| — | WASTELINE, Inc. | CB5275 | Mine contractor | — |
| — | Wastewater Management, L.L.C. | CU992 | Mine contractor | — |
| — | Watco Companies | CS143 | Mine contractor | — |
| — | Watco Mechanical Services | CB5253 | Mine contractor | — |
| — | Water Iatros | CXDP | Mine contractor | — |
| — | Waterloo Coal Company Inc. | CA4621 | Mine contractor | — |
| — | Waterway Materials Recycling LLC | CC6908 | Mine contractor | — |
| — | Watson's Lawn Service | CC7376 | Mine contractor | — |
| — | Waukesha-Pearce Industries | CKU3 | Mine contractor | — |
| — | Wayne County Explosives LLC | CC5004 | Mine contractor | — |
| — | Wayne Kosub, Inc. | CD777 | Mine contractor | — |
| — | Wayne's Portable Welding | CX348 | Mine contractor | — |
| — | Wayne'S Water 'N' Wells | CSVB | Mine contractor | — |
| — | WB Maintenance LLC | CC5199 | Mine contractor | — |
| — | WC ENGLISH INC | CK881 | Mine contractor | — |
| — | WD Heavy Equipment Repair LLC | CC4852 | Mine contractor | — |
| — | WDK Enterprises, Inc. | CE008 | Mine contractor | — |
| — | Wear Concepts Inc | C8DV | Mine contractor | — |
| — | Weaver-Bailey Contractors Inc | CYJC | Mine contractor | — |
| — | Webdrill US Incorporated | CC8652 | Mine contractor | — |
| — | Weber Electric | CB3488 | Mine contractor | — |
| — | Webster Safety Services | CC6746 | Mine contractor | — |
| — | Webster Training & Consulting LLC | CC1996 | Mine contractor | — |
| — | Webster Trucking, Inc. | CG450 | Mine contractor | — |
| — | Weddle Enterprises, Inc. | CY303 | Mine contractor | — |
| — | Weidemann Inc | C2DR | Mine contractor | — |
| — | Weihe Engineers | CC1808 | Mine contractor | — |
| — | Weiler, Inc. | CB8441 | Mine contractor | — |
| — | Weimer Rebuilding Inc. | CX285 | Mine contractor | — |
| — | Weir Minerals | CR102 | Mine contractor | — |
| — | Welco Electrical Contractors | CC5911 | Mine contractor | — |
| — | Weld-Pro Solutions LLC | CC6637 | Mine contractor | — |
| — | Weld-Tech Welding & Machining, Ltd. | CP134 | Mine contractor | — |
| — | Weldcraft Products | CC2025 | Mine contractor | — |
| — | Welders Fit Industrial Services LLC | CC3656 | Mine contractor | — |
| — | Welding Alloys USA Inc. | CQ944 | Mine contractor | — |
| — | Welds All INC | CC7055 | Mine contractor | — |
| — | Wellmore Coal Corp | CRI6 | Mine contractor | — |
| — | Wendling Quarries, Inc. | CK038 | Mine contractor | — |
| — | Werner Construction Inc | CB639 | Mine contractor | — |
| — | Wesco | CNFU | Mine contractor | — |
| — | Wesco Environmental | C4SP | Mine contractor | — |
| — | West applications LLC | CB1603 | Mine contractor | — |
| — | West Coast Contractors | CC0600 | Mine contractor | — |
| — | West Coast Miners, LLC | CC8068 | Mine contractor | — |
| — | West Plains Electric Controls and Automation | CYWI | Mine contractor | — |
| — | West Services | C6JA | Mine contractor | — |
| — | West Side Tractor Sales Company | CA4711 | Mine contractor | — |
| — | West Texas Rock Resources, LLC | CB1120 | Mine contractor | — |
| — | West Wind Reinforcing, LLC | CB2352 | Mine contractor | — |
| — | Westbrook Trucking LLC | CC5815 | Mine contractor | — |
| — | Western Cable,LLC. | CK865 | Mine contractor | — |
| — | Western Drilling Company | CB8316 | Mine contractor | — |
| — | Western Drywall, Inc. | CD0084 | Mine contractor | — |
| — | Western EcoSystems Technology, INC | CC9920 | Mine contractor | — |
