| IIsolatek-Stanhope | Stanhope | NJ | 20–99 | ◐ LIKELY ACTIVE |
| MMansfield | Seven Fields | PA | 20–99 | ◐ LIKELY ACTIVE |
| MMidlothian | Seven Fields | PA | 20–99 | ◐ LIKELY ACTIVE |
| NINorthdown Industires - Phoenix | Phoenix | AZ | 1–19 | ◐ LIKELY ACTIVE |
| NKNucor Kingman | Seven Fields | PA | 1–19 | ◐ LIKELY ACTIVE |
| OBOpta Birmingham Plant | Birmingham | AL | 1–19 | ◐ LIKELY ACTIVE |
| OOPTA-Cortland | Cortland | OH | 1–19 | ◐ LIKELY ACTIVE |
| OEOPTA East Chicago Plant | East Chicago | IN | 1–19 | ◐ LIKELY ACTIVE |
| OOPTA-Warren | Warren | OH | 1–19 | ◐ LIKELY ACTIVE |
| OCOTK Calvert | Seven Fields | PA | 20–99 | ◐ LIKELY ACTIVE |
| PVPolymer Valley Chemicals | Macon | GA | 20–99 | ◐ LIKELY ACTIVE |
| PLPromising LLC | Lincoln | NE | — | ◐ LIKELY ACTIVE |
| PPueblo | Seven Fields | PA | 20–99 | ◐ LIKELY ACTIVE |
| PNPVP North Bloomfield | North Bloomfield | OH | 20–99 | ◐ LIKELY ACTIVE |
| RMReed Minerals - Gallipolis | Chesire | OH | 1–19 | ◐ LIKELY ACTIVE |
| RMReed Minerals, LLC - Houston | Houston | TX | 1–19 | ◐ LIKELY ACTIVE |
| RMReed Minerals, LLC - LaCygne | La Cygne | KS | 1–19 | ◐ LIKELY ACTIVE |
| SSarver | Seven Fields | PA | 20–99 | ◐ LIKELY ACTIVE |
| SPSDI Pittsboro | Seven Fields | PA | 20–99 | ◐ LIKELY ACTIVE |
| SVSpecialty Vermiculite Corp | Phoenix | AZ | 1–19 | ◐ LIKELY ACTIVE |
| SISSAB Iowa | Seven Fields | PA | 20–99 | ◐ LIKELY ACTIVE |
| SSteelton | Seven Fields | PA | 1–19 | ◐ LIKELY ACTIVE |
 Syrah Technologies | Vidalia, La. 70735 | LA | 20–99 | ◐ LIKELY ACTIVE |
| TETherm-O-Rock East, Inc. | New Eagle | PA | 20–99 | ◐ LIKELY ACTIVE |
| TSThe Schundler Company | Nahant | MA | — | ◐ LIKELY ACTIVE |
| NPNor-cal Perlite INC | Richmond | CA | — | ◇ UNVERIFIED |
| TWTherm-o-rock West INC | Chandler | AZ | — | ◇ UNVERIFIED |
| 2C2r Construction Midway Site | Shreveport | LA | — | ◇ UNVERIFIED |
| AWAa Will Sand & Gravel | Canton | MA | — | ◇ UNVERIFIED |
| ACAcc Ca INC Dba Arcosa Crushed Concrete | Rialto | CA | — | ◇ UNVERIFIED |
| AAAero Aggregates | Modesto | CA | — | ◇ UNVERIFIED |
| AIAggregate Industries Swr, INC. - Utelite Plant | Coalville | UT | — | ◇ UNVERIFIED |
| ACAllied Concrete Products LLC - Arvonia | Arvonia | VA | — | ◇ UNVERIFIED |
| AIAlmatis Inc/neville Grinding Ctr | Leetsdale | PA | — | ◇ UNVERIFIED |
| ABAmerican Borate CO Dunn Plant | Ludlow | CA | — | ◇ UNVERIFIED |
| ABAmerican Borate Co, Dunn Plant | 35m Ne Barstow I-15 | CA | — | ◇ UNVERIFIED |
| ACAmerican Colloid CO | Albion | MI | — | ◇ UNVERIFIED |
| ACAmerican Colloid CO | Granite City | IL | — | ◇ UNVERIFIED |
| ACAmerican Colloid Co./cetco | Fairmount | GA | — | ◇ UNVERIFIED |
| ACAmerican Colloid Company | Paris | TN | — | ◇ UNVERIFIED |
| ACAmerican Colloid Co-waterloo | Waterloo | IA | — | ◇ UNVERIFIED |
| AGAmerican Garden Perlite LLC | Lake Wales | FL | — | ◇ UNVERIFIED |
| APAmerican Perlite Company | Big Pine | CA | — | ◇ UNVERIFIED |
| APAmerican Perlite Company | Big Pine | CA | — | ◇ UNVERIFIED |
| ANApac Newton Grinding Mill Plant | Newton | KS | — | ◇ UNVERIFIED |
| ALArcosa Lightweight - West Memphis | Proctor | AR | — | ◇ UNVERIFIED |
| ALArcosa Lw Br, LLC. - Livingston | Livingston | AL | — | ◇ UNVERIFIED |
| ARAshland Recovery INC Plant 125 | Ashland | KY | — | ◇ UNVERIFIED |
| ASAustin South Plant | Austin | TX | — | ◇ UNVERIFIED |
| BQBangor Quarry | Bangor | CA | — | ◇ UNVERIFIED |
| BMBarretts Minerals INC Wellsville Plant | Wellsville | OH | — | ◇ UNVERIFIED |
