| Clue | Source | Date |
|---|---|---|
| Containing smelting waste | Premier Sunday | 15 Oct 2023 |
| Worthless | The Washington Post Sunday | 29 Sep 2019 |
| Without worth | Wall Street Journal | 11 Jan 2018 |
| Full of worthless stuff | ||
| Full of impurities | ||
| Full of worthless stuff | ||
| Full of impurities | ||
| Full of impurities | ||
| Worthless | ||
| Worthless | ||
| Full of impurities | ||
| Full of slag. | ||
| Worthless. |