| — | Toyota Material Handling Penn West, Inc. | CN962 | Mine contractor | — |
| — | TPS Construction Service | CB0537 | Mine contractor | — |
| — | Trac-Work Inc | CY8Q | Mine contractor | — |
| — | Trackrock Contract Maintenance, LLC | CB8710 | Mine contractor | — |
| — | Tractor & Equipment Company | CM7D | Mine contractor | — |
| — | Tractor & Equipment Company (T&E) | CAS1 | Mine contractor | — |
| — | Trademark Industrial Services LLC | CC8356 | Mine contractor | — |
| — | Trademark Services Company, LLC | CC3677 | Mine contractor | — |
| — | Trader Construction Co | CIQ6 | Mine contractor | — |
| — | TRADEWORX LLC | CC1736 | Mine contractor | — |
| — | Traiangle Grading & Paving Inc | CA284 | Mine contractor | — |
| — | Trail Motors | CIFY | Mine contractor | — |
| — | Tramline, Inc. | CY255 | Mine contractor | — |
| — | Trane | CT596 | Mine contractor | — |
| — | Trans Phos Inc | CMC7 | Mine contractor | — |
| — | Transcale Pty Ltd | CC2298 | Mine contractor | — |
| — | Transco | C4IL | Mine contractor | — |
| — | Transco Northwest Inc | C2CE | Mine contractor | — |
| — | Transwood Inc | CZUZ | Mine contractor | — |
| — | TRC Environmental | CA3571 | Mine contractor | — |
| — | TRC Water Truck | CB2006 | Mine contractor | — |
| — | Treat-Rite Water Services, LLC | CD0338 | Mine contractor | — |
| — | TREN Services, Inc. | CG674 | Mine contractor | — |
| — | Trevathan Brothers Machine & Fabrication, LLC. | CB8226 | Mine contractor | — |
| — | Tri County Contractors, Inc. | CA6799 | Mine contractor | — |
| — | Tri County Materials Inc | CV302 | Mine contractor | — |
| — | Tri County Services Inc | CC6152 | Mine contractor | — |
| — | Tri Star Enterprises | CC4231 | Mine contractor | — |
| — | Tri State Drilling, LLC | CU488 | Mine contractor | — |
| — | Tri State Equipment Cleaners LLC | CR950 | Mine contractor | — |
| — | Tri-City Scaffold Co., Inc. | CC2478 | Mine contractor | — |
| — | Tri-County Co. Inc. | CB7870 | Mine contractor | — |
| — | Tri-County Waste,Inc. | CA2447 | Mine contractor | — |
| — | Tri-Phase Electric | CJEB | Mine contractor | — |
| — | Tri-State Drilling & Blasting, LLC | CC5714 | Mine contractor | — |
| — | Tri-State Electrical Contractors | CB2037 | Mine contractor | — |
| — | Tri-State Fabrication LLC | CC7123 | Mine contractor | — |
| — | Tri-State Ironworks, Inc. | CT091 | Mine contractor | — |
| — | Tri-State Overhead Crane | CC0002 | Mine contractor | — |
| — | Tri-State Sheet Metal | CA8281 | Mine contractor | — |
| — | Triad Control Systems, LLC | CB9220 | Mine contractor | — |
| — | Triad Electric & Controls Inc | CG6G | Mine contractor | — |
| — | Triad Engineering Consultants | CQ52 | Mine contractor | — |
| — | Triangle Communications Inc. | CB6830 | Mine contractor | — |
| — | Triangle Properties | CB5602 | Mine contractor | — |
| — | Triangle Safety Services, Inc. | CWTH | Mine contractor | — |
| — | Tricore Group | CC5878 | Mine contractor | — |
| — | Trihydro Corporation | CK555 | Mine contractor | — |
| — | TrimacTransportation Service, Inc. | CH5P | Mine contractor | — |
| — | TriMedia Environmental & Engineering Services, LLC | CA3753 | Mine contractor | — |
