Mining Incidents

Moss Mine: 129 MSHA citations Metal/Non-Metal

Golden Vertex Corp · Surface
Controlled by Mako Mining Corp
Bullhead City, Mohave County, AZ  ·  Active
MSHA Mine ID: 0202367

Moss Mine has $44K in proposed MSHA penalties and $755 outstanding across 4 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
22
Years on record
2013–2026
Latest incident
Jun 2026
Compliance record
MSHA citations since 2013
129
citations
27
significant & substantial
$43,821
proposed penalties
$37,877
paid to date
86% of proposed penalties paid to date, a $5,944 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2013
80
inspections on record
1,517
inspection hours
8.5
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.
129 citations across 1,517 inspection hours.
Source: MSHA inspections data, updated weekly.

Moss Mine has $44K in proposed MSHA penalties and $755 outstanding across 4 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.
$44K
proposed penalties
$39K
current assessed
$38K
paid to date
$755
outstanding
125 assessments are final orders; 4 contested dockets.
Of $28K in penalties contested before the Commission, $23K was upheld in final decisions.
As of the most recent assessment on 2026-01-28.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Violation severity profile
Shares are computed over citations that carry the MSHA gravity and negligence coding; a small share of records are uncoded.
21.1%
significant & substantial
11.7%
high negligence or reckless
21.1%
reasonably likely or greater
31.2%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 29.7% low, 58.6% moderate, 11.7% high, 0.0% reckless.
Source: MSHA violations gravity and negligence coding, updated weekly.
When citations were contested
Contesting a citation before the Federal Mine Safety and Health Review Commission is a lawful right. These figures state the public outcomes of that process, from MSHA's Contested Violations file.
2 citations taken to the federal commission · 2% of citations on record
  • Settled 1 · 50%
  • Stood as issued 1 · 50%
100%
S&S designation survived the contest
Counts a Significant & Substantial citation as surviving when a settlement or judge's decision kept the designation, or the contest was dismissed or defaulted so the citation stands as issued. Vacated and withdrawn citations, and settlements that removed the designation, count against.
of 1 decided S&S contests · industry: 79%
62%
Penalty reduction in decided contests
$8K proposed, $3K after decisions · industry: 39%
Source: MSHA Contested Violations file (public record), updated weekly. A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record. Latest contest filed 2025-08-06.
Contested penalties
A reduction or dismissal at the Commission is a lawful outcome of contesting a proposed penalty. Figures are the proposed amount and the amount upheld in the docket's decision.
Largest penalties this mine contested before the Federal Mine Safety and Health Review Commission, with the outcome on record.
Docket Decision Judge Year Proposed / upheld
WEST 2025-0308 Settlement Paez 2025 $10K → $10K
WEST 2025-0332 Settlement Simonton 2026 $10K → $10K
WEST 2021-0288 Settlement Miller 2022 $8K → $3K
WEST 2025-0342 Default 2025 $336 → $336
Source: FMSHRC civil penalty dockets and decisions (public record), updated weekly.
Health sampling
A sample is a point in time compliance measurement, not an individual exposure history. These figures describe MSHA sampling records and do not establish causation or personal dose.

Metal and nonmetal contaminants (personal samples)
Many samples are screening measurements of substances with no applicable exposure limit; they are counted as samples but excluded from every over-limit figure. Over-limit shares use only limit-tested samples.

