Miners were attempting to remove an old pump discharge pipe. The upstream valve had been isolated. While loosening the 4-inch Victaulic fitting, the pipe separated due to tension within the line, causing one of the pipes to swing toward the employee, striking EE in the right lower chest.
Twin Underground Metal/Non-Metal
Twin Underground has $270K in proposed MSHA penalties and $1K outstanding across 9 contested dockets, plus health sampling and the full incident record.
Watch this mine
Email me when a new MSHA incident is filed at Twin Underground.
- Fatalities
- 0
- Total incidents
- 10
- Years on record
- 2013–2026
- Latest incident
- Feb 2026
ⓘ
This rate is recorded citations divided by MSHA inspection hours, per 100 hours. It reflects inspection effort, not mine size or production.Twin Underground has $270K in proposed MSHA penalties and $1K outstanding across 9 contested dockets.
ⓘ
Differences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.ⓘ
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.| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2025 Q4 | 1,273 | 2 | 0 | 1571.1 |
| 2025 Q3 | 889 | 2 | 0 | 2249.7 |
| 2025 Q2 | 1,054 | 1 | 0 | 948.8 |
| 2025 Q1 | 990 | 0 | 0 | 0.0 |
| 2024 Q4 | 1,295 | 2 | 0 | 1544.4 |
| 2024 Q3 | 4,318 | 0 | 0 | 0.0 |
| 2024 Q2 | 4,838 | 2 | 0 | 413.4 |
| 2024 Q1 | 6,940 | 2 | 1 | 288.2 |
Show 47 earlier quarters Hide earlier quarters
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2023 Q4 | 12,928 | 9 | 1 | 696.2 |
| 2023 Q3 | 16,714 | 2 | 0 | 119.7 |
| 2023 Q2 | 16,719 | 1 | 0 | 59.8 |
| 2023 Q1 | 14,273 | 2 | 0 | 140.1 |
| 2022 Q4 | 13,186 | 0 | 0 | 0.0 |
| 2022 Q3 | 12,851 | 4 | 0 | 311.3 |
| 2022 Q2 | 12,318 | 1 | 0 | 81.2 |
| 2022 Q1 | 10,645 | 6 | 3 | 563.6 |
| 2021 Q4 | 10,946 | 6 | 1 | 548.1 |
| 2021 Q3 | 9,304 | 9 | 2 | 967.3 |
| 2021 Q2 | 8,736 | 5 | 0 | 572.3 |
| 2021 Q1 | 7,817 | 5 | 0 | 639.6 |
| 2020 Q4 | 9,233 | 1 | 0 | 108.3 |
| 2020 Q3 | 8,386 | 5 | 1 | 596.2 |
| 2020 Q2 | 11,928 | 1 | 0 | 83.8 |
| 2020 Q1 | 6,763 | 8 | 0 | 1182.9 |
| 2019 Q4 | 12,274 | 0 | 0 | 0.0 |
| 2019 Q3 | 12,586 | 5 | 0 | 397.3 |
| 2019 Q2 | 13,640 | 3 | 0 | 219.9 |
| 2019 Q1 | 13,588 | 2 | 0 | 147.2 |
| 2018 Q4 | 15,144 | 4 | 0 | 264.1 |
| 2018 Q3 | 14,427 | 0 | 0 | 0.0 |
| 2018 Q2 | 13,269 | 3 | 0 | 226.1 |
| 2018 Q1 | 14,873 | 2 | 0 | 134.5 |
| 2017 Q4 | 12,859 | 2 | 0 | 155.5 |
| 2017 Q3 | 10,894 | 0 | 0 | 0.0 |
| 2017 Q2 | 1,720 | 1 | 0 | 581.4 |
| 2017 Q1 | 1,570 | 0 | 0 | 0.0 |
| 2016 Q4 | 1,969 | 0 | 0 | 0.0 |
| 2016 Q3 | 2,691 | 3 | 0 | 1114.8 |
| 2016 Q2 | 2,705 | 3 | 0 | 1109.1 |
| 2016 Q1 | 2,812 | 6 | 2 | 2133.7 |
| 2014 Q4 | 20 | 0 | 0 | 0.0 |
| 2014 Q3 | 52 | 0 | 0 | 0.0 |
| 2014 Q2 | 52 | 1 | 0 | 19230.8 |
| 2014 Q1 | 52 | 1 | 0 | 19230.8 |
| 2013 Q4 | 366 | 1 | 0 | 2732.2 |
| 2013 Q3 | 1,970 | 0 | 0 | 0.0 |
| 2013 Q2 | 2,619 | 3 | 2 | 1145.5 |
| 2013 Q1 | 5,479 | 4 | 0 | 730.1 |
| 2012 Q4 | 4,680 | 4 | 0 | 854.7 |
| 2012 Q3 | 4,680 | 0 | 0 | 0.0 |
| 2012 Q2 | 4,680 | 0 | 0 | 0.0 |
| 2012 Q1 | 3,120 | 0 | 0 | 0.0 |
| 2011 Q3 | 371 | 0 | 0 | 0.0 |
| 2011 Q2 | 8,522 | 2 | 0 | 234.7 |
| 2011 Q1 | 2,996 | 0 | 0 | 0.0 |
Reportable incidents
10 on file2026 · 1 incident
2021 · 3 incidents
Employee was changing out steel on a bolter when they lost footing and fell back. Employee denied medical attention initially. November they requested to see a doctor, employee was taken to an urgent care and referred to a specialist. Employee was put on RD by the specialist pending surgery.
Employee lost consciousness due to a medical incident not related to work. EE fell forward and struck EE's face on a bolt plate causing a laceration to EE's cheek.
A ground fall occurred post blast at Vista Underground-Turquoise Ridge at the 1N3960 level. No ventilation or access was restricted. No injuries sustained.
2020 · 2 incidents
Employee was driving down the decline. The employee passed another operator and applied the engine break through the turn and the front left bed corner struck the pillar rib of the muckbay causing the employees face to make contact with the truck radio resulting in a laceration on right cheek and nostril.
On April 24 a back shot was taken on 112 stope. Upon inspection it was noticed that the back had broken past the designed stope towards the access. SMD notified the Vista Underground engineering team. Chief Engineer Ben Gunn inspected the site and determined the rock had broken beyond primary ground support and MSHA was notified.
2019 · 1 incident
Employee was riding in the back of a tractor. The tractor hit a hole and the employee bounced up and back down striking the bottom of their foot on a hose that was on the floor. Their foot flexed up against the metatarsal boot causing a fracture.
2017 · 1 incident
Miner had a piece of rock come off approximately 6ft from the r- rib hitting the right tip of EE's middle finger. The injury resulted in 5 stitches at the end of EE's finger.
2013 · 2 incidents
Loading face round when a rock fell from face hit employee ankle.
Rock fell out of face hitting employee.
The full compliance file on Twin Underground
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.