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.
210 citations across 1,549 inspection hours.
Source: MSHA inspections data, updated weekly.
Rialto has $73K in proposed MSHA penalties and $0 outstanding across 2 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.
$73K
proposed penalties
$71K
current assessed
$71K
paid to date
$0
outstanding
209 assessments are final orders; 2 contested dockets.
Of $7K in penalties contested before the Commission, $5K was upheld in final decisions.
As of the most recent assessment on 2025-09-08.
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.
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.
3citations taken to the federal commission · 1% of citations on record
Settled
3 · 100%
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 Vacated and withdrawn citations, and settlements that removed the designation, count against.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 2 decided S&S contests · industry: 79%
34%
Penalty reduction in decided contests
$7K proposed, $5K 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 A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record.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 2009-08-24.
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.
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: 2023-10-04
0%
of limit-tested samples over the exposure limit
25
samples
17
limit-tested
Most sampled contaminants
Quartz, respirable, >1% Qtz17
Respirable dust, <.1mg6
Unlisted Particulate, respirable, <1% Qtz2
Show the individual readings (25)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2023-10-04
Respirable dust, <.1mg
0
Front-end Loader Operator
2020-11-13
Respirable dust, <.1mg
0
Truck Driver
2020-11-13
Respirable dust, <.1mg
0
Dry Screen Plant Operator
2018-06-05
Unlisted Particulate, respirable, <1% Qtz
0.28
Washer Operator
2018-06-05
Respirable dust, <.1mg
0
Front-end Loader Operator
2015-10-28
Quartz, respirable, >1% Qtz
0.5
2.4
0.21
Cleanup Man
2015-10-28
Unlisted Particulate, respirable, <1% Qtz
0.14
Front-end Loader Operator
2015-10-28
Quartz, respirable, >1% Qtz
0.4
1.08
0.37
Truck Driver
2015-10-28
Quartz, respirable, >1% Qtz
1.09
1.49
0.73
Cleanup Man
2014-10-29
Quartz, respirable, >1% Qtz
0.13
1.22
0.11
Belt Crew
2014-10-29
Respirable dust, <.1mg
0
Front-end Loader Operator
2014-10-29
Quartz, respirable, >1% Qtz
0.46
1.27
0.36
Laborer, Bullgang
2009-04-23
Quartz, respirable, >1% Qtz
0.21
0.93
0.23
Laborer, Bullgang
2009-04-23
Quartz, respirable, >1% Qtz
0.34
0.87
0.39
Dry Screen Plant Operator
2007-05-16
Quartz, respirable, >1% Qtz
0.43
1.59
0.27
Crusher Oper/Worker
2007-05-16
Quartz, respirable, >1% Qtz
0.28
2
0.14
Laborer, Bullgang
2007-05-16
Quartz, respirable, >1% Qtz
0.58
1.24
0.47
Truck Driver
2007-05-16
Quartz, respirable, >1% Qtz
0.27
1.2
0.23
Truck Driver
2007-05-16
Quartz, respirable, >1% Qtz
0.74
0.76
0.97
Laborer, Bullgang
2005-03-02
Respirable dust, <.1mg
0
Front-end Loader Operator
2005-03-02
Quartz, respirable, >1% Qtz
0.21
1.14
0.18
Crusher Oper/Worker
2005-03-02
Quartz, respirable, >1% Qtz
0.16
1.53
0.10
Front-end Loader Operator
2005-03-02
Quartz, respirable, >1% Qtz
0.32
1.2
0.27
Cleanup Man
2002-03-21
Quartz, respirable, >1% Qtz
0.86
1.46
0.59
Crusher Oper/Worker
2002-03-21
Quartz, respirable, >1% Qtz
0.17
1.33
0.13
Truck Driver
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.
Rialto recorded 5.02 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.
5.02
total case rate
5.02
days-away rate
0.000
fatality rate
Above 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 California, metal and nonmetal mining averaged 1.42 cases per 100 workers that year.
Under 100,000 employee-hours were reported that year, so a single case moves the rate by two or more. Read the figure as approximate.
Year
total case rate
days-away
fatal
2025 *
5.02
5.02
0.000
2024 *
0.00
0.00
0.000
2023 *
0.00
0.00
0.000
2022 *
0.00
0.00
0.000
2021 *
0.00
0.00
0.000
2020 *
0.00
0.00
0.000
2019 *
3.85
0.00
0.000
2018 *
3.76
3.76
0.000
* Fewer than 100,000 employee-hours that year; the rate is less stable.
