ESO Uranium Corp.
TSX VENTURE : ESO
FRANKFURT : E2G

ESO Uranium Corp.

April 19, 2010 09:30 ET

ESO Preliminary Work Shows Higher Boron Values From Samples on Original Claims on Nevada Lithium Playa Property

VANCOUVER, BRITISH COLUMBIA--(Marketwire - April 19, 2010) - ESO Uranium Corporation (TSX VENTURE:ESO)(FRANKFURT:E2G) - The Company is pleased to announce that it has analyses of preliminary sampling of surface sediments on the Teels Marsh playa. This new sampling returned boron values of 1615, 2165, 2245, 2645 parts per million boron, which is equivalent to 5200, 6970, 7230, 8520 ppm Borate (0.52%, 0.70%, 0.72%, 0.85% respectively). These samples cover an area of approximately 1 sq. mile (260 hectares), at the west end of Teels Marsh which is included within the original claims under option. These claims may not be overstaked by third party placer claims according to staking regulations in the State of Nevada.

Historical reporting by the US Geological Survey (Open File Report: 76-567) indicate Lithium concentrations in the Teels Marsh playa brines of up to 850 ppm. The Journal "Clays and Clay Minerals" (Vol. 29, No.5, 341-352, 1981) of The Clay Minerals Society reports boron concentrations from interstitial brines associated with tuff beds in the Teels Marsh playa. Samples located within claims staked on open ground on behalf of ESO returned values of 699, 719 and 893 ppm (mg/liter) Boron which is equivalent to 2,250, 2,315 and 2,875 ppm borate (B2O3) respectively.

Further claims were acquired (see news release dated March 26th 2010) in order to extend mineral tenure over the southwest end of the playa and its pediment covered flanks. The areas covered by pediment include areas where sand and gravel have been periodically flushed into the margins of the playa, originally a much deeper basin, by the larger drainages into the playa. Subsequent flooding by lithium and boron rich waters trapped in the basin would form brines by evaporation and the sand and gravel beds would become brine rich aquifers in the package of basin sediments.

Ulexite (sodium calcium borate) production was carried out in the 1870's on the east end of the playa by "Borate" Smith. This property eventually became part of the early history of the giant borate producer, U.S. Borax, a wholly owned subsidiary of one of the world's largest mining companies, Rio Tinto PLC. Francis Marion Smith shipped borax, recovered in a small plant on the edge of Teels Marsh, in 30 ton loads to the Central Pacific Railroad at Wadsworth Nevada. The operation, using a 24 mule team, hauled two wagons of borate and one of water and food for the 160 mile journey, a precursor to the use of the 20 mule teams hauling from Death Valley, and the Borax trade name.

Boron and lithium constitute two elements that are increasingly used in the production of the new high technology materials being incorporated in today's manufactured products.

Apart from detergents and glass products, borax is the starting point for many other boron chemicals; boron nitride, for example, in a low temperature form, is used as a foundation base in cosmetics since it is an inert lubricious white powder - with more temperature and pressure it is converted to the second hardest mineral after diamonds. With high heat conductance, like diamond, it is used as a cutting tool material. This material also has other properties that make it suitable for the manufacture of the super capacitors that assist in the fast capture of electrical energy in regenerative braking by electric vehicles. The website of U.S Borax describes many more of the useful products that company has developed in its responsible efforts to develop markets for boron.

Lithium, in addition to a range of uses in high temperature lubricants, pharmaceuticals, enamel glazes and as a light alloying metal, is an important component of the new, light weight, long life, high energy density batteries being developed for the production electric and hybrid cars today. There is only one lithium brine producer in the U.S.A., Chemetal-Foote in Clayton Valley, located approximately 40 miles SE of Teels Marsh. When Foote Minerals started this operation, the company closed its lithium pegmatite (hard rock mining) operations in the Carolinas because the low cost of production of lithium products from brines was such a large economic advantage, even with the paid-off installed capital cost of the pegmatite mines. With markets projected to expand for battery production, room can be made for new, low cost producers.

On behalf of the Board of Directors of ESO Uranium Corp.

Ben Ainsworth, PEng. BC., Vice President, Exploration

B. Ainsworth has reviewed the data and sources for this news release and is the Qualified Person for the Company in this matter.

Please refer to the ESO Uranium website for further and updated information.

Statements contained in this news release that are not historical facts are forward looking statements as that term is defined in the private securities litigation reform act of 1995. Such forward looking statements are subject to risks and uncertainties which could cause actual results to differ materially from estimated results. Such risks and uncertainties are detailed in the Company's filing with the Securities and Exchange Commission.

The TSX Venture Exchange has not reviewed nor accepted responsibility for the adequacy or accuracy of the contents of this news release which has been prepared by management.

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