THAI SMELTER FACES TIN CONCENTRATE SUPPLY SHORTAGE Thailand's major tin exporter and producer <Thailand Smelting and Refining Co> (Thaisarco) said it may be unable to meet all its overseas orders because of insufficient supplies of tin concentrates from Thai mines. Local mines cut combined daily tin concentrate sales to Thaisarco, a Royal Dutch/Shell Group <RD.AS> unit, to less than 20 tonnes earlier this month from a previous 40 to 45 tonne average, commercial manager Yoot Eamsa-ard told Reuters. He said the cuts resulted from a government decision to let the temporary business and municipal tax reductions on exported tin lapse on June 3. The taxes, levied on the tin mines, rose to 4.4 pct this month from 1.1 pct ad valorem over the past year. The lower levels had been introduced last year as a temporary move to aid the tin industry after prices collapsed in late 1985. Yoot said Thaisarco had to dig into its stocks to meet a large portion of new overseas orders which were averaging 100 tonnes per day. As a result, he said, Thailand could fail to fill some 3,000 tonnes of its 19,000 tonne tin export quota allocated by the Association of Tin Producing Countries (ATPC) for the year ending February 1988. Reduced tin exports this year could cause the ATPC to allocate a lower quota next year, Yoot said. The supplies shortage should prove temporary, however, because the Thai cabinet is expected to review a Mineral Resources Department proposal to reinstate the low taxes late this month, Yoot said. The department said Thailand exported 7,715 tonnes of tin during January/May compared with 8,462 tonnes a year ago.