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.
Rate withheld: 448 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Mesa Plant has $32K in proposed MSHA penalties and $60 outstanding across 1 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.
$32K
proposed penalties
$32K
current assessed
$32K
paid to date
$60
outstanding
118 assessments are final orders; 1 contested dockets.
Of $660 in penalties contested before the Commission, $0 was upheld in final decisions.
As of the most recent assessment on 2009-10-19.
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.
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: 2010-09-29, 15 years ago
0%
of limit-tested samples over the exposure limit
16
samples
9
limit-tested
Most sampled contaminants
Quartz, respirable, >1% Qtz9
Unlisted Particulate, respirable, <1% Qtz4
Respirable dust, <.1mg3
Show the individual readings (16)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2010-09-29
Respirable dust, <.1mg
0
Front-end Loader Operator
2006-05-16
Unlisted Particulate, respirable, <1% Qtz
0.14
Bulldozer Operator
2006-05-16
Unlisted Particulate, respirable, <1% Qtz
0.13
Front-end Loader Operator
2006-05-16
Quartz, respirable, >1% Qtz
0.65
0.94
0.69
Crusher Oper/Worker
2006-05-16
Respirable dust, <.1mg
0
Front-end Loader Operator
2006-03-01
Quartz, respirable, >1% Qtz
0.58
0.78
0.74
Crusher Oper/Worker
2006-03-01
Unlisted Particulate, respirable, <1% Qtz
0.15
Front-end Loader Operator
2006-03-01
Quartz, respirable, >1% Qtz
0.82
1.04
0.79
Crusher Oper/Worker
2006-03-01
Quartz, respirable, >1% Qtz
0.17
1.59
0.11
Front-end Loader Operator
2004-10-26
Quartz, respirable, >1% Qtz
0.23
1.2
0.19
Crusher Oper/Worker
2004-10-26
Quartz, respirable, >1% Qtz
0.29
2.05
0.14
Utility Man
2004-10-26
Quartz, respirable, >1% Qtz
0.34
1.44
0.24
Mechanic
2004-03-18
Quartz, respirable, >1% Qtz
0.4
0.82
0.49
Mechanic
2004-03-18
Quartz, respirable, >1% Qtz
0.51
0.67
0.76
Crusher Oper/Worker
2004-03-18
Unlisted Particulate, respirable, <1% Qtz
0.14
Front-end Loader Operator
2004-03-18
Respirable dust, <.1mg
0
Cleanup Man
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.
Mesa Plant recorded 0.00 reportable injury cases per 100 full-time workers in 2009.
Injury rate, 2009
ⓘ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 2.82 and the all-US-mining average was 3.36 cases per 100 workers.
In Arizona, metal and nonmetal mining averaged 2.88 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
2009 *
0.00
0.00
0.000
2008 *
6.32
0.00
0.000
2007 *
5.92
0.00
0.000
2006 *
2.62
2.62
0.000
2005 *
6.48
3.24
0.000
2004 *
0.00
0.00
0.000
2003 *
6.54
0.00
0.000
2002 *
0.00
0.00
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
2011
0
2010
9
2009
14
2008
32
2007
29
2006
37
2005
27
2004
29
2003
28
2002
28
2001
26
2000
25
Source: MSHA quarterly employment and production, updated weekly.
Mesa Plant sits in Maricopa County, Arizona, where the Census mining category is 0.2% 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.
