| — | Seawright & Robison Construction, Inc. | CC1513 | Mine contractor | — |
| — | Sebold Trucking Inc | CSEQ | Mine contractor | — |
| — | SEBREN DRILLING & BLASTING | CN967 | Mine contractor | — |
| — | Securitas Security Services USA Inc. | CP9L | Mine contractor | — |
| — | Seedway, LLC | CR711 | Mine contractor | — |
| — | Seetech, LLC | CY540 | Mine contractor | — |
| — | SEI | CGPV | Mine contractor | — |
| — | Seifert Enterprises LLC | CU751 | Mine contractor | — |
| — | Seither & Cherry Company | CIEZ | Mine contractor | — |
| — | Seither & Cherry Quad Cities I | CZUQ | Mine contractor | — |
| — | Select Water Solutions, LLC | CC5266 | Mine contractor | — |
| — | Selinsky Force | CA6433 | Mine contractor | — |
| — | Sellers Construction Co. LLC | CD841 | Mine contractor | — |
| — | Selsam Enterprises LLC | CD621 | Mine contractor | — |
| — | Senex Explosives | CNTR | Mine contractor | — |
| — | Sequoia Services LLC | CC2482 | Mine contractor | — |
| — | Serodino Inc | C4SZ | Mine contractor | — |
| — | Service One | CL917 | Mine contractor | — |
| — | Service Pump & Supply Coinc | CW1Y | Mine contractor | — |
| — | Service Tire Truck Center | CV994 | Mine contractor | — |
| — | SESCO Group | CB3654 | Mine contractor | — |
| — | SET Environmental, Inc. | CA4666 | Mine contractor | — |
| — | Settle Muter Electric | CC8387 | Mine contractor | — |
| — | Seufert Construction & Supply Company, Inc. | CM849 | Mine contractor | — |
| — | SFI LLC | CIBR | Mine contractor | — |
| — | SGC Core Drilling | CM480 | Mine contractor | — |
| — | SGC Stripping Crew - Vulcan Construction Materials | CC4030 | Mine contractor | — |
| — | SGS North America Inc., Minerals Services Division | CK02 | Mine contractor | — |
| — | Shades of Green Landscaping LLC | CB9825 | Mine contractor | — |
| — | Shafer Enterprises | CB374 | Mine contractor | — |
| — | Shallenberger Construction, Inc. | CR691 | Mine contractor | — |
| — | Shambaugh and Son LP | CC0813 | Mine contractor | — |
| — | Shamblin Stone Inc | CENQ | Mine contractor | — |
| — | Shamrock Cartage Inc. | CC3161 | Mine contractor | — |
| — | Shamrock Environmental Corp | CA476 | Mine contractor | — |
| — | Shannon & Wilson Inc | CQS8 | Mine contractor | — |
| — | Shared Systems Technology Inc | CA489 | Mine contractor | — |
| — | Sharp & Fellows Inc | C8WN | Mine contractor | — |
| — | Shaw Brothers Construction Inc. | CA3592 | Mine contractor | — |
| — | Shaw Heavy Equipment Repair, Inc. | CW891 | Mine contractor | — |
| — | She Hauls It Too, LLC | CC8722 | Mine contractor | — |
| — | Sheaco Incorporated | CA7866 | Mine contractor | — |
| — | Sheila Spaulding | CA7357 | Mine contractor | — |
| — | Shelbeck Excavating LLC | CA1716 | Mine contractor | — |
| — | Shell & Whitmore Reliability Solutions LLC | CC2574 | Mine contractor | — |
| — | Shellstoneinc. | CC3752 | Mine contractor | — |
| — | Shelly & Sands, Inc. | CR029 | Mine contractor | — |
| — | Shelly Co | CC7H | Mine contractor | — |
| — | Shelton Trucking | CQ289 | Mine contractor | — |
| — | Shenandoah Indust Rubber Co In | CRC8 | Mine contractor | — |
| — | Shenandoah Valley Electric Company | CA2587 | Mine contractor | — |
