Laserfiche WebLink
Characteristics of Coal and Overburden <br />Northfield has utilized geologic data from various sources obtained <br />between 1976 and 2005 to evaluate physical and chemical <br />characteristics of coal and non-coal strata within the Northfield permit <br />area. The rnajority of this data is the result of exploration and drilling, <br />geophysical logging and laboratory analyses of coal. <br />The Ocean Wave Coal Seam <br />The NorthfiEld project proposes developing the Ocean Wave reserve <br />that lies below the Royal Gorge coal seam and above the Canon City <br />coal seam. The seam is low to moderate sulfur content and low to <br />moderate a;sh. The coal ranges in thickness. from 4 to 6.5 feet. The <br />Ocean Wave seam displays a thin over rider ranging from 0.5 to 1.5 <br />feet in some areas. Substantial exploration of the area has occurred <br />over the years by property owners and prospective coal developers. <br />The following lithologic description of the immediate roof and floor is <br />data from exploration that occurred in 2005 and 2007. Additional data <br />is available upon request. <br />• <br />• <br />Drill Hole Upper Roof Target Floor <br />ID Ftider ascendin strata Seam descendin strata <br />NF-01 1.5 ft. 4.3 ft. sandstone/ 4.3 ft. coal 1.2 ft. sandstone/ <br />South shaley siltstone siltstone <br /> coal 1.5 ft. shaley coal 8 ft. interbedded <br /> 3.0 ft. siltstone sandstone <br /> 4.0 ft. sandstone/ <br /> siltstone <br />NF-02 G.5 ft. 6.0 ft. interbedded 4.8 fit. coal 10.3 ft. mudstone <br />East coal sandstone <br /> 2.0 ft. sandstone <br /> 0.5 ft. coal <br />NF-03 7.5 ft. siltstone/ 5.2 ft. coal 1.5 ft. siltstone <br />North interbedded 15.5 ft. sandstone <br /> sandstone <br /> 4.0 ft. sandstone/ <br /> interbedded siltstone <br /> and mudstone <br />The in-place coal reserve in the Ocean Wave is divided into two <br />reserve blocks, North and South, that are separated by an in seam <br />split that may exceed 4 feet in thickness. This split corridor trends <br />roughly southwest to northeast and averages 3000 feet in width. The <br />North Reserve Block is bounded by thinning coal to the north and the <br />seam split i:o the west, south and east. The South Reserve Block is a <br />2.04-12 Revised 8/20/07 <br />