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: 164 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 has $1K 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.
$1K
proposed penalties
$1K
current assessed
$1K
paid to date
$0
outstanding
19 assessments are final orders; 2 contested dockets.
Of $742 in penalties contested before the Commission, $117 was upheld in final decisions.
As of the most recent assessment on 2011-12-15.
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.
2citations taken to the federal commission · 11% of citations on record
Settled
1 · 50%
Stood as issued
1 · 50%
84%
Penalty reduction in decided contests
$742 proposed, $117 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 A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record.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 2012-01-30.
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: 2009-08-11, 17 years ago
0%
of limit-tested samples over the exposure limit
4
samples
2
limit-tested
Most sampled contaminants
Quartz, respirable, >1% Qtz2
Respirable dust, <.1mg2
Show the individual readings (4)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2009-08-11
Quartz, respirable, >1% Qtz
0.24
0.4
0.60
Crusher Oper/Worker
2009-08-11
Respirable dust, <.1mg
0
Front-end Loader Operator
2007-08-30
Respirable dust, <.1mg
0
Front-end Loader Operator
2007-08-30
Quartz, respirable, >1% Qtz
0.3
0.44
0.68
Crusher Oper/Worker
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 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 *
8.25
0.00
0.000
2007 *
0.00
0.00
0.000
2006 *
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
2012
5
2011
11
2010
8
2009
9
2008
10
2007
11
2006
9
2005
7
Source: MSHA quarterly employment and production, updated weekly.
MESA 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
2012 Q3
685
0
0
0.0
2012 Q2
1,542
0
0
0.0
2012 Q1
2,433
0
0
0.0
2011 Q4
2,362
2
0
846.7
2011 Q3
4,209
0
0
0.0
2011 Q2
4,254
0
0
0.0
2011 Q1
6,517
0
0
0.0
2010 Q4
4,874
0
0
0.0
Show 21 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2010 Q3
6,508
0
0
0.0
2010 Q2
3,935
0
0
0.0
2010 Q1
3,612
0
0
0.0
2009 Q4
4,916
0
0
0.0
2009 Q3
6,877
0
0
0.0
2009 Q2
5,499
0
0
0.0
2009 Q1
4,993
0
0
0.0
2008 Q4
6,094
0
0
0.0
2008 Q3
6,812
0
0
0.0
2008 Q2
5,703
0
0
0.0
2008 Q1
5,620
1
0
177.9
2007 Q4
6,264
0
0
0.0
2007 Q3
7,399
0
0
0.0
2007 Q2
7,447
0
0
0.0
2007 Q1
6,586
3
0
455.5
2006 Q4
7,125
0
0
0.0
2006 Q3
6,240
1
0
160.3
2006 Q2
5,767
0
0
0.0
2006 Q1
5,414
11
2
2031.8
2005 Q4
5,328
0
0
0.0
2005 Q3
2,675
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
2 on file
2008 · 1 incident
February 14, 2008AZ · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
CalMat Co · Struck by... (Not Elsewhere Classified)
Employee was removing a race from a bearing when a metal fragment hit him on the upper lip and damaged his front tooth.
2005 · 1 incident
September 24, 2005AZ · Metal/Non-Metalfront-end loader, scraper-loader operator, pan operator, payloader, scraper rig operatorHANDTOOLS (NONPOWERED)
CalMat Co · Caught in, under or between (Not Elsewhere Classified)
EE STATES HE WAS CUTTING THE BOTTOM DISCHARGE CHUTE PLATE & USING A SLEDGE HAMMER TO KNOCK IT FREE WHEN THE TOP CHUTE PLATE CAME DOWN & CAUGHT THE HAMMER & THE TIP OF HIS LEFT RING FINGER CAUSING A CRUSHING INJURY.