Rosendal Scoping Study

Tertiary Minerals PLC 8 January 2002 www.tertiaryminerals.com JANUARY 8, 2002 INDEPENDENT SCOPING STUDY INDICATES PAYBACK IN LITTLE MORE THAN TWO YEARS AND AN IRR OF 33% FOR ROSENDAL TANTALUM PROJECT * Capital Cost Of US$12.5 Million Assumes Construction Of All-New Process Plant * Annual Output Of 66,000lb Tantalum Pentoxide And 84,000 Tonnes Feldspar ________________________________________________________________________________ AIM-listed Tertiary Minerals plc is pleased to announce that an independent technical and economic scoping study on the development of its Rosendal tantalum-industrial mineral project in south-west Finland has shown that development of the project could be economically attractive with a projected Internal Rate of Return ('IRR') of 33%. The scoping study has been carried out by a special team assembled by the Geological Survey of Finland which has estimated the Rosendal pegmatite to contain 1.3m tonnes of material grading 289grammes/tonne ('g/t') of tantalum pentoxide ('Ta2O5') and 70% feldspar from surface to a depth of 100m. The study builds on the results of previously reported metallurgical testwork carried out by independent Canadian laboratory Lakefield Research Inc. This indicated that commercial grades of tantalum, feldspar quartz and mica concentrate could be produced from Rosendal ore with acceptable recoveries. The scoping study has evaluated an open-pit mining operation producing 150,000 tonnes of ore per annum over 11 years with 10% dilution and an overall waste-to-ore strip ratio of 3.5 to 1. It assumes that an all-new process plant will be constructed on site to process 150,000 tonnes per annum of ore for the recovery of an average of 66,000lbs Ta2O5 and 84,000 tonnes of feldspar concentrate per annum. On this basis, the study makes the following estimates for the project : * Capital cost: US$12.5million * Average annual revenues: US$ 8.1 million * * Average annual pre-tax operating profit: US$5.0 million (before interest) * Internal Rate of Return: 33% (* based on a recently published contract price of US$75/lb Ta2O5 in concentrates, and a price of US$37/tonne of feldspar concentrate). The Company is of the opinion that, whilst the scoping study is of necessity based on estimated figures for grade, tonnage, capital and operating costs, these already attractive project economics can be improved further as: 1. There is potential to increase the known tonnage of mineralisation. Mineralisation is open in all directions and there is the possibility that further drilling will increase available resources. 2. The grade of the mineralisation could be higher than initially indicated. The tantalum grade considered during the study, 289 g/t Ta2O5, is an average of the grades of surface channel samples and smaller samples from narrow diameter diamond drill holes. Drill samples may not be sufficiently large to be representative of grade as the larger surface channel samples average 436 g/t Ta2O5 and the largest sample taken to date, the metallurgical sample, had a grade of 620g/t Ta2O5. 3. The project is located adjacent to an existing feldspar production plant and considerable capital and operating costs savings are likely if plant and/or infrastructure can be shared. 4. The scoping study has not considered recovery of potentially valuable by-products quartz and mica. The study notes that the Rosendal project lies within an established mining area where pegmatites have been mined for more than 300 years, and mining operations are continuing. The area has a sparse population with the nearest house some 1.4km away. There are no special or protected natural habitats in this particular area nor or there any endangered species, historic sites, area of groundwater significance or areas of special landscape, topography or geomorphology. Given the Rosendal project's favourable coastal location, at the heart of European markets, and Finland's political stability, the Company intends to fast track the further evaluation and development of the Rosendal deposit, and plans further drilling next month. Further information: Patrick Cheetham, Executive Chairman, Tertiary Minerals plc. Tel: 01625-626203 Ron Marshman, City of London PR Ltd. Tel: 020-7628-5518
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