Last sampled: 2026-07-14
24%
of limit-tested samples over the exposure limit
38
samples
25
limit-tested
Most sampled contaminants
  • Quartz, respirable, >1% Qtz266 over
  • Respirable dust, <.1mg8
  • Lead, inorganic dust3
  • Nuisance dust, respirable, <1% Qtz1
Show the individual readings (38)
Date Contaminant Concentration Limit Conc / limit Occupation
2026-07-14 Quartz, respirable, >1% Qtz 1.49 0.61 2.44 Cleanup Man
2025-06-05 Quartz, respirable, >1% Qtz 0.9 0.68 1.32 Crusher Oper/Worker
2023-10-24 Quartz, respirable, >1% Qtz 0.72 0.58 1.24 Utility Man
2023-07-04 Quartz, respirable, >1% Qtz 1.05 0.66 1.59 Cleanup Man
2023-07-04 Quartz, respirable, >1% Qtz 0.96 0.7 1.37 Cleanup Man
2022-07-07 Quartz, respirable, >1% Qtz 0.91 0.7 1.30 Crusher Oper/Worker
2025-10-28 Quartz, respirable, >1% Qtz 0.39 0.7 0.56 Crusher Oper/Worker
2025-10-28 Quartz, respirable, >1% Qtz 0.3 0.76 0.39 Crusher Oper/Worker
2025-07-22 Quartz, respirable, >1% Qtz 0.16 Crusher Oper/Worker
2025-07-22 Quartz, respirable, >1% Qtz 0.94 1.37 0.69 Crusher Oper/Worker
2025-06-05 Respirable dust, <.1mg 0 Crusher Oper/Worker
2025-03-27 Respirable dust, <.1mg 0 Utility Man
2025-03-27 Quartz, respirable, >1% Qtz 0.13 Utility Man
2024-04-28 Quartz, respirable, >1% Qtz 0.28 0.64 0.44 Utility Man
2024-04-28 Quartz, respirable, >1% Qtz 0.31 0.64 0.48 Cleanup Man
2024-04-28 Quartz, respirable, >1% Qtz 0.45 0.64 0.70 Cleanup Man
2023-11-21 Respirable dust, <.1mg 0 Utility Man
2023-11-21 Nuisance dust, respirable, <1% Qtz 0.14 10 0.01 Utility Man
2023-11-21 Quartz, respirable, >1% Qtz 0.14 Utility Man
2023-10-24 Quartz, respirable, >1% Qtz 0.19 1.01 0.19 Electrician
2023-10-24 Quartz, respirable, >1% Qtz 0.29 0.67 0.43 Utility Man
2023-07-13 Respirable dust, <.1mg 0 Truck Driver
2023-04-26 Quartz, respirable, >1% Qtz 0.72 1.85 0.39 Mobile Crane Operator
2023-04-26 Quartz, respirable, >1% Qtz 0.48 0.7 0.69 Laborer, Bullgang
2022-09-28 Quartz, respirable, >1% Qtz 0.48 0.59 0.81 Welder, etc.
2022-09-28 Quartz, respirable, >1% Qtz 0.38 Mechanic
2022-09-28 Quartz, respirable, >1% Qtz 2.54 2.94 0.86 Mechanic
2022-07-07 Quartz, respirable, >1% Qtz 0.42 0.98 0.43 Sampler, Dust
2019-09-04 Respirable dust, <.1mg 0 Truck Driver
2019-09-04 Quartz, respirable, >1% Qtz 0.43 Shovel Operator
2019-09-04 Respirable dust, <.1mg 0 Bulldozer Operator
2019-09-04 Quartz, respirable, >1% Qtz 0.3 0.61 0.49 Drill Operator, Rotary
2018-08-21 Lead, inorganic dust 0 150 0.00 Lab Technician
2018-08-21 Lead, inorganic dust 0 150 0.00 Lab Technician
2018-08-21 Lead, inorganic dust 16.42 150 0.11 Lab Technician
2018-04-30 Quartz, respirable, >1% Qtz 0.25 0.76 0.33 Lab Technician
2018-04-30 Respirable dust, <.1mg 0 Supervisor, Co. Official
2017-01-18 Respirable dust, <.1mg 0 Electrician
Source: MSHA respirable dust, quartz, and noise sampling records, updated weekly. Metal/nonmetal contaminant figures come from MSHA's Personal Health Samples and Area Samples files (public record), updated weekly.

Moss Mine recorded 0.00 reportable injury cases per 100 full-time workers in 2025.

