^ A°\^-% > .'. ~o j*- + C^^. 'bV V .. <^ 4, *(\^,^/l'„ ^s A* 1 <* '».»* .G* *o *>^T*- A L . ^ A * SIIIB • >$. a v ^wA . "?« .<£■ ♦ffii^ ^c av ♦ 1 KvwA° <>„ <£ *£!liS?k« ^ aV W > V *c> ,G* V *^fs* ./V <* i* ..•■'•J %^>U q0 V^y' ^-^y v^-;/ v^%°° V^'v c5>»C A -^ii^^c aV»^, ,G V ^ **7VT« A <, O > »G V v5. v o^ V T 1 »o J <^ V A v V^V v^\/ V^V CV fc o " ° » *o a* . l ' » <, <^ r 'b^ 'A0^ ^oV* :}flf^ - - '^0^' •^IK'-. "oV*' ;♦ rt o ^°^ .'- ++J ^•o^ V » " * °* cv - ^o< f V^ v-o^ • ^ r oV" ^ ^. ■r V /.^%v ^\^*% ^.^%-\ ^ fe.. ^ ^° sate* "*+ S .-A'i:-. ^ -^° *^k:- ^ A ^ , _ *. v>,ua ^ ^ J .«* >,^^ ^ ^ J w .#*** rr.-.A S% ♦♦"*< 1C 9067 Bureau of Mines Information Circular/1986 Results of Direct-Method Determination of the Gas Content of U.S. Coalbeds By W. P. Diamond. John C. LaScola, and D. M. Hyman UNITED STATES DEPARTMENT OF THE INTERIOR S^Vi Information Circular 9067 Results of Direct- Method Determination of the Gas Content of U.S. Coalbeds By W. P. Diamond, John C. LaScola, and D. M. Hyman UNITED STATES DEPARTMENT OF THE INTERIOR Donald Paul Hodel, Secretary BUREAU OF MINES Robert C. Horton, Director -v ^5 ^0 c\0 frH Library of Congress Cataloging in Publication Data: Diamond, W. P. (William P.) Results of direct-method determination of the gas content of U.S. coalbeds. (Bureau of Mines information circular ; 9067) Bibliography: p. 6-7. Supt. of Docs, no.: I 28.27: 9067. 1. Coalbed methane— United States— Measurement. 2. Mine venti- lation. I. LaScola, JohnC. II. Hyman, D. M. (David M.). III. Title. IV. Series: Information circular (United States. Bureauof Mines) ;j 9067. TN295.U4 [TN305] 622s [622'. 334] 86-600304 CONTENTS Page Abstract 1 Introduction. 2 Acknowledgments 4 Equipment and procedures 4 Sampling 4 Test equipment 4 Calculation of gas content 4 Auxiliary test procedures 5 Summary 6 References „ 6 Appendix. — Results of direct-method gas-content determinations on U.S. coal samples 8 ILLUSTRATION 1. Equipment for direct-method testing of coal samples 4 TABLES 1. Distribution of coal core samples, by State 2 2. Estimates of total in-place methane volumes for U.S. coalbeds 2 3. In-place gas volumes of selected U.S. coalbed areas 3 4. Highest measured gas contents of U.S. coalbeds..... 3 5. States with highest measured gas emissions from coal mines 3 A-l. Results of direct-method gas-content determinations on U.S. coal samples, by coalbed 10 A-2. Results of direct-method gas-content determinations on U.S. coal samples, by State 52 UNIT OF MEASURE ABBREVIATIONS USED IN THIS REPORT cm 3 cubic centimeter h hour cm 3 /g cubic centimeter per gram lb/in 2 pound per square inch ft foot mi 2 square mile ft 3 cubic foot pet percent ft 3 /st cubic foot per short ton RESULTS OF DIRECT-METHOD DETERMINATION OF THE GAS CONTENT OF U.S. COALBEDS By W. P. Diamond, ] John C. LaScola, 2 and D. M. Hyman ] ABSTRACT In 1972, the Bureau of Mines developed a direct-method test for mea- suring the gas content of virgin coal core samples for coal mine health and safety considerations. Since that time, approximately 1,500 coal samples from more than 250 coalbeds in 17 States have been collected for gas content determination. The gas content data, when combined with geologic and engineering studies, can be used as a basis for a prelim- inary estimate of mine ventilation requirements, and to determine if methane drainage in advance of mining should be considered. The data are also critical in delineating coalbed methane resources and in utili- zation feasibility studies. This report makes the Bureau's extensive data base of gas content data more readily available to the coal and gas industries. The data are presented in tabular form, alphabetically by coalbed name and by State. The components of the total gas content (lost, desorbed, and residual gas) are given. Location (State and county), sample depth, coalbed or formation name, and coal rank are included for geographic and geologic identification. * Geologist. ^Physical scientist. Pittsburgh Research Center, Bureau of Mines, Pittsburgh, PA. INTRODUCTION The Bureau of Mines began measuring the gas content of virgin coal core samples in 1972 as part of its compre- hensive Coal Mine Health and Safety research program (1_). 