REV04371 - Laserfiche WebLink

Home Browse Search

~ ~ III IIIIIIIIIIIIIIII TRAPPER 1RINING IpC. February 5, 1942 HAND DELIVERED Mr. Kent Gorham Colorado Mined Land Reclamation Division 215 Centennial Bldg. ~_'. '- 1313 Sherman St. Denver, co 8ozo3 : Eg 0 6199? Dear Kenn Rijn^- I_Sfld ~^ RE: Technical Revision 59. Blasting Distance Mod cations in the Browning and Colt Pit Mining Areas at Trapper Mine. Trapper Mining Inc. proposes to modify our current blasting distance requvemen[ to allow blasting within 300 feet of a powerline and within 740 feet of one permanent building and one semi-permanent building (no foundation) in our Browning and Colt pit mining areas. Trapper submits the following proposal to ensure we are in compliance with Rule 4.08, Use of Explosives, as required by the Regulations of the Colorado Mined Land Reclamation Board for Coal Mining. Powerline Although not specifically stated within the state regulations (4.08.4(7)(b), Trapper assumed that the distance requirement for blasting adjacent to a powerline is 500 feet The powerline in question is owned and oper- ated by the Yampa Valley Electric Association and is located along Trapper's western permit boundary adjoining the Cyprus Empire coal mine. Power is distributed to a variety of outlets including nonessential Trapper and Cyprus Empire facilities, the Lux residence, the Simince residence and two other residences in the Big Bottom area. Trapper in conjunction with the Yampa Valey Electric Association will monitor and control impacts to the power transmission line by closely controlling the weight of the explosives to be deto- nated. Trapper will visually monitor blasts (powerline) as we approach the transmission line to prevent pos- sible damages. Following each blast, Trapper will inspect power poles and lines to ensure the integrity of the line. If any problems arise, Trapper will discontinue blasting until a suitable alternative can be worked out between Trapper, YVEA and CMLRD. Please fmd enclosed a written waiver by Yampa Valley Elecvic Association granting Trapper Mining Inc. permission to blas[ within 300 feet of their power transmission line. Buildings As discussed and inspected during your last visit to Trapper (1/8/42), there currently exists two buildings, the permanent structure being within 740 feet of Trapper's proposed Colt pit blast area. The structures are located within the Cyprus Empire permit boundary. The buildings sere as storage and training facilities. Thetr intent is not to serve as permanent dwellings. Please fmd enclosed a typical blast design for the Browning and Colt pit mining area (Figure 1). It is esti- mated that four overburden (Figure 2) and two parting blasts will be performed in the Colt pit, and two overburden blasts (Figure 3) in Browning pit. P.O. Box 187 Craig, Colorado 81626 (303) 824-4401