| — | Shepherd Iron Works | CA8120 | Mine contractor | — |
| — | Shermco Industries Inc | CG7X | Mine contractor | — |
| — | SHILOH MINING INC | CC1589 | Mine contractor | — |
| — | Shimmick | CD50 | Mine contractor | — |
| — | Ship-Right Resources, LLC | CC7356 | Mine contractor | — |
| — | Shipman Maintenance LLC | CQ119 | Mine contractor | — |
| — | Shipp Belting Co., LLC | CC7401 | Mine contractor | — |
| — | shippy brother construction | CT600 | Mine contractor | — |
| — | Shirley Ann Trucking--M&M Enterprise Transportatio | CUAC | Mine contractor | — |
| — | Shirley Fabrication LLC | CC5003 | Mine contractor | — |
| — | Shive-Hattery Group, Inc | CA5707 | Mine contractor | — |
| — | Shively Electric Company | CB0110 | Mine contractor | — |
| — | Shook Construction | CC7965 | Mine contractor | — |
| — | Shoreline Contractors LLC | CC3401 | Mine contractor | — |
| — | Shoreline Metal Fabricators, Inc. | CA9671 | Mine contractor | — |
| — | Short Horn Service Company, LLC | CC6249 | Mine contractor | — |
| — | Short Powerline Service | CC245 | Mine contractor | — |
| — | Shouse Repair & Service LLC | CC6197 | Mine contractor | — |
| — | Si's Blasting LLC | CC7828 | Mine contractor | — |
| — | Sides Contracting Co. Inc. | CB2944 | Mine contractor | — |
| — | Sidney Electric Company | CRT8 | Mine contractor | — |
| — | Sidwell Materials Inc | CSVT | Mine contractor | — |
| — | Siege Industrial | CC9211 | Mine contractor | — |
| — | Siemens Industry, Inc. | CB8003 | Mine contractor | — |
| — | Sika Corporation | C6GU | Mine contractor | — |
| — | Silver Spur Conveyors Inc | C3QU | Mine contractor | — |
| — | Silver State Exploration,LLC | CC6240 | Mine contractor | — |
| — | SILVER STATE WIRE ROPE & RIGGING INC. | CC701 | Mine contractor | — |
| — | Silver Valley Doors LLC. | CA3390 | Mine contractor | — |
| — | Simmco | CNKY | Mine contractor | — |
| — | Simmons Covering Service | CB564 | Mine contractor | — |
| — | Simmons Equipment Company | CB3904 | Mine contractor | — |
| — | SimplexGrinnell LP | CE331 | Mine contractor | — |
| — | Sims 360 Health and Safety Solutions | CC2943 | Mine contractor | — |
| — | SISSON SCALES | CX821 | Mine contractor | — |
| — | Site Reach LLC | CC2791 | Mine contractor | — |
| — | Site Services | CB9739 | Mine contractor | — |
| — | Sitescan DBA Hydrogeophysics, Inc. | CW146 | Mine contractor | — |
| — | SiteWORX LLC | CA8905 | Mine contractor | — |
| — | Six Point Welding and Fabrication | CC2228 | Mine contractor | — |
| — | Sixense, Inc. | CC8694 | Mine contractor | — |
| — | SJW Commercial Concrete, LLC | CA7120 | Mine contractor | — |
| — | SK Benway Construction | CB8720 | Mine contractor | — |
| — | Skelton's Fire Equipment, Inc. | CA7628 | Mine contractor | — |
| — | SKF USA, Inc. | CG746 | Mine contractor | — |
| — | Sky Electrical Contractors,LLC | CB2218 | Mine contractor | — |
| — | Skyler King Mechanical Service | CC0472 | Mine contractor | — |
| — | Skyline Contracting Inc | CA3156 | Mine contractor | — |
| — | SkyLine Dredging & Excavating Inc | CQ031 | Mine contractor | — |
| — | Skyline Electric Company | CV5X | Mine contractor | — |