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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
17
2025
16
2024
16
2023
17
2022
19
2021
20
2020
21
2019
20
2018
24
2017
26
2016
43
2015
45
2014
27
2013
30
2012
29
2011
30
2010
28
2009
27
2008
34
2007
36
2006
30
2005
35
2004
25
2003
35
2002
48
2001
40
2000
29
Source: MSHA quarterly employment and production, updated weekly.
Rialto sits in San Bernardino County, California, where the Census mining category is 0.1% 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.
San Bernardino County, California · Population 2,187,816
0.1%
Mining share of county employment
$82,184
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
11,684
0
0
0.0
2026 Q1
10,647
0
0
0.0
2025 Q4
10,488
0
0
0.0
2025 Q3
10,972
1
0
91.1
2025 Q2
10,451
0
0
0.0
2025 Q1
7,956
1
1
125.7
2024 Q4
9,710
0
0
0.0
2024 Q3
10,605
0
0
0.0
Show 98 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
9,976
0
0
0.0
2024 Q1
8,329
0
0
0.0
2023 Q4
10,664
0
0
0.0
2023 Q3
11,415
1
0
87.6
2023 Q2
11,241
0
0
0.0
2023 Q1
9,780
0
0
0.0
2022 Q4
10,868
0
0
0.0
2022 Q3
11,712
0
0
0.0
2022 Q2
11,675
0
0
0.0
2022 Q1
13,256
0
0
0.0
2021 Q4
12,869
2
0
155.4
2021 Q3
14,088
2
0
142.0
2021 Q2
13,953
0
0
0.0
2021 Q1
12,481
0
0
0.0
2020 Q4
12,682
3
1
236.6
2020 Q3
13,943
0
0
0.0
2020 Q2
13,888
2
0
144.0
2020 Q1
14,812
0
0
0.0
2019 Q4
13,189
3
1
227.5
2019 Q3
13,047
0
0
0.0
2019 Q2
13,685
2
0
146.1
2019 Q1
12,061
0
0
0.0
2018 Q4
13,534
3
0
221.7
2018 Q3
13,097
0
0
0.0
2018 Q2
12,721
2
0
157.2
2018 Q1
13,837
1
1
72.3
2017 Q4
17,353
0
0
0.0
2017 Q3
17,456
1
0
57.3
2017 Q2
16,323
0
0
0.0
2017 Q1
16,023
1
0
62.4
2016 Q4
14,946
0
0
0.0
2016 Q3
17,620
5
2
283.8
2016 Q2
35,667
1
1
28.0
2016 Q1
43,078
0
0
0.0
2015 Q4
34,163
10
3
292.7
2015 Q3
21,105
1
0
47.4
2015 Q2
19,091
0
0
0.0
2015 Q1
19,053
0
0
0.0
2014 Q4
14,956
2
1
133.7
2014 Q3
15,132
1
0
66.1
2014 Q2
16,063
0
0
0.0
2014 Q1
15,395
0
0
0.0
2013 Q4
16,614
0
0
0.0
2013 Q3
19,046
0
0
0.0
2013 Q2
19,152
2
1
104.4
2013 Q1
18,881
0
0
0.0
2012 Q4
17,736
3
0
169.1
2012 Q3
18,086
0
0
0.0
2012 Q2
20,486
1
0
48.8
2012 Q1
19,486
0
0
0.0
2011 Q4
18,488
2
0
108.2
2011 Q3
19,719
0
0
0.0
2011 Q2
18,546
2
0
107.8
2011 Q1
18,631
0
0
0.0
2010 Q4
17,264
8
3
463.4
2010 Q3
17,865
0
0
0.0
2010 Q2
16,635
2
0
120.2
2010 Q1
16,161
0
0
0.0
2009 Q4
14,767
5
1
338.6
2009 Q3
14,806
0
0
0.0
2009 Q2
14,794
9
3
608.4
2009 Q1
16,743
0
0
0.0
2008 Q4
23,615
6
1
254.1
2008 Q3
19,226
0
0
0.0
2008 Q2
25,040
6
2
239.6
2008 Q1
23,109
0
0
0.0
2007 Q4
34,330
5
1
145.6
2007 Q3
27,868
3
0
107.7
2007 Q2
26,306
10
0
380.1
2007 Q1
24,911
0
0
0.0
2006 Q4
23,422
0
0
0.0
2006 Q3
23,504
9
3
382.9
2006 Q2
29,232
0
0
0.0
2006 Q1
18,974
8
0
421.6
2005 Q4
27,824
3
3
107.8
2005 Q3
36,183
8
1
221.1
2005 Q2
22,339
1
0
44.8
2005 Q1
20,305
0
0
0.0
2004 Q4
17,002
0
0
0.0
2004 Q3
19,798
7
2
353.6
2004 Q2
15,140
3
0
198.2
2004 Q1
19,944
5
0
250.7
2003 Q4
18,879
0
0
0.0
2003 Q3
21,164
0
0
0.0
2003 Q2
17,429
4
3
229.5
2003 Q1
36,881
1
1
27.1
2002 Q4
34,922
3
1
85.9
2002 Q3
33,644
7
0
208.1
2002 Q2
32,457
0
0
0.0
2002 Q1
30,579
14
2
457.8
2001 Q4
29,456
0
0
0.0
2001 Q3
27,673
3
0
108.4
2001 Q2
28,036
0
0
0.0
2001 Q1
26,320
0
0
0.0
2000 Q4
22,933
6
2
261.6
2000 Q3
20,896
0
0
0.0
2000 Q2
19,832
0
0
0.0
2000 Q1
16,203
16
6
987.5
No fatalities recorded at this mine.
