| 21. | "' Fire-setting "'is a method of traditional mining used most commonly from underground workings without adequate ventilation.
|
| 22. | A adit was cut in the 1890s, which provided natural drainage for much of the underground workings.
|
| 23. | This did not prevent Queen Victoria visiting the underground workings on an 1846 visit to Polperro . }}
|
| 24. | Surface quarries were also opened; they outlasted the underground workings and were last used in the early 1920s.
|
| 25. | Shortly after their arrival, Pineiro was engrossed in the pro-Castro underground working to overthrow the dictator Fulgencio Batista.
|
| 26. | The project includes an open pit, underground workings, historic support facilities, a new concentrator and recently constructed tailings facility.
|
| 27. | Such methods could be very effective in opencast mining, but fire-setting was very dangerous when used in underground workings.
|
| 28. | There are many ancient open pit and underground workings that show that this area has been mined in the past.
|
| 29. | He lived on Oak Island for a summer and possessed firsthand knowledge of the underground workings through his own observations.
|
| 30. | At its peak, during World War I, Westville boasted three underground workings; the Black Diamond, the Acadia, and the Drummond.
|