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Tham khảo tài liệu 'tiếng anh chuyên ngành địa chất part 10', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | covers an area of approximately 2 km2. This unit is believed to be the main source of the mineralization being investigated. The dominant regional faulting oriontion is northwest-southeast. According to the DGVN. the 13A National highway fault is regarded as a deep fault separating two tectonic zones. It is interpreted to lie between the Dalien and the Nuiphao granites but field evidence for the fault is scanty. The field evidence for the fault consist of cataclasite and limonite zones and it has likely served as a loci for magma intrusion. 3. Mineralization Both bedrock and placer occurrences of tin are widespread in the region and are found along the margin of Tamdao rhyolite and Truckhe and Nuidieng granitoits. Main occurrences are at Sonduong Nuidieng and Thienke Sn-W-Mo skarn . Fracture controlled barite-antimonite mineralization occurs at Lucba and lead-zinc mineralization occurs at Coiky. Tiberon Mineral Ltd took exploration in the region in 1997 until 2001 at the Main Gosson and adjacent to the Dalien granite. Total drilling of 15 074m inl03 drill holes for resource delineation and 783m in Ị1 drill holes for metallurgical sampling. The tungsten bearng mineralization at Nuiphao project is categorized as intrusive related polymetallic greisen and skarn. This skarn and associated greisen-style mineralization are characterized by an assemblage of W-Au-Bi-F-Be bearng minerals that occurs within and proximal to Dalien granite. These metals occur in scheelite wolframit native gold chalcopyrite native bismuth bismuthinite fluorite and danalite. 4. Conclusion A revised resource estimate was completed in Apral 2002 on the Main Gossan which stands at 24 mt @ 0.39 wo O34g t Au 0.28 Cu 0.14 Bi and 10.54 CaF2. The Nuiphao polymetallic skarn greisen deposit is potentially one of the largest unexploited tungsten and fluorite mines of its kind in the world. The initial economic assessment is positive and the deposit has only been partial explored. The new discovery .
