To: James N. Wilson who wrote (197 ) 9/15/1999 10:28:00 AM From: James N. Wilson Read Replies (1) | Respond to of 578
Minefinders - Results from La Bolsa concessions Minefinders Corporation Ltd MFL Shares issued 14,171,685 1999-09-13 close $0.57 Wednesday Sep 15 1999 Mr. Mark Bailey reports The company has received the following results from recent exploration activities completed on the company's 100-per-cent-owned La Bolsa concessions in Sonora, Mexico. La Bolsa resource estimate completed The company recently completed a computer generated block model resource estimate, based on results from 72 drill holes. The new resource estimate increased the La Bolsa deposit to 6.0 million tonnes averaging 1.0 grams per tonne (g/t) gold and 10.0 g/t silver (0.4 of a gram per tonne Au cutoff and capped at 8.0 g/t Au). This shallow-dipping deposit contains more than 190,000 ounces of gold and 1.9 million ounces of silver. The mineralization remains open and future drilling to the south and east will continue to expand and add ounces to the deposit. Within the deposit area, several major mineralizing feeder structures have returned high-grade drill intercepts including: 3.1 metres averaging 8.6 g/t (0.25 of an ounce per ton) Au and 96 g/t (2.8 ounces per ton) Ag and 4.3 metres averaging 10.4 g/t (0.30 of an ounce per ton) Au and 43 g/t (1.25 ounces per ton) Ag. These high-grade zones will be better defined when infill drilling is completed and may result in an increase in the overall deposit grade. Step-out drilling to the south and east of the deposit will explore surface mineralization with rock chip assay values up to 6.9 g/t (0.20 of an ounce per ton) gold. Minefinders is considering options to advance its La Bolsa deposit toward a production decision, including a joint venture or other business arrangement. New prospects on the La Bolsa concessions Initial rock chip sampling programs have now been completed on 10 prospective mineralized systems. The prospective systems were identified during the course of reconnaissance sampling by Minefinders that included collection of over 1,600 stream sediment and 1,250 rock chip samples. Eight of these targets have produced ore-grade gold and silver anomalies and two others returned significant copper values. The more significant values and a brief description of the eight primary gold-silver prospects are presented below. La Dura prospect -- northeast trending zone of strong quartz stock works exposed over a 500-metre by 100-metre area, with moderate silicification and argillic alteration, developed in rhyodacite flows. Mineralization includes an iron oxide gossan, galena, copper and manganese oxides with rock chip assays up to 1,443 g/t (42.1 ounces per ton) silver. Numerous prospect pits, underground workings and a 25-metre by 50-metre open cut expose mineralization over the area. El Malacate prospect -- east-west trending brecciated, quartz stock work zones exposed over a 1,000-metre by 500-metre area. Strong silicification, quartz veining and argillic alteration is developed in conglomerates and siltstones intruded by rhyolite dikes. Rock chip assays of up to 30 metres averaging 2.0 g/t (0.058 of an ounce per ton) gold have been collected across stock works and hematite stained zones. Mineralization and alteration are similar to the La Bolsa deposit. El Ruidito prospect -- east-west trending, up to 15-metre-wide quartz-calcite vein exposed over 600 metres, with rock chip assays up to 5.2 g/t (0.15 of an ounce per ton) gold. Moderate quartz-calcite stock works are found adjacent to the vein in conglomerates and andesite flows. Mineralization and alteration are similar to the La Bolsa deposit. Real Viejo prospect -- northwest trending quartz stock work in felsic volcanics exposed over a 500-metre by 500-metre area. Mineralization includes locally abundant galena and specular hematite with rock chip assays up to 462 g/t (13.5 ounces per ton) silver. Historical activity includes numerous prospect pits and an open cut 20 metres by 30 metres in area. Picacho Alto prospect -- northeast trending quartz stock work vein zones are exposed over a 1,000-metre by 500-metre area. Mineralization is associated with silicification and moderate argillic alteration of conglomerates, sandstones, siltstones and shales intruded by rhyolite dikes. Surface mineralization includes galena and copper oxides with rock chip assays up to 1.1 g/t gold and 329 g/t (9.6 ounces per ton) silver over 10 metres. Numerous old prospect pits. La Verde -- El Tapon prospects -- east-west trending, low angle mineralized zone in rhyodacite flows is exposed over 2,000 metres of strike and up to 20 metres thick. Strong quartz stock works, silicification and gossan, locally containing galena, copper sulphides and oxides. Rock chip assays up to 339 g/t (9.9 ounces per ton) silver and 2.65 per cent zinc. Santa Juliana prospect -- northeast trending quartz stock work and silicified zones exposed over 200 metres along strike, with strong iron oxides, and local galena, sphalerite, and copper mineralization hosted in rhyodacite flows. Rock chip assays up to 1.1 g/t gold and 1,865 g/t (54.4 ounces per ton) silver. Cerro Amarillo prospect -- northeast trending quartz-stock-work zones are exposed over a 1,500-metre by 500-metre area, with silicification, argillic alteration and local gossan developed. Mineralization includes silver sulphides, galena, sphalerite and copper oxides hosted in volcanic flows and sediments, adjacent to an intrusive. Rock chip assays up to 7.7 g/t (0.22 of an ounce per ton) gold and 836 g/t (24.4 ounces per ton) silver have been collected from the prospect. All of these new prospects produced ore-grade mineralization from large areas of alteration in favourable host rocks. Although these prospects have never been drilled, all of them contained some evidence of historical mining. Additional drilling on the La Bolsa deposit is necessary to increase the reserves and bring this discovery to a production decision. Additional surface exploration on the new prospects will advance them to the drilling phase, where excellent potential exists for the discovery of new gold-silver deposits on the La Bolsa concessions. Dolores update The company is completing a more detailed resource block model for the higher grade portion of the two plus million ounce gold and 100 plus million ounce silver deposit on its 100-per-cent-owned Dolores project Chihuahua, Mexico. This better constrained model will more accurately represent grade distribution found within the deposit, allowing for more effective delineation of the higher grade portions of the Dolores deposit. Results will be reported on when available. WARNING: The company relies upon litigation protection for "forward-looking" statements.