MINE DETAILS

LEER MINE

ActiveUndergroundCoal (Bituminous)

MSHA MINE ID4609192

OPERATORICG TYGART VALLEY

CONTROLLERCore Natural Resources Inc

LOCATIONTaylor, WV

PUBLIC RECORD36,596 linked rows

LOCATION

Mine location

1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.

Mine coordinates

LEER MINE39.33111, -79.95861Open map ↗

Quarterly trends

2025 Q1 – 2026 Q4

JSON CSV

Database snapshot · 2026-10-13. MSHA quarterly production and employment reports.

Coal production

6,991,302

reported short tons

2025 Q11,376,846
2025 Q21,403,008
2025 Q31,377,455
2025 Q41,140,206
2026 Q1778,733
2026 Q2915,054
2026 Q3—No usable value reported
2026 Q4 *—No usable value reported

Hours worked

1,840,279

reported employee hours

2025 Q1351,098
2025 Q2326,627
2025 Q3311,698
2025 Q4298,267
2026 Q1290,135
2026 Q2262,454
2026 Q3—No usable value reported
2026 Q4 *—No usable value reported

Tons per hour

3.80

production ÷ hours worked

2025 Q13.92
2025 Q24.30
2025 Q34.42
2025 Q43.82
2026 Q12.68
2026 Q23.49
2026 Q3—No usable value reported
2026 Q4 *—No usable value reported

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

Quarterly production, employment and reporting coverage for LEER MINE
Quarter	Coal (short tons)	Hours worked	Tons / hour	Avg. employees	Coverage
2025 Q1	1,376,846	351,098	3.92	567	1/1 mines reporting
2025 Q2	1,403,008	326,627	4.30	491	1/1 mines reporting
2025 Q3	1,377,455	311,698	4.42	485	1/1 mines reporting
2025 Q4	1,140,206	298,267	3.82	462	1/1 mines reporting
2026 Q1	778,733	290,135	2.68	455	1/1 mines reporting
2026 Q2	915,054	262,454	3.49	437	1/1 mines reporting
2026 Q3	—	—	—	—	No report
2026 Q4	—	—	—	—	No report

Safety and enforcement

2025-01-01 – 2026-10-13

Violations

423

62 significant & substantial (S&S)

2025 Q161
2025 Q260
2025 Q367
2025 Q459
2026 Q1101
2026 Q236
2026 Q338
2026 Q4 *1

Accident records

0 records classified as fatality

2025 Q11
2025 Q26
2025 Q34
2025 Q45
2026 Q13
2026 Q26
2026 Q37
2026 Q4 *0

Proposed penalties · USD

273,199.00

404 of 423 violations with amounts

2025 Q175,305
2025 Q237,129
2025 Q338,291
2025 Q444,804
2026 Q141,595
2026 Q216,590
2026 Q319,485
2026 Q4 *—

On-site inspection hours

4,372.00

181 inspections · 181 with hours

2025 Q1619.25
2025 Q2725.50
2025 Q3771.50
2025 Q4610.50
2026 Q1672.25
2026 Q2482.25
2026 Q3483.25
2026 Q4 *7.50

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	Inspections	On-site hours
2025-Q1	61	5	75,305.00	1	24	619.3
2025-Q2	60	10	37,129.00	6	25	725.5
2025-Q3	67	12	38,291.00	4	30	771.5
2025-Q4	59	10	44,804.00	5	21	610.5
2026-Q1	101	9	41,595.00	3	28	672.3
2026-Q2	36	8	16,590.00	6	25	482.3
2026-Q3	38	8	19,485.00	7	26	483.3
2026-Q4 *	1	0	—	0	2	7.5

Most cited CFR sections

All violations issued in the selected period. Counts combine subsections.