Reportable incidents
14 on file
2025 · 1 incident
October 17, 2025CA · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanSTRIKING OR BUMPING
Miner was descending down the stairs of 992 front end loader when they slipped on steps slid down 2 steps but remained upright never falling. The steps were wet from the rain and the miner strained their left lower back.
2018 · 1 incident
April 18, 2018CA · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerSLIP OR FALL OF PERSON
Miner has re-aggravated prior injury from 12-28-15
2015 · 2 incidents
December 28, 2015CA · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanHANDTOOLS (NONPOWERED)
Robertson's · Over-exertion in wielding or throwing objects
Miner was shoveling a deck hit when the shovel hit an uneven surface causing his right arm to be pushed back. Miner has right forearm and elbow strain.
The haul road was slick due to rain. The haul truck lost control and rolled over on right side. The operator was knocked out for 2 to 3 minutes at time of incident. After further exam at clinic is right wrist was sprained.
2011 · 1 incident
June 23, 2011CA · Metal/Non-Metalbeltman, conveyor man, conveyor belt worker, mobile bridge carrierman, feeder operator, conveyor riderSLIP OR FALL OF PERSON
Robertson's · Fall from scaffolds, walkways, platforms
Employee failed to follow Company procedures for safe access when entering belt press area. Employee removed a removable catwalk (only used when replacing the gear box is necessary. The gear box is lowered through the opening using a crane) and proceeded to climb down framework to catwalk 5 ft below. While climbing down, employee slipped and fell approx 3 feet.
2009 · 1 incident
May 11, 2009CA · Metal/Non-Metalbeltman, conveyor man, conveyor belt worker, mobile bridge carrierman, feeder operator, conveyor riderEXPLOSIVES AND BREAKING AGENTS
Injury was standing approximately 6' from a 400 horsepower motor to a cone crusher when a mechanical failure caused the fan to come apart inside the fan housing which in turn exploded and one of the many pieces of the fan assembly struck him in his right leg 6" above his ankle thus breaking his leg
2007 · 1 incident
November 27, 2007CA · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanPOWERED HAULAGE
While pulling wire through a conduit pipe on a 500' run with a p/u truck, the rope we used to pull the electrical wire with was tied in a square knot around a 6" C-clamp which was attached through one of the loops on the trailer hitch assembly. The clamp twisted off the hitch assembly & hit the employee above the right knee on the side of his leg leaving a very small cut.
2006 · 1 incident
July 13, 2006CA · Metal/Non-Metalbeltman, conveyor man, conveyor belt worker, mobile bridge carrierman, feeder operator, conveyor riderHANDLING OF MATERIALS
Robertson's · Caught in, under or between a moving and a stationary object
EE was removing a return roller and when he rolled it out of the bracket he got his middle finger on his left hand slightly smashed between the roller and the roller bracket. We weren't even aware he went to the clinic until he turned paperwork in 3 weeks later.
2005 · 1 incident
December 14, 2005CA · Metal/Non-Metalbeltman, conveyor man, conveyor belt worker, mobile bridge carrierman, feeder operator, conveyor riderSLIP OR FALL OF PERSON
The employee was working with another EE off a man-lift without a safety harness. The man-lift needed to be moved & he elected to stay on the belt without being strapped in, and at some point got impatient & he took it upon himself to walk down the belt leading to the belt press and lost his balance and falling approximately 16' breaking a bone above his right ankle.
2003 · 1 incident
February 14, 2003CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techPOWERED HAULAGE
EE HAD BEEN WORKING ON A PIECE OF EQUIPMENT WHEN HE WAS DONE HE DROVE AROUND THE EQUIPMENT ONTO THE HAUL ROAD WITHOUT LOOKING AND WAS HIT BY THE HAUL TRUCK.