2020 Q1 | 3,362 | 0 | 0 | 0.0 |
| 2019 Q4 | 2,054 | 0 | 0 | 0.0 |
| 2019 Q3 | 3,498 | 0 | 0 | 0.0 |
| 2019 Q2 | 4,135 | 4 | 1 | 967.4 |
| 2019 Q1 | 5,108 | 0 | 0 | 0.0 |
| 2018 Q4 | 4,178 | 3 | 0 | 718.0 |
| 2018 Q3 | 4,110 | 0 | 0 | 0.0 |
| 2018 Q2 | 3,217 | 3 | 1 | 932.5 |
| 2018 Q1 | 4,440 | 3 | 1 | 675.7 |
| 2017 Q4 | 3,428 | 2 | 1 | 583.4 |
| 2017 Q3 | 2,955 | 0 | 0 | 0.0 |
| 2017 Q2 | 2,355 | 3 | 1 | 1273.9 |
| 2017 Q1 | 4,358 | 0 | 0 | 0.0 |
| 2016 Q4 | 1,786 | 0 | 0 | 0.0 |
| 2016 Q3 | 1,932 | 0 | 0 | 0.0 |
No reportable incidents on file.
MSHA has no recorded reportable accidents for this mine in the current dataset. New reports appear here within a week of being filed.
For insurers, brokers, and safety consultants
The full compliance file on Darlington Mine
A dated report covering the 26-year penalty trail, line-item violation pattern, contest and docket posture, rate-normalized peer benchmark, and full fatality history. Delivered as a PDF with the underlying data as CSV.