Key Takeaway
Portable Unit #1 is a active surface mine producing Stone, located in Janesville, Rock County, WI. It has 136 violations on record (31 S&S) and $17K in proposed penalties. Operated by Bjoin Limestone Inc.
Portable Unit #1
Operator: Bjoin Limestone Inc
Controller: Kristopher P Bjoin; Shaun M Bjoin; Jonathan M Bjoin
Location: Janesville, Rock County, WI
Employees: 3
Recent Violations
View all 136 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 02/26/2026 | 56.14101(a)(2) | Non-S&S | ModNegligence | $0 |
| 02/26/2026 | 56.12008 | Non-S&S | ModNegligence | $0 |
| 06/04/2025 | 46.11(c) | Non-S&S | ModNegligence | $168 |
| 05/30/2025 | 56.15005 | Non-S&S | HighNegligence | $1,219 |
| 04/17/2024 | 47.44(b) | Non-S&S | ModNegligence | $147 |
| 04/18/2023 | 56.14107(a) | Non-S&S | ModNegligence | $143 |
| 04/18/2023 | 56.14100(c) | Non-S&S | ModNegligence | $143 |
| 06/15/2022 | 56.9300(a) | Non-S&S | ModNegligence | $133 |
| 04/28/2021 | 46.9(c)(2)(i) | Non-S&S | ModNegligence | $125 |
| 01/20/2021 | 56.11001 | S&S | ModNegligence | $125 |
| 01/20/2021 | 56.12028 | Non-S&S | LowNegligence | $125 |
| 01/20/2021 | 56.4201(a)(2) | Non-S&S | ModNegligence | $125 |
| 09/10/2019 | 56.4200(b)(2) | Non-S&S | ModNegligence | $121 |
| 09/10/2019 | 56.14101(a)(2) | Non-S&S | ModNegligence | $121 |
| 06/13/2018 | 56.4200(b)(2) | Non-S&S | ModNegligence | $118 |
| 06/13/2018 | 56.13010(a) | Non-S&S | LowNegligence | $118 |
| 04/19/2017 | 56.4101 | Non-S&S | ModNegligence | $135 |
| 04/19/2017 | 46.5(a) | S&S | ModNegligence | $312 |
| 04/19/2017 | 56.11002 | S&S | ModNegligence | $116 |
| 04/19/2017 | 56.9300(a) | S&S | ModNegligence | $116 |
Accidents & Injuries
View all 3 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 05/30/2025 | MACHINERY | DAYS AWAY FROM WORK ONLY | 1d lost |
| 05/10/2023 | POWERED HAULAGE | DAYS AWAY FROM WORK ONLY | 54d lost |
| 06/15/2007 | POWERED HAULAGE | DYS AWY FRM WRK & RESTRCTD ACT | 71d lost, 28d restricted |
Inspections
View all 63 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 02/26/2026 | 9.25 | 1 | |
| 06/04/2025 | 06/04/2025 | 8.25 | 1 |
| 04/15/2024 | 04/17/2024 | 8.25 | 1 |
| 04/18/2023 | 04/19/2023 | 9.50 | 1 |
| 06/13/2022 | 06/15/2022 | 9.75 | 1 |
| 05/31/2022 | 06/01/2022 | 6.75 | 1 |
| 03/21/2022 | 03/22/2022 | 14.00 | 1 |
| 04/28/2021 | 04/29/2021 | 9.00 | 1 |
| 01/19/2021 | 01/20/2021 | 14.00 | 1 |
| 09/03/2020 | 09/03/2020 | 6.25 | 1 |
Mine Details
Related Mines
Frequently Asked Questions
How many MSHA violations does Portable Unit #1 have?
Portable Unit #1 has 136 MSHA violations on record, of which 31 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $17K.
What type of mine is Portable Unit #1?
Portable Unit #1 is a Surface mine producing Stone, located in Janesville, Rock County, WI. It currently has 3 employees.
Has anyone been injured or killed at Portable Unit #1?
According to MSHA records, Portable Unit #1 has 3 reported accident/injury records and 0 fatalities on file.
Who operates Portable Unit #1?
Portable Unit #1 is operated by Bjoin Limestone Inc and controlled by Kristopher P Bjoin; Shaun M Bjoin; Jonathan M Bjoin. MSHA Mine ID: 4701111.