1999, ISBN: 9781234277635

Rarebooksclub.com. Paperback. New. This item is printed on demand. Paperback. 40 pages. Original publisher: Reston, Va. : U. S. Dept. of the Interior, U. S. Geological Survey, 1999. OC… More...

Rarebooksclub.com. Paperback. New. This item is printed on demand. Paperback. 40 pages. Original publisher: Reston, Va. : U. S. Dept. of the Interior, U. S. Geological Survey, 1999. OCLC Number: (OCoLC)45225383 Subject: Abandoned mines -- Environmental aspects -- Colorado -- San Juan County. Excerpt: . . . It is suggested that little or no reclamation is appropriate at this dump. Access is very difficult. Water does not flow from the shaft ( but presumably seeps into the subsurface ). This small mining operation, like many others in this alpine basin, tested one of the many pyritic alteration zones and a case can be made that this is mostly natural material - simply brought to the surface in the dump. Because there is so much more of this material ( mined and unmined ) in this basin, it seems that reclamation of this dump would have a miniscule effect on the waters in Dry Gulch creek and Cement Creek to the south. Site B022 N235 Rank L: This mining area is known as the Kitti-Mack mine, one of the more famous old-time mines in the north-eastern part of the Upper Animas River watershed. One or more tramways carried ore to mills lower on the mountain: an early one at middle elevation ( probably water powered ), and a newer one at the base ( and which created the fairly large tailings impound near Middleton ). The dump is larger than most on BLM lands, about 9, 000 cubic yards. The dump is more gray than the usual red-brown hues of most dumps in the area, possibly from manganese staining, and contains prominent white quartz fragments. Leach tests of the dump material yielded higher than median amounts of acid, Cu, Fe, Pb, and Zn. The source of the acid and metals is not obvious - but may be in the fine-grained matrix of the dump. Water flows from the collapsed lower adit at a rate of about 30 gpm, and is crudely channeled across the dump. The pH of 6. 3 is much higher than most mine drainages in the study area. Testing the mine drainage in 1998 showed a pH of 5. 5 and somewhat higher conductivity than measured in 1997. Despite the near-neutral pH, th. . . This item ships from La Vergne,TN., Rarebooksclub.com<

1999, ISBN: 9781234277635

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 40 pages. Original publisher: Reston, Va. : U. S. Dept. of the Interior, U. S. Geological Survey, 1999. OCLC N… More...

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 40 pages. Original publisher: Reston, Va. : U. S. Dept. of the Interior, U. S. Geological Survey, 1999. OCLC Number: (OCoLC)45225383 Subject: Abandoned mines -- Environmental aspects -- Colorado -- San Juan County. Excerpt: . . . It is suggested that little or no reclamation is appropriate at this dump. Access is very difficult. Water does not flow from the shaft ( but presumably seeps into the subsurface ). This small mining operation, like many others in this alpine basin, tested one of the many pyritic alteration zones and a case can be made that this is mostly natural material - simply brought to the surface in the dump. Because there is so much more of this material ( mined and unmined ) in this basin, it seems that reclamation of this dump would have a miniscule effect on the waters in Dry Gulch creek and Cement Creek to the south. Site B022 N235 Rank L: This mining area is known as the Kitti-Mack mine, one of the more famous old-time mines in the north-eastern part of the Upper Animas River watershed. One or more tramways carried ore to mills lower on the mountain: an early one at middle elevation ( probably water powered ), and a newer one at the base ( and which created the fairly large tailings impound near Middleton ). The dump is larger than most on BLM lands, about 9, 000 cubic yards. The dump is more gray than the usual red-brown hues of most dumps in the area, possibly from manganese staining, and contains prominent white quartz fragments. Leach tests of the dump material yielded higher than median amounts of acid, Cu, Fe, Pb, and Zn. The source of the acid and metals is not obvious - but may be in the fine-grained matrix of the dump. Water flows from the collapsed lower adit at a rate of about 30 gpm, and is crudely channeled across the dump. The pH of 6. 3 is much higher than most mine drainages in the study area. Testing the mine drainage in 1998 showed a pH of 5. 5 and somewhat higher conductivity than measured in 1997. Despite the near-neutral pH, th. . . This item ships from La Vergne,TN., RareBooksClub<