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Chemical and geologic data are presented for 383 lignite and 22 rock samples collected from the Fort Union Region in North Dakota and Montana. Chemical data include sample locations, sampling methods, stratigraphic information, air-drying loss, proximate and ultimate analyses, heat content, forms of sulfur, ash deformation temperatures, free-swelling index, and major-, minor-, and trace-element concentrations. Within the region, moisture contents range from 20 to 57 and average 38.8 per cent. Mean ash yield is about 9 per cent but ranges from 4 to 31 per cent. Heat content averages 6290 Btu/lb (3497 Kcal/kg) over the region. Concentrations of trace elements of environmental concern are generally low. Average concentrations of arsenic and uranium are less than 6 ppm. Mean values of selenium and cadium are less than 1 ppm. Sodium and barium are two elements that can occur in high concentrations (mean values of 2200 and 389 ppm, respectively) in these lignites. INTRODUCTION Regional Setting The Fort Union Region is in the Northern Great Plains Coal Province and covers parts of four States and three Canadian Provinces. Coals in this region are lignite in rank and Paleocene in age. Comparative stratigraphy and nomenclature within the region are indicated in figure 1. In North Dakota, the Fort Union Formation is classified as a group by the North Dakota Geological Survey. Eastern Montana Western N. Dakota Central N. Dakota Tertiary Paleocene /VWVVVW Tongue River Fort | Hbr Union Fm Lebo Hbr Tullock Mbr Fort Union Gp Sentinel Butte Fm Bullion Creek Fm Slope Fm / Cannonball Ludlow Fm \ Fm | Sentinel Butte I Fm I j Bullion Creek I Fm | Cannonba 1 1 Fm Figure 1. Comparative stratigraphy and nomenclature for the Fort Union Region (after Daly and others, 1985). National Coal Resources Data System The National Coal Resources Data System contains information on the stratigraphic occurrence and the chemical and physical characteristics of coals. The USCHEM database includes proximate and ultimate analyses, major-, minor-, and trace-element concentrations, forms-of-sulfur analyses, ash fusion temperatures, heat content, air-drying loss, and free swelling indices. Analyses of 383 lignite samples and 22 rock samples from North Dakota and Montana compose the available USCHEM database for the Fort Union Region. Collecting localities for these samples are shown in Figure 2.

Analyses of lignites and associated rocks from the Fort Union region, North Dakota and Montana