Montecielo Quarry LLC has $115K in proposed MSHA penalties and $28K outstanding across 0 contested dockets, plus health sampling and the full incident record.
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Fatalities
0
Total incidents
2
Years on record
2023–2025
Latest incident
Aug 2025
Compliance record
MSHA citations since 2005
247
citations
68
significant & substantial
$114,955
proposed penalties
$87,026
paid to date
76% of proposed penalties paid to date, a $27,929 gap.
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.
247 citations across 1,334 inspection hours.
Source: MSHA inspections data, updated weekly.
Imminent-danger orders
ⓘA Section 107(a) order removes miners from an area when an inspector finds an imminent danger. Each order is lifted once the condition is corrected, so this counts orders issued, not orders now in effect.
3
Section 107(a) orders
Most recent order: 2020-11-17.
On record since 2014.
Source: MSHA imminent-danger order records, updated weekly.
Montecielo Quarry LLC has $115K in proposed MSHA penalties and $28K outstanding across 0 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.
$115K
proposed penalties
$115K
current assessed
$87K
paid to date
$28K
outstanding
233 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-04-28.
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.
Source: MSHA violations gravity and negligence coding, 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: 2025-11-18
0%
of limit-tested samples over the exposure limit
9
samples
7
limit-tested
Most sampled contaminants
Nuisance dust, total, <1% Qtz3
Nuisance dust, respirable, <1% Qtz2
Quartz, respirable, >1% Qtz2
Respirable dust, <.1mg2
Show the individual readings (9)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2025-11-18
Nuisance dust, respirable, <1% Qtz
0.14
10
0.01
Backhoe Operator
2025-11-18
Respirable dust, <.1mg
0
Backhoe Operator
2025-04-22
Nuisance dust, total, <1% Qtz
0.39
10
0.04
Front-end Loader Operator
2025-04-22
Nuisance dust, total, <1% Qtz
1.71
10
0.17
Crusher Oper/Worker
2024-09-17
Respirable dust, <.1mg
0
Truck Driver
2024-09-17
Nuisance dust, total, <1% Qtz
0.57
10
0.06
Backhoe Operator
2009-11-03
Quartz, respirable, >1% Qtz
0.28
2.41
0.12
Front-end Loader Operator
2005-06-01
Quartz, respirable, >1% Qtz
0.18
1.01
0.18
Front-end Loader Operator
2005-06-01
Nuisance dust, respirable, <1% Qtz
0.12
10
0.01
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.
Montecielo Quarry LLC 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
No reportable injury cases in any year shown. Employee-hours were reported in each of those years, so these are true zeros rather than missing data. Citations, listed in the compliance record above, are inspector-found violations and are counted separately from worker injuries.
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 Puerto Rico, metal and nonmetal mining averaged 3.46 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 *
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
2026
9
2025
9
2024
13
2023
14
2022
12
2021
12
2020
9
2019
11
2018
10
2017
8
2016
7
2015
9
2014
10
2013
5
2012
6
2011
7
2010
7
2009
15
2008
18
2007
10
2006
8
2005
3
Source: MSHA quarterly employment and production, updated weekly.
Montecielo Quarry LLC sits in Bayamón Municipio, Puerto Rico, where the Census mining category is 0.0% 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.
