Thanga Surangam (transl. Gold Mine) is a 1969 Indian Tamil-language film, directed by T. R. Ramanna and produced by E. V. Rajan.^[1] The film stars Sivaji Ganesan, Bharathi and Vennira Aadai Nirmala. It was released on 28 March 1969,^[2] and emerged a major success.^[3]

This article needs an improved plot summary. (September 2021)

While escaping Burma during WWII, Kamakshi gives her son Rajan to a priest Arockiyasamy to get him to safety. They reunite years later in India when Rajan is a C.B.I officer out to catch a gang that's making counterfeit gold. Scientist Subbaiya was attempting to manufacture actual gold but accidentally created a highly realistic counterfeit. The leader of the gang, Mr. Spy has amassed great wealth with this counterfeit and is holding Subbaiya hostage to create more. Rajan tries to learn more by interrogating Amutha, Subbaiya's daughter. Mr. Spy, aware of Rajan's attempts, sends several spies to get closer to him and derail his investigation. As Rajan grows closer to catching the gang, he learns shocking truths that his Father is MR.Spy Fire shots Exchanged between two And he successfully Arrest MR.SPY And He is given Gold Medal

Some scenes were shot at the Madras Race Course.^[4]

The music was composed by T. K. Ramamoorthy with lyrics by Kannadasan.^[5]