Mining Incidents

Signal Peak Silica of Oakwood: 81 MSHA citations Metal/Non-Metal

Oakwood, Dewey County, OK  ·  Active
MSHA Mine ID: 3402178

Signal Peak Silica of Oakwood has $19K 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
15
Years on record
2018–2025
Latest incident
Mar 2025
Compliance record
MSHA citations since 2018
81
citations
13
significant & substantial
$18,936
proposed penalties
$18,936
paid to date
100% of proposed penalties paid to date, a $0 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2018
28
inspections on record
591
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: 591 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

Signal Peak Silica of Oakwood has $19K 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.
$19K
proposed penalties
$19K
current assessed
$19K
paid to date
$0
outstanding
78 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-05-19.
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.
16.0%
significant & substantial
3.7%
high negligence or reckless
16.0%
reasonably likely or greater
44.4%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 8.6% low, 87.7% moderate, 3.7% 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: 2025-09-03
67%
of limit-tested samples over the exposure limit
11
samples
3
limit-tested
Most sampled contaminants
  • Quartz, respirable, >1% Qtz42 over
  • Respirable dust, <.1mg7
Show the individual readings (11)
Date Contaminant Concentration Limit Conc / limit Occupation
2022-06-15 Quartz, respirable, >1% Qtz 0.4 0.4 1.00 Utility Man
2022-06-15 Quartz, respirable, >1% Qtz 0.45 0.38 1.18 Utility Man
2025-09-03 Respirable dust, <.1mg 0 Utility Man
2025-09-03 Quartz, respirable, >1% Qtz 0.16 0.57 0.28 Dry Screen Plant Operator
2025-09-03 Respirable dust, <.1mg 0 Front-end Loader Operator
2025-09-03 Respirable dust, <.1mg 0 Utility Man
2022-06-15 Respirable dust, <.1mg 0 Truck Loader
2022-06-15 Respirable dust, <.1mg 0 Truck Loader
2019-04-04 Respirable dust, <.1mg 0 Front-end Loader Operator
2019-04-04 Quartz, respirable, >1% Qtz 0.36 Truck Loader
2019-04-04 Respirable dust, <.1mg 0 Mechanic
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.

Signal Peak Silica of Oakwood recorded 0.97 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.
0.97
total case rate
0.00
days-away rate
0.000
fatality rate
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 Oklahoma, metal and nonmetal mining averaged 1.92 cases per 100 workers that year.
Year total case rate days-away fatal
2025 0.97 0.00 0.000
2024 1.33 0.00 0.000
2023 1.40 1.40 0.000
2022 3.12 0.00 0.000
2021 1.87 0.00 0.000
2020 * 2.13 0.00 0.000
2019 1.34 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.
Ownership history
  1. SP Silica of Oakwood, LLC 2018 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 109
2025 94
2024 70
2023 66
2022 61
2021 47
2020 51
2019 143
2018 79
Source: MSHA quarterly employment and production, updated weekly.

Signal Peak Silica of Oakwood sits in Dewey County, Oklahoma, where the Census mining category is 12.0% 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.
Dewey County, Oklahoma · Population 4,433
12.0%
Mining share of county employment
$60,550
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 59,826 3 0 50.1
2026 Q1 58,320 0 0 0.0
2025 Q4 62,031 4 0 64.5
2025 Q3 52,048 0 0 0.0
2025 Q2 47,294 5 0 105.7
2025 Q1 45,301 2 0 44.1
2024 Q4 39,034 0 0 0.0
2024 Q3 38,925 0 0 0.0
Show 25 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 35,620 3 0 84.2
2024 Q1 36,550 0 0 0.0
2023 Q4 37,176 2 0 53.8
2023 Q3 36,767 3 1 81.6
2023 Q2 35,087 0 0 0.0
2023 Q1 33,475 1 0 29.9
2022 Q4 30,948 0 0 0.0
2022 Q3 32,223 0 0 0.0
2022 Q2 32,357 3 2 92.7
2022 Q1 32,520 0 0 0.0
2021 Q4 34,826 0 0 0.0
2021 Q3 29,888 0 0 0.0
2021 Q2 24,698 0 0 0.0
2021 Q1 17,765 4 1 225.2
2020 Q4 9,915 0 0 0.0
2020 Q3 6,479 0 0 0.0
2020 Q2 24,339 0 0 0.0
2020 Q1 53,193 3 0 56.4
2019 Q4 67,632 0 0 0.0
2019 Q3 81,104 0 0 0.0
2019 Q2 77,171 13 3 168.5
2019 Q1 73,193 0 0 0.0
2018 Q4 81,609 2 0 24.5
2018 Q3 29,400 6 0 204.1
2018 Q2 6,335 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

15 on file

2025 · 1 incident

March 28, 2025 OK · Metal/Non-Metal ground controller SLIP OR FALL OF PERSON
SP Silica of Oakwood, LLC · Fall onto or against objects

A mine employee was ascending the line 100 Rotex stairs, when employee's right foot got caught between the steps which caused employee to fall and strike mouth against a step. Injury resulted in four sutures and caused a chipped central incisor tooth.

