PERMFILE111769

• Permit No: M2004067
• IBM Index Class Name: Permit File
• Doc Date: 11/21/2005
• Doc Name: Exhibit 201-202
• From: City of Black Hawk
• To: DMG
• Media Type: D
• Archive: No

MEMORY 7RANSMlSSfOiYREPORT
r1
f~J
FILE NUMBER 384
DATE 23-SEP 15:22
TO : 53032748329
6000ND:NT PACES 003
START TIL¢ 23-SEP 15:22
END TINE 23-SEP 15:24
SENT PAGES OD3
STATUS OK
FILE NUNBER :384
I
PACE :001 1
TIt4: : 23-SEPi 2005 15:24
TEL NUNBfRI: [phone]
NAME :Colorado Division
of Minerals 8 GealaeY
*** SUCCESSFUL TX NOTICE ***
STATE OF COLORAL70
DIVISION OF MJNEaAtS ANO C.tO• ^~ _._ ~__ .. ~_ _ _
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03 -27 - = Fo„
3 eptemlbar 23. 2005
Tom Schrcfacr
Allen Soroncon ~~ i
8lasritg Plrtn Revfow of T7rlyd wdequacy Revtsty Rerpor+as. Clear C.aeR
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The D[vis;on of Minerals aSld C3eolpgy (DMG) enginnoring staff have reviewed the Applicant's blastipg
plans as eon[alned in the third adcqua¢y ceviow reoponso datod Scpcetnber 14, 2005. The blsatizag v[bration
control plan provtdcd will be prpicotive of ottsite trtructures, and the DMG can tecarnnamd approval of that
plan. @ is DMG•a amdcrasandixtg riser the Applicanx is pecparhig a list of betre mn:tagoment pxaeHeea (BMpa)
toe dust cosec] to be submitted for DM6 rev[sw artd approval. Tho BMps for dust control during biaoting
operations, fa addition to those already wrrtatitted to in September 14, 2005 adequacy reepoaso, must
include the following (a diagram wish nomcnclsnxre in orwlosed wit[a this memo):
1. Blattfllg with low density tacploeivea such as Ataaotonivm Nivate and Fuel O{3 (ANFO) will ba done with
a minimtun burdrn to charge diamc[cr rsUo of 25. Blasting wills higher dcnr3ty trzplosivas (density
greater than O_9S grams For cubic centimeter) must uao a in[nimaam ratio of 30. I£ahe t7pesutor
detenz'xcines that lower ratios are desirable. a wrjtteII propose] with jtra[[ Heatloa must bo submitted m
DMO. and written approval $pzn DMG must be obtniaod pr[oi to employm®t efthe lower ratios in
blastltag opeeaTinifa. DMG note that the blase patterns shows in flgurn 2 of the Appliaant's "R<aponse to
2"° Adequacy Review" dated August 19, 2005 arc in compiiancc with the required burden to charge
diameter ratios. ,
2. For initial blasging operations, dac collar disteaee (stenimiapJ will be equal to burden. Collar distance can
ba gradually redueed ton •~•=-•+mUtia o£70 percent of iris burden tf careRtl obacrvatixms of each blest
indicate that duet generation ie not inereesing with dmtcaaing e•- g. Dust obaervatiom moat bo
recorded in a2[ b[ast:ng reports where collar d[ntance [a lest than burden- If the Operaoor detern»nes that
collar diatrmces lass than 70 percent of bardea are desirable, a wrinep pmpoanl with. justiReaHpn rttum be
aubmiKed to DMO, and written approval 8ooa DMG moat be obtniaad prior ro employment of the lower
collar distances ire bleating operar[ous. Once an acceptable miniitaum collar distattcc In approved by
DMG, dust obeervetion recording in blastivg t¢potV may ba dlaeonNnued. Aa dieeucaed in DMG•c
Sep[rnaber 9, 2005 engineering memo. mad as a®r¢ed to in the Applicant's September 24, 2005
•'Responso to 3'° Adequacy Review" ]otter, bleating mats or application of thick dirt cover easy be vend is
lieu of the required m[nixrnun atetitming. DMQ notes that the bleat partes-na shpwta in ftgtue 2 oFtho
wpplioans•a ••Reapor.ae xo 2"n Adequacy Review'• dated August 1 D, 2005 do tvc ap<ci[y. rvinimurn
Btu m1n$ fagarrCnienta.
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