Rotary Drilling for Strippable Coal in the Jarvis Creek Coalfield, Alaska.
NTIS: PB/214-938 Available for Reference At Central Library Us Dept of Interior Wash DC :32 pages
Twelve relatively short holes were drilled using a csr (center sample return) drilling system to test the applicability of the drilling system and to test coal continuity in the vicinity of the present mine workings of the Jarvis Creek coalfield. Coal intersections plus geologic evidence indicate depositional continuity over fairly large distances. The csr drilling system offers an excellent method for determining coal continuity and a system in which a fair (but not quite as good as core) sample may be obtained.
NTIS Accession No.
NTIS: PB/214-938; Available for Reference At Central Library, Us Dept. of Interior, Wash., DC