About AC
AC Precious Metals Refinery Ltd.
AC Precious Metals Refinery Ltd. specialises in the refining of precious metals and is committed to providing high-quality precious metal products with outstanding value. Together with partners possessing extensive experience in gold trading, we strive to strengthen the local refining industry and position it within the international market.





Vision
To be a trusted leader in precious metals refining,
trading, and digital innovation.
Mission
To be recognised as one of Hong Kong’s most trusted precious metals refineries.
A premier trading platform committed to the highest standards of transparency, integrity, and fairness throughout the entire transaction process.
To achieve the highest level of client satisfaction.
To provide our clients with bespoke products of the highest prestige and quality.
To advance sustainability and social responsibility through strong corporate governance.
Company Structure
Management Level
Mr. CHENG, Kam Chiu Stewart
Chairman and Co-Founder
Mr. CHENG, Kam Chiu Stewart has served as Chairman of New Times Energy Corporation Limited since 2009. He is an established business executive, entrepreneur and business owner with over 40 years of worldwide executive management experience in major public companies. Mr. Cheng possesses strong entrepreneurial vision, proven strategic planning capability, and cross-disciplinary expertise across engineering, corporate management and business leadership, with extensive experience in the property development, precious metals, energy, investment and education sectors. He is also recognised for his philanthropic commitment and contribution to the community.
Mr. Cheng holds a Bachelor’s degree in Civil and Environmental Engineering from the University of Wisconsin–Madison, a Master’s degree in Civil Engineering from the University of California, Berkeley, and a Master’s degree in Business Administration from The Chinese University of Hong Kong. In 2023, he was awarded the 21st Honorary Fellowship by The Chinese University of Hong Kong. He is a professional engineer, a member of The Hong Kong Institution of Engineers, and also serves as a board member of The Chinese University of Hong Kong.
Mr. TANG, John Wing Yan
Executive Director
Mr. TANG, John Wing Yan was appointed as an Executive Director of New Times Corporation Limited in June 2017, after joining the Group in August 2015 as General Manager. Mr. Tang has 30 years of entrepreneurial, senior corporate management and strategic leadership experience, with extensive international business and management exposure spanning North America, Hong Kong, China, Asia, South America and Australia. Prior to joining the Group, he held senior executive positions with international corporations.
Mr. Tang is professionally trained as a structural engineer and was formerly admitted as a Chartered Engineer in the United Kingdom, and as a Registered Professional Engineer in the United States and Canada. He possesses a cross-disciplinary skill set spanning engineering, finance, corporate management and strategic planning. He has also authored and co-authored peer-reviewed technical publications and is the holder of U.S. Patent No. US6329589 in relation to the wireless transmission of solar power for exterior curtain wall systems in buildings.
Mr. Tang holds degrees in civil engineering, engineering and financial engineering from the University of Massachusetts, the University of California, Berkeley and Stanford University, respectively.
Mr. CHEUNG, Stanley
Mr. Stanley Cheung graduated from McGill University Montreal Canada with Bachelor of Commerce (Major in Management Information System) in his early years. Mr. Stanley Cheung has over 40 years’ experience in banking, finance, securities and futures brokering as well as forex dealing. He worked for Samuel Montagu & Company, once one of the world’s top bullion brokerage businesses and subsequently served as Executive Director of Simsen International Corp. Ltd. During the 1990s he set up the first ever Chinese finance news and data satellite system which covered the whole of mainland China. In addition, he has taken up key roles in social services activities, including Vice Chairman of Hong Kong Precious Metals Traders Association, Member of Kwai Chung & Princess Margaret Hospital Governing Committee, Member of The Community Chest General Donations/Special Events Organising Committee and Member of CPPCC, Luohu, Shenzhen. He also served as Vice Chairman of the Pok Oi Hospital, Director of the Hong Kong Securities Association Limited, and others.
Ms. SUN, Erica
Assistant Financial Controller
Ms. Erica Sun joined New Times Corporation Limited in August 2025 as Assistant Financial Controller. She is a distinguished finance executive with more than two decades of strategic financial leadership across Fortune 150 multinational corporations, Chinese state-owned enterprises, and Hong Kong-listed conglomerates.
Ms. Sun holds a Master of Laws (LLM) and a Bachelor of Arts (Hons) in Accountancy. She is also a Fellow Member of both the Hong Kong Institute of Certified Public Accountants (FCPA) and the Association of Chartered Certified Accountants (FCCA).
Prior to joining the Group, Ms. Sun has demonstrated her expertise in strategic business partnership, corporate restructuring and financing, mergers and acquisitions, tax optimization strategies and enterprise resource planning management. Her proven ability to drive financial transformation while maintaining regulatory compliance in achieving operational excellence brings a truly global perspective to financial leadership and corporate governance for the company.
Mr. LEE, Stephen
Senior Consultant
Mr. Stephen Lee joined AC Precious Metals Refinery Limited in June 2021 as Chief Operating Officer and has served as Consultant to the Company since February 2026. He continues to provide valuable counsel to the Company by drawing on his extensive industry experience, technical knowledge and operational expertise, thereby supporting the Company’s ongoing strategic development.
Mr. Lee possesses over 40 years of experience in the precious metals industry and has developed deep expertise in precious metals trading and refinery operations through his work with both local and international refineries. He received professional training in the early stage of his career at a well-established refinery in Italy, which laid the foundation for his long and distinguished service in the industry.
Throughout his career, Mr. Lee has made significant contributions to the development of the precious metals sector. In 2000, he assisted China Cooperative Gold Mine by providing technical know-how and industry expertise, and played a key role in its successful qualification as one of the first batch of approved physical gold deliverers of the Shanghai Gold Exchange.
Mr. Lee also served as a member of the Executive and Supervisory Committee of The Chinese Gold and Silver Exchange Society for its 43rd, 44th and 45th terms.