Injury rate, 2025
This rate is reportable injury cases per 100 full-time-equivalent workers per year, computed as 200,000 times cases divided by MSHA operator-reported employee-hours. Cases are injuries MSHA graded degree 01 through 07; accident-only events that hurt no one are excluded, and so are contractor injuries, whose hours do not attach to a single mine. Rates begin in 2000, when quarterly employment reporting starts, and are withheld below 20,000 hours in a year.
0.00
total case rate
0.00
days-away rate
0.000
fatality rate
Below average. The US metal and nonmetal mining average was 1.65 and the all-US-mining average was 1.97 cases per 100 workers.
In Arizona, metal and nonmetal mining averaged 1.81 cases per 100 workers that year.
Year total case rate days-away fatal
2025 0.00 0.00 0.000
2024 0.00 0.00 0.000
2023 0.91 0.00 0.000
2022 1.36 1.36 0.000
2021 0.00 0.00 0.000
2020 0.00 0.00 0.000
2019 1.14 1.14 0.000
2018 1.33 0.00 0.000
Source: injury cases from MSHA accident and injury records; employee-hours from MSHA quarterly employment reports. Rate is cases per 100 full-time-equivalent workers, operator employees only.
Ownership history
  1. Harrison Mining 1987 to 2013
  2. Golden Vertex Corp 2013 to present
  3. Golden Vertex LLC 2025 to 2025
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 88
2025 69
2024 78
2023 104
2022 64
2021 97
2020 83
2019 80
2018 64
2017 20
2016 4
2014 15
2013 19
Source: MSHA quarterly employment and production, updated weekly.

Moss Mine sits in Mohave County, Arizona, where the Census mining category is 0.7% of county employment.

Local economic context
County figures come from the US Census Bureau's American Community Survey, 5-year pooled estimates, so the 2023 vintage covers 2019 through 2023. The Census category is 'mining, quarrying, and oil and gas extraction', which is broader than MSHA jurisdiction and includes oil and gas workers no mine employs. These figures describe the surrounding county, not this mine, and are not a factor in any specific incident.
Mohave County, Arizona · Population 217,420
0.7%
Mining share of county employment
$55,799
Median household income
Source: US Census Bureau, American Community Survey 2023 5-year estimates.
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
2026 Q2 37,386 0 0 0.0
2026 Q1 43,630 1 0 22.9
2025 Q4 37,270 6 1 161.0
2025 Q3 34,762 0 0 0.0
2025 Q2 22,526 2 0 88.8
2025 Q1 15,928 7 1 439.5
2024 Q4 11,787 2 0 169.7
2024 Q3 33,866 0 0 0.0
Show 38 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 41,854 10 3 238.9
2024 Q1 41,814 0 0 0.0
2023 Q4 62,051 5 2 80.6
2023 Q3 45,944 5 1 108.8
2023 Q2 71,193 8 4 112.4
2023 Q1 39,438 0 0 0.0
2022 Q4 47,853 4 0 83.6
2022 Q3 41,404 2 0 48.3
2022 Q2 20,473 0 0 0.0
2022 Q1 37,078 0 0 0.0
2021 Q4 80,073 0 0 0.0
2021 Q3 43,388 0 0 0.0
2021 Q2 37,079 2 0 53.9
2021 Q1 46,221 0 0 0.0
2020 Q4 51,074 0 0 0.0
2020 Q3 33,615 1 0 29.7
2020 Q2 40,556 5 0 123.3
2020 Q1 41,677 4 2 96.0
2019 Q4 47,699 3 0 62.9
2019 Q3 40,528 2 1 49.3
2019 Q2 44,996 0 0 0.0
2019 Q1 41,791 0 0 0.0
2018 Q4 47,439 0 0 0.0
2018 Q3 45,565 2 2 43.9
2018 Q2 32,619 0 0 0.0
2018 Q1 24,960 0 0 0.0
2017 Q4 13,718 1 0 72.9
2017 Q3 7,040 0 0 0.0
2017 Q2 4,422 0 0 0.0
2017 Q1 2,608 2 0 766.9
2016 Q4 1,820 0 0 0.0
2014 Q4 6,991 0 0 0.0
2014 Q3 8,414 1 0 118.8
2014 Q2 8,647 0 0 0.0
2014 Q1 10,723 1 0 93.3
2013 Q4 13,434 0 0 0.0
2013 Q3 11,798 0 0 0.0
2013 Q2 3,992 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

