ALL STATUSES / CONTROLLER PORTFOLIO

Kiewit Peter Sons' Inc

Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.

MSHA CONTROLLER IDC02111

MINE PORTFOLIO

5 of 5 mines and facilities

2025-01-01 – 2026-10-17. All statuses records; production reporting is not required.

Material, method and type filters apply to this table. The portfolio’s status applies to the entire page. GEM fields describe their own release, not the selected MSHA year.

Mine	Location / type	Coal · short tons	Hours worked	Violations	Accident records	On-site inspection hours
Buckskin Mine4801200 · Active	Campbell, WYSurface · MSHA: Coal (Bituminous)	—	—	34	2	274.3
Grindstone4105586 · Active	Palo Pinto, TXSurface · MSHA: Crushed, Broken Limestone NEC	—	—	26	2	51.0
Big Horn Coal Co4800090 · Abandoned	Sheridan, WYSurface · MSHA: Coal (Bituminous)	—	—	0	0	—
Colowyo Mine0502962 · NonProducing	Moffat, COSurface · MSHA: Coal (Bituminous)	—	—	13	7	322.5
Rosebud Coal Sales Company4800084 · Abandoned and Sealed	Carbon, WYSurface · MSHA: Coal (Bituminous)	—	—	0	0	—

Production and hours sum available quarterly reports. — means unavailable; zero safety records means none in the selected imported period. Ownership reflects the current MSHA record.

LOCATION

Portfolio map

5 of 5 mines with usable MSHA coordinates. Select a marker to open a mine.

Mine coordinates

Buckskin Mine44.43361, -105.52861Open map ↗
Grindstone32.58444, -98.11306Open map ↗
Big Horn Coal Co44.91667, -106.95000Open map ↗
Colowyo Mine40.29972, -107.78306Open map ↗
Rosebud Coal Sales Company41.90000, -106.55000Open map ↗

Quarterly trends

2025 Q1 – 2026 Q4

JSON CSV

Database snapshot · 2026-10-17. All 5 mines listed under this controller were checked; 0 have reports in the available quarters. Totals use current ownership.

Coal production

—

reported short tons

2025 Q1—No usable value reported
2025 Q2—No usable value reported
2025 Q3—No usable value reported
2025 Q4—No usable value reported
2026 Q1—No usable value reported
2026 Q2—No usable value reported
2026 Q3—No usable value reported
2026 Q4 *—No usable value reported

Hours worked

—

reported employee hours

2025 Q1—No usable value reported
2025 Q2—No usable value reported
2025 Q3—No usable value reported
2025 Q4—No usable value reported
2026 Q1—No usable value reported
2026 Q2—No usable value reported
2026 Q3—No usable value reported
2026 Q4 *—No usable value reported

Tons per hour

—

production ÷ hours worked

2025 Q1—No usable value reported
2025 Q2—No usable value reported
2025 Q3—No usable value reported
2025 Q4—No usable value reported
2026 Q1—No usable value reported
2026 Q2—No usable value reported
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 Kiewit Peter Sons' Inc
Quarter	Coal (short tons)	Hours worked	Tons / hour	Avg. employees	Coverage
2025 Q1	—	—	—	—	No report
2025 Q2	—	—	—	—	No report
2025 Q3	—	—	—	—	No report
2025 Q4	—	—	—	—	No report
2026 Q1	—	—	—	—	No report
2026 Q2	—	—	—	—	No report
2026 Q3	—	—	—	—	No report
2026 Q4	—	—	—	—	No report

Safety and enforcement

2025-01-01 – 2026-10-17

Violations

13 significant & substantial (S&S)