| — | Trinity Construction | CT732 | Mine contractor | — |
| — | Trinova Inc. | CB9485 | Mine contractor | — |
| — | Triple B Blasting, LLC | CQ908 | Mine contractor | — |
| — | Triple C, Inc. | CA8006 | Mine contractor | — |
| — | Triple K Trucking Inc | CWYL | Mine contractor | — |
| — | Triple M Enterprises, Inc | CC3056 | Mine contractor | — |
| — | Triple Point Engineering | CA9870 | Mine contractor | — |
| — | Triple R Trucking, Inc. | CC7661 | Mine contractor | — |
| — | Triple S Tire Co Inc | CKAI | Mine contractor | — |
| — | Triune Electric | CA8390 | Mine contractor | — |
| — | Trotting Fox LLC dba Davidson Brothers | CD139 | Mine contractor | — |
| — | Troy Boiler Works Inc | CCZF | Mine contractor | — |
| — | TRS WELDING & FABRICATION INC. | CJ669 | Mine contractor | — |
| — | TRUCK SERVICE INC. DBA INDIANAPOLIS SPRING | CE080 | Mine contractor | — |
| — | Truckers Lifeline LLC | CC2716 | Mine contractor | — |
| — | Truckin Water Inc. | CK585 | Mine contractor | — |
| — | True Grit NV | CC8758 | Mine contractor | — |
| — | True North Drilling LLC | CC6241 | Mine contractor | — |
| — | True Steel LLC | CA9229 | Mine contractor | — |
| — | Trumbull Corporation | CS852 | Mine contractor | — |
| — | TSB Inc., d/b/a Schultheis Electric | CA1957 | Mine contractor | — |
| — | Tshudy Electrical Services Inc. | CY169 | Mine contractor | — |
| — | TSS Group I LLC | CA8319 | Mine contractor | — |
| — | TufPro Services LLC | CC9323 | Mine contractor | — |
| — | Tullock Construction | CP524 | Mine contractor | — |
| — | Turnell Corp. | CU123 | Mine contractor | — |
| — | Turner Contracting, Inc | CK762 | Mine contractor | — |
| — | Turner Heavy Haul | CB9846 | Mine contractor | — |
| — | Turner Industries Group LLC | CHPQ | Mine contractor | — |
| — | Turner Mining Group | CB5457 | Mine contractor | — |
| — | Turner Scale, Inc | CR472 | Mine contractor | — |
| — | Turner Trans Lift, Inc. | CE1P | Mine contractor | — |
| — | Turner Welding and Fabrication LLC | CC3012 | Mine contractor | — |
| — | Turnkey Processing Solutions | CR722 | Mine contractor | — |
| — | Tuscaloosa Scale Company, Inc. | CG485 | Mine contractor | — |
| — | TW Hall Logging Co. LLC | CC7659 | Mine contractor | — |
| — | Tweet-Garot Mechanical Inc | CC1637 | Mine contractor | — |
| — | Twehous Excavating Company Inc | CP0F | Mine contractor | — |
| — | TWI, LLC | CA5626 | Mine contractor | — |
| — | Twiford Electric | CW647 | Mine contractor | — |
| — | Twin D | CC9540 | Mine contractor | — |
| — | Twin Electric, Inc | CC3788 | Mine contractor | — |
| — | Twin Enterprise Inc | CA1727 | Mine contractor | — |
| — | TWIN HILLES | CC3674 | Mine contractor | — |
| — | Twinkle Co. | CA7707 | Mine contractor | — |
| — | Two Eight Drilling DBA Venture Drilling East, LLC. | CA9499 | Mine contractor | — |
| — | Two Eight Drilling Incorporated | CKM9 | Mine contractor | — |
| — | Two State Construction Inc | CNHB | Mine contractor | — |
| — | Two Way Radio Service Co | CZWX | Mine contractor | — |
| — | Tyco Machine Inc. | CM199 | Mine contractor | — |
| — | Tyler Equipment Co | CHY9 | Mine contractor | — |