Section	Violations	S&S
30 CFR 75.400Accumulation of combustible materials.	54	12
30 CFR 75.1403Other safeguards.	50	6
30 CFR 75.370Mine ventilation plan; submission and approval.	35	3
30 CFR 75.380Escapeways; bituminous and lignite mines.	27	8
30 CFR 75.1731Maintenance of belt conveyors and belt conveyor entries.	21	0
30 CFR 75.517Power wires and cables; insulation and protection.	19	14
Not reported	19	0
30 CFR 75.333Ventilation controls.	14	0
30 CFR 75.360Preshift examination at fixed intervals.	11	0
30 CFR 75.403Maintenance of incombustible content of rock dust.	11	0

Safety activity

inspection2026-10-07F02678B
103(i) Spot Inspections · 0.0 on-site hours
violation2026-10-079939477
75.333(d)(3)
inspection2026-10-01F02678A
Regular Safety and Health Inspection · 7.5 on-site hours
inspection2026-09-30F013FDF
Roof Control Technical Investigation · 7.5 on-site hours
inspection2026-09-30F02467B
103(i) Spot Inspections · 7.5 on-site hours
inspection2026-09-29F0166CA
Spot Inspection · 5.0 on-site hours
inspection2026-09-25F02467A
103(i) Spot Inspections · 6.3 on-site hours
accident2026-09-19220262740012
HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
IE was lifting a belt roller into a mantrip. It slipped out of EE's hands and EE attempted to catch it. As EE did so, EE's finger was caught between two rollers. The injury was reported after finishing midnight shift (9/20/26) Injury was not the result of a training or compliance issue.
inspection2026-09-18F024677
103(i) Spot Inspections · 8.0 on-site hours
violation2026-09-188046855
75.1403-6(b)(3)
violation2026-09-168046854
75.363(a)
violation2026-09-168046853
75.1403
inspection2026-09-15F024675
103(i) Spot Inspections · 7.5 on-site hours
inspection2026-09-10F024674
103(i) Spot Inspections · 8.0 on-site hours
violation2026-09-108046852
75.1403
violation2026-09-099930789
75.1002(a)
violation2026-09-099188279
75.1002(a)
violation2026-09-099188278
75.1002(a)
violation2026-09-099188277
75.1107-16-b
violation2026-09-099188276
75.220(a)(1)
inspection2026-09-04F024673
103(i) Spot Inspections · 6.0 on-site hours
violation2026-09-048046851
75.403
inspection2026-08-31F024672
103(i) Spot Inspections · 6.3 on-site hours
violation2026-08-279188273
75.1600-2(e) · $193.00 proposed
violation2026-08-279188272
Description not reported · $775.00 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.

EIA-923 · COAL RECEIPTS

Coal shipments and quality

Receipts reported by power plants and terminals, matched by MSHA mine ID.

REPORTED RECEIPTS · SHORT TONS—0 rows · 0 receiving plants

HEAT CONTENT · BTU/LB—Weighted by reported tons

SULFUR / ASH · % BY WEIGHT— / —Separate averages over measured receipts

DELIVERED COST · USD/TON—No price coverage

No receipts matched this mine in the selected period. EIA-923 does not cover all mine sales, exports or metallurgical coal shipments.

Delivered cost includes transport and is not mine revenue. Missing prices remain blank. * Fewer than three months are published in the selected quarter. Receipts reflect the months EIA has published; an unfinished quarter is not comparable with a full quarter. Portfolio matches use current ownership.

Coverage, sources and calculations

Reported coal receipts at EIA-923 power plants/terminals; this is not a census of mine shipments, exports or metallurgical sales.
Matches use only the published MSHA ID, normalized to seven digits. Unidentified mine origins remain in the source table but are not assigned to a mine.
Portfolio attribution uses current MSHA ownership, not ownership at the shipment date. Receipts and production can differ because of timing, stocks and coverage.
Quality means are weighted by positive reported tons with that measurement. Delivered cost uses only rows with published cost, positive heat and positive tons; missing/withheld costs are never zero-filled.
USD/ton = (cents/MMBtu ÷ 100) × MMBtu/ton. This is plant delivered cost, not mine sales price or revenue.
Receipt month is as published, including records supplied by annual respondents. Recent months are preliminary and subject to revision. Missing rows do not prove zero shipments.

