PERMFILE47750 - Laserfiche WebLink

Home Browse Search

• GEOLOGY OF PIT 1 - FEDERAL COAL LEASE NO C-27931 Stratigraphy, Structures and Coal Geology During December, 1979, Wyoming Fuel Company drilled three holes on federal land immediately south of the original Canadian Strip Mine. The holes were drilled under Temporary Use Permit No. CO-010-TU-80-B prior to the issuance of Federal Coal Lease No. C-27931. Two of the holes are within the present permit boundary and one hole lies immediately southwest. These holes were drilled for the purpose of installing water monitoring stations necessary for observing the effect of subsequent mining operations on water quality and quantity. The United States Geological Survey also drilled two holes, both o£ which lie outside the present permit area to the west. These holes were drilled for the purpose of evaluating the coal resource south of the original Canadian Strip Mine pit. • Upon issuance of Federal Coal Lease C-27931 (March 20, 1980), Wyoming Fuel Company conducted additional exploration drilling which resulted in the discovery that significantly less coal was recoverable on the lease than was previously indicated. Table 1 lists the drill hole data for all holes falling within Federal Coal Lease No. C-27431. Lithologic descriptions from holes that are utilized in compil- ing cross sections through the permit area are found at the end of this Appendix. Electric logs for these same holes are also included. Three cross sections were drawn through the permit area (see Exhibit C-3). Section A-A' is along strike and Sections B-B' and C-C' are along dip. The cross sections demonstrate the relative discontinuity of the Sudduth Coal in the Pit 1 area. Numerous and highly interbedded lithologies can be designated in the permit area above the Sudduth Coal. These lithologies are outlined on Exhibit C-3, along with the cross sections. The locations of the cross sections can be found on Exhibit C-2. -7-