REP03471

• Permit No: C1981041
• IBM Index Class Name: Report
• Doc Date: 10/31/2001
• Doc Name: POWDERHORN COAL CO 2001 ANNUAL SUBSIDENCE REPORT PN C-81-041
• From: J E STOVER AND ASSOCIATES
• To: DMG
• Permit Index Doc Type: SUBSIDENCE REPORT
• Media Type: D
• Archive: No

C I
TABLE OF CONTENTS
Narrative
Page
Introduction .................................................... 1
Topography and Vegetation ........................................ 1
Geology ....................................................... 2
Mine Production and Design ....................................... 2
Projected Mining for 2002 ......................................... 2
Surfacelnspection ............................................... 2
Subsidence Surveys ............................................. 3
Table 1 Subsidence Monitoring Survey Data Comparison ................ 3
Minimizing Subsidence ........................................... 4
Conclusion ..................................................... 4
Subsidence Survey Results
May 22,2001 Survey ............................................. 5
September 24, 2001 Survey ....................................... 6
Photographic Field Review of Jerry Creek Canyon ......................... 7-14
Figure 1
Roadside North Portal - 2001 Annual Subsidence Survey