Coal Resources of Beaver County, PennsylvaniaU.S. Government Printing Office, 1963 - 33 páginas Prepared in cooperation with the Pennsylvania Bureau of Topographic and Geologic Survey. |
Términos y frases comunes
15-minute quadrangle Allegheny 42 inches thick 42 Total inches acre-foot Allegheny Formation anticline areas Bakerstown Beaver County Beaver River beds of indicated bituminous coal Brookville Brush Creek coal Castle coal reserves coal Shale Conemaugh Formation Connoquenessing Creek Creek coal bed Darlington Township DeWolf Dry FC estimate feet thick Freeport coal bed Geologic Survey high-volatile Homewood coal Homewood Sandstone Member inches inches 14-28 inches inches inches indicated thickness Inferred reserves Kittanning coal bed Lawrence County locally Lower Freeport coal Lower Kittanning coal Mahoning Sandstone Member Mercer County Middle Kittanning coal miles million tons millions of short mining Moist Btu Ohio original reserves Pennsylvania Geol Pennsylvanian age Pottsville Formation Quakertown ranges in thickness Reese and Sisler reserves in beds reserves of coal reserves of Lawrence Sharon coal Shenango Rivers short tons siltstone stratigraphic Total inches inches U.S. Geological Survey Underclay unnamed shale Upper Freeport coal Upper Kittanning coal Vanport Limestone Member western Pennsylvania Zelienople
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Página A-26 - ... measured, indicated, and inferred. Measured coal is coal for which tonnage is computed from dimensions revealed in outcrops, trenches, mine workings, and drill holes. The points of observation and measurement are so closely spaced, and the thickness and extent of the coal are so well defined that the computed tonnage is judged to be accurate within 20 percent or less of the true tonnage.
Página A-26 - Tonnage is computed partly from specified measurements and partly from projection of visible data for a reasonable distance on the basis of geologic evidence. In general, the points of observation are about 1 mile apart, but they may be as much as 1-1/2 miles apart for beds of known continuity.
Página A-35 - THE BEAVER RIVER DISTRICT OF THE BITUMINOUS COAL FIELDS OF WESTERN PENNSYLVANIA. By IC White; pp. 337, illustrated with 3 Geological maps of parts of Beaver, Butler, and Allegheny Counties, and 21 plates of vertical sections — 1875. Price, $1 40 ; postage, $0 20.
Página A-26 - Inferred reserves are those for which quantitative estimates are based on a broad knowledge of the character of the bed or region and for which there are few, if any, measurements. The estimates are based on an assumed continuity for which there is good geologic evidence.
Página A-27 - Inferred coal is coal for which quantitative estimates are based largely on broad knowledge of the geologic character of the bed, or region, and for which there are few, if any, measurements. The estimates are based on an assumed continuity for which there is geologic evidence.
Página A-6 - Mississippian sequence includes shale, siltstone, and fine- to medium-grained sandstone in beds ranging in thickness from a few inches to about 3 feet.
Página A-1 - About 70 percent of the reserves is concentrated in the Lower Kittanning, Middle Kittanning, and Homewood coal beds, and most of the mining is concentrated in the Middle Kittanning coal bed. Before 1945, mining in the county was carried on largely by underground methods; since 1945, mining has been largely by stripping methods.
Página A-27 - ... date of appraisal and are obtained by subtracting from original reserves the past production and losses by fire, flooding, and caving. Recoverable reserves are reserves of coal in the ground as of the date of appraisal that could be produced in the future under the present economic conditions; they are obtained by subtracting from remaining reserves the estimated future losses in mining. In this report, reserves for fields in which there has been considerable mining are given as remaining reserves...
Página A-30 - Pennsylvania is shown on figure 6. nalysis: 1, as received; 2, moisture free; 3, moisture and ash free; 4...