[Translation] Ref. PDI/BK-02-013/2006 24 February 2006 To : President The Stock Exchange of Thailand Re: Clarification on the company's performance results in 2005 Enclosed are the copies of PDI's audited financial statements and consolidated financial statements for the year ended 31 December 2005 in both Thai and English version. From the company's statement of income on Equity Method, the company's revenues from sales was Bt6,138.5m which increased from year 2004 by Bt474.8m or a 8.4% increase. There was a net profit of Bt553.9m or an earning per share of 2.45 Baht as compared to a net profit of Bt221.6m or a net profit per share of 0.98 Baht in year 2004. From the company's consolidated statement of income, total revenues from sales was Bt6,150.7m which increased from the year 2004 by Bt476.9m or a 8.4% increase. There was a net profit of Bt561.3m or a net earning per share of 2.48 Baht as compared to a net profit of Bt217.0m or a net profit per share of 0.96 Baht in year 2004. Driven by a continuously rising LME zinc price, 2005 was another rebounding year for the company. The zinc price evolution surprised, particularly in the last quarter of the year and generated confusion and perturbations both on the supply and demand sides. It pushed the income of the company drastically upwards, even if the sale volume decrease by 10% and the locked-in forward price has somewhat limited the upside. Nevertheless, the positive impact on the income obliterated several negative factors that would otherwise have impacted the profitability of the company, namely the reduction of import duty of zinc to 5.5% and the steady increase of electricity and diesel prices. Please be informed accordingly. Yours truly, - Signature - (Mr. Surin Tanticharoenkiat) Board Secretary Board Secretary Division Tel. 0 2661 9900 Ext. 1402 Fax. 0 2661 9946 Page 1 of 1