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( ) <br />EXPLORATORY DRILLING IN THE McCALLUM COAL FIELD, JACKSON COUNTY, <br />COLORADO, AUGUST-NOVEMBER 1977 <br />By Dawn Hill Madden <br />INTRODUCTION <br />Jim Feighny and Son, Loveland, Colorado, rotary drilled 40 holes and <br />cored the coal in 7 holes in the McCallum coal field, Jackson County, north- <br />central Colorado (figs. 1-12, table 1). The drilling was done under Contract <br />No. 14-08-0001-15798, awarded by the U.S. Geological Survey. Geophysical <br />logging of the holes was done by Minerals Service Company, Grand Junction, <br />Colorado. Savage Scientific, Craig, Colorado, logged one core hole (E-23). <br />The purpose of the drilling was to obtain information about the depth, thick- <br />ness, extent, and quality of the coal in the Coalmont Formation ae part of <br />the Survey's program to evaluate and classify federally owned coal resources. <br />Most of the holes are located within areas nominated for coal leasing by <br />industry. <br />U.S. Geological Survey personnel provided general supervision of the <br />drilling, which included selecting the drill sites, determining depths to be <br />drilled, and obtaining permission for access from the County and from private <br />surface owners. Survey personnel also described the rocks in the cuttings <br />at each site and compiled and analyzed the drill-hole data. One of the drill <br />holes (G-16) was completed as an observation well. This well will be used <br />to monitor water level and quality over a period of at least 3 years. Water <br />level will be measured quarterly with a steel tape, and samples will be <br />pumped yearly to be tested for major cations and anions and selected trace <br />metals. Data obtained will be used to define the ground-water system and <br />to aid in studies of the hydrologic impact of coal development. These data <br />will be made available upon request from the U.S. Geological Survey, Water <br />Resources Division, Colorado District Office, Lakewood, Colorado. <br />1 <br />