3 The original reason for determining the gas content of coal was for estimating the amount of gas that would be released in active underground mining operations (2-4) . The gas content values can be used for mine planning and resource delineation and for utilization feasibility studies (j^-6_) • In a continuing effort to pro- vide the coal and gas industry with readily available information, this pub- lication presents the Bureau's data base on the gas content of U.S. coalbeds in tabular form. Data on 1,511 coal core samples from more than 250 coalbeds in 17 States are presented. Table 1 gives the distribution of samples by State. It is estimated that coalbeds in the United States contain as much as 766 trillion ft 3 of in-place gas (table 2). The gas is distributed in various amounts throughout the extensive coal deposits of the United States. Esti- mates (10-19) of in-place gas volumes for several coalbeds or coal-bearing formations in selected geographic ar- eas have been made (table 3). It is very important to realize that these values are for in-place gas volumes and do not represent the volume of gas that can be physically and/or economically recovered by coalbed gas drainage sys- tems. Gas contents ranging from essen- tially 0.0 cm 3 /g to 21.6 cm 3 /g (0.0 ft 3 / ton to 691 ft 3 /ton in-place) have been measured. Table 4 is a list of the highest measured gas contents of U.S. coalbeds. ■^Underlined numbers in parentheses re- fer to items in the list of references preceding the appendix. TABLE 1. - Distribution of coal core samples, by State State Alabama , Colorado , Illinois , Indiana , Kentucky , Montana , North Carolina. New Mexico. Ohio , Oklahoma , Pennsylvania. . , Tennessee , Utah , Virginia , Washington. West Virginia. , Wyoming , Total. Number_of_ samples 214 177 25 61 21 34 2 36 15 27 393 3 276 40 6 140 41 1,511 TABLE 2. - Estimates of total in-place methane volumes for U.S. coalbeds, trillion cubic feet Source Bureau of Mines (7)...-. 766 U.S. Department of Energy (8).... 50-700 National Petroleum Council (9)... 398 An indirect measure of the possible safety hazard of methane in coal mines, as well as the resource potential of coalbed methane, is the volume of gas vented from U.S. coal mines. As of the last survey by the Bureau of Mines in 1980 (20), over 256 million ft 3 of meth- ane per day was being vented. The seven States with the highest methane emissions are listed in table 5. Seventy indi- vidual mines vented 1 million ft 3 of methane or more per day. TABLE 3. - In-place gas volumes of selected U.S. coalbed areas Area, Volume , Reference mi 2 lO 12 ft^ 43,700 61.0 10 1,575 31.3 19 6,570 30.0- 110.0 10 414 14.0 11 22,850 10.0- 48.0 10 25,800 5.9- 39.4 10 2,200 8.0- 18.4 10 53,000 5.2- 21.1 10 14,400 5.0- 10.0 10 6,500 3.6- 24.0 10 19,000 1.8- 31.0 10 5,300 1.6- 3.6 10 835 1.8 13 179 1.56 18 1,300 1.5 12 276 1.4- 10.0 15 600 1.1- 1.5 14 3,800 .5- 2.2 10 21,200 .2- 30.9 10 11,100 .2- .8 10 500 .2- .4 17 200 .1 16 Northern Appalachian Basin — OH, PA, MD, WV, KY... Mesaverde Formation (southern Piceance Basin) — CO Piceance Basin — CO Mesaverde Formation (Sandwash Basin) — CO Central Appalachian Basin — KY, MD, TN, VA, WV.... Powder River Basin — MT, WY Raton Mesa region — CO , NM Illinois Basin— IL, IN, KY Black Warrior Basin — AL, MS Western Washington region — WA San Juan Basin — CO, NM Arkoma Bas in — OK , AR Mary Lee Coal group — AL Vermej o Formation — CO Pittsburgh Coalbed — PA, WV Fruitland Formation — CO „ Lower Hartshorne Coalbed — OK Wind River region — WY Greater Green River region — WY , CO Uinta region — UT , CO Upper Freeport Coalbed — PA Beckley Coalbed — WV TABLE 4. - Highest measured gas contents of U.S. coalbeds Coalbed or County and State Depth, ft Gas content Coal rank formation 1 cm/g 2 ft 3 /st Peach Mountain. . . Pocahontas No. 3. Schuylkill, PA.. Buchanan, VA. . . . Tuscaloosa, AL.. Schuylkill, PA.. Tuscaloosa, AL., Le Flore, OK. . . . Sublette, WY... Las Animas , CO. . Raleigh, WV.... Tuscaloosa, AL. 685 1,864 1,504 608 2,132 1,439 3,496 1,158 830 1,365 21.6 21.5 18.7 18.3 17.5 17.1 17.0 17.0 15.3 15.1 691 688 598 586 560 547 544 544 490 483 Anthracite. Low-volatile bituminous. High-volatile A bituminous. Anthracite. Tunnel Mesaverde Group.. Vermejo Formation Medium-volatile bituminous. ND. High-volatile A bituminous. Low-volatile bituminous. Medium— volatile bituminous. ND. ND Not determined. laboratory derived. 2 Estimated in-place. TABLE 5. - States with highest measured gas emissions from coal mines, 1980, million cubic feet per day State Emissions West Virginia 89.1 Alabama. 