| — | SkyView Testing Inc. | CA8112 | Mine contractor | — |
| — | Slade Landscaping inc. | CA0878 | Mine contractor | — |
| — | Slater Seeding Inc | CH782 | Mine contractor | — |
| — | Slattery Enterprises, Inc., dba Paintbrush Service | CQ308 | Mine contractor | — |
| — | Sloth Electric, Inc. | CX140 | Mine contractor | — |
| — | SLS West Inc | C6UY | Mine contractor | — |
| — | SM Tire | CB6533 | Mine contractor | — |
| — | SMAF Construction | CF972 | Mine contractor | — |
| — | Small Mine Development | CA3V | Mine contractor | — |
| — | SMALL TOWN GLASS | CC6189 | Mine contractor | — |
| — | Smith & Brown Contractors Inc | CA074 | Mine contractor | — |
| — | Smith & Jennings Inc | CUHB | Mine contractor | — |
| — | Smith & Sons Construction LLC | CYK9 | Mine contractor | — |
| — | Smith Brothers Industrial | CC8587 | Mine contractor | — |
| — | Smith Elect Contrac Inc | CZ92 | Mine contractor | — |
| — | Smith Energy, LLC | CC8300 | Mine contractor | — |
| — | Smith Excavating and Construction, Inc. | CB9331 | Mine contractor | — |
| — | Smith Hauling Inc | CBH7 | Mine contractor | — |
| — | Smith Industrial Services, Inc. | CJ239 | Mine contractor | — |
| — | Smith Oil Corporation | CA2063 | Mine contractor | — |
| — | Smith Power Products Inc | CP7R | Mine contractor | — |
| — | Smith Services Inc | CCPK | Mine contractor | — |
| — | Smith-Gray Electric Co | C5TF | Mine contractor | — |
| — | Smith-Rowe,LLC | CA3727 | Mine contractor | — |
| — | SmitHahn Company | CNFD | Mine contractor | — |
| — | Smithco Enterprises Inc | CQJW | Mine contractor | — |
| — | SMP Welding, LLC | CA0498 | Mine contractor | — |
| — | SMS Construction, LLC | CC1473 | Mine contractor | — |
| — | Smyth Industries Inc | CA6261 | Mine contractor | — |
| — | Sneath Fire Safety Equipment, Inc. | CA4930 | Mine contractor | — |
| — | SNF Mining, Inc. | CX948 | Mine contractor | — |
| — | snider tire inc. | CT898 | Mine contractor | — |
| — | Snowco General Contractor | CL267 | Mine contractor | — |
| — | Snyder and Staley Engineering P.L.C. | CA7631 | Mine contractor | — |
| — | Snyder Mechanical | CP5L | Mine contractor | — |
| — | Soder Mechanical Inc | C6RN | Mine contractor | — |
| — | Soil Pros Corp | CC2051 | Mine contractor | — |
| — | Solenis LLC | C3KW | Mine contractor | — |
| — | Soles Electric Company | CDXX | Mine contractor | — |
| — | soles industrial electric,inc. | CT772 | Mine contractor | — |
| — | Solid Ground Industrial LLC | CC4962 | Mine contractor | — |
| — | Solid Platforms. Inc. | CP330 | Mine contractor | — |
| — | SOLITO INC | CA8669 | Mine contractor | — |
| — | Solitude Field Service LLC | CC6615 | Mine contractor | — |
| — | Sollers Construction LLC | CA0663 | Mine contractor | — |
| — | Solution Service Inc | CA8671 | Mine contractor | — |
| — | Somerset International, Inc. | CA8819 | Mine contractor | — |
| — | Somerset Well Drilling Co | CER1 | Mine contractor | — |
| — | South Arrow Equipment Repair | CB3892 | Mine contractor | — |
| — | South Creek Construction Inc. | CC1061 | Mine contractor | — |
| — | South East Welding LLC | C5UE | Mine contractor | — |
| — | South Industries, Inc. | CA3981 | Mine contractor | — |