| — | Tyler Rentals | CB5696 | Mine contractor | — |
| — | Tyndell Electri, LLC | CC9505 | Mine contractor | — |
| — | U S Security Associates Inc | CA054 | Mine contractor | — |
| — | U. S. Mining, Inc. | CC0190 | Mine contractor | — |
| — | U.S. Bagging, LLC | CA9880 | Mine contractor | — |
| — | U.S. Transport Inc | CZIZ | Mine contractor | — |
| — | U.S.A. Silo Service, Inc. | C7KI | Mine contractor | — |
| — | UCI Construction, Inc. | CFGE | Mine contractor | — |
| — | UDC Corporation | CC832 | Mine contractor | — |
| — | Ulland Bros Inc | CCV0 | Mine contractor | — |
| — | Ullman Oil Company | CA8412 | Mine contractor | — |
| — | Ultimate Welding & Fabrication LLC | CU031 | Mine contractor | — |
| — | Ultra Turf Landscape | CC6380 | Mine contractor | — |
| — | Ultron Inc | CDXG | Mine contractor | — |
| — | Umbel's Mechanical llc | CB1808 | Mine contractor | — |
| — | Umpqua Testing Service | CB8351 | Mine contractor | — |
| — | Underground Response, LLC | CJ399 | Mine contractor | — |
| — | Underground Vault & Storage In | CVJ2 | Mine contractor | — |
| — | Unger's Excavating LLC | CB3624 | Mine contractor | — |
| — | Unibridge Systems, Inc. | CH209 | Mine contractor | — |
| — | UniFide CST | CC9814 | Mine contractor | — |
| — | Unified Defense Holdings, DBA Prince Service & Mfg | CC6434 | Mine contractor | — |
| — | Unilliance Inc | CB502 | Mine contractor | — |
| — | Unio Digital | CC7868 | Mine contractor | — |
| — | Union Tank Car Company | CB1597 | Mine contractor | — |
| — | Unique Solutions for Industry L.L.C. | CU780 | Mine contractor | — |
| — | United Central Industrial Supplies | CCIQ | Mine contractor | — |
| — | United Construction & Forestry | CC2731 | Mine contractor | — |
| — | United Construction Co Inc | CY3S | Mine contractor | — |
| — | United Electrical Contractors, LLC | CC7972 | Mine contractor | — |
| — | United Fire Equipment Co | CMQL | Mine contractor | — |
| — | United Glass Services | CC5855 | Mine contractor | — |
| — | United Industrials | CC1646 | Mine contractor | — |
| — | UNITED INFRASTRUCTURE GROUP INC | CC7350 | Mine contractor | — |
| — | United Metals LLC | CF376 | Mine contractor | — |
| — | United Refractories Co Inc | CCFA | Mine contractor | — |
| — | United Rentals (North America), Inc. | CD113 | Mine contractor | — |
| — | United Team Mechanical | CB2098 | Mine contractor | — |
| — | United Workforce | CC6971 | Mine contractor | — |
| — | Universal Civil Construction | CC1997 | Mine contractor | — |
| — | University of Georgia - Coastal Ecology Lab | CC4636 | Mine contractor | — |
| — | Upright Industrial Group LLC | CB1649 | Mine contractor | — |
| — | Urban Electric Company | CC3946 | Mine contractor | — |
| — | Urrutias Welding | CS600 | Mine contractor | — |
| — | US Crane Inc | CB3067 | Mine contractor | — |
| — | US Trackworks, LLC | CB8164 | Mine contractor | — |
| — | USA Scales Inc DBA Quality Scales Unlimited | CP955 | Mine contractor | — |
| — | USADebusk | CB8509 | Mine contractor | — |
| — | USC Technologies | CB5771 | Mine contractor | — |
| — | USinsulation inc. | CC5656 | Mine contractor | — |