2025 Q18
2025 Q21
2025 Q317
2025 Q47
2026 Q112
2026 Q211
2026 Q317
2026 Q4 *0

Accident records

0 records classified as fatality

2025 Q11
2025 Q24
2025 Q33
2025 Q41
2026 Q11
2026 Q20
2026 Q31
2026 Q4 *0

Proposed penalties · USD

26,785.00

62 of 73 violations with amounts

2025 Q11,324
2025 Q21,320
2025 Q39,798
2025 Q41,547
2026 Q17,818
2026 Q23,921
2026 Q31,057
2026 Q4 *—

On-site inspection hours

647.75

19 inspections · 19 with hours

2025 Q1113.50
2025 Q2100.75
2025 Q389.50
2025 Q416.50
2026 Q1151.50
2026 Q223.50
2026 Q3145.25
2026 Q4 *7.25

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	8	0	1,324.00	1	2	113.5
2025-Q2	1	1	1,320.00	4	4	100.8
2025-Q3	17	5	9,798.00	3	2	89.5
2025-Q4	7	1	1,547.00	1	2	16.5
2026-Q1	12	2	7,818.00	1	3	151.5
2026-Q2	11	2	3,921.00	0	2	23.5
2026-Q3	17	2	1,057.00	1	3	145.3
2026-Q4 *	0	0	—	0	1	7.3

Most cited CFR sections

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

Section	Violations	S&S
30 CFR 77.1110Examination and maintenance of firefighting equipment.	9	0
30 CFR 77.404Machinery and equipment; operation and maintenance.	7	3
30 CFR 56.12004Electrical conductors.	4	0
30 CFR 77.1104Accumulations of combustible materials.	4	2
30 CFR 50.30Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.	3	0
30 CFR 56.14100Safety defects; examination, correction and records.	3	0
30 CFR 77.502Electric equipment; examination, testing, and maintenance.	3	0
30 CFR 56.20003Housekeeping.	2	1
30 CFR 56.4201Inspection.	2	0
30 CFR 77.1605Loading and haulage equipment; installations.	2	2

Safety activity

inspection2026-10-08F033D04
Colowyo Mine · 0502962
Verbal Hazard Complaint Inspections · 7.3 on-site hours
violation2026-09-255034574
Buckskin Mine · 4801200
77.404(a)
violation2026-09-245033804
Buckskin Mine · 4801200
77.1104 · S&S
violation2026-09-245033803
Buckskin Mine · 4801200
77.410(b)
violation2026-09-245033802
Buckskin Mine · 4801200
77.1104 · S&S
violation2026-09-235033801
Buckskin Mine · 4801200
77.512
violation2026-09-235033800
Buckskin Mine · 4801200
77.1303(g)
violation2026-09-215033799
Buckskin Mine · 4801200
77.904
violation2026-09-145034569
Buckskin Mine · 4801200
77.807
violation2026-09-145033798
Buckskin Mine · 4801200
77.904
violation2026-09-145033797
Buckskin Mine · 4801200
77.1101(c)
accident2026-09-12220262610001
Colowyo Mine · 0502962
HANDTOOLS (NONPOWERED) · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
pulling/cutting liner. forgot blade was not retracted. cut arm above the wrist.
inspection2026-09-09F010EF7
Buckskin Mine · 4801200
Regular Safety and Health Inspection · 92.8 on-site hours
violation2026-08-055031256
Colowyo Mine · 0502962
77.1102 · $151.00 proposed
violation2026-08-055031255
Colowyo Mine · 0502962
77.404(a) · $151.00 proposed
violation2026-08-045031254
Colowyo Mine · 0502962
77.1110 · $151.00 proposed
violation2026-07-225031253
Colowyo Mine · 0502962
77.1110 · $151.00 proposed
violation2026-07-225031252
Colowyo Mine · 0502962
77.502 · $151.00 proposed
violation2026-07-215031251
Colowyo Mine · 0502962
77.1110 · $151.00 proposed
inspection2026-07-16F0196FC
Colowyo Mine · 0502962
Regular Safety and Health Inspection · 52.5 on-site hours
inspection2026-07-16F0196FD
Colowyo Mine · 0502962
Verbal Hazard Complaint Inspections · 0.0 on-site hours
violation2026-07-165031250
Colowyo Mine · 0502962
77.404(a) · $151.00 proposed
violation2026-06-165173598
Grindstone · 4105586
56.14100(b) · $151.00 proposed
violation2026-06-165173597
Grindstone · 4105586
56.14107(a) · $209.00 proposed
violation2026-06-165173596
Grindstone · 4105586
56.4201(a)(1) · $209.00 proposed

Safety sources and definitions

MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-17.