| — | South Louisiana Fill Materials, LLC | CZ344 | Mine contractor | — |
| — | South Paw Electric, Inc. | CB6364 | Mine contractor | — |
| — | Southeast Crane & Hoist, LLC | CB9221 | Mine contractor | — |
| — | Southeast Environmental Management | CU863 | Mine contractor | — |
| — | Southeast Fire and Safety Systems Inc | CZ490 | Mine contractor | — |
| — | Southeast Industrial Services | CC2227 | Mine contractor | — |
| — | Southeast Maintenance and Mechanical LLC | CU667 | Mine contractor | — |
| — | Southeast Outdoor Solutions, LLC | CB6905 | Mine contractor | — |
| — | Southeast Road Builders Inc. | CE220 | Mine contractor | — |
| — | Southeastern Conveyor Services, Inc. | CB3779 | Mine contractor | — |
| — | Southeastern Electric Inc | CC9396 | Mine contractor | — |
| — | Southeastern Equipment Company Inc | CJRP | Mine contractor | — |
| — | Southeastern Performance Minerals, LLC | CXLH | Mine contractor | — |
| — | SOUTHERN AIR INC. | CK755 | Mine contractor | — |
| — | Southern Chem Industries Inc. | CU861 | Mine contractor | — |
| — | Southern Construction Company LLC | CC3006 | Mine contractor | — |
| — | Southern Design & Automation, Inc. | CA520 | Mine contractor | — |
| — | Southern Drill and Machine Services,LLC | CC7172 | Mine contractor | — |
| — | Southern Elevator Company Inc. | CB5350 | Mine contractor | — |
| — | Southern Environmental, Inc. | CE797 | Mine contractor | — |
| — | Southern Machinery Co LLC | C6PV | Mine contractor | — |
| — | Southern Pride Drilling | CB8290 | Mine contractor | — |
| — | Southern Red Rock Services, LLC | CB4823 | Mine contractor | — |
| — | Southern Refractories Inc | CR5U | Mine contractor | — |
| — | Southern Tire Mart | CDR1 | Mine contractor | — |
| — | Southern Welding, LLC. | CQ464 | Mine contractor | — |
| — | Southern Wisconsin Co-op | CA6111 | Mine contractor | — |
| — | Southhand Electric Inc | CC597 | Mine contractor | — |
| — | Southway Crane & Rigging - Columbia, LLC | CR560 | Mine contractor | — |
| — | Southway Crane & Rigging, LLC | CT329 | Mine contractor | — |
| — | Southwest & Associates Inc | CYAE | Mine contractor | — |
| — | Southwest Energy LLC | CTD0 | Mine contractor | — |
| — | Southwest Hazard Control Inc | CSGU | Mine contractor | — |
| — | Southwest Industrial Rigging | CT054 | Mine contractor | — |
| — | Southwest Irrigaiton LLC | CA5408 | Mine contractor | — |
| — | Southwest Power Generation Services LLC | CC9343 | Mine contractor | — |
| — | Southwestern Scales | CS893 | Mine contractor | — |
| — | Southwestern Sealcoating Inc | CHPG | Mine contractor | — |
| — | Southworth-Milton Inc | CKPH | Mine contractor | — |
| — | Sovereign Mining CO | CC6514 | Mine contractor | — |
| — | Spafford Trucking | CC2126 | Mine contractor | — |
| — | Spain painting | CC3000 | Mine contractor | — |
| — | Sparks Commercial Tire | CK774 | Mine contractor | — |
| — | Sparks Contractors Inc | CHIR | Mine contractor | — |
| — | SPE, Inc. | CC3890 | Mine contractor | — |
| — | Special Mine Services Inc | CW7F | Mine contractor | — |
| — | Special Power Inc | CKFZ | Mine contractor | — |