2024 · 2 incidents

November 14, 2024 OK · Metal/Non-Metal outside foreman, leadman POWERED HAULAGE
SP Silica of Oakwood, LLC · Struck by falling object

Dry Plant employee was conducting a walkaround when sand coming from the 3886 BC got into EE's right eye. The eye was flushed with water and saline, but the employee continued to feel irritation and requested further medical evaluation at the end of EE's shift. The employee was treated and released to work but was given a prescription for treatment.

September 14, 2024 OK · Metal/Non-Metal assayer, geologist, metallurgist, engineer, engineer management HANDTOOLS (NONPOWERED)
SP Silica of Oakwood, LLC · Struck by... (Not Elsewhere Classified)

EE cutting off Wire tie from Extension cord. Using incorrect tool (Pocket knife) slipped and cut left Pinky finger

2023 · 1 incident

July 19, 2023 OK · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech OTHER
SP Silica of Oakwood, LLC · Bodily reaction, (Not Elsewhere Classified)

Injured employee bent/knelt down to insert a bolt into a Rotex beam when they felt pain in thier left knee. Initial diagnosis was/is a sprained left knee, the employee was placed under work restrictions.

2022 · 2 incidents

December 28, 2022 OK · Metal/Non-Metal dryer operator, kiln operator, dry plant operator, fluid operator, bed dryer operator POWERED HAULAGE
SP Silica of Oakwood, LLC · Caught in, under or between a moving and a stationary object

The injured employee was using a Compact Utility Loader to clean up under a feed hopper conveyor belt when EE caught left index finger between the controls handle of the loader and belt structure causing a laceration that required 6 sutures.

December 15, 2022 OK · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech OTHER
SP Silica of Oakwood, LLC · Struck by flying object

The injured employee was standing in the maintenance shop when a grain of sand blew into left eye around employee's safety glasses. The employee flushed the eye several times. On December 17th the eye was still irritated, so employee went to the emergency room for further medical treatment. No object was found embedded, but was prescribed eye drops for treatment.

2021 · 1 incident

April 13, 2021 OK · Metal/Non-Metal outside foreman, leadman SLIP OR FALL OF PERSON
SP Silica of Oakwood, LLC · Over-exertion (Not Elsewhere Classified)

An employee was injured while descending the stairs from the rotex deck at the Dry Plant. EE was maintaining three points of contact but lost EE's balance towards the bottom of the steps causing EE to tighten EE's grip on the handrail injuring EE's right shoulder. The employee was diagnosed with a dislocated shoulder.

2020 · 1 incident

January 7, 2020 OK · Metal/Non-Metal utility man, shift tech, service/dump truck operator SLIP OR FALL OF PERSON
SP Silica of Oakwood, LLC · Fall down stairs

On 01/07/20 while descending the steps from the primary screener, the employee slipped and fell, striking lower back. Employee did not seek medical attention at the time. On 2/3 the employee sought medical attention for aggravation of this injury, and was placed on restricted work duty. Freezing rain that morning was a factor in this incident.

2019 · 2 incidents

May 18, 2019 OK · Metal/Non-Metal prep plant foreman, supervisor, mill plant supervisor, kiln supervisor HANDLING OF MATERIALS
SP Silica of Oakwood, LLC · Struck against stationary object

Employee was closing a gate valve, at the head box of primary screen. While closing the valve, EE struck left elbow on the flange of the top rail of the head box, causing a laceration that required two sutures. Management was notified on 5-20-19 that the employee received sutures due to this incident.

April 6, 2019 OK · Metal/Non-Metal utility man, shift tech, service/dump truck operator HANDLING OF MATERIALS
SP Silica of Oakwood, LLC · Over-exertion in pulling or pushing objects

Muck build up from waste belt under tail pulley. EE was hosing out from under the belt, foot became stuck in the muck, when ee pulled on leg to get out of the muck, and knee popped causing pain. EE wanted to have knee checked out. Was given immobilizer.

2018 · 5 incidents

October 11, 2018 OK · Metal/Non-Metal electrician, lineman MACHINERY
SP Silica of Oakwood, LLC · Caught in, under or between a moving and a stationary object

An employee was working with a Southwire M6K Maxis to pull wire. The individual got the left little finger caught in the rope; the employee couldn't get finger out or shut the tool off in time, amputating the top of the employees' fifth digit.

September 8, 2018 OK · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
SP Silica of Oakwood, LLC · Fall to the walkway or working surface

Miner was cleaning/shoveling excess feed from the around the mobile rinser, loader operator placed material into hopper when a compacted segment slid from grizzly grid striking miner. Miner lost EE's balance / footing falling to the ground. During chain of events after being struck and coming to rest on the ground, miner sustained a fractured femur on EE's left leg.

July 17, 2018 OK · Metal/Non-Metal plumber, pipefitter, millwright HANDTOOLS (NONPOWERED)
SP Silica of Oakwood, LLC · Struck by... (Not Elsewhere Classified)

Employee was aligning two pipe flanges using a Spud wrench. After spiking the bolt hole of one the flanges attempted to align the two flanges by pulling on the spud wrench. The spud wrench came out of the bolt hole striking the employee on the bridge of the nose.

June 28, 2018 OK · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
SP Silica of Oakwood, LLC · Fall from machine

Crane mechanic was working on the Link Belt Crane pulling the air cleaner. EE stepped back thinking EE was stepping onto the main deck from the catwalk. EE miss-stepped, missing the main deck and fell to the ground level. EE was not wearing fall protection.