| 21. | Much of the terrain is still loose dirt, interspersed with sandstone and occasional quartz veins.
|
| 22. | The quartz vein mines became depleted around the time Idaho became a state in 1890.
|
| 23. | Big Hurrah originally opened in 1908, an underground mine exploiting large quartz veins cutting black slates.
|
| 24. | The main quartz vein is at least } } long and up to } } wide.
|
| 25. | Auriferous quartz veins were subsequently found in surface exposures at the site of the current open pit.
|
| 26. | It is found in sulfide bearing quartz veins in Colorado and with siderite-rich cryolite in Ivigtut, Greenland.
|
| 27. | Badakshan is the largest and most studied of the known gold-bearing quartz veins systems in the region.
|
| 28. | AD 500 700 and is slate, with quartz veins and measures 132 ?51 ?13 cm.
|
| 29. | It crystallizes in the tetragonal crystal system and forms as rounded dissemations within tetrahedrite in quartz veins.
|
| 30. | Mineralization produced gold-bearing quartz veins, and relics of past gold mining activities are still present in the area.
|