| — | Specialized Blasting Services | C6DS | Mine contractor | — |
| — | Specialized Construction Services | CC0497 | Mine contractor | — |
| — | Specialized Electrical Services | CC0098 | Mine contractor | — |
| — | Specialty Rescue and Fire Service, LLC | CC5813 | Mine contractor | — |
| — | Spectrum Welding | CYVS | Mine contractor | — |
| — | Spheros Environmental | CC9897 | Mine contractor | — |
| — | Spock Enterprise LLC | CB4289 | Mine contractor | — |
| — | Sponseller Group, Inc. | CP399 | Mine contractor | — |
| — | Spray Systems Of Az Inc | CPEQ | Mine contractor | — |
| — | Spriggs Construction Company LLC | CZ124 | Mine contractor | — |
| — | Spring Butte Rock, INC. | CC2324 | Mine contractor | — |
| — | Squeeze Security Group, Inc. | CE359 | Mine contractor | — |
| — | SR&R Environmental, Inc. | CC7855 | Mine contractor | — |
| — | SREC Resources, Inc. | CZ520 | Mine contractor | — |
| — | SRM Jones & Stone Drilling, LLC | CC2837 | Mine contractor | — |
| — | SS Welding and Mechanical | CC4015 | Mine contractor | — |
| — | SSI Consulting, LLC | CA8662 | Mine contractor | — |
| — | St. Peter Metal Works | CB2522 | Mine contractor | — |
| — | Stabilis Energy LLC | CA5791 | Mine contractor | — |
| — | Stack Bros Mechanical Contractors, Inc. | CWJE | Mine contractor | — |
| — | Staco Electric Construction Co., Inc. | CB9444 | Mine contractor | — |
| — | Stacy Equipment and Repairs, Inc. | CK306 | Mine contractor | — |
| — | Stahl Service Solutions LLC | CC9001 | Mine contractor | — |
| — | Stahlnecker's Welding LLC | CC7682 | Mine contractor | — |
| — | Stahura Conveyor Products Inc | CJFQ | Mine contractor | — |
| — | Staker & Parson Companies | CCVE | Mine contractor | — |
| — | Stambaugh's Welding | CF598 | Mine contractor | — |
| — | Stanco Equipment Inc | CXWE | Mine contractor | — |
| — | Standard Laboratories Inc | CCJ4 | Mine contractor | — |
| — | Standard Sand & Silica Company | CG604 | Mine contractor | — |
| — | Stanley Construction Co Inc | CWJA | Mine contractor | — |
| — | Stantec | CQRN | Mine contractor | — |
| — | Stark Fence Company | CA4818 | Mine contractor | — |
| — | Start 2 finish Excavating, LLC | CC9603 | Mine contractor | — |
| — | State 48 Safety LLC | CB6755 | Mine contractor | — |
| — | State Construction Inc | CC139 | Mine contractor | — |
| — | StateFire DC Specialties | CF026 | Mine contractor | — |
| — | STC Safety Training & Compliance LLC | CC2100 | Mine contractor | — |
| — | Steam & Process Repairs Inc | CFJT | Mine contractor | — |
| — | Stedman Machine Company | CA6444 | Mine contractor | — |
| — | Steel and Stone LLC | CC9219 | Mine contractor | — |
| — | Steel City Tire | CD840 | Mine contractor | — |
| — | Steel Drilling LLC | CB7261 | Mine contractor | — |
| — | Steel Revolution Welding LLC | CC8891 | Mine contractor | — |
| — | Steel Systems Installation, Inc. | CCIW | Mine contractor | — |
| — | Steepleton Tire | CA0012 | Mine contractor | — |
| — | Steger Const. Inc | C1TA | Mine contractor | — |
| — | Stehr & Jones Excavation LLC | CD0085 | Mine contractor | — |
| — | Stelter & Brinck, LTD. | CB3727 | Mine contractor | — |
| — | Stence Electric Inc. | CS367 | Mine contractor | — |
