2010-05-07_PERMIT FILE - C2009087 ‎(51)‎

• Permit No: C2009087
• IBM Index Class Name: Permit File
• Doc Date: 5/7/2010
• Doc Name: Initial Subsidence Evaluation, Continuous Miner Development
• Section_Exhibit Name: Exhibit 2.05.6-E1 Initial Subsidence Evaluation, Continous Miner Development
• Media Type: D
• Archive: No

Civil & Mining Engineering
Engineering Geology
Tunnel Engineering & Construction Management
Sub Terra, Inc. Rapid Excavation /Support Systems
Active/Abandoned Mine Subsidence
Quality Assurance / Quality Control
Safety Monitoring of Structures
Blast Optimization / Vibration Monitoring
Mine & Quarry Permitting
Material Science / Laboratory Testing
Wednesday, November 18, 2009
Mr. Mike Ludlow
Peabody Energy Corporation
Sent via e-mail to MLudlow @peabodyenergy.com
Re: Initial Subsidence Evaluation for Continuous Miner Development at the Sage Creek Mine.
Dear Mr. Ludlow:
This letter report has been written to address Preliminary Adequacy Review Comment (PARC) No.
47 by the Division of Reclamation, Mining and Safety, Department of Natural Resources
transmitted to Peabody Energy Corporation on September 11, 2009.
Introduction
PARC No. 47 requires potential subsidence impacts from the Room and Pillar development at the
Sage Creek Mine to be evaluated according to Rule 2.05.6(6) — see Attachment A for full citation.
• SubTerra, Inc.'s Scope of Work was to evaluate the potential for subsidence from continuous miner
development of the headgate and tailgate entries (i.e., longwall development) taking into
consideration:
1. Potential for mine roof failure.
2. Potential for pillar failure.
3. Potential for pillar punching or mine floor heave.
4. Potential effects, on subsidence, of encountering unexpected faults.
5. Potential effects, on subsidence, of encountering inflows of gas or water.
The following paragraphs address these phenomena with regard to the requirements of Rule
2.05.6(6).
The enclosed and attached work products were prepared for Peabody Energy as input to their
preliminary planning and permitting for development of the Sage Creek Mine project and for no
other purpose. The work was performed under SubTerra, Inc.'s General Terms and Conditions
and in a manner consistent with the level of care and skill ordinarily exercised by other professional
contractors in similar circumstances at the time the Services were performed. No other warranty,
express or implied is made.
Location and Layout of the Proposed Development Work
Figures 1 and 2 show the location and layout of the proposed Sage Creek mine workings,
overburden contours and surface structures. Structures and Renewable Resource Lands include:
1. Grassy Creek, a perennial drainage.
2. Little Grassy Creek, an intermittent drainage.
• 3. County Road 27.
Post Office Box 520, 218 East North Bend Way, North Bend, WA 98045 -0520
Phone [phone] Web Site: www.subterra.us Email: info @subterra.us Fax [phone]