2003-11-20 17:06 ET - News Release
Mr. Marcus Foster reports
NEW AREA OF PORPHYRY STYLE MINERALIZATION DISCOVERED AT EL PULPO
Ross River Minerals has discovered a new copper porphyry zone and extended the known mineralized zones of both the Papaya and La Trucha targets on its El Pulpo property in Mexico. To date, the company has identified three copper porphyry targets and four gold-silver-copper vein targets on the 200-square-kilometre property.
A new area, named the Langosta target, consisting of strong quartz-sericite-pyrite (phyllic) alteration with stockwork quartz veining, has been identified extending southward along a tributary creek (Quebrada Magistral) 2,000 metres east of the Papaya target, approximately 2,500 metres southwest of La Cetolla copper porphyry target and 600 metres northeast from the El Bagre copper target on Rio Los Frailes. Phyllic alteration is observed, to date, on the north side of Rio Los Frailes over a distance of 100 metres and over a distance of 150 metres on the south side of Rio Los Frailes. This alteration extends outward from a core of potassic alteration consisting of secondary biotite and potassium feldspar and minor magnetite over a distance of 210 metres in a southerly direction. These two styles of alteration characteristic of porphyry systems are hosted within an altered granodiorite to quartz-diorite intrusive complex.
Copper mineralization observed along Quebrada Magistral, within the altered granodiorite to quartz-diorite, consists of veinlets, disseminations and clusters of chalcopyrite (approximately 5 to 10 per cent). At higher elevations within this mineralized area, clusters of arsenopyrite mineralization (approximately 1 to 5 per cent) have also been identified. Secondary copper oxides within this area consist of malachite and black copper oxides. The extent of the mineralized area mapped so far measures approximately 100 metres (north to south direction) and 75 metres (east to west direction) and remains open in all directions. A total of 25 panel and chip samples have been taken from this area and analytical results are pending. Geologic mapping and sampling are continuing to determine the dimension and grade of this altered and mineralized porphyry system. Samples are being prepared at GM-Lacme Laboratories in Guadalajara, Mexico, with final analyses being carried out by Acme Analytical Laboratories Ltd. in Vancouver, B.C. Victor Jaramillo, PGeo, is the qualified person supervising the work in this area.
Geological mapping and prospecting on the Papaya target, which has assays averaging 12.33 grams per tonne (g/t) gold, 267.78 g/t silver and 0.46 per cent copper over 2.2 kilometres (see news in Stockwatch on Aug. 21, 2003), have extended the projection of the quartz-tourmaline vein system 1.3 kilometres northward. The strike length so far encountered is now over 3.5 kilometres. Hematite and copper oxides within quartz-tourmaline veining similar to those previously obtained from the Papaya have been found and sampled.
Similarly, new copper- and hematite-bearing quartz-tourmaline veining has been found up to one kilometre southwest of La Trucha target extending toward the Papaya target. Previous samples from La Trucha target have assays averaging 8.64 g/t gold, 357.6 g/t silver and 1.12 per cent copper (see news in Stockwatch on Sept. 2, 2003). To date, 51 samples from the Papaya and La Trucha targets have been collected under the supervision of Paul Kallock, PGeo. Analyses of these samples are being completed at Acme Analytical Laboratories Ltd. in Vancouver, B.C.
Road rehabilitation toward the Cerro Colorado target will be completed in two days and road and trench construction will commence on the La Trucha and Papaya targets immediately following.
Ed
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