ONG SIMPHYE CO., LTD. Registered No. 0105494000680 Province Phuket Registration date January 19, 1950
THE PRUYAI SAMKONG TIN MINE COMPANY LIMITED Registered No. 0105492001093 Province Phuket Registration date November 11, 1949
เหมืองแร่ส้มมะนาวตะกั่วป่า จำกัด Registered No. 0105492001077 Province Phuket Registration date October 27, 1949
JOOTEE TIN DREDGING COMPANY LIMITED Registered No. 0105492000763 Province Phuket Registration date July 13, 1949
THE THAI MINING NAPRASERD CO., LTD. Registered No. 0835491000011 Province Phuket Registration date January 16, 1948
THE OBHARS TIN MINE CO.,LTD. Registered No. 0105489000839 Province Phuket Registration date September 18, 1946
หลวงประเทศและบุตร จำกัด Registered No. 0105484000300 Province Phuket Registration date September 19, 1941