QUESTION OF SALT WATER 273 



Hayes, although two other wells only 1,000 feet distant have rock pres- 

 sures of only 580 pounds, or the same as the Casiano wells. Hence, 

 until a well like this one or Casiano No. 7 does actually "go to hot water 

 suddenly," the danger from that source must be regarded as entirely 

 theoretical and remote rather than practical and imminent. 



Casiano well No. 7 is undoubtedly the greatest oil producer of the 

 world, so far as total output is concerned. The Potrero del Llano well 

 of the Mexican Eagle Company has the greater daily capacity (100,000 

 barrels), but as it has been shut in much of the time since it was con- 

 trolled, early in 1910, its commercial production is not yet probably half 

 that of Casiano well No. 7, which was about 19,000,000 barrels up to 

 December 1, 1912, and still continuing its great product]on of 23,000 

 barrels daily with marvelous regularity, having no water whatever and 

 only two-tenths of 1 per cent of sediment. 



From this review of the Mexican Gulf coast fields it can readily be 

 seen that it is one of the greatest oil regions yet developed and that it 

 gives promise of supplying much fuel in competition with coal to all of 

 our Atlantic coast cities. The cost of the oil to the Mexican Petroleum 

 Company, delivered on board tank steamers at Tampico, is slightly less 

 than 14 cents per barrel of 42 gallons, and the cost of transportation 

 from there as far north as Boston is only about 20 cents per barrel. 



Other undeveloped Oil Localities 



Besides the regions where petroleum has already been developed, by 

 drilling in the localities of large seepages like Ebano, Casiano, Potrero 

 del Llano, and others, the following additional localities at which prom- 

 inent seepages occur were noted by the writer: 



Cerro Azul. 



Chapopotillo. 



Juan Felipe. # 



Tres Hermanos. 



Moralillo. 



Chichihual. 



Chapopote Nunez. 



Cerro de Tiapajua 



Los Higueros. 



Lei non. 



Cerro Viejo. 



Palo Blanco. 



Cerro de los Barrachos. 



Rancho Abajo. 



Cuchillo del Pulque. 



Zacamixtle. 



San Geronimo. 



Monte Grande. 



Monte Alto. 



La Laja de Monte 



San Miguel des Tres Aguas. 



Ojo de Brea. 



La Merced. 



Callejon. 



Chinampa. 



Rio Clara. 



Cervantes. 



San Francisco. 



Monte Gordo. 



Los Mosqnitos. 



