Yunnan Aluminium Co.Ltd(000807) : basic information of the company in the annual audit report of 2021 Yunnan Aluminium Co.Ltd(000807) (hereinafter referred to as “the company”) is a joint stock limited company established on March 20, 1998 by Yunnan Metallurgical Group Co., Ltd. (hereinafter referred to as “Yunnan Metallurgical Group”) with most of the production and operating assets of Yunnan Aluminum Plant, its former wholly-owned enterprise, as capital contribution, The registered address is Qidian street, Chenggong District, Kunming City, Yunnan Province, the people’s Republic of China, and the headquarters address is Qidian street, Chenggong District, Kunming City, Yunnan Province, the people’s Republic of China. Yunnan Metallurgical Group is the parent company of the company, and Aluminum Corporation Of China Limited(601600) Group Co., Ltd. (hereinafter referred to as “Chinalco group”) is the ultimate parent company of the company. As of December 31, 2021, the total share capital of the company was 3467957405 yuan, with a par value of 1 yuan per share. The total registered capital and shares of the company at the time of establishment were 310 million shares, of which Yunnan Metallurgical Group held 230 million shares, accounting for 74.19%; The public holds 80 million shares, accounting for 25.81%. 72 million A-Shares of the company were listed on Shenzhen Stock Exchange on April 8, 1998. The stock is abbreviated as ” Yunnan Aluminium Co.Ltd(000807) ” and the stock code is Yunnan Aluminium Co.Ltd(000807) . 54 million social public shares were issued on March 26, 2002, with a par value of 1 yuan per share; After the issuance, the total amount of shares was 364 million yuan, of which Yunnan Metallurgical Group held 230 million shares, accounting for 63.19%. In 2004, the capital reserve was converted into share capital, with 5 shares for every 10 shares; After the increase, the total shares were 546 million yuan, of which Yunnan Metallurgical Group held 345 million shares, accounting for 63.19%. The split share structure reform was carried out in 2006. Yunnan Metallurgical Group paid consideration of 64.32 million shares to the shareholders of circulating shares in the way of sending 3.2 shares per 10 shares. The shares held by Yunnan Metallurgical Group were changed to 280.68 million shares, accounting for 51.41%. On April 26, 2007, the capital reserve was converted into share capital, with 6 shares for every 10 shares; After the conversion, the total amount of shares was 873.6 million yuan. The par value of 254251 shares issued by the original institutional investors and other public investors on January 18, 2008 was 254251 shares; After the issuance, the total share capital was 916.13 million yuan. On May 6, 2008, the capital reserve was converted into share capital, with 1.5 shares added for every 10 shares; After the increase, the total share capital was changed to 105354 million yuan. On August 25, 2009, it issued 130434782 ordinary shares with a par value of 1 yuan per share to Yunnan Metallurgical Group and other specific objects; After the issuance, the total share capital was 1183979219 yuan. In 2011, the capital reserve was converted into share capital, with 3 shares for every 10 shares; After the increase, the total share capital was changed to 1539172984 yuan. On May 19, 2015, 359438661 ordinary shares with par value of 1 yuan per share were issued to Yunnan Metallurgical Group and other specific objects; After the issuance, the total share capital is 1898611645 yuan. On October 19, 2016, it issued 708227152 RMB ordinary shares with a par value of 1 yuan per share to Yunnan Metallurgical Group and other specific objects; After the issuance, the total share capital is 2606838797 yuan. On December 25, 2019, 521367759 ordinary shares with par value of 1 yuan each were issued to Aluminum Corporation Of China Limited(601600) (hereinafter referred to as “Chinalco shares”) and other specific objects; The total share capital after issuance is 3128206556 yuan. On December 3, 2021, 339750849 ordinary shares with par value of 1 yuan per share were issued to Chinalco and other specific objects; The total share capital after issuance is 3467957405 yuan Yunnan Aluminium Co.Ltd(000807) notes to financial statements for 2021 (unless otherwise specified, the monetary unit is RMB) – 12 – basic information of the company (Continued). Unless otherwise specified below, Yunnan Aluminium Co.Ltd(000807) and its subsidiaries are collectively referred to as ” Yunnan Aluminium Co.Ltd(000807) ” Yunnan Aluminium Co.Ltd(000807) mainly engaged in the processing and sales of remelting aluminum ingots and aluminum processing products, carbon and carbon products, alumina; Also engaged in non-ferrous metal products trade. There are 19 main subsidiaries included in the consolidation scope in this year. See note V for details. The financial statements were approved and issued by the board of directors of the company on March 21, 2022. II. Main accounting policies and accounting estimates Yunnan Aluminium Co.Ltd(000807) the specific accounting policies and accounting estimates are determined according to the characteristics of production and operation, which are mainly reflected in the measurement of expected credit loss of accounts receivable (note II (9)), net variability of inventories (note II (10)), useful life of fixed assets (note II (12)), amortization of intangible assets (note II (15)), impairment of long-term assets (note II (17)), measurement of estimated liabilities (note II (20)) Recognition of deferred income tax assets (note II (23)), etc Yunnan Aluminium Co.Ltd(000807) the key judgments, important accounting estimates and key assumptions used in determining important accounting policies are detailed in note II (26). (1) Preparation basis of financial statements the financial statements are prepared in accordance with the accounting standards for business enterprises – basic standards, various specific accounting standards and relevant provisions (hereinafter collectively referred to as “accounting standards for business enterprises”) issued by the Ministry of Finance on February 15, 2006 and beyond And the preparation of the disclosure provisions of the rules for the preparation of information disclosure of companies offering securities to the public No. 15 – General Provisions on financial reports issued by the China Securities Regulatory Commission