Maricopa County, Arizona · Population 4,491,987
0.2%
Mining share of county employment
$85,518
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
2011 Q3
0
0
0
2011 Q2
0
0
0
2011 Q1
0
0
0
2010 Q4
3,422
0
0
0.0
2010 Q3
4,532
0
0
0.0
2010 Q2
4,584
0
0
0.0
2010 Q1
4,122
0
0
0.0
2009 Q4
5,137
1
0
194.7
Show 39 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2009 Q3
7,417
0
0
0.0
2009 Q2
7,908
0
0
0.0
2009 Q1
7,967
0
0
0.0
2008 Q4
13,296
4
0
300.8
2008 Q3
17,198
0
0
0.0
2008 Q2
16,238
2
0
123.2
2008 Q1
16,593
3
0
180.8
2007 Q4
17,703
0
0
0.0
2007 Q3
16,650
3
0
180.2
2007 Q2
17,310
0
0
0.0
2007 Q1
15,873
9
1
567.0
2006 Q4
18,198
0
0
0.0
2006 Q3
15,992
0
0
0.0
2006 Q2
22,156
2
1
90.3
2006 Q1
19,858
7
2
352.5
2005 Q4
17,660
0
0
0.0
2005 Q3
17,985
31
11
1723.7
2005 Q2
9,143
0
0
0.0
2005 Q1
16,947
0
0
0.0
2004 Q4
17,953
12
0
668.4
2004 Q3
17,009
0
0
0.0
2004 Q2
15,802
1
1
63.3
2004 Q1
14,721
10
7
679.3
2003 Q4
15,369
0
0
0.0
2003 Q3
15,019
1
1
66.6
2003 Q2
16,016
0
0
0.0
2003 Q1
14,751
3
0
203.4
2002 Q4
14,215
3
0
211.0
2002 Q3
14,985
0
0
0.0
2002 Q2
15,886
0
0
0.0
2002 Q1
16,106
2
0
124.2
2001 Q4
16,707
0
0
0.0
2001 Q3
14,197
0
0
0.0
2001 Q2
15,428
0
0
0.0
2001 Q1
14,936
0
0
0.0
2000 Q4
14,884
6
5
403.1
2000 Q3
14,842
0
0
0.0
2000 Q2
13,878
15
9
1080.8
2000 Q1
13,746
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
38 on file
2008 · 2 incidents
September 29, 2008AZ · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorHANDTOOLS (NONPOWERED)
Helping change crusher liner holding onto tag line and stepped between crusher and catwalk area. **Employee reported to plant manager and they determined no injury. On 7/17/07 the employee's elbow was swollen & he was sent to the clinic and fluid was removed.**
EE WAS CLEANING GRIZZLY ON JAW FEEDER WITH A 8 LB HAMMER. THE HAMMER CAME IN CONTACT WITH THE UPPER BEAM SUPPORT AND STRUCK EE ON LEFT SIDE OF HIS HEAD.
2000 · 3 incidents
September 20, 2000AZ · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanHANDLING OF MATERIALS
WHILE HELPING INSTALL ROLLERS IN A SCREEN THE ROLLER SLIPPED OUT OF ITS KEEPER. THE EMPLOYEE REACHED TO CATCH IT AND STRAINED THE MUSCLES IN HIS BACK.
September 15, 2000AZ · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
WHILE REPLACING BELT AND TAIL PULLEY ON MP02 CONVEYOR. THE EE WAS HELPING LEFT THE TAIL PULLEY INTO PLACE WHEN THE TAIL PULLEY SLIPPED AND CAUGHT HIS HAND PUSHING IT AGAINST THE FRAME.
July 28, 2000AZ · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDTOOLS (NONPOWERED)
AFTER CONE CRUSHER ADJUSTMENT WAS COMPLETED THE MACHINERY WAS PUT INTO A SINGLE PHASE STARTUP. EQUIP WAS THEN TURNED OFF, ELECTRICAL PANEL WAS OPENED ON BACKSIDE WITH DISCONNECT STILL ENERGIZE D. KNIFE EDGE ON DISCONNECT WAS PUSHED IN WITH A SLEDGE HAMMER. THE HAMMER TOUCHED TWO PHASES OF 480 VOLTS TOGETHER RESULTING IN FLAMES TOWARD EE. ELECT. PANEL WAS DESTROYED.
1993 · 1 incident
August 12, 1993AZ · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerPOWERED HAULAGE
September 25, 1990AZ · Metal/Non-Metalhaul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driverSLIP OR FALL OF PERSON
WORKING AT CRU8HER PLANT AROUND CONVEYOR BELT WAS STRUCK BY BOULDER IN HEAD AT HIGH RATE OF SPEED KNOCKING HARD HELMET OFF AND CAUSING ABRASION TO HEAD.
July 20, 1985AZ · Metal/Non-Metalmine manager, mine foreman, mine ownerHANDLING OF MATERIALS