1. Penrose, R. A. F., A preliminary report on the geology of the Gulf Tertiary of Texas from Red River to the Rio Grande: Texas Geol. Survey First Ann. Rept., p. 97, 1890. 2. Dumble, E. T., Report on the brown coal and lignite of Texas, p. 190, Texas Geol. Survey, 1892. 3-7. Vaughan, T. W., Reconnaissance in the Rio Grande coal fields of Texas: U. S. Geol. Survey Bull. 164, pp. 64-65, 1900. Peter Fireman, analyst. 8-9. Phillips, W. B., Coal, lignite, and asphalt rocks: Texas Univ. Min. Survey Bull. 3, p. 52, 1902. Samples cut in mines and analyses made by O. H. Palm and S. H. Worrell. 10-18. Phillips, W. B., and Worrell, S. H., Fuels used in Texas: Texas Univ. Bull. 307, pp. 14, 20, 33, 34, 50, 1913; S. H. Worrell, analyst, except as stated; 10, 11, sent by companies at solicitation of university in cans furnished by university; 12, represents lot of 1,000 pounds taken by a member of the United States Geological Survey for test at Pittsburgh for War Department; 13, "Llave coal," presumably from prospect on San Pedro bed in Llave Creek near mouth, J. R. Bailey, analyst; 14, sample of 25 pounds received June 17, 1912, from company; 15, sample ("special") taken at University of Texas power house; 16, same (“carloads"); 17, 18, analyses made in connection with dry distillation tests (for gas). 19. Pope, G. S., Analyses of coals purchased by the Government, 1908-1915: Bur. Mines Bull. 119, pp. 38, 39, 85, 1916. Average of 10 samples, from coal delivered to Fort McIntosh, Tex. Contract guaranties: 16.53 per cent ash, "dry coal"; 11,588 British thermal units, "as received." Price, $5.60 a ton. 20. Average of 12 samples from 4,336 tons of 4-inch lump coal delivered to Fort Sam Houston, Tex., 1916-17. Contract guaranties: 3.7 per cent moisture, as received"; 47 per cent volatile matter, "dry coal"; 13.5 per cent ash, "dry coal"; and 12,500 British thermal units, "dry coal." Price, $5.25 a ton. 21. Average of 3 samples from 173 tons of lump coal delivered to Fort McIntosh, Tex., 1916-17. Contract guaranties: 2.7 per cent moisture, "as received"; 47 per cent volatile matter, "dry coal"; 13.5 per cent ash, "dry coal." Price, $4.50 a short ton. 22. Average of 5 samples from 165 tons of lump coal, over 3-inch screen, delivered to Fort McIntosh, Tex., 1915-16. Contract guaranties: 4 per cent moisture, "as received"; 50 per cent volatile matter, "dry coal"; 13.5 per cent ash, "dry coal"; and 12,000 British thermal units, "as received." Price, $4.50 a ton. 23. Sample cut by G. H. Ashley in break-through being cut between rooms 118 and 119, 2,800 feet from shaft. Coal where cut 30 inches thick, not including 2-inch layer of bone 15 inches from top. 24. Sample cut by G. H. Ashley in room 20, entry N, 800 feet N. 60° E. from foot of shaft. Bed 28 inches thick where cut. 25. Sample cut by G. H. Ashley in face of I entry, 1,000 feet due west of foot of shaft. Coal where cut 22 inches thick. 26. Sample cut by G. H. Ashley in side of drift 30 feet from mouth, to test effect of weathering in coals. Coal where cut 26 inches thick. GAS-PRODUCING QUALITIES. A study of the gas-making qualities of these coals, with reference to the production of water gas, was made by the University of Texas. The results of the experiments, which were conducted by Phillips and Worrell, are included in the report on a series of tests of the gasproducing properties of a number of Texas coals.1 Analyses of the Phillips, W. B., and Worrell, S. H., Fuels used in Texas: Texas Univ. Bull. 307, 1913. coals used are given in the preceding table (Nos. 17 and 18). The results of the tests are listed below: After the distillation above recorded a residue that yielded the following results was left in the retorts: Composition and character of residue from gas distillation tests of Santo Tomas coal. The tests of the Santo Tomas coal by low-temperature distillation by the Bureau of Mines gave the following results: Gas: Cubic feet per ton, collected over water, at 0° C. and 760 This yield of 52.5 gallons a ton may be compared with 50.4 and 37.3 gallons a ton obtained by two tests under the same conditions of coal from Cannelton, Pa., which in the past has been successfully used in the production of oil. There can be little doubt of the value of the Santo Tomas coal for this purpose, but as the oil, owing to the low temperature at which it distills off, is composed largely of unsaturated hydrocarbons and not of benzene and related substances, it is necessary, for the production of gasoline, toluol, and other substances that are now in great demand for war purposes, to devise some process such as "cracking" the oil or hydrogenation. The oil as it comes from the still is suitable for ordinary burning and might prove acceptable as flotation oil and for other special uses. This field, on account of its large size and the abundance of coal in sight, would seem to be a favorable place in which to determine by experiments what can be done with such an oil by distillation at different temperatures and at different pressures, and how the oils and tars obtained may be made available for gasoline and other much needed products. LEGEND Coal Bony coal Bone Impure coal Shale Clay Sandstone Limestone 90 Feet FIGURE 38.-Sections showing general stratigraphy of the Santo Tomas coal field, Webb County, Tex. On left, prospect drilling No. 2, Cannel Coal Co.; on right, prospect drilling No. 6, Pilote ranch, Cannel Coal Co. COAL BEDS. GEOLOGIC RELATIONS. The Santo Tomas coal is interbedded with sandstone and shale of Eocene age. (See fig. 38.) According to the following section by Vaughan' the lower of the two beds is about 850 feet above the base of the Eocene series: 1 Vaughan, T. W., Reconnaissance in the Rio Grande coal fields of Texas: U.S. Geol. Survey Bull. 164, p. 45, 1900. Résumé of section of Eocene. 5. The coal beds and the clays and sandstone immediately overlying Feet. 190 4. Below the coal beds is a series of alternations of clay, shale, and 400 3. A series of fine-grained micaceous sandstone... 300 2. The coarsely crystalline Carrizos and stone with a thickness of at 150 1. Bluish clays, ascertained by a well boring, below which are more The following section of a drilling by the Cannel Coal Co. was furnished to Vaughan by D. D. Davis, of the company: Section of prospect drilling No. 2, Cannel Coal Co. 1 Vaughan, T. W., Reconnaissance in the Rio Grande coal fields of Texas: U. S. Geol. Survey Bull. 164, p. 41, 1900. Limestone.. 0 447 0 0 456 0 0 0 0 0 0 464 ) 0 0 3 0 485 0 5 |