JOHANNESBURG (Reuters) - Finance Minister Pravin Gordhan said on Tuesday he was concerned about South Africa's volatile labour market, which has been plagued by strikes and above inflation wage demands despite a barely growing economy. Gordhan told a bankers conference that he was however happy that the situation seemed to be stabilising. Wage negotiations are taking place in the power, automotive and mining sectors, with initial demands ranging from 13 to 20 percent while inflation stands at 6.3 percent. (Reporting by Stella Mapenzauswa; Writing by Mfuneko Toyana; Editing by James Macharia)