| BMBattle Mountain Grinding Plant | Battle Mountain | NV | — | ◇ UNVERIFIED |
| BBB & B Cedar Company, INC. | Waldron | AR | — | ◇ UNVERIFIED |
| BMBecker Minerals INC | Cheraw | SC | — | ◇ UNVERIFIED |
| BSBeemsterboer Slag CORP Contractor of Ar | East Chicago | IN | — | ◇ UNVERIFIED |
| BSBeemsterboer Slag Corporation a Contrac | Burns Harbor | IN | — | ◇ UNVERIFIED |
| BRBig River Industries Gravelite Division | Erwinville | LA | — | ◇ UNVERIFIED |
| BIBird Incorporated Granular | Norwood | MA | — | ◇ UNVERIFIED |
| BMBluegrass Materials Texas Quarry | Cockeysville | MD | — | ◇ UNVERIFIED |
| BDBo Dean CO INC - Windsor Recycle Plant | Windsor | CA | — | ◇ UNVERIFIED |
| BIB.p.i. (by-product Industries), INC. | Bessemer | AL | — | ◇ UNVERIFIED |
| BRBuellflat Rock Company | Solvang | CA | — | ◇ UNVERIFIED |
| BIBurrell Industries INC. | New Kensington | PA | — | ◇ UNVERIFIED |
| CICalclean, INC. | Vacaville | CA | — | ◇ UNVERIFIED |
| CICanam Industries | Lovelock | NV | — | ◇ UNVERIFIED |
| CCCarbo Ceramics INC | New Iberia | LA | — | ◇ UNVERIFIED |
| CCCarbo Ceramics INC - Marshfield Plant | Marshfield | WI | — | ◇ UNVERIFIED |
| CCCarbo Ceramics INC. - Mcintyre Plant | Mcintyre | GA | — | ◇ UNVERIFIED |
| CGCarlton Global | Dunn | CA | — | ◇ UNVERIFIED |
| CPCarolina Perlite Company, INC. | Gold Hill | NC | — | ◇ UNVERIFIED |
| CPCarolina Perlite Company, INC. | Gold Hill | NC | — | ◇ UNVERIFIED |
| CSCarolina Stalite CO Aquadale Properties | Norwood | NC | — | ◇ UNVERIFIED |
| CCCarus Chemical CO | Ottawa | IL | — | ◇ UNVERIFIED |
| CCCastle Concrete CO Queens Canyon Quarry | Colorado Springs | CO | — | ◇ UNVERIFIED |
| CCCelite Corporation | Quincy | WA | — | ◇ UNVERIFIED |
| CMC-e Minerals Plants 1,2 and 6 | Andersonville | GA | — | ◇ UNVERIFIED |
| CMCharleston Mill Service | Huger | SC | — | ◇ UNVERIFIED |
| CMCharleston Mill Service | Huger | SC | — | ◇ UNVERIFIED |
| CPCimbar Performance Minerals | Mount Vernon | IN | — | ◇ UNVERIFIED |
| CMCity Materials Services, INC. | Hermitage | PA | — | ◇ UNVERIFIED |
| CCClariant Corporation - Quincy Operation | Quincy | FL | — | ◇ UNVERIFIED |
| CEClodine Expanded Shale & Clay Products | Richmond | TX | — | ◇ UNVERIFIED |
| CNC & N CORP. | Galena | KS | — | ◇ UNVERIFIED |
| CWCoast Wide Ready Mix | Tillamook | OR | — | ◇ UNVERIFIED |
| CMColeman Manufacturing | Everett | MA | — | ◇ UNVERIFIED |
| CMColombo Mine | Sierra City | CA | — | ◇ UNVERIFIED |
| CEComax Enterprises, INC. | Riverdale | IL | — | ◇ UNVERIFIED |
| CCContract Crushing Const - Patton Site | Belle Vernon | PA | — | ◇ UNVERIFIED |
| CICoorstek, Inc.- South Table Mountain | Golden | CO | — | ◇ UNVERIFIED |
| CLCornerstone - Lakeview Process Site | Lakeview | OR | — | ◇ UNVERIFIED |
| CICovia Isp, INC. | Fort Smith | AR | — | ◇ UNVERIFIED |
| CPCumberland Property | Cumberland | WA | — | ◇ UNVERIFIED |
| DSDennis Stewart Equipment Rental INC - Portable Crusher | Baton Rouge | LA | — | ◇ UNVERIFIED |
| DMDicaperl Minerals CORP. | Nashville | TN | — | ◇ UNVERIFIED |
| DMDicaperl Minerals Corporation | Socorro | NM | — | ◇ UNVERIFIED |
| DSDixon Southwestern Graphite INC | Lakehurst | NJ | — | ◇ UNVERIFIED |
| DDDracola Drilling and Completion Laboratory | Grand Forks | ND | — | ◇ UNVERIFIED |
| DSDuffek Sand & Gravel INC | Antigo | WI | — | ◇ UNVERIFIED |
| DSDuke Sherwood Contracting, INC. | Oroville | CA | — | ◇ UNVERIFIED |
| DQDunstone Quarry | Oroville | CA | — | ◇ UNVERIFIED |
