Sprague Stone LLC: 41 MSHA citations Metal/Non-Metal
Sprague Stone LLC has $5K in proposed MSHA penalties and $604 outstanding across 0 contested dockets, plus health sampling and the full incident record.
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- Fatalities
- 0
- Total incidents
- 0
- Years on record
- —
- Latest incident
- —
Compliance record
MSHA citations since 2017
41
citations
3
significant & substantial
$5,452
proposed penalties
$4,848
paid to date
89% of proposed penalties paid to date, a $604 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2017
25
inspections on record
338
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: 338 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Sprague Stone LLC has $5K in proposed MSHA penalties and $604 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.$5K
proposed penalties
$5K
current assessed
$5K
paid to date
$604
outstanding
39 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-06-16.
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.7.3%
significant & substantial
31.7%
high negligence or reckless
7.3%
reasonably likely or greater
22.0%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 4.9% low, 63.4% moderate, 31.7% 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: 2026-06-17
ⓘ
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.25%
of limit-tested samples over the exposure limit
16
samples
12
limit-tested
Most sampled contaminants
- Quartz, respirable, >1% Qtz123 over
- Respirable dust, <.1mg4
Show the individual readings (16)
| Date | Contaminant | Concentration | Limit | Conc / limit | Occupation |
|---|---|---|---|---|---|
| 2026-06-17 | Quartz, respirable, >1% Qtz | 0.28 | 0.27 | 1.04 | Stone Polisher/Cutter |
| 2023-11-07 | Quartz, respirable, >1% Qtz | 0.36 | 0.28 | 1.29 | Cutting Mach Helper |
| 2018-10-23 | Quartz, respirable, >1% Qtz | 0.36 | 0.3 | 1.20 | Stone Polisher/Cutter |
| 2026-06-17 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2026-06-17 | Respirable dust, <.1mg | 0 | Laborer, Bullgang | ||
| 2026-06-17 | Quartz, respirable, >1% Qtz | 0.18 | 0.3 | 0.60 | Stone Polisher/Cutter |
| 2023-11-07 | Quartz, respirable, >1% Qtz | 0.13 | 0.41 | 0.32 | Front-end Loader Operator |
| 2023-11-07 | Quartz, respirable, >1% Qtz | 0.22 | 0.34 | 0.65 | Laborer, Bullgang |
| 2023-11-07 | Quartz, respirable, >1% Qtz | 0.16 | 0.3 | 0.53 | Laborer, Bullgang |
| 2023-06-07 | Quartz, respirable, >1% Qtz | 0.16 | 0.19 | 0.84 | Cutting Mach Helper |
| 2023-06-07 | Respirable dust, <.1mg | 0 | Cutting Mach Helper | ||
| 2020-09-23 | Quartz, respirable, >1% Qtz | 0.3 | 0.37 | 0.81 | Laborer, Bullgang |
| 2020-09-23 | Quartz, respirable, >1% Qtz | 0.35 | 0.43 | 0.81 | Laborer, Bullgang |
| 2018-10-23 | Respirable dust, <.1mg | 0 | Stone Polisher/Cutter | ||
| 2018-10-23 | Quartz, respirable, >1% Qtz | 0.18 | 0.23 | 0.78 | Stone Polisher/Cutter |
| 2018-10-23 | Quartz, respirable, >1% Qtz | 0.35 | 0.38 | 0.92 | Stone Polisher/Cutter |
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
- Sprague Stone LLC 2015 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
| Year | Employees |
|---|---|
| 2026 | 8 |
| 2025 | 9 |
| 2024 | 10 |
| 2023 | 11 |
| 2022 | 12 |
| 2021 | 16 |
| 2020 | 14 |
| 2019 | 13 |
| 2018 | 14 |
| 2017 | 14 |
| 2016 | 10 |
| 2015 | 6 |
Source: MSHA quarterly employment and production, updated weekly.
Sprague Stone LLC sits in Larimer County, Colorado, where the Census mining category is 0.6% 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.Larimer County, Colorado · Population 363,561
0.6%
Mining share of county employment
$91,364
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 | 3,190 | 2 | 0 | 627.0 |
| 2026 Q1 | 2,415 | 0 | 0 | 0.0 |
| 2025 Q4 | 4,119 | 0 | 0 | 0.0 |
| 2025 Q3 | 3,595 | 2 | 0 | 556.3 |
| 2025 Q2 | 2,953 | 0 | 0 | 0.0 |
| 2025 Q1 | 1,378 | 0 | 0 | 0.0 |
| 2024 Q4 | 3,401 | 3 | 0 | 882.1 |
| 2024 Q3 | 3,908 | 0 | 0 | 0.0 |
Show 35 earlier quarters Hide earlier quarters
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2024 Q1 | 3,084 | 0 | 0 | 0.0 |
| 2023 Q4 | 2,807 | 4 | 1 | 1425.0 |
| 2023 Q3 | 4,821 | 0 | 0 | 0.0 |
| 2023 Q2 | 4,116 | 3 | 1 | 728.9 |
| 2023 Q1 | 3,325 | 0 | 0 | 0.0 |
| 2022 Q4 | 4,512 | 0 | 0 | 0.0 |
| 2022 Q3 | 4,985 | 0 | 0 | 0.0 |
| 2022 Q2 | 3,922 | 2 | 0 | 509.9 |
| 2022 Q1 | 2,881 | 2 | 0 | 694.2 |
| 2021 Q4 | 3,452 | 0 | 0 | 0.0 |
| 2021 Q3 | 4,732 | 1 | 0 | 211.3 |
| 2021 Q2 | 4,206 | 0 | 0 | 0.0 |
| 2021 Q1 | 3,014 | 1 | 0 | 331.8 |
| 2020 Q4 | 4,805 | 0 | 0 | 0.0 |
| 2020 Q3 | 5,048 | 0 | 0 | 0.0 |
| 2020 Q2 | 4,291 | 0 | 0 | 0.0 |
| 2020 Q1 | 3,643 | 0 | 0 | 0.0 |
| 2019 Q4 | 3,463 | 0 | 0 | 0.0 |
| 2019 Q3 | 4,931 | 0 | 0 | 0.0 |
| 2019 Q2 | 4,527 | 0 | 0 | 0.0 |
| 2019 Q1 | 3,702 | 0 | 0 | 0.0 |
| 2018 Q4 | 5,008 | 0 | 0 | 0.0 |
| 2018 Q3 | 4,989 | 0 | 0 | 0.0 |
| 2018 Q2 | 4,745 | 0 | 0 | 0.0 |
| 2018 Q1 | 3,847 | 0 | 0 | 0.0 |
| 2017 Q4 | 4,397 | 0 | 0 | 0.0 |
| 2017 Q3 | 5,321 | 0 | 0 | 0.0 |
| 2017 Q2 | 5,475 | 19 | 1 | 3470.3 |
| 2017 Q1 | 3,952 | 0 | 0 | 0.0 |
| 2016 Q4 | 2,968 | 0 | 0 | 0.0 |
| 2016 Q3 | 2,653 | 0 | 0 | 0.0 |
| 2016 Q2 | 2,898 | 0 | 0 | 0.0 |
| 2016 Q1 | 2,260 | 0 | 0 | 0.0 |
| 2015 Q4 | 2,196 | 0 | 0 | 0.0 |
| 2015 Q3 | 156 | 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.