Gerken Materials Inc. · Struck by falling object
Employee was changing a roller on the feeder conveyor, and the end of the roller fell down and landed on right-hand index finger splitting it open on both sides of finger.
Round Lake Sand and Gravel West Plt: 23 MSHA citations Metal/Non-Metal
Gerken Materials Inc.
· Surface
Controlled by
Brent Gerken; Michael J Gerken
Brooklyn,
Lenawee County,
MI
·
Active
MSHA Mine ID: 2003447
Round Lake Sand and Gravel West Plt has $3K in proposed MSHA penalties and $0 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
- 2020–2026
- Latest incident
- Jul 2026
Compliance record
MSHA citations since 2011
23
citations
3
significant & substantial
$2,989
proposed penalties
$2,989
paid to date
100% of proposed penalties paid to date, a $0 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2011
19
inspections on record
245
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: 245 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Round Lake Sand and Gravel West Plt has $3K 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.$3K
proposed penalties
$3K
current assessed
$3K
paid to date
$0
outstanding
23 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-04-07.
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.13.0%
significant & substantial
4.3%
high negligence or reckless
13.0%
reasonably likely or greater
30.4%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 30.4% low, 65.2% moderate, 4.3% high, 0.0% reckless.
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: 2026-04-08
ⓘ
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.13
samples
0
limit-tested
Most sampled contaminants
- Respirable dust, <.1mg13
Show the individual readings (13)
| Date | Contaminant | Concentration | Limit | Conc / limit | Occupation |
|---|---|---|---|---|---|
| 2026-04-08 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2026-04-08 | Respirable dust, <.1mg | 0 | Washer Operator | ||
| 2026-04-08 | Respirable dust, <.1mg | 0 | Laborer, Bullgang | ||
| 2024-12-04 | Respirable dust, <.1mg | 0 | Truck Driver | ||
| 2024-12-04 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2024-12-04 | Respirable dust, <.1mg | 0 | Truck Driver | ||
| 2024-12-04 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2020-12-01 | Respirable dust, <.1mg | 0 | Laborer, Bullgang | ||
| 2020-12-01 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2020-12-01 | Respirable dust, <.1mg | 0 | Washer Operator | ||
| 2011-06-02 | Respirable dust, <.1mg | 0 | Bulldozer Operator | ||
| 2011-06-02 | Respirable dust, <.1mg | 0 | Backhoe Operator | ||
| 2011-06-02 | Respirable dust, <.1mg | 0 | Front-end Loader Operator |
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.
Ownership history
- Woodstock Aggregate, LLC 2010 to 2015
- Gerken Materials Inc. 2015 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
| Year | Employees |
|---|---|
| 2026 | 10 |
| 2025 | 9 |
| 2024 | 8 |
| 2023 | 8 |
| 2022 | 9 |
| 2021 | 9 |
| 2020 | 8 |
| 2019 | 9 |
| 2013 | 2 |
| 2012 | 4 |
| 2011 | 5 |
Source: MSHA quarterly employment and production, updated weekly.
Round Lake Sand and Gravel West Plt sits in Lenawee County, Michigan, 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.Lenawee County, Michigan · Population 98,823
0.1%
Mining share of county employment
$67,013
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 | 5,415 | 1 | 0 | 184.7 |
| 2026 Q1 | 4,080 | 0 | 0 | 0.0 |
| 2025 Q4 | 4,491 | 0 | 0 | 0.0 |
| 2025 Q3 | 4,969 | 0 | 0 | 0.0 |
| 2025 Q2 | 4,836 | 1 | 0 | 206.8 |
| 2025 Q1 | 3,555 | 0 | 0 | 0.0 |
| 2024 Q4 | 4,251 | 1 | 0 | 235.2 |
| 2024 Q3 | 4,385 | 0 | 0 | 0.0 |
Show 28 earlier quarters Hide earlier quarters
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2024 Q2 | 4,461 | 2 | 0 | 448.3 |
| 2024 Q1 | 3,839 | 2 | 0 | 521.0 |
| 2023 Q4 | 4,308 | 0 | 0 | 0.0 |
| 2023 Q3 | 4,282 | 0 | 0 | 0.0 |
| 2023 Q2 | 4,395 | 0 | 0 | 0.0 |
| 2023 Q1 | 4,178 | 0 | 0 | 0.0 |
| 2022 Q4 | 4,312 | 0 | 0 | 0.0 |
| 2022 Q3 | 4,778 | 0 | 0 | 0.0 |
| 2022 Q2 | 4,919 | 1 | 0 | 203.3 |
| 2022 Q1 | 3,496 | 0 | 0 | 0.0 |
| 2021 Q4 | 5,008 | 0 | 0 | 0.0 |
| 2021 Q3 | 5,075 | 0 | 0 | 0.0 |
| 2021 Q2 | 4,900 | 4 | 1 | 816.3 |
| 2021 Q1 | 3,765 | 0 | 0 | 0.0 |
| 2020 Q4 | 4,595 | 1 | 0 | 217.6 |
| 2020 Q3 | 4,241 | 0 | 0 | 0.0 |
| 2020 Q2 | 5,221 | 0 | 0 | 0.0 |
| 2020 Q1 | 3,971 | 0 | 0 | 0.0 |
| 2019 Q4 | 4,797 | 0 | 0 | 0.0 |
| 2019 Q3 | 5,563 | 0 | 0 | 0.0 |
| 2013 Q1 | 75 | 0 | 0 | 0.0 |
| 2012 Q4 | 972 | 0 | 0 | 0.0 |
| 2012 Q3 | 1,240 | 0 | 0 | 0.0 |
| 2012 Q2 | 1,328 | 2 | 0 | 1506.0 |
| 2012 Q1 | 1,554 | 0 | 0 | 0.0 |
| 2011 Q4 | 1,480 | 0 | 0 | 0.0 |
| 2011 Q3 | 1,810 | 1 | 0 | 552.5 |
| 2011 Q2 | 2,492 | 6 | 1 | 2407.7 |
No fatalities recorded at this mine.
Reportable incidents
2 on file2026 · 1 incident
2020 · 1 incident
December 8, 2020
MI · Metal/Non-Metal
front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator
SLIP OR FALL OF PERSON
Gerken Materials Inc. · Over-exertion (Not Elsewhere Classified)
Employee was climbing down steps of front end loader and stepped to ground and twisted EE's ankle.