| — | Utah Landscaping Rock | CC6179 | Mine contractor | — |
| — | Utilicon Services Inc | C3BS | Mine contractor | — |
| — | Utility Safety & Design, Inc. | CB3922 | Mine contractor | — |
| — | V Garman LLC | CB4418 | Mine contractor | — |
| — | VA Crane Rental, Inc. | CS665 | Mine contractor | — |
| — | Vacuum, Pump & Compressor Inc | CC8031 | Mine contractor | — |
| — | Vallen Distribution, Inc. | CA2184 | Mine contractor | — |
| — | Valley alpha Electric, Inc. | CP243 | Mine contractor | — |
| — | Valley Automation, Inc. | CB6893 | Mine contractor | — |
| — | Valley Electric Company Inc | CI4D | Mine contractor | — |
| — | Valley Imaging Solutions | CA5464 | Mine contractor | — |
| — | Valley Industrial Rubber Products Co., Inc. | CT801 | Mine contractor | — |
| — | Valley Mechanical, Inc | CC2966 | Mine contractor | — |
| — | Valley Railroad Company, LLC | CA3831 | Mine contractor | — |
| — | Valley Rock Solutions LLC | CB7578 | Mine contractor | — |
| — | Valley Scale Company, LLC dba VSC, LLC | CZ403 | Mine contractor | — |
| — | VALLEY SPLICING CO | CG990 | Mine contractor | — |
| — | Valley Tire Co Inc | CZXT | Mine contractor | — |
| — | Valley Welding | CYVV | Mine contractor | — |
| — | Valor Oil LLC | CZZN | Mine contractor | — |
| — | Van Ert Electric Co. | CP182 | Mine contractor | — |
| — | Van Wert Fire Equipment | CB2311 | Mine contractor | — |
| — | Vandemark Ventures | CC4462 | Mine contractor | — |
| — | Vanhouse Services LLC | CGQX | Mine contractor | — |
| — | Vann Enterprises, LLC | CC5895 | Mine contractor | — |
| — | Varney, Inc. | CA1220 | Mine contractor | — |
| — | Vaughn Electric Co Inc | CA381 | Mine contractor | — |
| — | Vaughn Smith Const Inc | CAX9 | Mine contractor | — |
| — | Vaughn welding llc | CC2311 | Mine contractor | — |
| — | Vaughn's Plumbing and Heating Co. | CF535 | Mine contractor | — |
| — | VCS Security Systems Inc | CQ581 | Mine contractor | — |
| — | Vector Construction Inc. | CW148 | Mine contractor | — |
| — | Vector Construction Inc. | CC8777 | Mine contractor | — |
| — | VECTOR FLEET MANAGEMENT | CYGD | Mine contractor | — |
| — | Veit & Company, Inc. | CA956 | Mine contractor | — |
| — | Velocity Flow Technologies | CB8150 | Mine contractor | — |
| — | Venter Industrial LLC | CC3992 | Mine contractor | — |
| — | Ventilation Power Cleaning, Inc. | CV354 | Mine contractor | — |
| — | Veolia ES Technical Solutions, L.L.C. | CG697 | Mine contractor | — |
| — | VEOLIA Water Technologies and Solutions | CB6426 | Mine contractor | — |
| — | Verdad Group, LLC | CL088 | Mine contractor | — |
| — | Veritas Contracting LLC | CB7102 | Mine contractor | — |
| — | Vermilion Shell & Limestone Company, Inc. | CR889 | Mine contractor | — |
| — | Versatile Construction, LLC | CC8012 | Mine contractor | — |
| — | Versatile Fabrication | C1EN | Mine contractor | — |
| — | Vertical Earth Incorporated | CB8865 | Mine contractor | — |
| — | Vertical Mobility of Toledo LLC | CB1482 | Mine contractor | — |
| — | Vesta Mine Services, Inc. | CB8129 | Mine contractor | — |
| — | Vezer Industrial Professionals Inc. | C5WR | Mine contractor | — |
| — | VIA Technologies, Inc. | CC8332 | Mine contractor | — |
