| ASARCO LLC AMARILLO COPPER REFINERY | AMARILLO | TX | Arsenic compounds | 35 | 0 | 1,425 | 78.10% | 17.6% | 54.9% | |
| ASARCO LLC RAY MINE OPERATIONS | KEARNY | AZ | Chromium | 6 | 0 | 165 | 9.05% | 12.1% | 50.2% | |
| ASARCO LLC RAY COMPLEX/ HAYDEN SMELTER & CONCENTRATOR | HAYDEN | AZ | Arsenic compounds | 2 | 0 | 77 | 4.20% | 19.4% | 61.5% | |
| ASARCO LLC MISSION COMPLEX | SAHUARITA | AZ | Chromium | 0 | 0 | 41 | 2.27% | 17.1% | 60.9% | |
| SILVER BELL MINING LLC | MARANA | AZ | Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 3,238 | 0 | 24 | 1.31% | 11.7% | 41.8% | |
| ASARCO LLC AMARILLO COPPER REFINERY | AMARILLO | TX | Nickel compounds | 7 | 0 | 18 | 0.98% | 17.5% | 54.5% | |
| ASARCO LLC RAY COMPLEX/ HAYDEN SMELTER & CONCENTRATOR | HAYDEN | AZ | Chromium compounds (except for chromite ore mined in the Transvaal Region of South Africa and the unreacted ore component of the chromite ore processing residue (COPR). COPR is the solid waste remaining after aqueous extraction of oxidized chromite ore that has been combined with soda ash and kiln roasted at approximately 2,000 F.) | 0 | 0 | 15 | 0.82% | 19.4% | 61.5% | |
| ASARCO LLC AMARILLO COPPER REFINERY | AMARILLO | TX | Copper compounds (this category does not include copper phthalocyanine compounds that are substituted with only hydrogen, and/or chlorine, and/or bromine.) | 3,341 | 0 | 13 | 0.71% | 17.6% | 54.8% | |
| ASARCO LLC RAY MINE OPERATIONS | KEARNY | AZ | Copper compounds (this category does not include copper phthalocyanine compounds that are substituted with only hydrogen, and/or chlorine, and/or bromine.) | 5,230 | 0 | 12 | 0.65% | 12.1% | 50.2% | |
| ASARCO LLC RAY MINE OPERATIONS | KEARNY | AZ | Nickel | 5 | 0 | 9 | 0.48% | 12.1% | 50.2% | |
| ASARCO LLC AMARILLO COPPER REFINERY | AMARILLO | TX | Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 663 | 0 | 6 | 0.35% | 17.6% | 54.9% | |
| ASARCO LLC RAY MINE OPERATIONS | KEARNY | AZ | Lead compounds | 143 | 0 | 6 | 0.34% | 12.1% | 50.2% | |
| ASARCO LLC MISSION COMPLEX | SAHUARITA | AZ | Lead compounds | 12 | 0 | 5 | 0.28% | 17.0% | 61.0% | |
| ASARCO LLC AMARILLO COPPER REFINERY | AMARILLO | TX | Lead compounds | 72 | 0 | 4 | 0.24% | 17.5% | 54.7% | |
| ASARCO LLC MISSION COMPLEX | SAHUARITA | AZ | Nickel | 0 | 0 | 1 | 0.06% | 17.1% | 60.9% | |
| ASARCO LLC MISSION COMPLEX | SAHUARITA | AZ | Manganese | 5 | 0 | 1 | 0.06% | 17.1% | 60.9% | |
| ASARCO LLC RAY MINE OPERATIONS | KEARNY | AZ | Manganese | 21 | 0 | 0 | 0.03% | 12.1% | 50.2% | |
| ASARCO LLC RAY MINE OPERATIONS | KEARNY | AZ | Mercury compounds | 20 | 0 | 0 | 0.03% | 12.1% | 50.2% | |
| ASARCO LLC RAY COMPLEX/ HAYDEN SMELTER & CONCENTRATOR | HAYDEN | AZ | Copper compounds (this category does not include copper phthalocyanine compounds that are substituted with only hydrogen, and/or chlorine, and/or bromine.) | 135 | 0 | 0 | 0.03% | 19.7% | 61.7% | |
| ASARCO LLC RAY COMPLEX/ HAYDEN SMELTER & CONCENTRATOR | HAYDEN | AZ | Lead compounds | 6 | 0 | 0 | 0.02% | 19.3% | 61.3% | |
| ASARCO LLC MISSION COMPLEX | SAHUARITA | AZ | Copper compounds (this category does not include copper phthalocyanine compounds that are substituted with only hydrogen, and/or chlorine, and/or bromine.) | 7 | 0 | 0 | 0.01% | 16.5% | 61.6% | |
| ASARCO LLC MISSION COMPLEX | SAHUARITA | AZ | Ammonia (includes anhydrous ammonia and aqueous ammonia from water dissociable ammonium salts and other sources; 10 percent of total aqueous ammonia is reportable under this listing) | 530 | 0 | 0 | 0.00% | 17.1% | 60.9% | |
| ASARCO LLC RAY COMPLEX/ HAYDEN SMELTER & CONCENTRATOR | HAYDEN | AZ | Manganese compounds | 1 | 0 | 0 | 0.00% | 19.4% | 61.5% | |
| SILVER BELL MINING LLC | MARANA | AZ | Copper compounds (this category does not include copper phthalocyanine compounds that are substituted with only hydrogen, and/or chlorine, and/or bromine.) | 8 | 0 | 0 | 0.00% | 11.8% | 41.1% | |
| ASARCO LLC RAY COMPLEX/ HAYDEN SMELTER & CONCENTRATOR | HAYDEN | AZ | Zinc compounds | 20 | 0 | 0 | 0.00% | 19.4% | 61.5% | |
| ASARCO LLC MISSION COMPLEX | SAHUARITA | AZ | Mercury compounds | 0 | 0 | 0 | 0.00% | 16.7% | 61.2% | |
| SILVER BELL MINING LLC | MARANA | AZ | Lead compounds | 0 | 0 | 0 | 0.00% | 11.7% | 41.9% | |