51.4 Pennsylvania 39.8 Virginia 35.0 Illinois 17.4 Colorado 9.3 ACKNOWLEDGMENTS The Bureau of Mines greatly appreci- ates the cooperation of numerous coal and gas companies and State and Federal agencies in providing exploratory coal cores for gas content determinations. Appreciation is also extended to the U.S. Department of Energy for allowing the Bu- reau access to gas content data collected by its contractors. EQUIPMENT AND PROCEDURES SAMPLING Coal samples for gas content testing are usually obtained by the Bureau from exploratory coreholes of private coal companies. Because of quality testing needs of coal companies, it is generally possible to obtain only enough sample for one gas test on a coalbed. Therefore, it has been Bureau practice to obtain the cleanest section of coal; that is, coal without obvious extraneous shale, pyrite, or other noncoal inclusions. Multiple testing, or even testing of the entire coalbed, would be the preferable sam- pling procedure. A more thorough discus- sion of sampling strategy is presented in reference 5. TEST EQUIPMENT The equipment (fig. 1) required to mea- sure the actual volume of gas desorbing from the coal sample consists of a sample container, an inverted graduated cylinder sitting in a pan filled with water, and a ring stand and clamps to hold the gradu- ated cylinder in place. The desorbed gas that collects in the sample container is periodically bled into the graduated cyl- inder and measured as the volume of water displaced. This procedure is performed at the drill site and, subsequently, in the laboratory. A more thorough discus- sion of the test equipment and procedure, including detailed diagrams of sample containers, is presented in reference 2. CALCULATION OF GAS CONTENT The gas content of a sample is composed of lost, desorbed, and residual gas, each of which is determined by slightly dif- ferent techniques. A core sample begins to desorb gas before it is sealed in the sample container. The amount of this lost gas depends on the drilling medium and the time required to retrieve, mea- sure, and describe the core and seal the sample in the can. The shorter the time required to collect the sample and seal it in the can, the greater the confidence in the lost-gas calculation. In general, because of its speed, wire-line retrieval of the core is preferable to conventional coring. If air or mist is used in drill- ing, it is assumed that the coal begins desorbing gas immediately upon penetra- tion by the bit. With water, desorption is assumed to begin when the core is halfway out of the hole; that is, when the gas pressure is assumed to exceed that of hydrostatic head. The lost gas can be calculated by a graphical method based on the following relationship: For the first few hours of emission, the volume of gas given off is proportional to the square root of the desorption time. A plot of the cumula- tive emission after each reading against the square root of the time that the sam- ple has been desorbing ideally would pro- duce a straight line (2). Valve 50-lb/in gauge /Tpx nverted graduated cylinder Pan of water FIGURE 1. - Equipment for direct-method testing of coal sample. The desorbed gas is simply the total volume of gas drained from the sample and measured in the graduated cylinder. The desorbing of a sample is generally al- lowed to continue until a very low emis- sion rate is obtained, generally an aver- age of less than 10 cm 3 of gas per day for 1 week. The time required to reach this low rate of emission will vary con- siderably depending on the size of the sample, the physical characteristics of the coal, and the amount of gas contained in the sample. At the point at which it is determined to discontinue the measurement of de- sorbed gas, the coal sample will usually still contain gas. To complete the gas determination procedures, the amount of residual gas must be measured. The pro- cedure recommended by the Bureau is to crush the coal in a sealed ball mill. Methods previously used, including a crushing box and a graphical procedure, were found to be unreliable (2^) . The ball mill is tumbled on a roller machine for approximately 1 h to crush the coal. The mill is allowed to cool to room tem- perature, and the volume of gas released is measured by the water displacement