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GENERAL40780
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GENERAL40780
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Last modified
8/24/2016 7:59:54 PM
Creation date
11/23/2007 10:51:33 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
General Documents
Doc Date
2/2/1984
Doc Name
Stip 3 response letter
From
TRAPPER MINING INC
To
MLRD
Permit Index Doc Type
STIPULATIONS
Media Type
D
Archive
No
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:;i}:e Savace <br />-2- January 14, 1961 <br />^he ulti-ate reason for deters±nina the overall overburden swell .`actor <br />is to prcject the volu.:.e o° bac!:filled spo_'1. f:nowing t~~s volume <br />relative to _arrc_'ning pit volume is necessary to assure proles con- <br />_'icuration of the " na1 backfilled surface. Su; face gradie^ts and Land <br />fOr.-S may f12VE t0 be adjusted ir, order to acco.~~-r~date increases or <br />decreases in spoil volu:-e. During this desicn exercise, care rust be <br />to%en to avoid tie creation c_` potentially structurally- or eros_'onally- <br />urstable land surfaces. A s;:ste~atic error in overburden. swel_' cro- <br />jection could result in accumulated errors oaring pit life. Under- <br />estimation of tie swell factor, in the worst case, could result in an <br />incor..p_'etelu bacl:filled _`iral cut. Over-estimation of tie swe-'1 factor <br />Could Iesult .n S~rplCS Da G':f_ll dnd ele:•ation of the recla_med surface, <br />particularly during _'a ter secments of the pit development. <br />~n defense of t~eir prcoosed technicue for overburden swe_'1 _`actor <br />determ_nation, Utah Internatio:al cites past pit performance as verifi- <br />cation of the+'r projected overburden swell factor. They t.`.eorize that, <br />'° trey had under-estimated the overburden swell _°actor, t'~eir o?erational <br />pit would systematicallu corstr'ct and t.^.ey e;ocid bECin er.?eriencina <br />dlfr:CL'i t0 ... expos i;g coal for extraction. Conversely, if the? over- <br />estimated the ovErburden s::el1 factor, the bac.;`_'lled surface would be <br />lo::er than projected. . <br />The Division recognizes that t_he determination of precise overburden <br />s~.e11 factors represents a difficult site-specific task. The pu-lose <br />for deterr.,ination of that sti:ell _`actor is to facilitate the best passible <br />design and piannine of bacrfi_'Ied and rec_'aimed post-airing surfaces, <br />in order to avoid the manifestation of potentially detrimental erosional <br />and slope instability phenomena. In light of the as yet unverified <br />nature of the applicant's proposed method of the overburden swell factor <br />determination, the Division considers it appropriate to require the <br />applicant to verify the actual post-tiring topograp.hu achieved at the <br />Trapper ISine. Furt4er, t.4e Division also considers it appropriate to <br />require the applicant to utilize prr~rine and post-rti ning topocraphic <br />survey data to calculate the actual overburden sc.•ell factor encountered <br />on an a^nual bas_'s. <br />/."t <br />cc: Fred Banta <br />David Shelton <br />Jerry Zimpfer <br />Dave Craig <br />
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