Portal Resources Ltd.
TSX VENTURE : PDO

Portal Resources Ltd.

June 07, 2005 09:15 ET

Portal Resources Ltd.: Geophysics Outlines Large Disseminated Sulphide Target and Drilling Continues at Arroyo Verde

VANCOUVER, BRITISH COLUMBIA--(CCNMatthews - June 7, 2005) - Portal Resources Ltd. (TSX VENTURE:PDO) is pleased to release results of a 87 kilometer Gradient and Pole-Dipole Induced Polarization survey on the Arroyo Verde gold-silver epithermal vein project in Chubut Province, Patagonia, Argentina. The survey covered an extensive area to the south west of the Arroyo Verde rhyolite dome complex where six high grade epithermal gold-silver veins have been defined on surface and in drill holes. Portal is currently testing these veins within the main Arroyo Verde rhyolite dome complex with a 4000 meter reverse circulation-diamond drill program.

The Induced Polarization survey was designed to follow up anomalous areas partially outlined by a previous reconnaissance survey extending 16 kilometers to the south west from the Arroyo Verde dome complex. The survey identified a large sulphide related chargeability anomaly measuring 4 kilometers by 2 kilometers in size, located 9 kilometers southwest of the Arroyo Verde dome complex. The anomaly is strong, registering greater than 15 milliseconds in intensity. This large chargeability anomaly is characterized by a resistivity low which is capped by a 50-100 meter thick flat lying layer with high resistivity. The anomaly is interpreted to be related to a large disseminated sulphide zone overlain by resistive Tertiary age rhyolitic ignimbrite volcanics.

Outcrop within the area of the chargeability anomaly consists of Tertiary age rhyolitic ignimbrites and Silurian age sandstones. These rock units are cut by silicified east west trending fracture zones with disseminated sulphides and oxidized sulphide boxworks. The silicified stockwork sulphide zones are anomalous in lead, barite and silver with assays up to 0.1-0.74% lead, 0.1% barite, and 30 g/t silver. It is thought that the fractured silicified zones are related to leakage from the covered disseminated sulphide target at depth.

Portal Resources is highly encouraged by the large potential sulphide related geophysical target which greatly expands the overall size potential of the Arroyo Verde mineralized system.

The 4000 meter drill program testing the high grade epithermal veins hosted by the Arroyo Verde rhyolite dome complex is proceeding well with a total of eight holes having been completed to date, six within the Principal Vein and two in the Northwest Area. Assay results are anticipated shortly and will be released on a timely basis.

The geophysical work was performed by Quantec Geoscience Argentina S.A., the Argentinean subsidiary of the well respected international Quantec Geoscience Limited under the direction of Mr. Gary Nordin P.Geo. British Columbia, the designated Qualified Person for the Arroyo Verde project in accordance with National Instrument 43-101.

ON BEHALF OF PORTAL RESOURCES LTD.

Bruce Winfield, President & CEO


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