Golden Century International Holdings Group Limited (0091.HK) operates as a multi-faceted investment holding company, with a primary focus on the exploration and extraction of coalbed methane (CBM) gas in both Hong Kong and mainland China. The Group's core CBM operations involve the full lifecycle of exploring, developing, and producing CBM across an extensive 425.628 square kilometer concession located in China's Anhui Province. It further supports the CBM industry by offering specialized technological services for gas development and utilization. Beyond its energy ventures, the company boasts a diverse portfolio, structured across several key segments: Electronic Components, a comprehensive Financial Business, Wealth Management, Proprietary Investment, and Comprehensive Healthcare. Its broader commercial activities encompass a range of financial offerings, including securities brokerage, money lending, and consultancy and referral services. The company also engages in the sale of electronic components. Furthermore, it provides various corporate and administrative solutions, such as secretarial, financing, and general corporate services, and is active in insurance brokerage and asset management. The company, which was previously known as International Standard Resources Holdings Limited, officially rebranded to Golden Century International Holdings Group Limited in March 2020. Its corporate headquarters are located in Causeway Bay, Hong Kong.