Imported releases start 2008-01. This window includes 12 published months. EIA releases · Survey instructions

2026 · preliminary · EIA923_Schedules_2_3_4_5_M_07_2026_21SEP2026.xlsx · Page 5 Fuel Receipts and Costs
2025 · final · EIA923_Schedules_2_3_4_5_M_12_2025_Final.xlsx · Page 5 Fuel Receipts and Costs

EIA ANNUAL COAL REPORT · 2024

Coal prices and estimated revenue

Annual county prices and a production-based allocation of county coal sales.

FOB PRICE BENCHMARK · USD/TON—Published county average

ESTIMATED SALES · SHORT TONS—Allocated from published county sales

ESTIMATED COAL REVENUE · USD—Covered mines only · not reported revenue

ANNUAL PRODUCTION COVERED0.0%0 of 1 producing annual mine records

The estimate assumes each eligible mine receives its county-average price and shares county sales in proportion to production. Actual sales and prices can differ substantially. Unavailable estimates are excluded; this is not a total for the whole portfolio. Annual price data uses a separate window from the MSHA charts.

Mine / county	Annual production · tons	County FOB · USD/ton	Est. sales · tons	Est. coal revenue · USD	Basis / availability
Leer Mine4609192 · Taylor, West Virginia	3,650,142	—	—	—	County sales or price not published1 eligible mines / 1 sales respondents

Method, assumptions and source records

This is an annual county-sales allocation, not reported mine or company revenue. Currency is nominal USD in the source year; quantities are short tons.
Mine share = same-year annual mine production / eligible same-county production. Estimated sales = published county sales × share. Estimated coal revenue = estimated sales × published county average FOB price.
The model assumes eligible mines share county sales in proportion to production and receive the county-average price. Matching mine counts is a check, not proof of identical respondents. Mine quality, contracts and sales timing can differ substantially. No statistical confidence interval is implied.
FOB excludes transport and insurance. EIA-923 delivered costs do not enter this model. No grade premium, state/national fallback, quarterly apportionment or carry-forward to a later year is applied.
Eligibility follows the source's production threshold and excludes preparation-only and refuse operations. Withheld values, inconsistent county counts and missing/ambiguous locations produce no estimate.
County sales are published in thousands of tons and prices to cents. Calculations retain precision, but the inputs are rounded and the allocation is approximate.
Portfolio attribution uses current MSHA ownership, not ownership during the sales year. Covered-mine sums exclude unavailable estimates and must not be read as whole-company revenue. Coverage denominators use the annual EIA mine-production release.

Sales-reporting threshold: 50,000 short tons per mine in 2024. Withheld sales or prices stay unavailable.

EIA Table 30 · county sales and FOB prices · EIA annual mine production · Release index

Annual report released November 19, 2025. Method: county-sales-allocation-v1. JSON and CSV preserve source row numbers and file checksums.

OWNERSHIP

Operator and controller history

Current ownership comes from MSHA Mines. Historical start and end dates come from MSHA Controller and Operator History.

CURRENT HIERARCHYCore Natural Resources Inc → ICG TYGART VALLEY → LEER MINE

HISTORY RECORDS37 relationships

INTERVAL CHECKPASScontroller/operator overlap

Jan 14, 2025—CURRENT / OPEN

Core Natural Resources InccontrolsICG Tygart ValleyoperatesLEER MINE

msha-controller-operator-history · controller/operator co-tenure derived on mine 4609192

Jun 15, 2011—Jan 13, 2025

Arch Resources InccontrolsICG Tygart ValleyoperatesLEER MINE

msha-controller-operator-history · controller/operator co-tenure derived on mine 4609192

Jan 23, 2007—Jun 14, 2011

International Coal Group Inc (ICG)controlsICG Tygart ValleyoperatesLEER MINE

msha-controller-operator-history · controller/operator co-tenure derived on mine 4609192

Other 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

139 historical accident/injury rows; 3 coded fatalities and 6,919 lost days across the published record.

ACCIDENT + INJURY RECORD57 since 2021

accidentsmine-production-quarterly

02 / COMPLIANCEwatch

Violations and penalties

4,213 violation rows across the full record; 901 carry an S&S flag and $2,530,419 appears in current assessed amounts.

