Mining Incidents

Twin Underground Metal/Non-Metal

Nevada Gold Mines LLC · Underground
Golconda, Humboldt County, NV  ·  NonProducing
MSHA Mine ID: 2602693

Twin Underground has $270K in proposed MSHA penalties and $1K outstanding across 9 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
10
Years on record
2013–2026
Latest incident
Feb 2026
Compliance record
MSHA citations since 2011
131
citations
13
significant & substantial
$269,650
proposed penalties
$143,125
paid to date
53% of proposed penalties paid to date, a $126,525 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2011
77
inspections on record
1,645
inspection hours
8.0
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.
131 citations across 1,645 inspection hours.
Source: MSHA inspections data, updated weekly.

Twin Underground has $270K in proposed MSHA penalties and $1K outstanding across 9 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.
$270K
proposed penalties
$144K
current assessed
$143K
paid to date
$1K
outstanding
127 assessments are final orders; 9 contested dockets.
As of the most recent assessment on 2026-04-08.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
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 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
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
No fatalities recorded at this mine.

Reportable incidents

10 on file

2026 · 1 incident

February 9, 2026 NV · Metal/Non-Metal miner, nec HANDLING OF MATERIALS
Nevada Gold Mines LLC · Struck by... (Not Elsewhere Classified)

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.

2021 · 3 incidents

September 22, 2021 NV · Metal/Non-Metal miner, nec HANDLING OF MATERIALS
Nevada Gold Mines LLC · Fall onto or against objects

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.

June 15, 2021 NV · Metal/Non-Metal laborer, bull gang, faceman, parts runner, roustabout, roof trimmer/scaler SLIP OR FALL OF PERSON
Nevada Gold Mines LLC · Fall onto or against objects

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.

January 1, 2021 NV · Metal/Non-Metal FALL OF ROOF OR BACK
Nevada Gold Mines LLC · Accident type, without injuries

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

June 2, 2020 NV · Metal/Non-Metal miner, nec POWERED HAULAGE
Nevada Gold Mines LLC · Struck against a moving object

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.

April 24, 2020 NV · Metal/Non-Metal FALL OF ROOF OR BACK
Nevada Gold Mines LLC · Accident type, without injuries

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

January 28, 2019 NV · Metal/Non-Metal miner, nec POWERED HAULAGE
Newmont USA Limited · Struck against stationary object

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

October 11, 2017 NV · Metal/Non-Metal miner, nec FALL OF ROOF OR BACK
Newmont USA Limited · Struck by falling object

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

For insurers, brokers, and safety consultants

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.