Analisis penurunan kadar sianida menggunakan metode passive treatment pada limbah tailing tambang emas studi kasus pt antam persero tbk ubpe pongkor = Cyanide reduction analysis using passive treatment method from gold mine tailing waste case study pt antam persero tbk ubpe pongkor / Alfi Syafira - Alfi Syafira, author (Fakultas Teknik Universitas Indonesia, 2015)