Bayamón Municipio, Puerto Rico · Population 183,456
0.0%
Mining share of county employment
$30,729
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
4,424
2
0
452.1
2026 Q1
3,966
0
0
0.0
2025 Q4
4,260
7
3
1643.2
2025 Q3
3,157
5
2
1583.8
2025 Q2
3,417
1
0
292.7
2025 Q1
3,312
2
1
603.9
2024 Q4
4,051
0
0
0.0
2024 Q3
4,589
3
0
653.7
Show 76 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
4,248
0
0
0.0
2024 Q1
4,278
14
4
3272.6
2023 Q4
4,603
0
0
0.0
2023 Q3
4,331
13
1
3001.6
2023 Q2
5,001
0
0
0.0
2023 Q1
4,395
11
1
2502.8
2022 Q4
4,808
0
0
0.0
2022 Q3
4,582
7
1
1527.7
2022 Q2
4,465
0
0
0.0
2022 Q1
4,574
5
1
1093.1
2021 Q4
3,098
0
0
0.0
2021 Q3
3,731
4
1
1072.1
2021 Q2
4,438
0
0
0.0
2021 Q1
3,585
5
1
1394.7
2020 Q4
4,180
6
2
1435.4
2020 Q3
3,391
9
3
2654.1
2020 Q2
2,681
0
0
0.0
2020 Q1
4,199
5
0
1190.8
2019 Q4
5,374
2
0
372.2
2019 Q3
4,816
17
5
3529.9
2019 Q2
3,744
0
0
0.0
2019 Q1
4,435
5
2
1127.4
2018 Q4
5,295
0
0
0.0
2018 Q3
4,377
3
0
685.4
2018 Q2
4,882
0
0
0.0
2018 Q1
3,852
4
2
1038.4
2017 Q4
3,908
0
0
0.0
2017 Q3
3,356
4
1
1191.9
2017 Q2
3,950
1
0
253.2
2017 Q1
2,349
4
1
1702.9
2016 Q4
3,515
0
0
0.0
2016 Q3
2,626
3
1
1142.4
2016 Q2
2,052
0
0
0.0
2016 Q1
2,481
6
2
2418.4
2015 Q4
3,291
0
0
0.0
2015 Q3
3,364
2
1
594.5
2015 Q2
3,429
0
0
0.0
2015 Q1
3,187
0
0
0.0
2014 Q4
4,193
7
2
1669.4
2014 Q3
3,997
6
2
1501.1
2014 Q2
4,988
0
0
0.0
2014 Q1
2,213
0
0
0.0
2013 Q4
2,517
7
5
2781.1
2013 Q3
2,538
0
0
0.0
2013 Q2
2,708
4
0
1477.1
2013 Q1
2,452
0
0
0.0
2012 Q4
1,567
4
1
2552.6
2012 Q2
988
0
0
0.0
2012 Q1
3,199
5
2
1563.0
2011 Q4
3,934
0
0
0.0
2011 Q3
3,694
0
0
0.0
2011 Q2
3,648
3
0
822.4
2011 Q1
3,781
0
0
0.0
2010 Q4
2,938
4
1
1361.5
2010 Q3
2,887
0
0
0.0
2010 Q2
3,052
4
1
1310.6
2010 Q1
3,338
0
0
0.0
2009 Q4
5,952
3
0
504.0
2009 Q3
6,368
0
0
0.0
2009 Q2
6,605
1
0
151.4
2009 Q1
7,224
1
0
138.4
2008 Q4
8,710
4
2
459.2
2008 Q3
8,546
0
0
0.0
2008 Q2
8,989
3
1
333.7
2008 Q1
9,353
0
0
0.0
2007 Q4
8,750
1
0
114.3
2007 Q3
3,508
3
1
855.2
2007 Q2
3,086
0
0
0.0
2007 Q1
2,757
2
2
725.4
2006 Q4
4,815
0
0
0.0
2006 Q3
2,221
2
1
900.5
2006 Q2
2,274
0
0
0.0
2006 Q1
2,501
1
0
399.8
2005 Q4
1,355
6
1
4428.0
2005 Q3
1,008
0
0
0.0
2005 Q2
369
3
2
8130.1
No fatalities recorded at this mine.
Reportable incidents
2 on file
2025 · 1 incident
August 21, 2025PR · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
BLUE ROCK INC · Struck by... (Not Elsewhere Classified)
EL Señor Jose Valdes se disponia a conectar la correa manualmente cuando se quito el capacete para inclinarsehacia abajo y sufrio un impacto y se percata que una piedra le dio en la cabeza causando una herida abierta.
2023 · 1 incident
September 11, 2023PR · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS