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Evaluation of coal resources in the eastern part of the Fort Peck Indian Reservation, Montana
| Content Provider | Semantic Scholar |
|---|---|
| Author | Biewick, Laura R. H. Hardie, John K. Amdt, H. H. |
| Copyright Year | 1990 |
| Abstract | The Fort Peck Indian Reservation occupies about 3,000 square miles in the western part of the Williston Basin, Montana. The area discussed herein lies in the easternmost part of the reservation and contains about 1,000 square miles underlain by the coal-bearing Paleocene Fort Union Formation. Within this study area, the Fort Union Formation contains 15 potentially recoverable coal beds as thick as 13 feet. The coal beds were deposited in two different depositional settings. Coal beds in the lower part of the interval were probably deposited in an upper-delta-plain environment. Coal beds in the upper part of the interval are believed to have been deposited in backswamps on an alluvial plain. The coal-bearing sequence on the Fort Peck Indian Reservation is buried under surficial deposits of late Tertiary and Quaternary age which severely limit bedrock exposures. Most of the data in this report are from shallow drill holes and seismic shotholes that did not penetrate beyond the areas shown to be underlain by the lower coal beds. The apparent rank of all coal beds sampled was calculated as lignite A. The resource information presented in this report was generated using data in the National Coal Resources Data System. Coal resource estimates of 15 potentially recoverable coal beds in the Fort Union Formation were calculated using GARNET (Graphic Analysis of Resources using Numerical Evaluation Techniques) software. Total identified coal resources of the Fort Union Formation in the study area of beds 2.5 feet or greater in thickness and at depths less than 1,000 feet are estimated to be 8.5 billion short tons. |
| File Format | PDF HTM / HTML |
| DOI | 10.3133/b1869 |
| Alternate Webpage(s) | https://pubs.usgs.gov/bul/1869/report.pdf |
| Alternate Webpage(s) | https://doi.org/10.3133/b1869 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
