The Dye-3 deep ice core (10.2 cm diameter; 2037 m long) was drilled from 1979-1981 as an international venture called the Greenland Ice Sheet Program (GISP), involving groups from Denmark, Switzerland, and the United States. The drilling was conducted with the new Danish ISTUK electromechanical drill. The drilling fluid was kerosene (Jet A1) and perchloroethylene (PCE). Drilling reached 225 m in 1979, 901 m in 1980, and the bed at 2037 m in 1981. Silty ice was found at a depth of 2013 m. Discontinuous sections are archived at the NSF-ICF, and other sections are archived in Copenhagen.
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