PORTABLE DRILL DEPT 531 Metal/Non-Metal
MSHA record for PORTABLE DRILL DEPT 531 (mine ID 1302500). Fatalities, non-fatal incidents grouped by year, current operator and controller, and mine context.
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- Fatalities
- 0
- Total incidents
- 0
- Years on record
- —
- Latest incident
- —
Inspection activity
MSHA inspections since 2020
6
inspections on record
32
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: 32 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, 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: 2023-03-28, 3 years ago
ⓘ
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.0%
of limit-tested samples over the exposure limit
2
samples
1
limit-tested
Most sampled contaminants
- Nuisance dust, total, <1% Qtz1
- Respirable dust, <.1mg1
Show the individual readings (2)
| Date | Contaminant | Concentration | Limit | Conc / limit | Occupation |
|---|---|---|---|---|---|
| 2023-03-28 | Nuisance dust, total, <1% Qtz | 0 | 10 | 0.00 | Drill Operator, Rotary |
| 2021-01-20 | Respirable dust, <.1mg | 0 | Drill Operator, Rotary Air |
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
- Wendling Quarries, Inc. 2020 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
| Year | Employees |
|---|---|
| 2026 | 1 |
| 2025 | 1 |
| 2024 | 1 |
| 2023 | 2 |
| 2022 | 1 |
| 2021 | 1 |
| 2020 | 1 |
Source: MSHA quarterly employment and production, updated weekly.
PORTABLE DRILL DEPT 531 sits in Clinton County, Iowa, 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.Clinton County, Iowa · Population 46,383
0.2%
Mining share of county employment
$65,177
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 | 59 | 0 | 0 | 0.0 |
| 2026 Q1 | 8 | 0 | 0 | 0.0 |
| 2025 Q4 | 470 | 0 | 0 | 0.0 |
| 2025 Q3 | 634 | 0 | 0 | 0.0 |
| 2025 Q2 | 202 | 0 | 0 | 0.0 |
| 2025 Q1 | 477 | 0 | 0 | 0.0 |
| 2024 Q4 | 382 | 0 | 0 | 0.0 |
| 2024 Q3 | 619 | 0 | 0 | 0.0 |
Show 15 earlier quarters Hide earlier quarters
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2024 Q2 | 397 | 0 | 0 | 0.0 |
| 2024 Q1 | 545 | 0 | 0 | 0.0 |
| 2023 Q4 | 357 | 0 | 0 | 0.0 |
| 2023 Q3 | 784 | 0 | 0 | 0.0 |
| 2023 Q2 | 704 | 0 | 0 | 0.0 |
| 2023 Q1 | 519 | 0 | 0 | 0.0 |
| 2022 Q4 | 686 | 0 | 0 | 0.0 |
| 2022 Q3 | 790 | 0 | 0 | 0.0 |
| 2022 Q2 | 285 | 0 | 0 | 0.0 |
| 2022 Q1 | 263 | 0 | 0 | 0.0 |
| 2021 Q4 | 354 | 0 | 0 | 0.0 |
| 2021 Q3 | 355 | 0 | 0 | 0.0 |
| 2021 Q2 | 347 | 0 | 0 | 0.0 |
| 2021 Q1 | 235 | 0 | 0 | 0.0 |
| 2020 Q4 | 372 | 0 | 0 | 0.0 |
No reportable incidents on file.
MSHA has no recorded reportable accidents for this mine in the current dataset. New reports appear here within a week of being filed.