39, GS /y Y | Guc $) Bulletin No. 31. 5, ola lea ap April 18, 1922. . COMMONWEALTH OF PENNSYLVANIA DEPARTMENT OF INTERNAL APRFAIRS James F, Woodward, Secretary nee BUREAU OF TOPOGRAPHIC AND GEOLOGICAL SURVLY George H, Ashley, State Geologist COAL RESERVES IN ALLEGHENY COUNTY, PENNSYLVANIA BY John F. Reese Introdnuetion, In eccnnection with the "Introduction to the Bituminons Coal Pields of Pennsylvania” now being prepared for publication by the Permsyivania Geological Survey, coal’ reserves of the bituminous fields ‘are being. competed by Mr, John F. Reese. In order to render this information available at once without waiting for the uncertain date of printing the report, an abstract of Mr. Reese's fizures for Atlegheny County is given herewith. AlI of the information readily aveilable at this time has been used in the computation, which followed the methods used by the Land Classification Board of the United States Geological Survey in its valuation of the’ public coal Jands, The results are given by becs for each township. For some beds and for some areas the data are abundant and the results entire- dy reliable, For other beds and areas the.data are meager and the results subject to revision as additional data are obtained. All the Cata used and the eomputation sheets are permanently filed so that modifications of the original figures can be made readily when re- quired by additionsl information, The figures presente? are preliminary and subject to correction for any area when that area shall be studied in detail. In the mean- wime critical examination of the figures is’ invited in order that the results may be made as accurate as possible, To that cnd the Survey Will welcome every bit of information not now in its possession. Records of drillings and other data will be kept strictly confiden- tial if so desired, although the Bureau naturally prefers to be able to use data freely. ) George H. Ashley. () on a yn vi ik A (ae i % . é 4 - . 7 4 Pate - i - A ‘ : 24 F ty ar ’ ein . « i : ) s af e ‘ ; ae aya pec ay! ; u i ? Pagel fed SAL Canty Coal -Bods. Allesheny County has three coal beds that are of economic’value at the present time. In order of importance as shipping coals, they are the Pittsburgh, Upper Freeport, and Redstone. aoe Bittsbureh Coal. The extensive development and outerop of this becé th¥oughout the county.shave furnished many measurements of its thickness, and make possible an accurate and reliable computation of quantity. For some localities no informetion is available as to extent of minec out areas. An estimate of probable sie pene has been based upon age of devetoprént and the sige of surrounding overations in these. localities, or on the difference between original areas and statements of areas unnined,. Upper Freeport Coal. The area of this bed has been divided into what are called the “Thick Freevort and the Thin Freeport. From data avai lable, an accurate map of this bed has heen made, closely @efining the limits of the Thick Freeport coal; showing the "faulted" aren in the stutheastern part of the county, and showing the extent and general thickness range or the Thin Freeport within the county. | {Tne areas of thick and thin coal have been separated so as to make en estimate of quantity of coal in cach area, and to enable this Bureau in future to keen an accurate account of the quantity mined from these two fields. This-coal will assure grcater importance as an economic factor each year, due to rapid depletion of the Pittsburgh bed. Redstone Coal. This bed has been computed and considered of OSES aR Ri ORNS SER RT REa yer + < conomic imzortance in Six townships. A fair number of measurenents of its outcrop and in mines have made possible a fairly accurate estirate of quantity. A conservative percentage or recovery has been assumed for: this bed, because when the underlying Pittsburgh coal has been mined, the intervening rocks will cave, thus breaking this bed and making mecovery of this coal both difficult and costly. Other coal beds are mined for local vse, but as they are not important, and little is known of their ext ent and thickness, they have not been included in the commutation of the reserves. Method of Computing Reserves, A base map for each coal bed was mace by tracing its outcrop from the quadrangle maps made by the-U. S. Geological Survey. 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