| Clue | Source | Date |
|---|---|---|
| Tersely about thousand included at plant (8) | ||
| Plant regulated by the EPA | Newsday | 16 Jul 2022 |
| Place of refinement | Wall Street Journal | 06 Apr 2017 |
| Became aware of Beryl unclothed at the metal works | ||
| Ore-processing plant | ||
| Ore-processing plant | ||
| Place of refinement | ||
| Place of refinement | ||
| Place of refinement | ||
| Refining center | ||
| Place of refinement | ||
| Refining plant | ||
| Pittsburgh sight |