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Twentymile Coal, LLC (TC) Geologic and Engineering Data Report Lease by Modification Application — Wolf Creek Reserve April 2014 GEOLOGIC AND GEOGRAPHIC SECTION A. Legal description of the area Legal location A portion of the proposed lease modification application area was previously evaluated and leased to TC for development and mining of the Wadge Coal Seam. TC is a subsidiary- of Peabody Energy. The original leasing evaluation and Environmental Assessment (EA CO -016-95-020) were completed in 1995, and the original lease (COC -54608) was issued to Cyprus Western Coal Company in February 1996. The Wadge Seam coal lease includes approximately 2,600 acres in TSN, R86W, Sections 21, 22, 23, 26, 27, 28, and 33. The proposed lease modification tract boundary includes portions of the previously leased area in Sections 21 and 22, and adds approximately 100 acres in the SW'/4 of Section 21. The legal description for the proposed lease modification area adds all federal reserves - COC -54608 (720 acres) and COC -81330 (40 acres) - lying in the Wolf Creek Seam in the following areas. Township Range Section 5N 86W Section 21; N''/z, N'/2SE'/4, N'hSW'/4SE'/4, NE'/4 SW'/4, N'/z SE'/4SW'/4, NW'/4SW'/4 5N 86W Section 22; NW'/4, N'/2SW'/4 This tract contains 760 acres, more or less, in Routt County, Colorado. The majority of the surface overlying the Land is owned by Twentymile Coal, LLC. A portion of the surface on the eastern edge of the lease modification area is owned by Ashley Investments. Map showing general affected area The general location of the tract is shown on Exhibit A and Plate 2, Map 23. The proposed lease modification tract is located approximately 18 miles southwest of Steamboat Springs, Colorado and eleven miles northwest of the town of Oak Creek, Colorado. B. Geologic characteristics Generalized lithology of the area is shown in the legend of Plate 6 and on Figure 1. Overburden/Interburden Total overburden thickness ranges from 1,200 feet to 1,900 feet above the top of the Wolf Creek Seam in the lease modification area. Refer to Plate 6 — Overburden drawing. 2. Interburden Approximately 100 feet to 170 feet of interburden separates the Wolf Creek Seam from the overlying Wadge Seam in the lease modification area. C. Coal quality High heating values and volatile content place the Wolf Creek Seam in a high volatile, group C, bituminous coal classification. The coal seam splits into four distinct benches toward the east with benches WF1 and WF2 (as numbered from bottom to top) combining. When coal bench WF4, splits from WF3, the parting consists of sandstone with shale. When coal bench WF3 splits from WF2, the parting consists primarily of sandstone. Coal benches WF2 and WF1 have a small dull coal band that separates the benches and ranges from 0 to 1.5 feet in thickness. WCR BLM Lease App Geologic & Engineeering Data Report 0414.docx Page 1