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~_ ..-- ° VIIDID~IV~Id~~~O~l~ ° ~I~~Il~'OIl~1~C~t~~g ~~C~a L~R~v E. o'eRiAa PpH01D6pY May 14, 1985 Mr. Peter V. O'Connor Mined Land Reclamation Division 1313 Sherman St., Room 423 Denver, Colorado 80203 Dear Mr. O'Connor: Re: Blasting information letter response for Albert R. Frei, Walstrum Mine, Clear Creek County - MLR Permit 883-33 9909 t"1~3T 00Tp9 ANEPoUE ARNQDA COLORADO 00004 Sb8-4S8-Y29Y iVt ~-1,1' J_ 1' 1~i5 -.. ... .. , ~ r..~ ~ , .. .. .. .. urt .~`,G: ~• J.li~.l~~.l"ll~_.l. Ml On behalf of our client Albert R. Frei we are submitting the following answers to your May 8, 1985 letter concerning blasting procedures at the Walstrum mine. Since the blasting in the mine comes under the Bureau of Mines, MSHA and OSHA we assume you are asking these question for curiosity reasons. If not please show where you have authority to regulate this part of the mining operation. We there for submit the following informative answers as a courtesy to the staff. 1. Mr. Frei stated they would blast Between the Hours of 9:00 A. M. and 2:00 P. M. one day a week. The day blasting will occur will depend on the rate of production in the mine. As production increases it may be necessary to shoot more than once a week but the hours will remain the same. 2. Yenter and Sons Blasting, inc, are the blasting contractor for this operation. They use procedures standard to the industry and approved by the Bureau of mines. They incorporate the use of delays with non electrical caps for their designed shots. 3. ANFO is the primary blasting agent with 60 gel dynamite used when in the opinion of the blasting contractor it is warranted. 4. Please refer to the vicinity map submitted with the original application. 5. Since Yenter and Sons have taken over the blasting the fly rock distance has been confined to the face area of the mine. In the future any fly rock distances will be contained within the mine area. 6. Yenter uses the 60 scaled distance equation. If you do not have this information in your reference material we gill try to get a copy of it from Yenter.