Prior Lake Aggregates Inc has $15K in proposed MSHA penalties and $0 outstanding across 0 contested dockets, plus health sampling and the full incident record.
Watch this mine
Email me when a new MSHA incident is filed at Prior Lake Aggregates Inc.
Fatalities
0
Total incidents
14
Years on record
1983–2000
Latest incident
Nov 2000
Compliance record
MSHA citations since 2000
106
citations
17
significant & substantial
$14,891
proposed penalties
$14,891
paid to date
100% of proposed penalties paid to date, a $0 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
44
inspections on record
596
inspection hours
n/a
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: 596 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Prior Lake Aggregates Inc has $15K in proposed MSHA penalties and $0 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.
$15K
proposed penalties
$15K
current assessed
$15K
paid to date
$0
outstanding
106 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-03-10.
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: 2026-03-11
0%
of limit-tested samples over the exposure limit
16
samples
2
limit-tested
Most sampled contaminants
Respirable dust, <.1mg12
Quartz, respirable, >1% Qtz2
Unlisted Particulate, respirable, <1% Qtz2
Show the individual readings (16)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2026-03-11
Respirable dust, <.1mg
0
Front-end Loader Operator
2023-10-25
Respirable dust, <.1mg
0
Dry Screen Plant Operator
2023-10-25
Respirable dust, <.1mg
0
Crusher Oper/Worker
2023-10-25
Respirable dust, <.1mg
0
Dragline Operator
2019-07-10
Unlisted Particulate, respirable, <1% Qtz
0.18
Front-end Loader Operator
2019-07-10
Respirable dust, <.1mg
0
Mechanic
2019-07-10
Respirable dust, <.1mg
0
Crusher Oper/Worker
2018-09-26
Respirable dust, <.1mg
0
Crusher Oper/Worker
2016-12-06
Respirable dust, <.1mg
0
Crusher Oper/Worker
2016-12-06
Respirable dust, <.1mg
0
Laborer, Bullgang
2004-10-27
Respirable dust, <.1mg
0
Crusher Oper/Worker
2004-10-27
Unlisted Particulate, respirable, <1% Qtz
0.19
Complete Load-Haul-Dump
2004-10-27
Quartz, respirable, >1% Qtz
0.65
1.34
0.49
Front-end Loader Operator
2003-10-29
Respirable dust, <.1mg
0
Front-end Loader Operator
2003-10-29
Quartz, respirable, >1% Qtz
0.12
1.25
0.10
Truck Driver
2003-10-29
Respirable dust, <.1mg
0
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.
Prior Lake Aggregates Inc 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
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 1.65 and the all-US-mining average was 1.97 cases per 100 workers.
In Minnesota, metal and nonmetal mining averaged 1.47 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 *
0.00
0.00
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 *
0.00
0.00
0.000
2018 *
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.
Pentagon Materials Inc. DBA Prior Lake Aggregates2018 to 2026
Bituminous Roadways, Inc.2026 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
9
2025
14
2024
13
2023
12
2022
13
2021
11
2020
10
2019
10
2018
11
2017
8
2016
10
2015
9
2014
10
2013
10
2012
11
2011
10
2010
12
2009
11
2008
12
2007
14
2006
13
2005
11
2004
13
2003
15
2002
15
2001
15
2000
16
Source: MSHA quarterly employment and production, updated weekly.
Prior Lake Aggregates Inc sits in Scott County, Minnesota, where the Census mining category is 0.3% 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.
Scott County, Minnesota · Population 152,957
0.3%
Mining share of county employment
$120,247
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
OPERATOR WAS DUMPING SAND INTO WATER HOLE TO FILL IT. SAND BANK GAVE WAY AND TRUCK WENT INTO WATER HOLE. DRIVER HURT LEFT LEG WHILE EXITING TRUCK.
1998 · 1 incident
April 24, 1998MN · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorSLIP OR FALL OF PERSON
WHILE CLIMBING UP ON LOADER TO START IT, SLIPPEDON SNOW AND FELL OFF. LANDED ON FEET BUT BROKE BONE IN RIGHT LEG.
1995 · 2 incidents
March 10, 1995MN · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
EMPLOYEE TOLD EMPLOYER ON 2/24/95 OF CARPAL TUNNEL PAIN AND WANTS TO SEE A DR. EMPLOYER FILED WORK COMP FORM WITH IT'S INSURANCE COMPANY SO THAT AN APPOINTMENT COULD BE MADE WITH DR. (NO LOST TIME TO DATE)
1994 · 3 incidents
July 1, 1994MN · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techSTEPPING OR KNEELING ON OBJECT
WHILE CLEANING SHIELD UNDER CONVEYOR BELT RIGHT HAND WAS CUAGHT XXX AND EMPLOYEE RECEIVED SOME SKIN LOSS AND A FRICTION BURN.
1991 · 1 incident
April 30, 1991MN · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
SPRAINED RIGHT ANKLE WHILE STEPPING DOWN FROM TS24 SCRAPER.
1983 · 1 incident
August 10, 1983MN · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorSLIP OR FALL OF PERSON