MINE DETAILS
ARGOS ROBERTA PLANT
MSHA MINE ID0100629
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- ARGOS ROBERTA PLANT33.16583, -86.62306Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-13. MSHA quarterly production and employment reports.
Coal production
0reported short tons
Hours worked
650,844reported employee hours
Tons per hour
0.00production ÷ hours worked
Missing values appear as —. Totals use available reports. Tons per hour requires production and hours for the same quarters and a nonzero hours total. * Striped bars mark partial mine coverage or an incomplete quarter. See the table for coverage.
Quarterly data and reporting coverage
| Quarter | Coal (short tons) | Hours worked | Tons / hour | Avg. employees | Coverage |
|---|---|---|---|---|---|
| 2025 Q1 | 0 | 112,160 | 0.00 | 165 | 1/1 mines reporting |
| 2025 Q2 | 0 | 125,893 | 0.00 | 171 | 1/1 mines reporting |
| 2025 Q3 | 0 | 120,086 | 0.00 | 175 | 1/1 mines reporting |
| 2025 Q4 | 0 | 118,503 | 0.00 | 197 | 1/1 mines reporting |
| 2026 Q1 | 0 | 103,754 | 0.00 | 197 | 1/1 mines reporting |
| 2026 Q2 | 0 | 70,448 | 0.00 | 196 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
7625 significant & substantial (S&S)
Accident records
70 records classified as fatality
Proposed penalties · USD
59,878.0076 of 76 violations with amounts
On-site inspection hours
244.5014 inspections · 14 with hours
Counts are published records, including contractor records. * The quarter was incomplete at the snapshot date; recent counts may rise as reports arrive. — means no reported amount or hours. Portfolio totals use current membership.
Quarterly safety data
| Quarter | Violations | S&S | Proposed USD | Accident records | Fatality records | Inspections | On-site hours |
|---|---|---|---|---|---|---|---|
| 2025-Q1 | 5 | 1 | 1,847.00 | 0 | 0 | 1 | 46.0 |
| 2025-Q2 | 41 | 19 | 33,304.00 | 0 | 0 | 4 | 68.0 |
| 2025-Q3 | 2 | 0 | 1,856.00 | 2 | 0 | 1 | 0.0 |
| 2025-Q4 | 0 | 0 | — | 0 | 0 | 2 | 9.0 |
| 2026-Q1 | 15 | 4 | 10,555.00 | 1 | 0 | 1 | 53.0 |
| 2026-Q2 | 3 | 1 | 3,739.00 | 1 | 0 | 3 | 18.5 |
| 2026-Q3 | 10 | 0 | 8,577.00 | 3 | 0 | 2 | 50.0 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
SLIP OR FALL OF PERSON · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Employee was fueling 390 excavator. Employee was dismounting and missed the bottom step and fell backwards, hitting their head on the ground resulting in a cut.
Compliance Follow-up Inspection · 2.8 on-site hours
56.14107(a) · $165.00 proposed
56.20003(a) · $3,184.00 proposed
56.11001 · $1,818.00 proposed
47.41(a)(1) · $151.00 proposed
56.4102 · $549.00 proposed
56.12019 · $549.00 proposed
46.3(a) · $245.00 proposed
56.13021 · $549.00 proposed
56.3200 · $549.00 proposed
56.14101(a)(2) · $818.00 proposed
Regular Safety and Health Inspection · 47.3 on-site hours
HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Employees was working on service truck crane and EE step down off the truck, following the three points of contact. When the employee placed EE's left foot on the step and shifted EE's weight over to that foot to finishing stepping down from the truck, the employee heard a pop and felt pain in their calf.
HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
On 7/09/2026, approximately at 1:15pm, an employee was working on the Chevy 2500 pickup truck to remove the bed. Employee said that EE hurt EE's knee while working under the truck.
Verbal Hazard Complaint Inspections · 12.5 on-site hours
56.14100(c) · S&S · $2,712.00 proposed
56.11001 · $818.00 proposed
SLIP OR FALL OF PERSON · DAYS AWAY FROM WORK ONLY
Accident narrative
Employee alleges EE stepped off a step and jarred EE's back. No unique conditions associated.
