Laserfiche WebLink
1/10/22, 10:32 AM State.co.us Executive Branch Mail-Re: HC#67752 Colowyo Mine Permit Technical Revision 152 <br /> STATE OF DRMS—CoalAdmin -DNR, DNR<dnr—drms—coal—admin@state.co.us> <br /> COLORADO — <br /> Re: HC# 67752 Colowyo Mine Permit Technical Revision 152 <br /> 1 message <br /> Trujillo - DNR, Zach <zach.trujillo@state.co.us> Mon, Jan 10, 2022 at 9:22 AM <br /> To: "Marques- HC, Matthew" <matthew.marques@state.co.us> <br /> Cc: DNR DRMS_CoalAdmin - DNR<dnr_drms_coal_admin@state.co.us> <br /> Dear Mr. Marques, <br /> Please see the following image showing the location of the proposed additional highwall mining area from the proposed <br /> Map 23 compared to the currently approved Map 23 (TR-147). The highwall mining region is outlined yellow and red <br /> arrows are shown to help find the proposed additional highwall mining area. The majority of the proposed <br /> additional highwall mining area is within previously disturbed areas associated with the South Taylor Pit. <br /> f WEST TAY�QR FJ2 t � <br /> - (PEPMANEW fi1lGk2f04Y1A3i pVE 7 1'{.','L R rkt <br /> N(HWdl rw= <br /> --=.v <br /> rPEPJ� -N 3 f n HC4V4t�lNwG <br /> EST +T <br /> r•orr !'' 2 7.2077 <br /> x 7;Hrciat�rrr sfr nr 7� rT f r r°; 1 7 'l <br /> -2002 , r rrrw�r ai�I�ulv(� €f�oo2rr <br /> axe �99 <br /> EAST Tea LOR FIL t/ f+f+f ` y EASr Try OR Ptt <br /> - (PER,ANENT) {.r+r I � 4 r � �•' �"'* '_� (PER+4NEl171 g <br /> f <br /> S�ITh TAYt014 <br /> HtGFiW4ZL+UiJ!l�Cr <br /> 2022-2o2e 2013-2022 HIGHWALt lrIV�N <br /> / "I I , �f <br /> fr k. sfTrouv?sT207-2010 <br /> 3. s <br /> S U2/H TAY7O ' � � TR TAYLOR f� 1 <br /> HIGHWALt 441NHVG 1- z20043 <br /> 21 % <br /> 29 7F1�xN4Y�Lt�J4ilh�lJG . <br /> *{ 2016 lf <br /> ' •1 HI'bH mojvN f ram._ i J' <br /> I i' f 207 74 1 ti 507. 4 <br /> yam~ •S K _ f-r'_ f <br /> Propose TR-1 52 <br /> JApproy&d TR-147 <br /> It should be noted that the majority of highwall mining for the Colowyo Mine adjacent to southern and western limits of the <br /> South Taylor Pit have already been approved with TR-147 as shown above in the image. Attached is the correspondence <br /> from SHPO to the Division regarding TR-147 and highwall mining operations for the noted portion of the South Taylor Pit. <br /> Colowyo Mine's approved highwall mining plan for the South Taylor Pit is zero-subsidence plan which incorporates <br /> pillaring between entries. No subsidence is expected from highwall mining operations at the South Taylor Pit or has <br /> occurred as a result of previous highwall mining. I have also included Colowyo Mine's approved highwall mining <br /> engineering report and analysis for the South Taylor Pit. This report and analysis is based on standard highwall <br /> engineering practices as well as site specific evaluation from the extensive highwall mining operations that have occurred <br /> historically at the Colowyo Mine (orange outlines within the image above). Due to file size constraints of Gmail, the <br /> following Google Drive link includes the above stated approved highwall mining engineering reports. <br /> https://drive.google.com/drive/folders/1 0-ikV3-84TnTac8FVOkP_RgfV25nO8Bf?usp=sharing <br /> For highwall mining, operations occur from within the pit area outside of the mined subsurface regions. All <br /> personnel operate from the outside and do not enter the subsurface area. As a result, no ventilation, associated surface <br /> borehole drilling, and support roads are necessary. Additionally, per Rule 4.23.2(4)(a)of the Regulations of the Colorado <br /> Mined Land Board for Coal Mining require all entry holes from highwall mining to be backfilled and compacted within 72 <br /> hours of completion. <br /> If you have any additional questions, feel free to contact me. <br /> Sincerely, <br /> On Thu, Jan 6, 2022 at 9:02 AM Marques- HC, Matthew<matthew.marques@state.co.us>wrote: <br /> Hi Zach, <br /> https://mail.google.com/mail/b/ALGkd0y8elLUpphO-cw_b4dRu9Vtn4AuagQgJnHQChhDjud92irb/u/O/?ik=deb7fOcd20&view=pt&search=all&permthid=t... 1/3 <br />