ENFORCEMENT ACTIVITY1,119 since 2021

inspectionsviolationsassessed-violationsorders-107a

03 / HEALTHwatch

Occupational health samples

17,908 coal dust; 605 coal quartz; 600 noise. 0 personal-sample rows have a published C/E ratio above 1; 158 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 EXPOSURE19K samples

coal-dust-samplesquartz-samplesnoise-samples

04 / PRODUCTIONcontext

Quarterly production and employment

262K employee hours and 437 summed average employees across reported subunits in the latest published quarter.

2026-Q2915K tons

mine-production-quarterlymine-production-yearly

05 / LEGALwatch

Contests, conferences and decisions

713 contested-violation rows, 713 civil-penalty docket/decision rows, and 181 conference records linked by issuance number.

POST-ISSUANCE LIFECYCLE1,607 linked rows

conferencescontested-violationscivil-penalty-dockets-decisions

06 / 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 CONTEXT21 linked entities

contractor-production-quarterlycontractor-production-yearlyaccidentsviolations

07 / INSPECTIONScontext

Inspections

1,495 inspection events and 60K published inspection hours across the historical record.

OVERSIGHT COVERAGE593 since 2021

inspectionsviolations

HEALTH SAMPLING

Silica and quartz

Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 605 silica records across the mine’s published history.

Matching records4444 coal · 0 personal · 0 area

Sample status41 not voided3 voided · 0 status not reported

Mean coal quartz concentration14.85 µg/m³41 eligible measurements · 0 missing concentration

Coal quartz concentration

Quarterly mean · µg/m³ · not-voided samples

2026-Q11815 measurements
2026-Q216.9314 measurements
2026-Q38.512 measurements
2026-Q4*—0 measurements

— 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.

2026 · Jan 6, 2026–Sep 1, 2026
Date / sample	Dataset / analyte	Occupation / area	Measurement	Sample status	Published action
Sep 1, 202658601124 / lab 2026036558	Coal quartzQuartz	OCCUPATION CODE NOT FOUNDINTAKE AIR	0 µg/m³—% quartz	VoidedINVALID SAMPLE TYPE	Not reported
Sep 1, 202658600744 / lab 2026036559	Coal quartzQuartz	LONGWALL OPERATOR (HEADGATE SIDE)DESIGNATED OCCUPATION	16 µg/m³1.6% quartz	Not voided	Not reported
Sep 1, 202658600732 / lab 2026036560	Coal quartzQuartz	MECHANICNON DESIGNATED OCCUPATION	4 µg/m³0.6% quartz	Not voided	Not reported
Sep 1, 202658601200 / lab 2026036561	Coal quartzQuartz	JACK SETTER (LONGWALL)NON DESIGNATED OCCUPATION	10 µg/m³1% quartz	Not voided	Not reported
Aug 27, 202658601312 / lab 2026035805	Coal quartzQuartz	ROOF BOLTER (TWIN HEAD) (RETURN SIDE)NON DESIGNATED OCCUPATION	9 µg/m³5.3% quartz	Not voided	Not reported
Aug 27, 202658601098 / lab 2026035800	Coal quartzQuartz	OCCUPATION CODE NOT FOUNDINTAKE AIR	1 µg/m³0.7% quartz	Not voided	Not reported
Aug 27, 202658601094 / lab 2026035804	Coal quartzQuartz	CONTINUOUS MINER OPERATORDESIGNATED OCCUPATION	4 µg/m³2.2% quartz	Not voided	Not reported
Aug 7, 202658600746 / lab 2026032448	Coal quartzQuartz	OCCUPATION CODE NOT FOUNDINTAKE AIR	1 µg/m³0.6% quartz	Not voided	Not reported
Aug 7, 202658601222 / lab 2026032445	Coal quartzQuartz	ROOF BOLTER (TWIN HEAD) (RETURN SIDE)NON DESIGNATED OCCUPATION	24 µg/m³4.9% quartz	Not voided	Not reported
Aug 7, 202658600731 / lab 2026032442	Coal quartzQuartz	CONTINUOUS MINER OPERATORDESIGNATED OCCUPATION	21 µg/m³4.3% quartz	Not voided	Not reported
Jul 22, 202658601313 / lab 2026030499	Coal quartzQuartz	OCCUPATION CODE NOT FOUNDDESIGNATED AREA	1 µg/m³0.2% quartz	Not voided	Not reported
Jul 22, 202658599654 / lab 2026030504	Coal quartzQuartz	CONTINUOUS MINER OPERATORDESIGNATED OCCUPATION	5 µg/m³1.2% quartz	Not voided	Not reported
Jul 22, 202658599637 / lab 2026030498	Coal quartzQuartz	ROOF BOLTER (TWIN HEAD) (RETURN SIDE)NON DESIGNATED OCCUPATION	6 µg/m³1.7% quartz	Not voided	Not reported
Apr 28, 202658565334 / lab 2026018504	Coal quartzQuartz	CONTINUOUS MINER OPERATORDESIGNATED OCCUPATION	11 µg/m³4.8% quartz	Not voided	Not reported
Apr 28, 202658565599 / lab 2026018505	Coal quartzQuartz	ROOF BOLTER (TWIN HEAD) (RETURN SIDE)NON DESIGNATED OCCUPATION	39 µg/m³7.1% quartz	Not voided	Not reported
Apr 26, 202658565601 / lab 2026017984	Coal quartzQuartz	OCCUPATION CODE NOT FOUNDINTAKE AIR	4 µg/m³1.8% quartz	Not voided	Not reported
Apr 26, 202658565647 / lab 2026017981	Coal quartzQuartz	ROOF BOLTER (TWIN HEAD) (RETURN SIDE)NON DESIGNATED OCCUPATION	11 µg/m³2.9% quartz	Not voided	Not reported
Apr 26, 202658565341 / lab 2026017982	Coal quartzQuartz	CONTINUOUS MINER OPERATORDESIGNATED OCCUPATION	11 µg/m³3.2% quartz	Not voided	Not reported
Apr 23, 202658565579 / lab 2026017357	Coal quartzQuartz	ROOF BOLTER (TWIN HEAD) (RETURN SIDE)NON DESIGNATED OCCUPATION	40 µg/m³6.9% quartz	Not voided	Not reported
Apr 23, 202658565695 / lab 2026017355	Coal quartzQuartz	CONTINUOUS MINER OPERATORDESIGNATED OCCUPATION	43 µg/m³3.9% quartz	Not voided	Not reported

