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Reclamation Feasibility Report"- Virginia Canyon <br />This waste pile is located directly in Seaton Gulch below a road culvert that directs road drainage <br />onto the pile. There is very little runoff from the headwaters of Seaton Gulch above. The drainage <br />from the headwaters is collected by the road ditches and conveyed onto the waste pile. Deep <br />gullies have been cut in the face of this pile. Where soil has eroded onto the waste, there is some <br />vegetation. <br />The waste rock at this site had the highest soluble manganese of all the sites tested, with high <br />cadmium, copper and zinc concentrations. Sulfate salts and secondary sulfates were present at the <br />toe of the pile, indicating that some leaching of heavy metals from this pile occurs. This is probably <br />principally during snowmelt. Results from the 2:1 leachate analysis are given below. <br />Site #53 <br />pH <br />S. U. Total Acidity As <br />D Cd <br />D Cu <br />D Fe <br />D Mn <br />D Pb <br />D Zn <br />b <br />2.82 577 BDL 360 6300 6200 180000 53 53000 <br />Reclamation Measures <br />Removal of the waste rock is the preferred reclamation alternative. The only other alternative would <br />be to construct a drainage over the pile, such as a concrete flume. In order for removal to be cost- <br />effective, a nearby disposal site would have to be available. The removal area will have to be <br />amended with ground limestone and lime before revegetation. As an alternative, an engineered <br />concrete channel can be constructed over and around the waste rock pile. <br />Doves Nest Mine (Site #67) <br />?ocatio n <br />This site is located near the headwaters of Boomerang Gulch directly above the upper road <br />bisection of the stream channel (Figures 3 and 18). This waste pile was sampled as site #67. Water <br />quality station VC-14 is located at the bottom of this waste pile. Site #67 is located at LAT. N390 45' <br />46.1 ", LONG. W1050 31' 17.7". The estimated volume of waste rock is 12,800 cubic yards <br />Historic Structures <br />There are no historic structures or debris at this site. Most of the waste rock pile was pushed down <br />to the county road in the recent past. <br />Water Quality Impacts <br />The waste rock from the Doves Nest mine was pushed into the headwaters drainage of Boomerang <br />Gulch in the recent past. As a result, much of the waste is eroded and leached by runoff from above <br />the site. A water quality sample was collected at station VC-14 in August of 2000. Over 40 pounds <br />of total metals per hour were coming from this site. The dissolved metals loading rate was almost 9 <br />pounds per hour. The majority of the heavy metals loading was composed of zinc, iron and <br />aluminum. <br />The waste rock at this site had a very low pH and was highly acid forming. The deionized water <br />extract showed much lower metals content relative to the other mine sites, than the total digestion. <br />This tends to indicate that some of the metal sulfides are in a relatively insoluble form. Results from <br />the 2:1 leachate analysis are given below: <br />Site #67 <br />T. pH <br />s.u. Total Acidity <br />m /I As <br />b Cd <br />b Cu <br />b Fe <br />b Mn <br />b Pb <br />b Zn <br />b <br />2.31 5070 BDL 13 170 22000 2200 180 2100 <br />40