FRS Facility Detail Report


CORDERO ROJO COMPLEX

EPA Registry Id: 110011492900
748 T-7 RD
GILLETTE, WY 82718


The facility locations displayed
come from the FRS Spatial
Coordinates tables. They are the
best representative locations for
the displayed facilities based on
the accuracy of the collection
method and quality assurance
checks performed against each
location. The North American
Datum of 1983 is used to display
all coordinates.

Environmental Interests

Information System System Facility Name Information System Id/Report Link Environmental Interest Type Data Source Last Updated Date Supplemental Environmental Interests:
SAFE DRINKING WATER INFORMATION SYSTEM
NAVAJO TRANS ENRG. CO., LLC (ROJO)-TREATMENT PLANT WY5600796 18541 WATER TREATMENT PLANT SFDW

SAFE DRINKING WATER INFORMATION SYSTEM
NAVAJO TRANS ENRG. CO., LLC (CORDERO) WY5600374 NON-TRANSIENT NON-COMMUNITY WATER SYSTEM SFDW

INTEGRATED COMPLIANCE INFORMATION SYSTEM CORDERO MINING CO - CORDERO MINE 52652 ENFORCEMENT/COMPLIANCE ACTIVITY ICIS 06/24/2002
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (ICIS-NPDES)
CORDERO MINE WYR000072 ICIS-NPDES NON-MAJOR ICIS 12/12/2023 ICIS-
ENFORCEMENT/COMPLIANCE ACTIVITY
AIR QUALITY SYSTEM
17674 AIR MONITORING SITE AQS SITES TRANSACTION

INTEGRATED COMPLIANCE INFORMATION SYSTEM CORDERO MINING COMPANY 21625 FORMAL ENFORCEMENT ACTION ICIS 01/31/1996 ICIS-08-1992-0232
FORMAL ENFORCEMENT ACTION
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (ICIS-NPDES)
CORDERO ROJO MINE WY0023761 ICIS-NPDES NON-MAJOR ICIS

NATIONAL COMPLIANCE DATABASE
CORDERO MINING CO I08#198606111690 1 COMPLIANCE ACTIVITY NCDB

TOXICS RELEASE INVENTORY SYSTEM
CORDERO ROJO MINE 82717CRDRR748T7 TRI REPORTER TRIS 05/19/2016
ICIS-AIR (AIR)
CORDERO ROJO MINE (CORDERO MINING LLC) WY0000005600500008 AIR MINOR ICIS 11/23/2016
SAFE DRINKING WATER INFORMATION SYSTEM
NAVAJO TRANS ENRG. CO., LLC (ROJO) WY5600796 NON-TRANSIENT NON-COMMUNITY WATER SYSTEM SFDW

NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (ICIS-NPDES)
CORDERO MINE WYR000072 STORM WATER INDUSTRIAL ICIS 12/12/2023 ICIS-
ENFORCEMENT/COMPLIANCE ACTIVITY
SAFE DRINKING WATER INFORMATION SYSTEM
NAVAJO TRANS ENRG. CO., LLC (CORDERO)-CHLORINATOR WY5600374 15737 WATER TREATMENT PLANT SFDW

AIR FACILITY SYSTEM
CLOUD PEAK ENERGY CORDERO ROJO MINE 5600500008 AIR MINOR (OPERATING) AIRS/AFS 12/03/2013
NATIONAL COMPLIANCE DATABASE
CORDERO MINING CO C08#86088 COMPLIANCE ACTIVITY NCDB

SAFE DRINKING WATER INFORMATION SYSTEM
NAVAJO TRANS ENRG. CO., LLC (ROJO)-WELL NO 1 WY5600796 101T WATER TREATMENT PLANT SFDW

SAFE DRINKING WATER INFORMATION SYSTEM
NAVAJO TRANS ENRG. CO., LLC (ROJO)-WELL NO 2A WY5600796 102T WATER TREATMENT PLANT SFDW

Additional EPA Reports:  

MyEnvironment  Enforcement and Compliance  Facility Coordinates Viewer  Watershed Report

Standard Industrial Classification Codes (SIC)

Data Source SIC Code Description Primary
AIRS/AFS
1221
BITUMINOUS COAL AND LIGNITE SURFACE MINING

AIR
1221
BITUMINOUS COAL AND LIGNITE SURFACE MINING

NPDES
1221
BITUMINOUS COAL AND LIGNITE SURFACE MINING

NPDES
1241
COAL MINING SERVICES

Facility Codes and Flags

EPA Region: 08
Duns Number: 832086412
Congressional District Number: 01
Legislative District Number:
HUC Code/Watershed: 10120201 / UPPER BELLE FOURCHE
US Mexico Border Indicator:
Federal Facility: NO
Tribal Land: NO

Alternative Names

Alternative Name Source of Data
CABALLO ROJO MINE PCS
CORDERO MINING LLC (ROJO)-TREATMENT PLANT SFDW
CORDERO MINING LLC (CORDERO) SFDW
CORDERO MINING CO ICIS
CABALLO ROJO, INC. NPDES PERMIT
CLOUD PEAK ENERGY CORDERO ROJO MINE AIRS/AFS
CORDERO MINING CO - CORDERO MINE CATS
CORDERO MINING LLC (ROJO)-WELL NO 1 SFDW
CORDERO MINING CO-CORDERO ROJO COMPLEX AIRS/AFS
KENNECOTT ENERGY & COAL COMPANY NOTIFICATION (RCRA)
CORDERO MINING LLC (ROJO)-WELL NO 2A SFDW
CORDERO MINING LLC (CORDERO)-CHLORINATOR SFDW
CORDERO MINING LLC (ROJO) SFDW
CORDERO ROJO MINE FRS
KENNECOTT ENERGY, CORDERO-ROJO COMPLEX RCRAINFO

Organizations

Affiliation Type Name DUNS Number Information System Mailing Address
PARENT COMPANY
CLOUD PEAK ENERGY INC 832086412
TRIS


National Industry Classification System Codes (NAICS)

Data Source NAICS Code Description Primary
AIR 212111 BITUMINOUS COAL AND LIGNITE SURFACE MINING.
AIRS/AFS 212111 BITUMINOUS COAL AND LIGNITE SURFACE MINING.
TRIS 212111 BITUMINOUS COAL AND LIGNITE SURFACE MINING.

Facility Mailing Addresses

Affiliation Type Delivery Point City Name State Postal Code Information System
FACILITY MAILING ADDRESS P.O.BOX 1449 CAMPBELL COUNTY WY 827171449 AIR
FACILITY MAILING ADDRESS P.O.BOX 1449 CAMPBELL COUNTY WY 827171449 AIRS/AFS
MAILING ADDRESS PO BOX 1449 GILLETTE WY 82717 TRIS
ADMINISTRATIVE CONTACT P O BOX 3001 GILLETTE WY 82716 SFDW
ADMINISTRATIVE CONTACT PO BOX 1449 GILLETTE WY 82717 SFDW

Contacts

Affiliation Type Full Name Office Phone Information System Mailing Address
PUBLIC CONTACT
DARRYL MAUNDER
3076876061
TRIS


COMPLIANCE CONTACT
W. E. BEAVER
3076865544
AIR


UNKNOWN CONTACT
W. E. BEAVER
3076865544
AIRS/AFS


UNKNOWN CONTACT
W. E. BEAVER
3076865544
AIR


COMPLIANCE CONTACT
W. E. BEAVER
3076865544
AIRS/AFS


Query executed on: OCT-15-2025


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