| MPMidwest Perlite Company, Inc. | Appleton | WI | — | ◇ UNVERIFIED |
| MLM-i LLC - Amelia Grinding & Bulk Storage Facility | Amelia | LA | — | ◇ UNVERIFIED |
| MQMillville Quarry | Baltimore | MD | — | ◇ UNVERIFIED |
| MSMi Swaco Greystone Barite Mine | Battle Mountain | NV | — | ◇ UNVERIFIED |
 Mmc Materials INC | Memphis | TN | — | ◇ UNVERIFIED |
| MMultiserv | Birmingham | AL | — | ◇ UNVERIFIED |
| M1Multiserv/plt 18 Steelton | Steelton | PA | — | ◇ UNVERIFIED |
| MKMurray Keystone Processing Inc/keystone Cleaning Plt | Indiana | PA | — | ◇ UNVERIFIED |
| NLNanocor LLC | Aberdeen | MS | — | ◇ UNVERIFIED |
| NSNevada Slag, INC | Mcgill | NV | — | ◇ UNVERIFIED |
| NENew Enterprise Stone & Lime CO Inc/fairfield | Cumberland | PA | — | ◇ UNVERIFIED |
| NPNorcal Perlite, Inc. | Bakersfield | CA | — | ◇ UNVERIFIED |
| NANorth American Recycling and Crushing LLC | Anaheim | CA | — | ◇ UNVERIFIED |
| NANorth American Recycling & Crushing, LLC. | Colton | CA | — | ◇ UNVERIFIED |
| NSNortheast Solite Corporation | Mount Marion | NY | — | ◇ UNVERIFIED |
| NSNorth Star Water Treatment Facility | Grass Valley | CA | — | ◇ UNVERIFIED |
| ONOil-dri North and South Plant | Ochlocknee | GA | — | ◇ UNVERIFIED |
| OTOil Technology INC | East Chicago | IN | — | ◇ UNVERIFIED |
| OVOmya Verpol Plant | Florence | VT | — | ◇ UNVERIFIED |
| OMOpta Minerals Harseeville Plant | Hardeeville | SC | — | ◇ UNVERIFIED |
| OPOswego Public Works Department | Oswego | NY | — | ◇ UNVERIFIED |
| OCOzinga Cement Incorporated Contractor of Cleveland-cliffs Bu | Burns Harbor | IN | — | ◇ UNVERIFIED |
| OSOzinga Slag LLC | East Chicago | IN | — | ◇ UNVERIFIED |
| PCPacific Custom Materials | Stockton | CA | — | ◇ UNVERIFIED |
| PVPalmetto Vermiculite | Woodruff | SC | — | ◇ UNVERIFIED |
| PSPauls Station of Webster | Rochester | NY | — | ◇ UNVERIFIED |
| PTPebble Technology International | Pearl River | LA | — | ◇ UNVERIFIED |
| PRPenn Rock Aggregates | North Versailles | PA | — | ◇ UNVERIFIED |
| PSPennsy Supply Summit Sta/quarry Wayne Twp | Summit Station | PA | — | ◇ UNVERIFIED |
| PPPerlite Processing Plant | Fallon | NV | — | ◇ UNVERIFIED |
| PVPerlite Vermiculite Packaging Industries INC. | North Bloomfield | OH | — | ◇ UNVERIFIED |
| PSPhoenix Services LLC | Roanoke | VA | — | ◇ UNVERIFIED |
| PIPlacerville Industries | Placerville | CA | — | ◇ UNVERIFIED |
| PSPreferred Sands of Minnesota LLC | Woodbury | MN | — | ◇ UNVERIFIED |
| PIPvp Industries INC. | North Bloomfield | OH | — | ◇ UNVERIFIED |
| RERamrock Environmental | Stockton | CA | — | ◇ UNVERIFIED |
| RBRecology Blossom Valley Organics - South | Lamont | CA | — | ◇ UNVERIFIED |
| RARecycled Aggregate Materials Company INC | Sun Valley | CA | — | ◇ UNVERIFIED |
| RIRedco Ii | North Hollywood | CA | — | ◇ UNVERIFIED |
| RRReflective Recycling of Sc LLC | Pacolet | SC | — | ◇ UNVERIFIED |
| RIRm Industrials - Rm Rail Park Recycle Op | Aurora | CO | — | ◇ UNVERIFIED |
| RIRoss Island Hardtack Island Plant | Portland | OR | — | ◇ UNVERIFIED |
| SPSaint-gobain Proppants (lr) | Benton | AR | — | ◇ UNVERIFIED |
| SCSgl Carbon, LLC | Saint Marys | PA | — | ◇ UNVERIFIED |
| SCSilbrico Corp/easton | Forks Township | PA | — | ◇ UNVERIFIED |
| SCSilbrico Corporation | Brunswick | GA | — | ◇ UNVERIFIED |
| SPSilicon Processors, Inc., Parkersburg | Parkersburg | WV | — | ◇ UNVERIFIED |
| SMSkyline Metals Llc/slag Processing Plt | Baden | PA | — | ◇ UNVERIFIED |
| SCSkyway Cement CO LLC | Chicago | IL | — | ◇ UNVERIFIED |
| SPSlag Plant | El Paso | TX | — | ◇ UNVERIFIED |
