TAINAN, Taiwan, Dec 29 (Reuters) - Chipmaker Taiwan Semiconductor Manufacturing Company Ltd (TSMC)(2330.TW), began mass production of its most advanced chips in southern Taiwan on Thursday and the company's chairman said it would continue to expand capacity on the island.The long-awaited mass production of chips with 3-nanometre technology comes as attention focuses on the world's largest contract chipmaker's investment plans at home and abroad."TSMC is maintaining its technology leadership while investing significantly in Taiwan, continuing to invest and prosper with the environment," TSMC Chairman Mark Liu told a ceremony marking the production and capacity expansion in the southern city of Tainan.The Taiwanese company, which counts Apple Inc (AAPL.O) and Nvidia Corp (NVDA.O) among its major clients, is also building a chip plant in Japan and has said it was in the early stages of reviewing a potential expansion into Germany.Taiwan's government has dismissed concerns about a "goodbye to Taiwan" trend for the chip industry, saying the island's position as a major semiconductor producer and maker of the most advanced chips is secure."