| — | Western Industrial | CF325 | Mine contractor | — |
| — | Western Industrial Door Company | CA3323 | Mine contractor | — |
| — | Western Line Builders Inc | CY3L | Mine contractor | — |
| — | Western Metals Recycling Llc | C6LE | Mine contractor | — |
| — | Western Mining Services, Inc. | CUVR | Mine contractor | — |
| — | Western Mountain Supply, Inc. | CA7508 | Mine contractor | — |
| — | Western Refactory Const Inc | CCWN | Mine contractor | — |
| — | Western Slope Safety LLC | CB8193 | Mine contractor | — |
| — | Western States Drilling & Blasting Inc. | CKQZ | Mine contractor | — |
| — | Western States Equipment Company | CAP0 | Mine contractor | — |
| — | Western Steel Builders | CCGI | Mine contractor | — |
| — | Western Timber Company | CB9893 | Mine contractor | — |
| — | Western Water Consultants Inc. | CA8Q | Mine contractor | — |
| — | Western Wrench Services, LLC | CC6340 | Mine contractor | — |
| — | Westland Construction | CB3721 | Mine contractor | — |
| — | WestLand Resources Inc | CS342 | Mine contractor | — |
| — | WestMET Group US LLC | CC7958 | Mine contractor | — |
| — | WESTON SOLUTIONS INC. | C5RA | Mine contractor | — |
| — | Westphal & Company Inc | CLAT | Mine contractor | — |
| — | Wham Steam Cleaning Inc | C7CS | Mine contractor | — |
| — | Wheatley Scale Service Inc | CB762 | Mine contractor | — |
| — | Wheeler Machinery Co | CEQ1 | Mine contractor | — |
| — | Wheeler's Electric Inc. | CT642 | Mine contractor | — |
| — | Wheeling Longwall and Rebuild, Inc. | CB0034 | Mine contractor | — |
| — | Whelan Security | CA3464 | Mine contractor | — |
| — | Whitaker Construction Co, Inc. | CB6611 | Mine contractor | — |
| — | Whitaker Construction Inc | CYPL | Mine contractor | — |
| — | White Electrical Construction Company | CC9591 | Mine contractor | — |
| — | White Industrial Seismology | CNL0 | Mine contractor | — |
| — | White Oak Excavating, LLC | CY928 | Mine contractor | — |
| — | White Pine County dba Tri County Weed Control | CC6965 | Mine contractor | — |
| — | whited truck | CC4140 | Mine contractor | — |
| — | Whiteford & Son, Inc. | CJ257 | Mine contractor | — |
| — | Whitehead Construction Inc | CUBC | Mine contractor | — |
| — | Whitley's Landscaping And Lawn Service | CC7502 | Mine contractor | — |
| — | Whitley's Welding Svc.Inc. | CA3930 | Mine contractor | — |
| — | Whitney & Son, Inc. | CE047 | Mine contractor | — |
| — | Wicked Construction LLC | CC9865 | Mine contractor | — |
| — | Wicki Wholesale Stone Inc | CA068 | Mine contractor | — |
| — | Wieland | CC1922 | Mine contractor | — |
| — | Wiese Planning & Engineering | CAIF | Mine contractor | — |
| — | WiFiber LLC | CC4421 | Mine contractor | — |
| — | Wiginton Welding Inc | CB271 | Mine contractor | — |
| — | Wil-Med LLC | CP281 | Mine contractor | — |
| — | Wilburn FarmsTrucking and Dozer | CB1500 | Mine contractor | — |
| — | Wild Bore Mechanical LLC | CA0625 | Mine contractor | — |
| — | Wild Trucking & Construction | CSVN | Mine contractor | — |
| — | Wildlife Clearing, LLC | CA3155 | Mine contractor | — |
| — | Wiley Sanders Truck Lines Inc | C9NU | Mine contractor | — |
| — | Wilhite Company | CPGK | Mine contractor | — |
| — | Wilkerson Hydrology | CE872 | Mine contractor | — |
| — | Wilkinson mechical | CB4790 | Mine contractor | — |
| — | Wilkinson Welding | CA5881 | Mine contractor | — |
