A famous old telluride deposit, formerly known as Offenbánya (Hungarian name). Operated until 2004.
Located near the small town of the same name.
Ref.: Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 923, 1015.