22 on file

2026 · 2 incidents

June 28, 2026 AZ · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Golden Vertex Corp · Struck by flying object

While inspecting equipment at the crusher a foreign object entered left eye. Taken to ER and material was removed.

May 21, 2026 AZ · Metal/Non-Metal outside foreman, leadman ELECTRICAL
Golden Vertex Corp · Flash burns (electric)

EE was troubleshooting a motor on the autosampler. While attempting to actuate the brake, wires arced, causing an arc flash.

2025 · 2 incidents

November 17, 2025 AZ · Metal/Non-Metal master mechanic, foreman, supervisor HANDTOOLS (NONPOWERED)
Golden Vertex Corp · Struck by flying object

Employee was attempting to remove an old tooth from a 988K CAT loader. Employee struck the tooth of the 988K with a hammer causing a sliver of metal to enter the employee's leg.

November 17, 2025 AZ · Metal/Non-Metal master mechanic, foreman, supervisor HANDTOOLS (NONPOWERED)
Golden Vertex Corp · Struck by flying object

Employee was attempting to remove an old tooth from a 988K CAT loader. Employee struck the tooth of the 988K with a hammer causing a sliver of metal to enter the employee's leg.

2024 · 2 incidents

April 8, 2024 AZ · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator POWERED HAULAGE
Golden Vertex Corp · Struck against a moving object

A loader operator was loading waste in the pit, when the bucket contacted a hard toe in the dig face that jarred the loader and the operator's back. The operator was taken to the hospital for evaluation and was diagnosed with trauma to their lumbar region.

March 29, 2024 AZ · Metal/Non-Metal greaser, grease man, oiler, lube man, dragline oiler SLIP OR FALL OF PERSON
Golden Vertex Corp · Over-exertion (Not Elsewhere Classified)

A fuel and lube technician was dismounting a dozer. They were using 3-points of contact and as they placed their right foot on the ground, they felt a pain in their right knee and their knee gave out. The ground conditions were good.

2023 · 1 incident

July 15, 2023 AZ · Metal/Non-Metal crusher attendant/operator, pan feeder operator/worker HANDLING OF MATERIALS
Golden Vertex Corp · Struck by... (Not Elsewhere Classified)

Employee was working between cones one and two on the ground level on the ladder for CV1 zero speed on the belt. As EE was dismounting the ladder, EE snagged EE's harness on a Unistrut and continued down the ladder unaware EE has sustained a laceration.

2022 · 2 incidents

June 29, 2022 AZ · Metal/Non-Metal blaster, shooter, shotfirer, explosive worker, powder gang/monkey HANDTOOLS (NONPOWERED)
Golden Vertex Corp · Struck by... (Not Elsewhere Classified)

Employee was using a utility knife to cut a heavy hose. EE was cutting away from EE's body when the knife slipped and caught EE's right thumb. The laceration resulted in stitches.

June 1, 2022 AZ · Metal/Non-Metal assayer, geologist, metallurgist, engineer, engineer management SLIP OR FALL OF PERSON
Golden Vertex Corp · Fall onto or against objects

EE fell while staking out ore control on rocks. EE slightly scratched lower left leg from the rock. EE stated when EE reported the incident to mine personnel on 6/22/22 that the scratch did not break the skin & EE didn't perform first-aid to clean wound. Miner sought medical treatment on 6/22/22 where EE was treated for a staph infection & MRSA. Miner is back to full duty as of 7/1

2020 · 3 incidents

July 30, 2020 AZ · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer SLIP OR FALL OF PERSON
Golden Vertex Corp · Fall onto or against objects

Employee was raising mast on light plant when the cable broke inside the mast itself and employee jumped out of the way, banging left shin on the outrigger of the light plant causing a 1 inch laceration requiring one staple to close.