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 TONS6,015,80185 rows · 8 receiving plants

HEAT CONTENT · BTU/LB8,503Weighted by reported tons

SULFUR / ASH · % BY WEIGHT0.33 / 5.34Separate averages over measured receipts

DELIVERED COST · USD/TON51.8544.8% of reported tons have usable costs

Quarterly receipts and quality

Quarter	Short tons	Heat · Btu/lb	Sulfur %	Ash %	Delivered USD/ton
2025-Q3 *	1,563,945	8,408	0.29	5.19	43.94
2025-Q4	1,405,487	8,229	0.40	5.36	45.41
2026-Q1	1,362,943	8,577	0.33	5.14	55.07
2026-Q2	1,359,874	8,807	0.35	5.94	62.09
2026-Q3 *	323,552	8,571	0.24	4.27	48.60

Month / source	Mine	Receiving plant / supplier	Short tons	Delivered USD/ton	Heat · Btu/lb	Sulfur %	Ash %	Purchase	Transport
2026-07EIA row 11526 · preliminary	BUCKSKIN MINE4801200	Muscatine Plant #11167 · IA · BUCKSKIN	58,573	40.37	8,572	0.23	4.30	SpotSUB	Rail
2026-07EIA row 11899 · preliminary	BUCKSKIN MINE4801200	W A Parish3470 · TX · BUCKSKIN	62,032	—Not published	8,610	0.26	4.20	ContractSUB	Rail
2026-07EIA row 11900 · preliminary	BUCKSKIN MINE4801200	W A Parish3470 · TX · BUCKSKIN	138,996	—Not published	8,535	0.23	4.30	ContractSUB	Rail
2026-07EIA row 12202 · preliminary	BUCKSKIN MINE4801200	Scherer6257 · GA · BUCKSKIN MINING CO	15,995	56.16	8,634	0.26	4.30	ContractSUB	Rail
2026-07EIA row 12204 · preliminary	BUCKSKIN MINE4801200	Scherer6257 · GA · BUCKSKIN MINING CO	47,956	56.13	8,601	0.23	4.20	ContractSUB	Rail
2026-06EIA row 9474 · preliminary	BUCKSKIN MINE4801200	Limestone298 · TX · BUCKSKIN	15,509	—Not published	8,495	0.31	4.60	ContractSUB	Rail
2026-06EIA row 9641 · preliminary	BUCKSKIN MINE4801200	Muscatine Plant #11167 · IA · BUCKSKIN	58,590	39.76	8,573	0.27	4.50	SpotSUB	Rail
2026-06EIA row 10005 · preliminary	BUCKSKIN MINE4801200	W A Parish3470 · TX · BUCKSKIN	138,336	—Not published	8,520	0.28	4.60	ContractSUB	Rail
2026-06EIA row 10008 · preliminary	BUCKSKIN MINE4801200	W A Parish3470 · TX · BUCKSKIN	62,031	—Not published	8,660	0.26	4.50	ContractSUB	Rail
2026-06EIA row 10108 · preliminary	COLOWYO MINE0502962	Craig (CO)6021 · CO · COLOWYO MINE	57,742	77.96	9,552	0.38	9.40	ContractSUB	Rail
2026-06EIA row 10294 · preliminary	BUCKSKIN MINE4801200	Scherer6257 · GA · BUCKSKIN MINING CO	15,975	55.93	8,644	0.27	4.20	ContractSUB	Rail
2026-06EIA row 10295 · preliminary	BUCKSKIN MINE4801200	Scherer6257 · GA · BUCKSKIN MINING CO	63,211	54.94	8,540	0.28	4.50	ContractSUB	Rail
2026-05EIA row 7834 · preliminary	BUCKSKIN MINE4801200	Muscatine Plant #11167 · IA · BUCKSKIN	73,085	38.86	8,477	0.30	4.90	SpotSUB	Rail
2026-05EIA row 8164 · preliminary	BUCKSKIN MINE4801200	W A Parish3470 · TX · BUCKSKIN	31,036	—Not published	8,500	0.39	4.90	ContractSUB	Rail