method. The crushed powder and any un- crushed lumps are weighed separately. The volume of gas released is attributed only to the crushed powder. The total gas content of a particular sample is the volume of lost gas and desorbed gas di- vided by the total sample weight plus the residual gas content. Theoretically, it is possible to crush a coal sample in the ball mill at any point after collection and to obtain the total gas content (excluding lost gas) of the sample. This procedure generally is not considered appropriate if maximum in- formation from the sample is desired. By crushing the sample before the desorption process is complete, it is impossible to obtain the relative amounts of desorbed and residual gas. This distinction is important because the actual residual gas, which will not desorb from the sam- ple while sealed in the canister, proba- bly represents gas that will not flow to a methane drainage borehole, and possibly represents gas that will not be emitted into a mine atmosphere. During the pro- cess of mining coal, the coal is broken up into variously sized pieces; however, the majority of these pieces usually will not duplicate the very fine powder that the ball mill produces in the residual gas procedure. AUXILIARY TEST PROCEDURES The gas content values listed in the appendix of this report are at ambient field as well as laboratory conditions and have not been corrected to standard temperature and pressure (STP). The di- rect-method test as originally developed by the Bureau of Mines' was intended to be a "simple," inexpensive procedure that could be easily utilized by the mining industry to determine the methane poten- tial of coalbeds. An assessment of the potential influence of temperature and barometric pressure on the direct-method values under the general environmental conditions expected did not seem to jus- tify the additional expense and complica- tions of including an STP correction ca- pability in the procedure. In support of this original premise, the results of a recent study (21) conducted on 22 coal samples from Alabama showed that desorp- tion values corrected for STP averaged 5.3 pet less than the ambient values, with the range being 4.4 to 7.0 pet. The Bureau of Mines is testing apparatus and procedures to conveniently integrate STP corrections into the direct-method test procedures for those who desire the rela- tively small increase in accuracy. To enhance the reliability of the test re- sults in the Bureau of Mines procedure, the desorption environment is maintained as constant as possible, especially with regard to temperature, which can be con- trolled once the sample is taken from the field to the laboratory. An additional factor currently under investigation that appears to influence the measured gas volume is and/or reaction of oxygen (air trapped with the coal the container is initially the coal sample. Preliminary studies in- dicate that the phenomenon occurs to the sorption and nitrogen sample when sealed) with varying degrees; however, all the factors that influence the magnitude of the im- pact on the final gas content value are currently unknown. Compositional analy- sis of the gas in sealed containers with coal samples indicates that sorption and/ or reaction of oxygen and nitrogen with the coal is more obvious several days after the sample has been placed in the desorption container. This sorption and/ or reaction will generally stabilize be- fore the desorption of methane is com- plete. In order to quantify the affect of sorption and/or reaction of oxygen and nitrogen on the gas content values, a gas compositional analysis must be made each time a gas volume is measured by the wa- ter displacement method. Periodic gas compositional analysis have been recom- mended by the Bureau of Mines (_2, _5) for several years to determine the percent of methane as well as any other gases such as carbon dioxide that make up the de- s orbed gas volume. Since the amount of "free" space in the desorption container after adding the coal sample controls the amount of air initially trapped within the container, keeping this free space to a minimum by filling the "standard" size containers as full as possible with coal, or having containers of various sizes available for various coal sample sizes will help minimize any gas sorption and/ or reaction problem. Proximate, ultimate, and