56.14105 · $209.00 proposed
103 (g) Written Notification Hazard Complaint Inspectio · 4.0 on-site hours
Compliance Follow-up Inspection · 2.0 on-site hours
56.20003(a) · $267.00 proposed
56.20003(a) · $267.00 proposed
56.14112(b) · S&S · $1,968.00 proposed
Safety sources and definitions
MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-13.
Counts describe published rows, including contractor records; accident records are not distinct incidents or numbers of people injured.
Zero means no matching records in the imported sources, not proof of no events. Historical coverage differs by source; absence before a source begins reporting is not a zero incident rate. Invalid or absent dates and records after the snapshot are excluded.
S&S means SIG_SUB=Y. Fatality records use DEGREE_INJURY_CD=01. Proposed penalties are not final assessed or paid amounts; missing dollar values are omitted.
Inspection hours are SUM_TOTAL_ON_SITE_HOURS attributed to the inspection start date, without supervisor/trainee hours. Missing hours are omitted; a started inspection may still be open.
Portfolio totals use current mine membership, including events before the current owner or operator's tenure.
CFR headings link to the current Title 30 index; they are not historical legal determinations.
OWNERSHIP
Operator and controller history
Current ownership comes from MSHA Mines. Historical start and end dates come from MSHA Controller and Operator History.
—
Quikrete Holdings Inc.controlsQuikrete Construction Materials, LLCoperatesARGOS ROBERTA PLANT
msha-controller-operator-history · controller/operator co-tenure derived on mine 0100629—
Summit Materials LLCcontrolsQuikrete Construction Materials, LLCoperatesARGOS ROBERTA PLANT
msha-controller-operator-history · controller/operator co-tenure derived on mine 0100629—
Holcim LtdcontrolsLafarge Building Materials IncorporatedoperatesARGOS ROBERTA PLANT
msha-controller-operator-history · controller/operator co-tenure derived on mine 0100629—
Cementos Argos S AcontrolsQuikrete Construction Materials, LLCoperatesARGOS ROBERTA PLANT
msha-controller-operator-history · controller/operator co-tenure derived on mine 0100629—
Lafarge S AcontrolsLafarge Building Materials IncorporatedoperatesARGOS ROBERTA PLANT
msha-controller-operator-history · controller/operator co-tenure derived on mine 0100629—
Blue Circle Industries PlccontrolsBlue Circle CementoperatesARGOS ROBERTA PLANT
msha-controller-operator-history · controller/operator co-tenure derived on mine 0100629—
Martin Marietta Materials InccontrolsMartin Marietta CementoperatesARGOS ROBERTA PLANT
msha-controller-operator-history · controller/operator co-tenure derived on mine 0100629Other historical summaries · source-specific periods
RECORD SUMMARY
Production, safety and enforcement
These summaries use the periods stated on each card, independently of the reporting period above.
01 / SAFETYwatch
Accidents and injuries
180 historical accident/injury rows; 1 coded fatalities and 1,826 lost days across the published record.
ACCIDENT + INJURY RECORD24 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
1,297 violation rows across the full record; 338 carry an S&S flag and $670,370 appears in current assessed amounts.
ENFORCEMENT ACTIVITY190 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
98 personal; 2 area. 3 personal-sample rows have a published C/E ratio above 1; 0 noise rows have an action-level or PEL dose above 100%. These are separate measures, not a silica exceedance count. Silica results and sample status are shown separately.
OCCUPATIONAL EXPOSURE100 samples
personal-health-samplesarea-samples04 / PRODUCTIONcontext
Quarterly production and employment
70K employee hours and 196 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
53 contested-violation rows, 51 civil-penalty docket/decision rows, and 44 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE148 linked rows
conferencescontested-violationscivil-penalty-dockets-decisions06 / CONTRACTORScontext
Contractors
Contractors are linked through this mine’s violation or accident records. Their production and hours cover all their operations, so they are not included in this mine’s totals.
ENTITY-LEVEL CONTEXT64 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
228 inspection events and 9K published inspection hours across the historical record.
OVERSIGHT COVERAGE39 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 10 silica records across the mine’s published history.
Personal silica samples · concentration / limit
Quarterly mean · published C/E ratio
— No eligible measurements. * Quarter in progress. Means describe the available samples, not average exposure across the mine.