| — | Viacore Solutions, LLC | CB1538 | Mine contractor | — |
| — | Vibanalysis Services, Inc. | CD350 | Mine contractor | — |
| — | Vibra-Tech Engeneers Inc | CAX8 | Mine contractor | — |
| — | Vic's Crane & Heavy Haul Inc. | CB3928 | Mine contractor | — |
| — | Vick Maintaince, Inc. | CTQN | Mine contractor | — |
| — | Vidimos, Inc. | CJ768 | Mine contractor | — |
| — | ViewMore LLC | CC5550 | Mine contractor | — |
| — | Vigil Industrial Protection LLC | CB6204 | Mine contractor | — |
| — | Villager Construction Inc. | CX556 | Mine contractor | — |
| — | Vincennes Industrial Supply | CKRT | Mine contractor | — |
| — | Vinton Construction Company | CS335 | Mine contractor | — |
| — | Virgil's Electric | CB4713 | Mine contractor | — |
| — | Virginia Carolina Paving | CN091 | Mine contractor | — |
| — | Virginia Construction Inc. | CK709 | Mine contractor | — |
| — | Virginia Drilling Company, LLC | CF279 | Mine contractor | — |
| — | Vishnefski Electrical, Inc. | CC7943 | Mine contractor | — |
| — | Visible Difference Janitorial | CC8790 | Mine contractor | — |
| — | vision Refractory LLC | CC6520 | Mine contractor | — |
| — | Visser Repair Service | CC6810 | Mine contractor | — |
| — | Vissering Construction Company | CA090 | Mine contractor | — |
| — | Vista Construction and Development, LLC | CB8348 | Mine contractor | — |
| — | Vista Recycling Inc | C8SA | Mine contractor | — |
| — | Visual Inspection Systems, LLC | CB3069 | Mine contractor | — |
| — | Vital Welding & Solutions LLC | CC4258 | Mine contractor | — |
| — | Volkmann Railroad Builders | CMCD | Mine contractor | — |
| — | VoltaGrid, LLC | CC2239 | Mine contractor | — |
| — | Volvo Construction Equipment | CB1923 | Mine contractor | — |
| — | Vortek LLC | CC1771 | Mine contractor | — |
| — | Vortex Industries Inc | C9LQ | Mine contractor | — |
| — | Voss Equipment, Inc. | CA0584 | Mine contractor | — |
| — | Votruba Enterprises, Inc. | CA8955 | Mine contractor | — |
| — | Vroom Engr & Manuf Inc | CHQN | Mine contractor | — |
| — | VSC Fire & Security | CT305 | Mine contractor | — |
| — | VSS International Inc. | CB4190 | Mine contractor | — |
| — | VTF Excavation LLC | CA9584 | Mine contractor | — |
| — | Vulcan Central Services | CUVW | Mine contractor | — |
| — | Vulcan Construction Materials LLC TN Stripping | CB9083 | Mine contractor | — |
| — | Vulcan Construction Materials, LP-Support Services | CG526 | Mine contractor | — |
| — | Vulcan Drill Services | CK5K | Mine contractor | — |
| — | Vulcan IT Services | CY430 | Mine contractor | — |
| — | Vulcan Materials Co | CN456 | Mine contractor | — |
| — | W & W Welding | CG349 | Mine contractor | — |
| — | W F Jackson Constr Inc | CZ46 | Mine contractor | — |
| — | W F MORGAN CO LLC | CC8505 | Mine contractor | — |
| — | W K Construction Co., Inc. | CC9126 | Mine contractor | — |
| — | W M Construction LLC | CC0866 | Mine contractor | — |
| — | W V Glass Co | CB999 | Mine contractor | — |
| — | W W Clyde & Co | CR08 | Mine contractor | — |
| — | W. A. Murphy LLC | CDNF | Mine contractor | — |
| — | W. G. Yates & Son's Construction Co | CG556 | Mine contractor | — |
