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The High Bridge Group (Middle Ordovician) of northeastern Kentucky is a major source of limestone and dolomite for construction, agricultural, and industrial stone. These industries require carbonate rocks of high chemical purity. Chemical analyses of foot-by-foot samples from a Mason County core show that three zones of high-calcium and several thick zones of high-carbonate and low-silica stone are present in the High Bridge at a mineable depth. Mason County is located in northeastern Kentucky, on the Ohio River, and offers river access to transportation to the metropolitan Covington-Cincinnati market and the northern portion of the Eastern Kentucky Coal Field for mine-related markets. INTRODUCTION The Kentucky Geological Survey is conducting a regional study of the High Bridge Group (Upper Ordovician) to determine its chemical characteristics and to outline the occurrence of deposits suitable for industrial uses requiring carbonate rocks of high chemical purity. This is the third publication in a series of reports on the chemical characteristics of High Bridge carbonate rocks; analyses of foot-by-foot samples from Boone and Fayette County cores were previously published (Dever, 1974, 1981). This report presents the chemical analyses of footby-foot samples of the High Bridge section from a core taken in Mason County. The core contains three zones of high-calcium and several thick zones of high-carbonate and low-silica stone. The High Bridge Group (Middle Ordovician) is a thick (430 to 570 feet), widespread body of limestone and dolomite that is at a mineable depth beneath a large area of central and north-central Kentucky. It is being mined for construction and agricultural stone, for the production of lime for flux, and for flue-gas desulfurization (FGD). Lime is also used for rock dust, to neutralize acid mine drainage from coal mines, and in chemical industries. The High Bridge Group is being mined at two sites along the Ohio River in north-central Kentucky by the Dravo Lime Company: the Cabin Creek Mine at Springdale near Maysville in Mason County and the Black River Mine at Camtown in Pendleton County. The Mason County core was given to the Kentucky Geological Survey by Cominco American, Inc. It is on file and available for inspection at the Survey's Well Sample and Core Repository. The interval from 474 to 1,093 feet was split and sampled for analysis. Laborater ry analyses were performed under the supervision of Lance S. Barron, Kentucky Center for Energy Research Laboratory (KCERL) (now known as the University of Kentucky Center for Applied Energy Research), and Henry E. Francis, Kentucky Geological Survey (KGS), University of Kentucky. Catherine Crace (KCERL) and Mark Thompson (KGS) performed the actual laborater ry analyses. GEOGRAPHIC AND GEOLOGIC SETTING The Cominco American core was drilled at a site in northwestern Mason County near the community of Minerva, approximately 2.5 miles east of the MasonBracken county line (Fig. 1). The core hole is on the east 2 High-Carbonate, Low-Silica, High-Calcium Stone In the High Bridge Group, Mason County. Kentucky Study Area Mason County Cominco American Core CA-57 Figure 1. Generalized map of northern Kentucky showing locations of existing mine operations and Boone and Mason County cores, and major highways and railroads. side of Kentucky Highway 435, 1.5 miles east of Minerva along an unnamed tributary of Lee Creek. The immediate area is covered by the Germantown topographic and geologic (Outerbridge, 1971) quadrangle maps, both at a scale of 1:24,000. The core hole is located 2 miles from the Ohio River, and river access is readily available via state highways. Kentucky Highways 435 and 546 ("AA" Highway) furnish access to the network of Federal and State highways in Mason County. The county is served by the CSX System Railroad, which runs from Covington to Ashland through Maysville. The TransKentucky Transportation Inc. Railroad, a subsidiary of CSX Transportation, runs from Maysville to Paris, where it connects with additional CSX systems. The core hole is in the Outer Blue Grass Region, near the southern extent of Pleistocene glaciation. Topography is flat to moderately rolling hills along the Ohio River. The elevation of the collar of the drill hole is 718 feet above sea level, which is about 225 feet above the Ohio River. The site is on the eastern flank of the Cincinnati Arch (Fig. 2). Some faults occur to the east along the LewisMason county line (Schilling and Peck, 1967), but no known faults exist in the vicinity of the core hole. Surface rocks in the immediate area are principally limestone and shale of the Upper Ordovician Kope Formation, Fairview Formation, and the Grant Lake Limestone (Outerbridge, 1971). Pleistocene glacial outwash occurs as sand and gravel deposits along the Ohio River. HIGH BRIDGE GROUP General The High Bridge Group consists of three formations, which are, in descending order, the lyrone Limestone, Oregon Formation, and Camp Nelson Limestone (Fig. 3). Total thickness of the High Bridge in the Mason County core is 510.5 feet, of which the Tyrone is 146.6 feet, the is Oregon is 7.4 feet, and the Camp Nelson is 357.S feet The Tyrone consists of micrograined limestone, and the Oregon consists of very finely crystalline dolomite. The Camp Nelson is a micrograined limestone, partly mottled with finely crystalline dolomite. The depositional environments of the Tyrone, Oregon, and upper Camp Nelson have been interpreted by Cressman and Noger (1976), Horrell (1981), Kuhnhenn and others (1981), Lazarsky (1983), and Gorman (1984). Several thin bentonites serve as useful markers for local and regional correlation in the High Bridge. The two most prominent bentonites occur in the upper Tyrone, and their regional association has been discussed in Huff and Kolata (1990). They are the Millbrig or "Mud Cavet present locally at or near the top of the formation, and the Deicke or ''Pencil Cave," present across the region, 15 to 30 feet below the top of the Tyrone (Wolcott and others, 1972). In the Mason County

High-Carbonate, Low-Silica, High-Calcium Stone in the High Bridge Group (Upper Ordovician), Mason County, North-Central Kentucky