Btu analyses are obtained on the crushed powder from the residual gas test. These test re- sults can be used to further evaluate the gas content results on a practical and theoretical basis. Because the gas content is presented as a volume-to- weight ratio, the presence of noncoal ma- terial, primarily shale and pyrite — which add weight but not gas storage capacity — can produce seemingly erroneous data. Thus, two samples from the same coalbed core may have gas contents that vary by several cubic centimeters per gram if one sample contains appreciably higher non- coal material. The coal analysis will help determine if noncoal material is in- fluencing the total gas content. Theoretical studies on the influence of depth of burial on the gas content are done preferably on a clean-coal ba- sis, thus removing the noncoal-material variable from the evaluation. However, because coalbeds do contain noncoal ma- terial, the actual in-place methane in a particular volume of coal should be re- lated to the as-received coal data. Theoretically, the gas content of coal is influenced by the rank of the coal, with higher ranks generally having higher gas contents. The coal analysis can be used to determine the apparent rank of the coal by ASTM Standard D388 (22) for evaluation of the rank parameter. SUMMARY Gas content determinations are report- ed on 1,511 virgin coal core samples col- lected since 1972. The results of these determinations and associated tests are summarized in tabular form in the ap- pendix. Additional coal samples con- tinue to be acquired for gas content de- termination. New data are entered into the Bureau's coalbed methane data base (23) from which this report has been syn- thesized. Updated printouts of data from specific coalbeds or geographic areas are available from the Bureau's Pittsburgh Research Center. The gas content data contained in this report, when combined with geologic and engineering studies, can be used as a ba- sis for a preliminary estimate of mine ventilation requirements, and to deter- mine if methane drainage in advance of mining should be considered. The distri- bution of gas volumes in a region can be used to delineate areas of high in-place gas volumes where mining may be adversely affected but where resource recovery and utilization may be enhanced. REFERENCES 1. Skow, M. L. , A. G. Kim, and M. Deul. Creating a Safer Environment in U.S. Coal Mines. The Bureau of Mines Methane Control Program, 1964-79. A Bu- reau of Mines Impact Report. BuMines Spec. Publ. , 1980, 50 pp. 2. Diamond, W. P., and J. R. Levine. Direct Method Determination of the- Gas Content of Coal: Procedures and Results. BuMines RI 8515, 1981, 36 pp. 3. MuCulloch, C. M. , J. R. Levine, F. N. Kissell, and M. Deul. Measuring the Methane Content of Bituminous Coal- beds. BuMines RI 8043, 1975, 22 pp. 4. Kissell, F. N. , C M. McCulloch, and C. H. Elder. The Direct Method of Determining Methane Content of Coalbeds for Ventilation Design. BuMines RI 7767, 1973, 17 pp. 5. Diamond, W. P. Site-Specific and Regional Geologic Considerations for Coalbed Gas Drainage. BuMines IC 8898, 1982, 24 pp. 6. . Evaluation of the Methane Gas Content of Coalbeds: Part of a Com- plete Coal Exploration Program for Health and Safety and Resource Evaluation. Pa- per in Coal Exploration (Proc. 2d Int. Coal Exploration Symp., Denver, CO, Oct. 1-4, 1978). Miller Freeman Publ. , v. 2, 1979, pp. 211-222. 7. Deul, M. , and A. G. Kim. Methane Drainage — An Update. Min. Congr. J. , v. 64, No. 7, 1978, pp. 38-42. 8. U.S. Department of Energy. Na- tional Energy Plan II, A Report to the Congress Required by Title VIII of the Department of Energy Organization Act. May 1979, p. 95. 9. National Petroleum Council. Un- conventional Gas Sources, Volume II, Coal Seams. June 1980, p. 14. 10. Rightmire, C. T., G. E. Eddy, and J. N. Kirr. Coalbed Methane Resources of the United States. Am. Assoc. Pet. Geol. , 1984, 378 pp. • 11. Boreck, D. L. , C. M. Tremain, L. Sitowitz, and T. D. Lorenson. The Coal- bed Methane Potential of the Sand Wash Basin, Green River Coal Region, Colorado. CO Geol. Survey OFR 81-6, 1981, 25 pp. 12. Diamond, W. P. , and G. W. Murrie. Methane Gas Content of the Pittsburgh Coalbed and Evaluation of Drilling Re- sults at a Major Degasif ication Instal- lation. Pres. at 12th Ann. Meetings, Northeastern Sec. , Geol. Soc. America, Binghamton, NY, Mar. 31-Apr. 2, 1977; Ab- stract in Programs, v. 9, No. 3, Feb. 1977, p. 256. 