2026-05EIA row 8165 · preliminary	BUCKSKIN MINE4801200	W A Parish3470 · TX · BUCKSKIN	155,095	—Not published	8,510	0.29	4.90	ContractSUB	Rail
2026-05EIA row 8262 · preliminary	COLOWYO MINE0502962	Craig (CO)6021 · CO · COLOWYO MINE	128,368	77.42	9,490	0.41	10.30	ContractSUB	Rail
2026-05EIA row 8428 · preliminary	BUCKSKIN MINE4801200	Scherer6257 · GA · BUCKSKIN MINING CO	15,970	50.66	8,569	0.40	4.90	ContractSUB	Rail
2026-05EIA row 8434 · preliminary	BUCKSKIN MINE4801200	Scherer6257 · GA · BUCKSKIN MINING CO	63,408	53.16	8,493	0.31	4.90	ContractSUB	Rail
2026-04EIA row 5864 · preliminary	BUCKSKIN MINE4801200	Limestone298 · TX · BUCKSKIN	46,719	—Not published	8,485	0.39	5.30	ContractSUB	Rail
2026-04EIA row 6001 · preliminary	BUCKSKIN MINE4801200	Muscatine Plant #11167 · IA · BUCKSKIN	58,619	37.47	8,466	0.80	5.00	SpotSUB	Rail
2026-04EIA row 6347 · preliminary	BUCKSKIN MINE4801200	W A Parish3470 · TX · BUCKSKIN	77,094	—Not published	8,555	0.41	4.90	ContractSUB	Rail
2026-04EIA row 6348 · preliminary	BUCKSKIN MINE4801200	W A Parish3470 · TX · BUCKSKIN	108,554	—Not published	8,475	0.37	5.00	ContractSUB	Rail
2026-04EIA row 6457 · preliminary	COLOWYO MINE0502962	Craig (CO)6021 · CO · COLOWYO MINE	174,551	79.55	9,696	0.34	8.10	ContractSUB	Rail
2026-04EIA row 6642 · preliminary	BUCKSKIN MINE4801200	Scherer6257 · GA · BUCKSKIN MINING CO	15,981	50.57	8,474	0.36	4.70	ContractSUB	Rail
2026-03EIA row 4010 · preliminary	BUCKSKIN MINE4801200	Limestone298 · TX · BUCKSKIN	15,517	—Not published	8,530	0.31	4.80	ContractSUB	Rail

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/TON22.52Weighted by estimated sales of covered mines

ESTIMATED SALES · SHORT TONS8,480,841Allocated from published county sales

ESTIMATED COAL REVENUE · USD191,018,720Covered mines only · not reported revenue

ANNUAL PRODUCTION COVERED100.0%2 of 2 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. 2 current coal members have no matching annual record; their coverage is unknown. 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
Colowyo Mine0502962 · Moffat, Colorado	1,713,919	55.97	1,728,783	96,759,987	County allocation estimate32.95% of eligible county production4 eligible mines / 4 sales respondents
Buckskin Mine4801200 · Campbell, Wyoming	6,752,570	13.96	6,752,058	94,258,733	County allocation estimate3.97% of eligible county production11 eligible mines / 11 sales respondents
Rosebud Coal Sales Company4800084 · Location unavailable	—	—	—	—	No matching annual production record
Big Horn Coal Co4800090 · Location unavailable	—	—	—	—	No matching annual production record

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.

SELECTED PORTFOLIO

4 linked operators.

Relationships reflect the selected mine status and current MSHA controller/operator fields.