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Open-File Report 79-082 1979 COAL RESOURCE OCCURRE

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Open-File Report 79-082 1979 COAL RESOURCE OCCURRE UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY Text to accompany: Open-File Report 79-082 1979 COAL RESOURCE OCCURRENCE AND COAL DEVELOPMENT POTENTIAL MAPS OF THE COALWOOD QUADRANGLE, POWDER RIVER COUNTY, MONTANA [Report includes 17 plates] By Colorado School of Mines Research Institute This report has not been edited for conformity with U.S. Geological Survey editorial standards or stratigraphic nomenclature. CONTENTS Page Introduction - -------- -~-_ ____ ___ _____ __________________ Purpose---------- ------- ___--___--_ - _ - ____ __ _ i Location-------- -- - ---- ____________ __ _____ ___ - _ j Accessibility---- ----- --- _______________ ____ ______ } Physiography----- ---- --------- ______ __ ______ ___ 2 Climate 2 Land Status 3 General geology------- ---- - ___- ___ ___ _____________ _ 3 Previous work-- - -------- _____________ ____ _____ __ 3 Stratigraphy------------------------ ------ - - __---------_- 3 Structure----- --------------- - ________ ________ _________ 4 Coal geology---------------- ----------------------- ____________ _ 4 Contact coal bed- 5 Terret coal bed------------------------------- ------------ --- 6 Broadus coal bed ----------- ----- _____ _____ ______ _ 5 Knobloch coal bed-------------- --- ----- - _____________ 7 Sawyer coal bed- ------ _________ __ __ _____ ________ 7 Mackin-Walker coal bed -------------- - --- _____ -- --- g Local coal bed-------------- -- ------- _________ ____ _ 9 Coal resources--------- ---------------------------------- ________ 9 Coal development potential- ----------------- --- _______ ________ n Development potential for surface-mining methods-------- ------- 12 Development potential for underground mining and in-situ gasification--- ---- -------- --- -- _______ _ _____ 14 References------- ---- ------------- __________________ _____ _ ij ILLUSTRATIONS [Plates are in pocket] Plates 1-16. Coal resource occurrence maps: 1. Coal data map. 2. Boundary and coal data map. 3. Coal data sheet. Illustrations--continued 4. Isopach and structure contour map of the Mackin-Walker coal bed. 5. Overburden isopach and mining-ratio map of the Mackin-Walker coal bed. 6. Areal distribution and tonnage map of identi­ fied resources of the Mackin-Walker coal bed 7. Isopach and structure contour map of the Sawyer coal bed. 8. Overburden isopach and mining-ratio map of the Sawyer coal bed. 9. Areal distribution and tonnage map of identi­ fied resources of the Sawyer coal bed. 10. Isopach map of the Knobloch coal bed. 11. Structure contour map of the Knobloch coal bed. 12. Overburden isopach and mining-ratio map of the Knobloch coal bed. 13. Areal distribution and tonnage map of identi­ fied resources of the Knobloch coal bed. 14. Isopach and structure contour map of the Broadus coal bed. 15. Overburden isopach and mining-ratio map of the Broadus coal bed. 16. Areal distribution and tonnage map of identi­ fied resources of the Broadus coal bed. Plate 17. Coal development potential map for surface-mining methods. 11 TABLES Page Table 1. Surface-minable coal resource tonnage by development- potential category for Federal coal lands--------- 15 Table 2. Underground-minable coal resource tonnage by development- potential category for Federal coal lands-- - --.-. 16 Conversion table To convert Multiply by To obtain feet 0.3048 meters (m) miles 1.609 kilometers (km) acres 0.40469 hectares (ha) tons (short) 0.9072 metric tons (t) short tons/acre-ft 7.36 metric tons/hectare-meter (t/ha-m) Btu/lb 2.326 kilojoules/kilogram (kJ/kg) 111 INTRODUCTION Purpose This text is for use in conjunction with the Coal Resource Occurrence (CRO) and Coal Development Potential (CDP) maps of the Coalwood quadrangle, Powder River County, Montana, (17 plates; U.S. Geological Survey Open-File Report 79-082). This set of maps was compiled to support the land planning work of the Bureau of Land Management in response to the Federal Coal Leas­ ing Amendments Act of 1976, and to provide a systematic coal resource inven­ tory of Federal coal lands in Known Recoverable Coal Resource Areas (KRCRAs) in the western United States. Coal beds considered in the resource inventory are only those beds 5 feet (1.5 m) or more thick and under less than 3,000 feet (914 m) of overburden. Location The Coalwood 7 1/2-minute quadrangle is in north-central Powder River County, Montana, about 48 miles (77 km) south of Miles City, a town in the Yellowstone River valley of eastern Montana. Miles City is on U.S. Interstate Highway 94 and the main east-west routes of the Burlington Northern Railroad and the Chicago, Milwaukee, St. Paul, and Pacific Railroad. The quadrangle is about 15 miles northwest of Broadus, Montana, a small town on U.S. Highway 212 Accessibility The quadrangle is accessible from Miles City, Montana, by going south on U.S. Highway 312 a distance of 55 miles (88 km) to the north border of the quadrangle. This highway continues through the central part of the quadrangle and intersects