| Clue | Source | Date |
|---|---|---|
| Processed, as iron ore | Universal | 12 Sep 2021 |
| Processed, as ore | The Washington Post Sunday | 17 Jan 2021 |
| Got the lead out? | Wall Street Journal | 19 Dec 2020 |
| Extracted (metal from ore) | The Times Concise | 09 May 2020 |
| Extracted metal from | Universal | 04 Mar 2018 |
| Reduced to pure metal | LA Times Daily | 06 Oct 2016 |
| Refined | New York Times | 10 May 2016 |
| Did refinery work | USA Today | 28 Dec 2015 |
| Did refinery work | ||
| Refined, as metal | ||
| Extracted metal from | ||
| Refined, as metal | ||
| Refined | ||
| Refined | ||
| Went for the gold? | ||
| Refined metal | ||
| Scorified ore | ||
| Refined, as ore | ||
| Processed ore | ||
| Fused. | ||
| Refined. | ||
| Fused, as ore. | ||
| Fused ore. | ||
| Refined ore. | ||
| Refined, as ore. |