Page 1 of 2 Ref. PDI/BK-BS-012/2018 23 rd February 2018 To: President The Stock Exchange of Thailand Re: Clarification on Company’s performance of the 4th Quarter and Full Year 2017 For the forth

Page 1 of 2 Ref. PDI/BK-BS-063/2017 7 th November 2017 To: President The Stock Exchange of Thailand Re: Clarification on Company’s performance of the 3 rd Quarter and 9- month Year to date 2017 For

Page 1 of 2 Ref. PDI/BK-BS-41/2018 11 th May 2018 To: President The Stock Exchange of Thailand Re: Clarification on Company’s performance of the 1 st Quarter 2018 For the first quarter of 2018

Ref. PDI/BK-BS-011/2019 25th February 2019 Re: Management Discussion and Analysis (MD&A) For the year ended December 31, 2018 To: President The Stock Exchange of Thailand Due to depletion of Mae Sod

Ref. PDI/BK-BS-056/2018 8th August 2018 Re: Management Discussion and Analysis (MD&A) For the 2Q 2018 and 1H 2018 To: President The Stock Exchange of Thailand Due to depletion of Mae Sod Mine’s

Ref. PDI/BK-BS-076/2018 7th November 2018 Re: Management Discussion and Analysis (MD&A) For the three-month and nine-month periods ended September 30, 2018 To: President The Stock Exchange of

[Translation] Page 1 of 2 Ref. PDI/BK-BS-048/2017 18 August 2017 To : President The Stock Exchange of Thailand Re. : Invest in Short Bill of Exchange in Thai Baht currency with specified the

Limited and its subsidiaries Ref. PDI/BK-BS-022/2020 May 12, 2020 Re: Management Discussion and Analysis (MD&A) For the three-month period ended March 31, 2020 To: President The Stock Exchange of Thailand

[Translation] Page 1 of 2 Ref. PDI/BK-BS-044/2017 8 August 2017 To : President The Stock Exchange of Thailand Re. : Resolutions of the Board of Directors’ Meeting, No. 03-2017 The Board of Directors

Page 1 of 2 Ref. PDI/BK-BS-43/2017 08 th August 2017 To: President The Stock Exchange of Thailand Re: Clarification on Company’s performance of the 2 nd Quarter and 1 st Half 2017 For the second