13. Diamond, W. P. , G. W. Murrie, and C. M. McCulloch. Methane Gas Content of the Mary Lee Group of Coalbeds, Jeffer- son, Tuscaloosa, and Walker Counties, Ala. BuMines RI 8117, 1976, 9 pp. 14. Iannacchione, A. T., and D. G. Puglio. Methane Content and Geology of the Hartshorne Coalbed in Haskell and Le Flore Counties, OK. BuMines RI 8407, 1979, 14 pp. 15. Kelso, B. S., S. M. Goolsby, and CM. Tremain. Deep Coalbed Methane Po- tential of the San Juan River Coal Re- gion, Southwestern Colorado. CO Geol. Survey OFR 80-2, 1980, 56 pp. 16. Popp, J. T., and C. M. McCulloch. Geological Factors Affecting Methane in the Beckley Coalbed. BuMines RI 8137, 1976, 35 pp. 17. Steidl, P. E. Geology and Methane Content of the Upper Freeport Coalbed in Fayette County, Pa. BuMines RI 8226r, 1977, 17 pp. 18. Tremain, C. M. The Coalbed Meth- ane Potential of the Raton Mesa Coal Re- gion, Raton Basin, Colorado. CO Geol. Survey OFR 80-4, 1980, 48 pp. 19. . Coalbed Methane Potential of the Piceance Basin, Colorado. CO Geol. Survey OFR 82-1, 1982, 49 pp. 20. Grau, Roy H. , and J. C. LaScola. Methane Emissions From U.S. Coal Mines in 1980. BuMines IC 8987, 1984, 13 pp. 21. Camp, B. S., F. H. Briscoe, P. G. Malone, and C. M. Boyer II. Special Data Package, Preliminary Geologic Report-Rock Creek Methane From Multiple Coal Seams Completion Project, Gas Research Insti- tute Contract 5083-214-0847, May 1985, 15 pp; available upon request from Gas Re- search Institute, Chicago IL. 22. American Society for Testing and Materials. Standard Specification for Classification of Coals by Rank. D388 in 1977 Annual Book of ASTM Standards: Part 26, Gaseous Fuels; Coal and Coke; Atmos- phere Analysis. Philadelphia, PA, 1977, pp. 214-218. 23. Diamond, W. P., and D. M. Hyman. A Computer-Implemented Data Base for Coalbed Methane Resource Characterization and Research (Proceedings, Unconventional Gas Recovery Symposium, Soc. Pet. Eng. , AIME, and U.S. Dep. Energy, Pittsburgh, PA, May 16-18, 1982). SPE/DOE 10806, 1982, pp. 165-169. APPENDIX. — RESULTS OF DIRECT-METHOD GAS-CONTENT DETERMINATIONS ON U.S. COAL SAMPLES Tables A-l and A-2 are a compilation of direct-method test results on coal sam- ples collected between 1972 and mid-1983. The results are listed alphabetically by coalbed in table A-l and by State in table A-2. To better evaluate the total gas content of each sample, the component parts of the total are listed. The major physical and chemical variables known to affect the gas content of coal sam- ples are provided if available. Space limitations preclude the listing of all detailed data associated with each sam- ple, but this information may be availa- ble for specific samples from the Bu- reau's Pittsburgh Research Center. The Bureau also has published detailed geo- logic studies related to the occurrence of methane in selected coal measures. A bibliography of these papers, as well as other topics related to the occurrence and premining drainage of methane, is also available from the Pittsburgh Re- search Center. DISCUSSION OF DATA PRESENTED IN TABLES A-l AND A-2 Coalbed . — Coalbed names are generally those assigned by the cooperating coal companies or by other agencies supplying samples or data to the Bureau. If the name of the coalbed is unknown, either the group (GRP) or formation (FM) is listed, or the sample is catalogued by the State name followed by (UNC) for "un- correlated." A question mark (?) fol- lowing the coalbed name indicates that the name is probably correct, but the coal may be miscorrelated. Because of space limitations on the computer print- out, coalbed names have occasionally been abbreviated. Several States utilize a numerical or letter designation in addi- tion to (or in place of) a name. Where this is common practice and when space permits, the alternate designation is provided in parentheses. The following abbreviations for different benches of the same coalbed are used in association with the coalbed name: (U) = upper, (M) = middle, and (L) = lower. In several instances, letter designations (in as- cending order beginning with A) have been assigned to different benches of the same coalbed. An R following a coalbed name indicates a rider coal. If more than one rider is present, numerical designation (in