Other companies have concessions for work near the Lake, at the east, south, and southwest. One was hampered by wild Indians, compelling the employment of armed guards, another by extremely unhealthful conditions; but both after some unsuccessful work have found promising wells. The Colon Developing Company, with a large property 100 miles west of Encontrados and near the Colombian border, has struck oil at less than 1300 feet, close to the Rio de Oro. Two thousand barrels of high grade oil were produced within 24 hours, but as no facilities for transport existed the well was capped. This oil is said to be of quality superior to that east of the Lake, which is better than the Mexican. East of the Lake, another field, north of the Mene Grande, is owned by the Venezuelan Oil Concessions. Wells drilled here have passed through three oil bearing sands; the deeper, the better and lighter the oil. One has spouted 80 feet high; another over the top of the derrick. An area of several square miles is proved. This Company has 3000 square miles of oil bearing land near the Lake for 50 years. In Mexico wells producing 100,000 barrels a day are seen. The general manager of this Company believes the Venezuelan wells will be bigger. The Venezuelan Falcón Oil Syndicate, which has a 50 year concession of over 2000 square miles in Falcón, expects to open up many fields. Pipe lines could converge and refineries be installed within 50 miles of the farthest point. The first well drilled is 37 miles from the seaboard. Motor tractors are employed. The British Controlled Oilfields has taken over the Bolívar Concessions, which has the right to bore in 7,000,000 acres in Falcón. On the Island of Trinidad 362,800 barrels of crude petroleum were produced in 1920. Near this Island, corresponding to the oil region at the northwest of Venezuela, is one at the northeast around the Gulf of Paria, especially at the south, and comprising the Orinoco Delta. Here is found the heavier form of petroleum in large quantities. Some wells have been drilled on the Peninsula of Paria with no good result. The Guanoco Field, south, is believed to cover the axis and flanks of the Guanoco anticlines, of which the southern is thought to be responsible for the great oil seepages of the Asphalt Lake. The field is believed to extend 60 miles southwest, to and beyond the San Juan River. The first well was drilled (1912) in the Lake. Heavy oil, specific gravity 1.02, was found under enormous gas pressure, making operations difficult. Production of 1000 barrels a day was secured at 615 feet, but the well was closed to avoid waste. Later it produced in three months 50,000 barrels. Other wells have been drilled in the vicinity, also on Pedernales Island in the Delta; the oil from the latter of lighter gravity. For some purposes the heavy oil is of special value. It is too heavy to pump, but the strong gas pressure makes it available. The areas are swampy, difficult to work, and unhealthful.