Lignites of North America (Coal Science and Technology) by Harold H. Schobert

By Harold H. Schobert

Offering a complete survey of the beginning, the basic homes and the know-how of usage of the lignites of North the United States, this article can be of curiosity to specialist scientists and engineers operating within the box of coal examine or coal know-how. As coals exhibit a continuum of houses, frequently without sharp, steep swap among ranks, the publication restricts the dialogue strictly to lignites (with the occasional comparisons with different coals).

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Pulaski County has the largest reserves, with approximately 40% of the estimated total. Other counties containing large deposits, expressed as a percentage of the total state reserves, are Saline, 20%; Ouachita, 16%; and Dallas, 15%. The most extensive lignite area in Arkansas is about 155 km2, northwest of Camden in Ouachita County [44]. The lignite is exposed along the banks of the Ouachita River and its tributaries. 8 m [44]. The deposit contains about 68 Mt [44]. 5 m thick, occurs near Manning in Dallas County [44].

3 m thick are present near the top of the Oak Hill [33]. The Tertiary lignites run in a west-to-east band across the southern part of the state. The thickest and most persistent bed is the Oak Hill lignite. The Oak Hill Member of the Naheola Formation contains a remarkable lignite seam that can be traced for 120 km from the MississippiAlabama border in a southeastern direction to Wilcox County [18]. 3 to 4 m [18]. The inferred resources in Wilcox County are 188 Mt, underlying an area of 175 km2 [36].

Bedrock aquifers consist mainly of consolidated sandstones and limestones with some interbedding of shales, siltstones, or claystones. However, some of the sands and clays are associated with lignites. Both the Fort Union and Hell Creek Formations contain major lignite beds that are aquifers. 2 Montana (i) Occurrence. About 200 Gt of mineable coal are available in Montana, and, of this, about three-fourths is lignite or subbituminous in rank. The lignite reserves of Montana are estimated to be 79 Gt [80,81], generally found in the northeastern part of the state.

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