Laserfiche WebLink
Peabodw <br />Twentymile Coal Company <br />November 1.1, 2009` <br />Mr. Allyn C. Davis <br />District Manager <br />MSHA, Coal District 9 <br />Denver Federal Center <br />6`"-arid' Kipling <br />?`? Street,"Building #25, 9-16 <br />Denver,.Colorado 80225 <br />7 9os- B7-i93,5- <br />Pawn <br />II NOY137W9 <br />=I?Cf?tr{rik- Q;tt <br />?f?fit?+iWiti ? <br />29515 Adutf Cqunty Road w <br />Oak Creek, Cotorado 80457 <br />976,879.3800- <br />RE. Foidel Creek Mine <br />ID ## 05-03836 <br />Roof Control Addendum - Revised Page 1 and Page 3 - Barrier Pillar- West Mining District <br />Dean Mi. Davis: <br />Subn fitted for your re?'iew and approval is a Roof Control Plan Addendum in response to your letter <br />of June 3, 2009 .concerning the. barrier pillar between the West Mining District and the flooded <br />workings ofthe Southwestern MiningDistrict. This revision to Page 3 adds item number 10 stating <br />that the minimum barrier pillar between the West Mine District development entries and the South <br />West Mine District will be a minimum of 190 feet. <br />Incl'ud'ed with this submittal i. A report prepared by Mtirali Ggdde et al titled "Effect of Water Head <br />on,BarrierPillar. Stability at Foidel Creek Mine"'. This study was conducted using'the minimum <br />projected barrier pillar dimension projected between the two districts: As is shown in the ttport, with <br />the barrier pillar, coal strength conservatively discounted by 20% for water pressure induced seepage <br />into. the coal,. the stability factor on the barrier pillar is 1.37. This stress analysis shows the barrier <br />pillar be adequate pratection for the development entries of the West Mine District. <br />Page i s.,also submitted for approval Thos page is submitted to change the name of the company <br />official responsible for the roof control plan. <br />If ,you have any questions concerning th- matter, please call' me at (070) 0027A Thank <br />you fox yot tr cooperation to this matter. <br />Sincerely; <br />Robert T. Johnson <br />Technical Safety Coordinator <br />Cc Walter Scleller Mike Ludlow <br />Jeremy Jones Pat Sollars <br />Allen Meckley 1311. Bennett. <br />Chris Thielen Dianna Ponikvar <br />Chris Van Arsdale <br />2009,}Y-llfiacerLelter•ReibrCun'trot:-Pab%es 1 & Mae <br />E. Jason Davis <br />Mike Berdine <br />Jim Fo quer <br />Mike Dezeeuw <br />Dick Conkle <br />Dennis Bon:wens <br />Craig Madsen <br />Will Dennis <br />APPROVED <br />DEC - 9 2009 <br />CfvlSF1