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This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. The Antaramut Coal Field is located in north-central Armenia approximately 15 km north of Vanadzor, the third largest city in Armenia (fig. 1). Coal has been reported in the Antaramut coal field since around the turn of the century. However, the coal had always been thought, by previous workers, to have occurred in an area of approximately 1 km2 (Talanian and Bogdanova, 1956; Keshabian and others, 1997). Because of the exploration work carried out by USGS, the coal field has been expanded from the 1 km2 area to an area of approximately 20 km2 (fig. 2). Because the coal field has been greatly expanded as a result of the exploratory drilling, we have renamed the coal field to include the three villages in the area the coal field encompasses. Thus, we have named this coal field the Antaramut-Kurtan-Dzoragukh coal field (fig. 2). 1 rotaried meters. Maximum depth drilled in this project was 264 m. This was not the capacity of the rig, but rather, the maximum depth of interest based upon geology and lithology of the region. In the beginning, we twin holed most locations. That is, the hole was rotary drilled and geophysically logged. Then, a second borehole, usually 4 to 5 m away from the first was rotary drilled to intervals of interest, usually coal, which were then cored. In the second year of the project, however, we encountered many technical engineering difficulties because of fractures in the strata above the coal, and as a result, we commonly cored the entire hole. Often, rotary drilling was neither safe nor efficient. Further, because of the complicated geology (tectonics, structure) of the coal field, the complete cores gave us more information than could be obtained by rotary drilling.

Borehole and thin section descriptions from exploration drilling and field work in the Antaramut-Kurtan-Dzoragukh Coal Field, North-Central Armenia