Quartz % is the sample’s quartz content; µg/m³ is its reported concentration. Personal C/E is the ratio to the limit published with that sample. Personal and area concentration units and void status are not specified in those source files.
| Date / sample | Dataset / analyte | Occupation / area | Measurement | Sample status | Published action |
|---|---|---|---|---|---|
| No silica records match these filters. Missing samples do not establish safe conditions. | |||||
Sources and interpretation
- Coal means use numeric concentrations from samples marked not voided, excluding control/invalid sample types and dates after the snapshot. Missing values remain null; reported zeroes remain zero.
- Quarterly means describe available samples, not mine-wide or worker-average exposure. Quarters with no eligible measurements remain empty; the current quarter is partial.
- Personal C/E is MSHA's published concentration-to-limit ratio. A value above 1 is not by itself a citation or a determination under the 2024 silica rule. Personal and area files do not publish a void-status field.
- Area records include bulk-dust analyses and are kept separate from personal exposure results. Their concentration units are not specified in the source dictionary.
- Missing samples do not establish safe conditions. Coal quartz percentage and concentration are separate measures. No compliance threshold is inferred for coal samples.
Coal quartz field definitions ↗Metal/nonmetal personal field definitions ↗Metal/nonmetal area field definitions ↗
EIA + TITLE 30
EIA production and cited regulations
EIA annual figures are reported separately from MSHA. Regulation links use the current eCFR snapshot.
Not present in the 2024 EIA coal workbook.
This can mean the operation is non-coal, inactive for the annual period, or outside the EIA-7A reporting population.
30 CFR 56.14107Moving machine parts.1 recent row ↗30 CFR 56.20003Housekeeping.1 recent row ↗30 CFR 56.11001Safe access.2 recent rows ↗30 CFR 47.41Requirement for container labels.1 recent row ↗30 CFR 56.4102Spillage and leakage.1 recent row ↗30 CFR 56.12019Access to stationary electrical equipment or switchgear.1 recent row ↗30 CFR 46.3Training plans.1 recent row ↗30 CFR 56.13021High-pressure hose connections.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
519189356.14107(a)Citation
519189256.20003(a)Citation
519189156.11001Citation
519189047.41(a)(1)Citation
519188956.4102Citation
519188856.12019Citation
519188746.3(a)Citation
506419656.13021Citation
Coal dust, noise and other contaminants. Silica records above ↑
Respirable dust, <.1mgKiln/Dryer Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgKiln/Dryer Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzBagging Operator
C/E: 00.00Concentration: 0000.17 · limit: 0000.00Source unit unspecified
Nuisance dust, respirable, <1% QtzPackaging Operations Worker
C/E: 00.01Concentration: 0000.14 · limit: 0010.00Source unit unspecified
Respirable dust, <.1mgPackaging Operations Worker
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzBuilding Repair/Maint.
C/E: 00.00Concentration: 0000.13 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzCleanup Man
C/E: 00.00Concentration: 0000.14 · limit: 0000.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
16 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors180Jan 31, 2000—Sep 15, 2026mine-keyed
Addresses of Recordidentity · logistics1Feb 26, 1976—Feb 26, 1976mine-keyed
Assessed Violationscompliance · legal1,270Jan 24, 2000—Aug 5, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal51Jan 7, 2003—Oct 27, 2022mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal44Jun 26, 2000—Aug 12, 2025mine-keyed
Contested Violationscompliance · legal53May 4, 2005—Feb 15, 2022mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety7,311Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety1,574Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance7Jan 1, 1950—Oct 3, 2011mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance306Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance78Not published—Not publishedmine-keyed
Inspectionssafety · compliance228Jan 24, 2000—Aug 27, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety2May 31, 2024—May 31, 2024mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety98Mar 22, 2004—Sep 17, 2024mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal1,297Jan 24, 2000—Aug 5, 2026mine-keyed
107(a) Orders Issuedsafety · compliance—No published rowsabsent / not applicable
NOTES
Limitations
- Contractor production is entity-level and is never represented as mine-attributable.
- Missing rows can mean no event, publication delay, identity mismatch, or inapplicability.