| — | William Dickson Industries | C7IC | Mine contractor | — |
| — | William E Wells Trucking LLC | CB861 | Mine contractor | — |
| — | William Renaud Jr, Inc. | CB3638 | Mine contractor | — |
| — | William S. Fout, Inc. | CS561 | Mine contractor | — |
| — | Williams Brother Coal & Trucking. | CA1564 | Mine contractor | — |
| — | Williams Fabrication and Industrial Services | CB2811 | Mine contractor | — |
| — | Williams Refractory Services Inc. | CKVE | Mine contractor | — |
| — | Williams Trucking. Inc. | CB7462 | Mine contractor | — |
| — | Williams Weld Service | CN346 | Mine contractor | — |
| — | Williamson Rock Hauling | CB3592 | Mine contractor | — |
| — | Williamsport Crane and Rigging, Inc. | CB1625 | Mine contractor | — |
| — | Williamsport Electric Inc. | CD935 | Mine contractor | — |
| — | Willow Creek Electric, LLC | CC7788 | Mine contractor | — |
| — | Wilson Auto Glass, LLC | C9ID | Mine contractor | — |
| — | Wilson Electric, Inc. | CG262 | Mine contractor | — |
| — | Windham Materials, LLC | CC7527 | Mine contractor | — |
| — | Wingfield Scale & Measure | CB5380 | Mine contractor | — |
| — | Wire Brothers, Inc. | CW109 | Mine contractor | — |
| — | Wiregrass Pump and Process, Inc | CB3859 | Mine contractor | — |
| — | Wirtgen America Inc | CY4Q | Mine contractor | — |
| — | Wise Heavy Equipment, LLC | CC2942 | Mine contractor | — |
| — | Wise Services and Recycling, LLC | CC3985 | Mine contractor | — |
| — | Wissehr Electric Inc | CLSH | Mine contractor | — |
| — | Witech Co., Inc. | CB6069 | Mine contractor | — |
| — | Wm E Groves Const Inc | CV18 | Mine contractor | — |
| — | WM Welding & Industrial Maintenance, LLC | CW213 | Mine contractor | — |
| — | WMC INCORPORATED | CE245 | Mine contractor | — |
| — | WNJ Enterprises, Inc. | CC0972 | Mine contractor | — |
| — | Wodtli Quarry | CY318 | Mine contractor | — |
| — | Wojo's Heating & Air Conditioning, Inc. | CB0497 | Mine contractor | — |
| — | Wolf Construction Inc | CC9280 | Mine contractor | — |
| — | Wolfe Mining Products | CC7585 | Mine contractor | — |
| — | Wolfe's Excavating, LLC dba Law Trucking | CB1617 | Mine contractor | — |
| — | Wolfpack Rentals LLC | CB1016 | Mine contractor | — |
| — | Wollam Construction Company, LLC | CV2E | Mine contractor | — |
| — | Wolter Inc. | CA6172 | Mine contractor | — |
| — | Wommack Trucking | CQFD | Mine contractor | — |
| — | Wood. | CYFA | Mine contractor | — |
| — | Woodard & Curran | CA4379 | Mine contractor | — |
| — | Woods Dirt Contractors, Inc. | CQ313 | Mine contractor | — |
| — | Woody Bogler Trucking Co. | CU267 | Mine contractor | — |
| — | Work Um Hard # 4 | CB9590 | Mine contractor | — |
| — | Worldwide Rental services | CY933 | Mine contractor | — |
| — | Worley Inc | CGKD | Mine contractor | — |
| — | Wounded Knee LLC | CB2417 | Mine contractor | — |
| — | Wright Brothers Contracting, inc. | CA6788 | Mine contractor | — |
| — | Wright Concrete & Construction, Inc. | CD244 | Mine contractor | — |
| — | Wright Concrete Underground LLC | CP667 | Mine contractor | — |
| — | Wright Mining Solutions, LLC | CU315 | Mine contractor | — |
| — | Wright One Electric | CU330 | Mine contractor | — |
| — | WRIGHT WELD SERVICE | CB0708 | Mine contractor | — |
| — | Wright Xpress Conveyor Services | CC7495 | Mine contractor | — |
| — | Wrights Custom Alliance Group | CB8792 | Mine contractor | — |
| — | Wrights Electric LLC | CC1090 | Mine contractor | — |
