| Main Title |
Superfund record of decision : Silver Mountain Mine, WA. |
| CORP Author |
United States. Environmental Protection Agency. |
| Publisher |
U.S. Environmental Protection Agency, Office of Emergency and Remedial Response ; Reproduced by National Technical Information Service, |
| Year Published |
1990 |
| Report Number |
EPA/ROD/R10-90/022 |
| Stock Number |
PB90-235870 |
| OCLC Number |
32276312 |
| Subjects |
Hazardous waste sites--Washington
|
| Additional Subjects |
Earth fills ;
Industrial wastes ;
Hazardous materials ;
Waste disposal ;
Site surveys ;
Licenses ;
Public health ;
Water pollution ;
Solid waste disposal ;
Arsenic ;
Cyanides ;
Cost analysis ;
Mining ;
Superfund program ;
Silver Mountain Mine(Washington) ;
Liquid waste disposal ;
Leachate ;
Record of Decision ;
First Remedial Action ;
Okanogan County(Washington)
|
| Internet Access |
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| ELBD RPS |
EPA ROD-R10-90-022 |
repository copy |
AWBERC Library/Cincinnati,OH |
10/17/2014 |
| NTIS |
PB90-235870 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
1 v. (various pagings) : ill. ; 28 cm. |
| Abstract |
The five-acre Silver Mountain Mine site is an abandoned mine dump in Okanogan County, north-central Washington. Land in the site vicinity is used primarily for cattle grazing, and the nearest well, two miles away, is used for cattle watering and irrigation. The nearest residence is three miles south of the site. Operations at the mine were initiated in 1902 to extract silver, gold, and copper from soil and ore. From 1980 to 1981, a cyanide leach heap of previously mined material was constructed in an attempt to extract (leach out) silver and gold. The heap consisted of 5,300 tons of ore on top of a 20 ml plastic liner. About 4,400 pounds of sodium cyanide was mixed with water and sprayed on the top of the heap. The cyanide-laden effluent was then collected in a leachate pond at the base of the heap. The heap leaching operation was abandoned in late 1981 without cleanup of contaminated material. In addition, approximately 5,200 tons of unprocessed mixed material (mine dump) lie to the west of the leach heap. In 1982, the State took action to treat the cyanide at the site using sodium hypochlorite to partially neutralize the leachate pond and heap. In 1985, the State conducted a site stabilization effort, which included removal of liquids from the leachate pond and installation of a 33 ml plastic cover over the heap and pond. |
| Notes |
Cover title. "3/27/90." "PB90-235870." "EPA/ROD/R10-90/022." "March 1990." |
| Place Published |
Washington, D.C. Springfield, VA |
| Corporate Au Added Ent |
United States. Environmental Protection Agency. Office of Emergency and Remedial Response. |
| PUB Date Free Form |
1990 |
| NTIS Prices |
PC A03/MF A01 |
| BIB Level |
m |
| Cataloging Source |
OCLC/T |
| OCLC Time Stamp |
20130501154853 |
| Language |
eng |
| Origin |
OCLC |
| Type |
MERGE |
| OCLC Rec Leader |
01239cam 2200313Ka 45020 |