| — | Stephen Hartman Excavating Inc | CUSQ | Mine contractor | — |
| — | Stephens Trucking Inc. | CW159 | Mine contractor | — |
| — | Sterling Service Corporation | CR636 | Mine contractor | — |
| — | Steve Benesh & Sons | C3YV | Mine contractor | — |
| — | Steve Boyd & Company, Inc. | CC0608 | Mine contractor | — |
| — | Steve Mahaffey Construction Inc. | CE788 | Mine contractor | — |
| — | Steven A. Carter construction | CC3751 | Mine contractor | — |
| — | Stewart & Tate Inc. | CF157 | Mine contractor | — |
| — | Stewart Bros Drilling | CAH4 | Mine contractor | — |
| — | Stewart Lubricants & Service Co., Inc. | CJGH | Mine contractor | — |
| — | Stillwater Excavating | CT6E | Mine contractor | — |
| — | Stirling Resources, LLC | CC3201 | Mine contractor | — |
| — | Stixx Enterprises LLC | CC4455 | Mine contractor | — |
| — | Stoepfel Drilling LLC | CHMG | Mine contractor | — |
| — | Stone & Sons Electrical Cntr I | CZHC | Mine contractor | — |
| — | Stone Bros Welding | CARX | Mine contractor | — |
| — | Stone Equipment company inc | CB1851 | Mine contractor | — |
| — | Stone Equipment Service | CB4856 | Mine contractor | — |
| — | Stone Express | CS651 | Mine contractor | — |
| — | Stone Products | CA9701 | Mine contractor | — |
| — | Stone Ridge Contracting LLC | CB8717 | Mine contractor | — |
| — | StonebloX LLC | CC5915 | Mine contractor | — |
| — | Stoner heavy duty service llc | CC7930 | Mine contractor | — |
| — | Stoner Industrial Services, Inc. | CJ962 | Mine contractor | — |
| — | Storch Grounds Maintenance | CC6940 | Mine contractor | — |
| — | Storey's Truck Service | CC0009 | Mine contractor | — |
| — | Stout Construction, LLC | CA6370 | Mine contractor | — |
| — | Stout Excavating Group LLC | CB7441 | Mine contractor | — |
| — | Stowers Machinery Corp | CYFX | Mine contractor | — |
| — | Strategic Chemical Solutions, LLC | CA4000 | Mine contractor | — |
| — | Stratified, LLC | CC2688 | Mine contractor | — |
| — | STRAY TRUCKING INC | CC7869 | Mine contractor | — |
| — | Streamline Builders Inc. | CC0769 | Mine contractor | — |
| — | Streamline Industrial Services, LLC | CC2327 | Mine contractor | — |
| — | Streamtech Inc | CC7031 | Mine contractor | — |
| — | Street Plumbing Heating and Electric Inc. | CB8937 | Mine contractor | — |
| — | Stribling Equipment Company I | CA256 | Mine contractor | — |
| — | Stricks Unlimited | CC0081 | Mine contractor | — |
| — | STRITTCO Drill Services LLC. | CB9250 | Mine contractor | — |
| — | Strong Electrical Services, Inc. | CV367 | Mine contractor | — |
| — | Stros North America | CC7247 | Mine contractor | — |
| — | Strouhal Tire Inc | CC491 | Mine contractor | — |
| — | Structural Preservation Systems, LLC | CQ758 | Mine contractor | — |
| — | Stryker Welding | CC4844 | Mine contractor | — |
| — | Sturgeon Electric Co Inc | CS69 | Mine contractor | — |
| — | Stuttle Welding | CB6911 | Mine contractor | — |
| — | Sukut Construction, LLC | CN839 | Mine contractor | — |
| — | Sully-Miller Contracting Co | CFVL | Mine contractor | — |
| — | Sulzer EMS | CBLJ | Mine contractor | — |
| — | Summerlin Scale Co., Inc. | CA1149 | Mine contractor | — |