| — | Wrightway Redi Mix LLC | CX187 | Mine contractor | — |
| — | Wrong Crowd Customs LLC | CC4266 | Mine contractor | — |
| — | WSI Southwest, Inc. | CT322 | Mine contractor | — |
| — | WSM Site Services LLC | CC9691 | Mine contractor | — |
| — | WSP USA Inc | C2WV | Mine contractor | — |
| — | WTR Solutions LLC | CC5378 | Mine contractor | — |
| — | WV Construct, LLC | CC1327 | Mine contractor | — |
| — | WV Electric Corporation | CA06 | Mine contractor | — |
| — | WV PLC Repair, Incorporated | CA5208 | Mine contractor | — |
| — | Wyatts Tire Inc. | CZ446 | Mine contractor | — |
| — | Wyoming Crane and Rigging Inc. | CB3531 | Mine contractor | — |
| — | Wyoming Earthmoving Corp | CB2383 | Mine contractor | — |
| — | Wyoming Electric Inc. | CB0143 | Mine contractor | — |
| — | Wyoming Machinery Co | CVM3 | Mine contractor | — |
| — | X Factor Safety, Inc. | CA9042 | Mine contractor | — |
| — | X VAC LLC | CC8893 | Mine contractor | — |
| — | Xpress Service, Sales and Cable Repair | CF305 | Mine contractor | — |
| — | Xtreme Welding | CB1436 | Mine contractor | — |
| — | Xylem Dewatering Solutions, Inc d/b/a Godwin Pumps | C3YE | Mine contractor | — |
| — | Y&B Solutions LLC | CC9730 | Mine contractor | — |
| — | Yancey Bros Co | C3HJ | Mine contractor | — |
| — | Yanke Machine Shop | CUW0 | Mine contractor | — |
| — | Yankee Drilling Co Inc | CGC3 | Mine contractor | — |
| — | Yellow Jacket Drilling Services | CL899 | Mine contractor | — |
| — | Yellowhouse Machinery Co. | CX444 | Mine contractor | — |
| — | Yerbey Concrete LLC | CC2164 | Mine contractor | — |
| — | Yoe Construction | CA0447 | Mine contractor | — |
| — | Young Welding Supply, Inc. | CB9000 | Mine contractor | — |
| — | Young's welding and wrenching LLC | CB8325 | Mine contractor | — |
| — | YTM Cleaning Services LLC | CC4798 | Mine contractor | — |
| — | Yuma County Public Works | CC3041 | Mine contractor | — |
| — | ZachTech LLC | CC7889 | Mine contractor | — |
| — | Zahm Excavating | CB8853 | Mine contractor | — |
| — | Zampell Refractories Inc | CZFF | Mine contractor | — |
| — | Zanetti Bros Inc | CMM5 | Mine contractor | — |
| — | Zanetti Bros., Inc. | CV171 | Mine contractor | — |
| — | Zanoni Trucking | CA4461 | Mine contractor | — |
| — | ZAP Engineering & Construction Services Inc. | CB2280 | Mine contractor | — |
| — | Zap Technical Services | CD803 | Mine contractor | — |
| — | Zartman Construction Inc | CU057 | Mine contractor | — |
| — | Zebra Environmental & Industrial Services, Inc. | CA7876 | Mine contractor | — |
| — | Zeller Technologies | CCAR | Mine contractor | — |
| — | Zemer Arizona Inc | CB8572 | Mine contractor | — |
| — | Zemer California LLC | CC8132 | Mine contractor | — |
| — | Zemer Colorado, LLC | CC8762 | Mine contractor | — |
| — | Zemer International Corp | C3VF | Mine contractor | — |
| — | Zemer Odessa, LLC | CC9224 | Mine contractor | — |
| — | Zenith Tech Inc | CA580 | Mine contractor | — |
| — | Ziegler Inc | CDX1 | Mine contractor | — |
| — | Ziegler Industries | CC1776 | Mine contractor | — |
| — | Zimmerman Industrial | CC0135 | Mine contractor | — |
| — | Zoladz Construction Co Inc | C5QW | Mine contractor | — |
| — | Zona Mechanical LLC | CB9075 | Mine contractor | — |
| — | Zorn Compressor & Equipment Inc. | CA8756 | Mine contractor | — |
| — | Zuniga Stone | CC2190 | Mine contractor | — |