ascending order beginning with 1) have been assigned. State and county . — Coal companies are generally reluctant to permit publication of the exact location of their explora- tory core holes. The location of sample collection sites are, therefore, identi- fied only by the State and county. Sample depth . — The measured depth of the bottom of the sample placed in the desorption container, rounded off to the nearest foot. Lost gas . — That portion of the total gas content lost before the coal sample was sealed in the canister, estimated by the graphical procedure described in the text. An "ND" in the "Lost gas" column indicates that the lost gas could not be calculated, usually because of incom- plete sample data. Values are at ambient conditions. Desorbed gas . — That portion of the to- tal gas content liberated from the sam- ple while it is sealed in the collec- tion container and measured directly by the water-displacement method described in the text. Values are at ambient conditions. Lost plus desorbed gas (Lost + desrb gas) . — Determined by adding the lost and desorbed gas and dividing by the total sample weight; it represents the gas that desorbed from the sample naturally. This may be the only valid gas content data for those samples for which residual gas was determined by the crushing box or graphical procedures (2^). This value is probably less than the actual total gas content of those samples. The values shown in this column may not equal the combined total of the " Lost gas" and "Desorbed gas" components previously dis- cussed because of independent rounding of the data in those columns. Values are at ambient conditions. ^>MH Residual gas and crushing method . — That portion of the total gas content of the sample remaining in the coal at the end of the desorption period, which will not freely desorb from the coal while sealed in the container. The residual gas has been determined by three methods: CB = crushing box, G = graphical, and BM = ball mill. The crushing box method was determined to be unreliable; therefore, the graphical procedure based on the crushing box must be considered unrelia- ble. The residual gas data obtained from the ball mill is considered valid. An ND or a dash in these columns indicates that the value was not determined, usually because the donors did not want the sam- ples to be crushed. Values are at ambi- ent conditions. Total gas . — Determined by adding the "Lost + desorbed gas" column and the "Re- sidual gas" column. The total gas con- tent (subject to the validity of the re- sidual gas) represents the gas content of the coal sample on an as-received basis. Laboratory-derived values in cubic cen- timeters per gram can be converted to in- place values in cubic feet per ton by multiplying by 32. Values are at ambient conditions. Apparent rank (Rank app) . — Determined from coal analysis data by the method described in ASTM Standards D388 (18). The abbreviations (samples from all coal groups may not appear in table A-l) cor- respond to the following standard coal groups: M-Ant — Meta-anthracite. Ant — Anthracite. Semi -Ant — Semianthracite. LV — Low-volatile bituminous. MV — Medium-volatile bituminous. HV-A — High-volatile A bituminous. HV-B — High-volatile B bituminous. HV-C — High-volatile C bituminous. Sub-A — Subbituminous A. Sub-B — Subbituminous B. Sub-C — Subbituminous C. Lig-A — Lignite A. Lig-B — Lignite B. A dash ( — ) in the "Apparent rank" column indicates that a rank determination could not be made because of the lack of coal analysis data. If the word "None" ap- pears in this column, the mineral mat- ter content of the sample is too high (greater than 50 pet) to assign a coal rank. Percent ash, as-received proximate analysis (Ash ar-p) . — Data are presented to permit an evaluation of the possible effect of the amount of ash on the total gas content of the sample. Because the mineral matter represented by the ash in the coal analysis adds weight but gener- ally no gas, an abnormally low gas con- tent may be measured if a high mineral matter content is present. An "ND" in this column indicates that a coal analy- sis was not obtained on the sample. U.S. Bureau of Mines identification code (USBM ID) . — Code number assigned to each coal sample processed for gas con- tent determination by the Bureau. 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