Research about Little Susitna district

USGS1954

Subsurface exploration in the Little Susitna district, Matanuska coal field, Alaska

Preliminary geologic mapping of the Little Susitna district in 1952 showed that an area of at least 140 square miles is underlain by coal-bearing rocks of Tertiary age, and indicated that coal beds of minable quality and thickness might be present at several localities. Detailed exploration with a bulldozer and power auger was done at these localities in 1953 and 1954 with special attention to strip-mining possibilities. All the beds examined at the four localities tested were judged to be either too thin or too dirty to be minable under present conditions, and none of them are favorably situated for strip mining.

Alaska↗

USGS1953

Preliminary report on the Little Susitna district, Matanuska coal field, Alaska

The Little Susitna district, as defined in this report, occupies an area roughly 25 miles long and 3 miles wide on the north side of the lower (western) extremity of the Matanuska Valley in south-central Alaska (fig. 1). The district is bounded on the north by the Talkeetna Mountains, on the south and east by the Little Susitna River, and on the west by the broad lowland of the Susitna River. (See pl. 1.) This report is based on field work done in the summer of 1952, in which the writer was assisted by Alfred Oestreich, Lewis Ladwig, and Richard Pack. Prior to the present investigation very little was known geologically of the district, except that it was largely covered with alluvial and glacial deposits and that coal-bearing rocks were exposed at three widely separated localities. The purpose of the investigation was to determine, if possible from scattered outcrops and shallow test pits, whether any parts of the district offered sufficient promise of containing minable coal deposits to warrant a more detailed investigation using sub-surface methods. As a result of this preliminary investigation, plans are being made to explore more thoroughly, by trenching and drilling, some of the more promising parts of the district.

Alaska↗