PORTABLE UNIT #4 Metal/Non-Metal
BJOIN LIMESTONE INC.
· Surface
Controlled by
Kristopher P Bjoin; Shaun M Bjoin; Jonathan M Bjoin
JANESVILLE,
Rock County,
WI
·
Active
MSHA Mine ID: 4703709
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Email me when a new MSHA incident is filed at PORTABLE UNIT #4.
- Fatalities
- 0
- Total incidents
- 0
- Years on record
- —
- Latest incident
- —
Compliance record
MSHA citations since 2014
14
citations
2
significant & substantial
$1,782
proposed penalties
$1,782
paid to date
Source: MSHA violations data, updated weekly.
Quarterly safety rates
Citations per million employee-hours, as reported to MSHA
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2025 Q4 | 1,123 | 0 | 0 | 0.0 |
| 2025 Q3 | 1,572 | 0 | 0 | 0.0 |
| 2025 Q2 | 1,498 | 0 | 0 | 0.0 |
| 2025 Q1 | 1,316 | 0 | 0 | 0.0 |
| 2024 Q4 | 1,182 | 0 | 0 | 0.0 |
| 2024 Q3 | 1,437 | 0 | 0 | 0.0 |
| 2024 Q2 | 1,192 | 0 | 0 | 0.0 |
| 2024 Q1 | 822 | 0 | 0 | 0.0 |
Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
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.