U.S. Highway 212 about 12 miles (19 km) south of the quadrangle and 3 miles (4.8 km) northwest of Broadus. U.S. Highway 312 intersects a num­ ber of unimproved roads and trails which provide access throughout the quadrangle. The nearest railroads are the Burlington Northern Railroad and the Chicago, Milwaukee, St. Paul, and Pacific Railroad, both at Miles City. Physiography The Coalwood quadrangle is within the Missouri Plateau division of the Great Plains physiographic province. The upland plateau surface has been maturely dissected. The western border area of the quadrangle has been matur­ ely dissected by northwestward-flowing tributaries of Pumpkin Creek. The remainder of the quadrangle is drained by eastward- and southeastward-flowing tributaries of Mizpah Creek, a northeastward-flowing tributary of the Powder River. The eastern part of the quadrangle has moderate relief. The intermit­ tent streams here are in broad, grass- and brush-covered valleys between rela­ tively wide, rounded, interstream areas which rise about 100 feet (30.5 m) above the valley bottoms. The western part of the quadrangle is more rugged. The streams here head between narrow, pine-covered ridges that rise about 300 feet (91 m) above the valleys and are capped by reddish-colored clinker beds formed by the burning of coal beds. The highest elevations, about 3,680 feet (1,122 m) are on these clinker-covered ridges in the western part of the quad­ rangle. The lowest elevation, about 3,100 feet (945 m), is on Hay Creek at the eastern border of the quadrangle. Topographic relief is about 580 feet (177 m). Climate The climate of Powder River County is characterized by pronounced varia­ tions in seasonal precipitation and temperature. Annual precipitation in the region varies from less than 12 inches (30 cm) to 16 inches (41 cm). The heaviest precipitation is from April to August. The largest average monthly precipitation is during June. Temperatures in eastern Montana range from as low as -50°F (-46°C) to as high as 110°F (43°C). The highest temperatures occur in July and the lowest in January; the mean annual temperature is about 45°F (7°C) (Matson and Blumer, 1973, p. 6). Land status The Northern Powder River Basin Known Recoverable Coal Resource Area (KRCRA) covers about a third of the quadrangle, much of the southwest and northwest quarters, and some of the central part. The Boundary and Coal Data Map (pi. 2) shows the location of the KRCRA tracts and the land ownership status. There were no outstanding Federal coal leases or prospecting permits recorded as of 1977. GENERAL GEOLOGY Previous work Bryson (1952) mapped the Coalwood quadrangle as part of the Coalwood coal field, Powder River County, Montana. Matson and Blumer (1973) mapped part of the southwest quarter of the quadrangle as part of the Broadus coal deposit. Matson and Blumer's (1973, pi. 28) map of their Sand Creek deposit extends a slight distance into the northern part of the quadrangle. V. W. Carmichael (in Matson and Blumer, 1973) also mapped part of the quadrangle as part of the Pumpkin Creek coal deposit. Stratigraphy A generalized columnar section of the coal-bearing rocks is shown on the Coal Data Sheet (pi. 3) of the CRO maps. The exposed bedrock units belong to the two upper members of the Paleocene Fort Union Formation: the Tongue River Member and the underlying Lebo Shale Member. The light- to dark-gray and brown clays and carbonaceous clays of the Lebo Shale Member are exposed in limited areas near the bottoms of valleys along the east border of the quad­ rangle. The overlying light-colored sandstone, sandy shale, and coal beds of the Tongue River Member are at the surface throughout the rest of the quadrangle. One of the coal beds in the western and southern parts of the quad­ rangle has burned extensively at and near the surface and has baked and fused the overlying rock into reddish-colored slag or clinker. Approximately the upper 80 feet (24 m) of the Lebo Shale Member is exposed in the quadrangle, and about the lower 500 feet (152 m) of the Tongue River Member is exposed. The upper part of the Tongue River Member has been removed by erosion. Coal and other rocks comprising the Tongue River Member were deposited in a continental environment at elevations of perhaps a few tens of feet (a few meters) above sea level in a vast area of shifting flood plains, sloughs, swamps, and lakes that occupied the Northern Great Plains in Paleocene (early Tertiary) time. Representative samples of the sedimentary rocks overlying and interbedded with minable coal beds in the eastern and northern Powder River Basin have been analyzed for the trace element content by the U.S. Geological Survey and the results summarized by the U.S. Department of Agriculture and others (1974) and by Swanson (in Mapel and others, 1977, pt. A, p. 42-44). The rocks con­ tain no greater amounts of trace elements of environmental concern than do similar rock types found throughout other parts of the western United States. Structure The Coalwood quadrangle is in the northeastern part of the Powder River structural basin.
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