| 1 | Might not the lead be halfway to a mature state of silverdom? | |
| 2 | Hadn' t twined ores of silver and lead been found? | |
| 3 | Lead ore: British lead ores have been worked since pre-Roman times. | |
| 4 | The effects of organic depressant DMPS on jamesonite and pyrrhotite have been studied. | |
| 5 | Located in north margin of South Shandong orogenic belt, Qibaoshan lead mine is a industrial deposit discovered firstly in the orogenic belt. |