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.

EIA MINE CONTEXT2024 record

ANNUAL COAL PRODUCTION3,650,142short tons

LABOR HOURS: 1,323,744
AVG EMPLOYEES: 520
SUPPLY REGION: Appalachia Northern
UNION: No union code published
OPERATION: Mine only
COMPANY TYPE: Operating Subsidiary

1 published EIA row aggregated under this MSHA ID. Components remain available in JSON.

TITLE 30 CROSSWALKCurrent through 2026-08-19

30 CFR 75.333Ventilation controls.1 recent row ↗30 CFR 75.1403-6Criteria—Self-propelled personnel carriers.1 recent row ↗30 CFR 75.363Hazardous conditions and violations of mandatory health or safety standards; posting, correcting, and recording.1 recent row ↗30 CFR 75.1403Other safeguards.2 recent rows ↗30 CFR 75.1002Installation of electric equipment and conductors; permissibility.3 recent rows ↗30 CFR 75.1107-16Inspection of fire suppression devices.1 recent row ↗30 CFR 75.220Roof control plan.1 recent row ↗30 CFR 75.403Maintenance of incombustible content of rock dust.1 recent row ↗

RECENT PUBLIC RECORDS

Recent violations and samples

Latest records retained for inspection; aggregates above use the full source history.

VIOLATIONS12 latest shown

Oct 7, 2026993947775.333(d)(3)Citation

Sep 18, 2026804685575.1403-6(b)(3)Citation

Sep 16, 2026804685475.363(a)Citation

Sep 16, 2026804685375.1403Citation

Sep 10, 2026804685275.1403Citation

Sep 9, 2026993078975.1002(a)Citation

Sep 9, 2026918827975.1002(a)Citation

Sep 9, 2026918827875.1002(a)Citation

OTHER HEALTH SAMPLES8 latest shown

Coal dust, noise and other contaminants. Silica records above ↑

Oct 8, 2026