Kedves Kollegak!

Most talaltam az interneten egy peldat meddo leboritasara. Alabb van az info.

Ebben az esetben a Cannon Aranybanya meddoje leboritasarol van szo Washington Allamban.

Eloszor szovott anyaggal takartak le. Utana 3 meter kiskoves homok, utana pedig talajjal. A cikk nem mondja mit ultettek a talajba.

Gondolom a szovott anyag arra van hogy a novenyzet gyokerei ne menjenek a meddobe. Azt nem ertem miert szovott anyag, miert nem muanyag takaro.

Ubul! Itt a megoldas a fasitasi felelmedre!

Udvozlettel, Toth Kalman
New York

http://www.srk.com/news/nov-96/page4.html

Reclamation Cover Design : Monitoring and Optimisation Approach

Rick Frechette
Asamera Minerals, Inc. commissioned SRK to design and supervise the placement of reclamation cover for the tailings disposal complex at the Cannon Gold Mine in Washington State.
Between 1985 and 1994 ore from the underground workings was processed mainly by gravity separation and the resulting concentrate shipped off for smelting elsewhere. The mining operation ceased in 1994, and rehabilitation of the tailings facility began in early 1996.

Because of the area's agricultural importance, effective rehabilitation of the spoil is vital. Following theoretical settlement modelling, a preliminary cover design was developed incorporating a fabric layer on the surface of the tailings, overlain by gravelly sand with an average thickness of about 3 m and a final cover layer of lower permeability soil.

Reclamation cover placement: the progress of the various cover elements
and method of material advance over the support geotextile, is illustrated.
Quarterly monitoring on the dormant impoundment surface by SRK in 1995/96 showed significantly less settlement of the tailings than that predicted by modelling, allowing the average thickness of the gravelly sand layer to be reduced to about 0.75 m prior to constructing the cover.

Rick Frechette of SRK's Denver office, says: "This experience would suggest that it is practical to apply a relatively thin layer of cover on some tailings deposits without impacting the performance of the closure elements. Further research to support the evidence obtained at this project would be helpful for duplicating the approach elsewhere."

A noteworthy aspect of the project was the two-year closure period permitted after cessation of operations in which to optimise the design based on actual tailings settlement data. Given these positive results, monitoring and optimisation should be considered at other properties where tailings reclamation requires placement of a cover.