| — | W. L. Gore & Associates | CB3595 | Mine contractor | — |
| — | W. O. Grubb Steel Erection, Inc. | CS669 | Mine contractor | — |
| — | W. W. Williams | CSBK | Mine contractor | — |
| — | W.G. Dale Electric Co. | CQ152 | Mine contractor | — |
| — | W.G. Dudley Electrical Contractors, Inc. | C3HA | Mine contractor | — |
| — | W.O.Whitaker& Son Inc | CA2804 | Mine contractor | — |
| — | W.R. Martin Company | CA3210 | Mine contractor | — |
| — | W.W. Wheeler & Associates, Inc. | CL570 | Mine contractor | — |
| — | W.W. Williams Co. | CL838 | Mine contractor | — |
| — | W.WGC, LLC | CVVS | Mine contractor | — |
| — | W3 Heavy Equipment and Repair LLC | CC5710 | Mine contractor | — |
| — | Wachter, Inc. | CD519 | Mine contractor | — |
| — | Wade's Hauling and Excavation | CC9288 | Mine contractor | — |
| — | Waggoner Fabrication | CV059 | Mine contractor | — |
| — | Wagner Equipment Co (Caterpiller) | CQ3S | Mine contractor | — |
| — | Wagstaff Crane and Rigging | CC1834 | Mine contractor | — |
| — | WAIL Construction Company LLC | CD0016 | Mine contractor | — |
| — | Wales Industrial Service Inc | CQA0 | Mine contractor | — |
| — | Walkers Truck Contractors | CW2L | Mine contractor | — |
| — | Wallace Electrical Systems LLC. | CL390 | Mine contractor | — |
| — | Waller Welding | CC5862 | Mine contractor | — |
| — | Wallis Lubricants | CU682 | Mine contractor | — |
| — | Wallis Oil Company, Inc | CA6149 | Mine contractor | — |
| — | Walsh Reclamation Inc | C6SV | Mine contractor | — |
| — | Walsh Services LLC | CB2721 | Mine contractor | — |
| — | Walter S Pratt and Sons Inc | CA5266 | Mine contractor | — |
| — | Walton and Company Inc. | CQ791 | Mine contractor | — |
| — | Wampum Hardware Co | CBH8 | Mine contractor | — |
| — | Wampum Hardware DBA Armstrong Explosives | CTYR | Mine contractor | — |
| — | Wampum Hardware DBA Northern Ohio Explosives | CTVH | Mine contractor | — |
| — | Wantage Excavating Company Inc. | CB3956 | Mine contractor | — |
| — | Ware Drilling Inc | CZSA | Mine contractor | — |
| — | Warex Corp | CQPK | Mine contractor | — |
| — | Warex Transportation LLC | CB0761 | Mine contractor | — |
| — | Warfab, LLC | CUKL | Mine contractor | — |
| — | Warihay Enterprises Inc. | CB2023 | Mine contractor | — |
| — | Warner Welding, LLC | CC0437 | Mine contractor | — |
| — | Warr Grading, Inc. | CR675 | Mine contractor | — |
| — | Warren Power & Machinery, Inc. | CE432 | Mine contractor | — |
| — | Warren Transport | CC203 | Mine contractor | — |
| — | WARRENS WATER TRUCK SERVICE | CV530 | Mine contractor | — |
| — | Warrior enviromental and mining services | CC0237 | Mine contractor | — |
| — | Warrior Tractor and Equipment Company, Inc. | CD889 | Mine contractor | — |
| — | Washington County Machine Shop | CENP | Mine contractor | — |
| — | Washington Equipment Manufacturing Company, Inc. | CC5525 | Mine contractor | — |
| — | Wasser Technologies, Inc. | CA7551 | Mine contractor | — |
| — | Waste Management | CTGT | Mine contractor | — |
| — | Waste Management - Quarry LF | CC2441 | Mine contractor | — |
| — | Waste-Pro USA | CB8172 | Mine contractor | — |