istighfara, vedelya and Dermiyati, - and Rinawati, Rinawati and Prasetia, Hendra and Fasya, Muhammad Riski Firdaus Heavy metals in water and sediment of Way Ratai River due to small-scale gold mining activities in Pesawaran Regency, Lampung Province (Part I: mercury, cyanide, lead, and arsenic). JOURNAL OF DEGRADED AND MINING LANDS MANAGEMENT.