My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
REP21401
DRMS
>
Back File Migration
>
Report
>
REP21401
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 11:54:47 PM
Creation date
11/27/2007 3:08:01 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981025
IBM Index Class Name
Report
Doc Name
PASSIVE MINE DRAINAGE TREATMENT
Media Type
D
Archive
No
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
6
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
r/ <br />~;' . - :. <br />r <br /> <br />observed. figure 1 pre sent• these findings in <br />graphic form. <br /> ligure 1 <br />Ma rshalld 5 P1lDt System Pe rformance Date <br />pH ~Fe'21 <br /> pH (ug/1) <br />7.5 <br />~ 4000 <br />7.0 <br />' 7500 <br />6.5 3000 <br />6.0 / <br />Iron 2000 <br />5.5 1000 <br />5.0 500 <br />4.5 100 <br />rar belor this rd Eour[h ' <br />mine bog rater rater <br />rater ou[flor [all Eell <br />•L7a ter quality results •re presented [or <br />treatment hors of 6-10 gpm, during the period <br />of 8/84 to 7/85. _ <br />PMDT Sya[em Maintenance Corte <br />The total cation exchange capacity of the peat <br />and or ocher ad sorbtive mad i• included in the <br />P`fDT system appears to be the crit is el element <br />of [he sy stem from a maintenance point o[ vier. <br />This assume^ [ha[ the bog is sised appropriately <br />Ear the quality and volume of racer Deing <br />dische rged from the mine. It excessive <br />disehe rges of mine rater are routed through the <br />bog, insuff isfen[ me cal removal rill occur and <br />[he limestone Dlaced in [he dornstream channel <br />rill become coated rayid ly. Yhen this happens <br />the limestone i^ tendered completely ineffective <br />and must be replaced or supplemented immed fat sly. <br />The Marshall IS bog con[ain• aDprox ima[ely 75 <br />cubit yards of peat. Civen the concen[ration• <br />of metal ion• in [he 6-10 gpm discharge and <br />^sauming • total cation exchange capacity of 200 <br />meq/100 gm dry pea[, the bog ehou ld function <br />richout peat replacement for apprmxim[e1y 3 <br />years.. This •s sumea no biological removal of <br />metal ion• by the ta[te it a, sedge grasses, and <br />rushes rh ich are becoming eataDl lshed atop the <br />bog. <br />The PMDT system installed •t the Thosryaon I2 <br />Mine vas designed to operate for • period of tro <br />years richout major maintenance (eg. peat rep- <br />Ltement). Frequent inspec[iona of bath •yrtems <br />are conducted ms in ]y to insure proper operation <br />of voter handling devices. <br />Financing Maintenance Costa <br />Every PMDT ay stem rill require maintenance cork <br />at some interval. Recycling the metal laden <br />peer in [he fertilizer aurket• after removal end <br />proper composting end blending could reduce peat <br />replacement torts. Pre lininary discussions rich <br />local fertil ices •upplien indicate [his may <br />indeed be you ible.17 Use of dried •ernge <br />sludge, rood chips end other organic mete rial •s <br />pee[ extender may reduce costa uaoc sated rich <br />the bog. <br /> <br />su in[ensnce bond or diversified Lund at the time <br />o! system construction is [he suggested means of <br />providing for long Germ PMD7 maintenance caeca <br />•t abandoned mines. The bond or fund ehou ld <br />generate Buff is sent income to yrevide for pee[ <br />and limestone replatemen[ •[ the proper <br />frequency interval. This interval is determined <br />by the trit<ri• used (ot •ieing the •rt if is sal <br />bog. Limestone replacements or supplements may <br />be needed on ^ more frequent basis. This i• <br />accomplished at relatively lw cost. <br />Cone luaiona <br />Ir0 PHDT sy at ems operating in Colorado, offer a <br />cost effective means of removing toxic metals <br />^nd acidity from mine discharges. The Marshall <br />AS PHDT neutralises the •cid sty and removes 99Z <br />of the total iron concentration in~ the mine <br />drainage •[ a design flor o[ 14,400 gpd. <br />Yhi le the initial design coats for thi• ay ecem <br />sere sub st an[ial •t 114,700.00, they were not <br />high relative to conventional mine eater <br />treatment system design costs. Construction <br />costs for th is prototype system exceeded <br />117,000.00. Yet the ee costs •lao Eall tar belor <br />the range accepted for conventional ey stems. <br />Conventional mint drainage treatment evstem <br />design torts •re often based on a percentage of <br />initial capital construction coats. <br />Construction costa for one conventional lime/ <br />pLin •e [[ling treacmen[ plane dtaigned [o treat <br />.2 cfa of mine drainage in Colorado ve re <br />est heated •t 1150-200,000. Annual maintenance <br />costa of 118,000 re re ^nticipaced .l4 This <br />concraets ri [h construction caste of 117,535.00 <br />and expel Led maintenance caste for the Marshall <br />d5 P(IDT system of 12,298.00 per year. An <br />interest bearing maintenance fund or bond <br />established rich 125,000.00 in foie sal capital <br />should provide for long term monitoring and <br />maintenance of the system (barring unforeseen <br />cost increases Eor pea[ and limestone). <br />The Thomp!on PMDT sy ecem sae dtaigned a[ • toot <br />of 17,790.00. A greet deal o[ the data required <br />for ay ecem design raa •vailaDle from existing <br />source e. The tons[ruction o[ Che na[em vas <br />•ecomplished for a toot of 117,170.00. <br />Annualized maintenance costa of 17900.00 are <br />anticipated. Yates quality monitoring has only <br />recently begun. A maintenance Eund established <br />rich 142,000.00 in initial tapir •1 should <br />provide auf(ic Tent inc mme to cover long Germ <br />~eaintenante costa, usuming the system Derforme <br />u du igned. <br />Referene es <br />1. Eger, P., R. Lapakko, 1980. "Trace Metal <br />Dpcake by Peat: Interaction of • Yh ice Cedar Log <br />and Mining Stockpile Leachate". Proceed inRe <br />Sixth International Peat Conpresa. <br />2. Rolm, J. D., M. L. Lishap, "Passive Mine <br />Drainage Treatment: Selected Gse Scudie s", <br />Medina, A., Andersen, M., (Editors). <br />Esubliahment of a system monitoring and <br />
The URL can be used to link to this page
Your browser does not support the video tag.