Laserfiche WebLink
- Tetrahedrite (Cu12Sb4S13) with a variant freibergite which has some silver (Ag) replacing some <br />of the copper. <br />It is expected that these minerals will comprise approximately 20 -40% of the vein material. The <br />wall rock around the veins is primarily andesite, which is a very fine granite, consisting of <br />quartz, feldspar, amphiboles, biotite and muscovite mica. Since the milling process will primarily <br />extract the sulfide minerals, the tailings will consist of quartz, feldspar, amphiboles, biotite and <br />muscovite, which are inert minerals. <br />2. Underground Operations <br />The vast majority of activity at the Revenue Mine will take place underground. This includes <br />mining of ore, transport of ore and waste, and processing of ore in the mill. <br />2.1 Drifts and Tunnels <br />All of the accessible drifts and tunnels at the Revenue were driven on roughly 0.5% uphill grade <br />from the portal over 100 years ago and are 8 "X 8" in size with a 24" wide set of 401b rail on the <br />left side of the opening and a drainage ditch on the right side. The main Revenue tunnel was <br />driven to access a number of veins and was driven in the andesite host rock of the San Juan <br />Formation. This drift is approximately 7900 feet long and accesses the Yellow Rose vein, the <br />Atlas/Cumberland Vein, Terrible Vein, Montana Vein and the Virginius Vein, as well as a few <br />minor veins. The main Revenue tunnel basically ends at the Virginius Vein. The main Virginius <br />shaft is located near the terminus of the Revenue drift. This shaft extends up to the surface at an <br />elevation 12,900 feet (Map C -5). The extent of the underground workings is not fully known and <br />will only be known after further rehabilitation of the existing tunnels. Large amounts of ore were <br />brought to the surface through the revenue tunnel where a large mill was located on the eastern <br />edge of the permit area. Power cable, phone lines, compressed air line and ventilation piping is <br />attached over the center of the track or over the drainage ditch using a messenger cable that is <br />pinned to the back or ribs with steel I- bolts. The track is secured to 6' X 8' wood ties on 5' <br />Revenue Mine August 2012 D - <br />