July 11, 2020 AZ · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
Golden Vertex Corp · Struck by flying object

Employee was replacing a ripper tooth on a dozer and while striking the tooth to loosen it, a shard came off and entered EE's left leg just below the knee. It severed a vein and it required medical treatment to repair it.

May 15, 2020 AZ · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Golden Vertex Corp · Struck by falling object

Employee dropped a heel plate onto tip of right ring finger crushing the distal joint tissue.

2019 · 6 incidents

October 31, 2019 AZ · Metal/Non-Metal drill operator SLIP OR FALL OF PERSON
Golden Vertex Corp · Fall onto or against objects

While entering the drill cab from the drill deck Employee slipped on the deck and landed on the door jam with their chest. Employee fractured #11 rib and was placed on modified duty.

September 17, 2019 AZ · Metal/Non-Metal crusher attendant/operator, pan feeder operator/worker HANDLING OF MATERIALS
Golden Vertex Corp · Caught in, under or between a moving and a stationary object

After locking out the CV7 grasshopper. Employee climbed into the tail pulley area to start cleaning out the dirt. when there was a shift in the material and their leg got caught in a pinch point.

August 20, 2019 AZ · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
Golden Vertex Corp · Caught in, under or between running or meshing objects

Mechanic was grinding off a stripped bolt when grinder jumped and struck left wrist causing a 1 - 1 1/2 inch cut which required sutures to close.

June 20, 2019 AZ · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer SLIP OR FALL OF PERSON
Golden Vertex Corp · Fall from machine

Employee slipped while dismounting a 10-wheel water truck and fell to ground fracturing a bone in EE's right wrist.

June 5, 2019 AZ · Metal/Non-Metal greaser, grease man, oiler, lube man, dragline oiler DISORDERS (PHYSICAL AGENTS)
Golden Vertex Corp · Contact with heat

First hot day of season, an Oiler was changing filters on truck when they started feeling dizzy. Seen at ER where they were given 2 bags IV fluid for dehydration and released.

March 22, 2019 AZ · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver HANDLING OF MATERIALS
Golden Vertex Corp · Over-exertion in lifting objects

Truck driver strained back muscle while rolling rock out of the way.

2018 · 3 incidents

November 6, 2018 AZ · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver HANDLING OF MATERIALS
Golden Vertex Corp · Over-exertion (Not Elsewhere Classified)

Employee was working on a blast pattern loading holes with 50 lb. bagged ANFO. Employee reported feeling like EE had thrown back out and upon subsequent medical evaluation, it was discovered EE had a mild compression fracture of the T-12 vertebrae.

August 7, 2018 AZ · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
Golden Vertex Corp · Caught in, under or between a moving and a stationary object

Technician had unloaded engine with service truck crane and placed it on the ground. Was disconnecting hooks from engine. Had left hand on lifting hook and needed to reduce tension to release hook. Meant to push the hoist down button on crane control but hit the boom out increasing hook tension, pinching finger.

April 10, 2018 AZ · Metal/Non-Metal leaching operator HANDTOOLS (NONPOWERED)
Golden Vertex Corp · Struck by... (Not Elsewhere Classified)

Worker was cutting the banding off the drip hose when the knife slipped and cut left forearm.

2013 · 1 incident

July 25, 2013 AZ · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman OTHER
Golden Vertex Corp · Unclassified, insufficient data

Experienced muscle cramps, vomiting, dehydration No loss of consciousness. Taking lisinopril for high blood pressure.