Yoyok Hartoyo

Yoyok Hartoyo is a Drilling Supervisor at PT Bukit Asam Tbk since October 2023, bringing a wealth of experience from prior roles including Junior Geologist at PT. Semen Baturaja (Persero) and Management Trainee in Mining Engineering. Previous positions include participation in the Officer Development Program at PT. BANK NEGARA INDONESIA (Persero) Tbk., and contributions as an Assistant Lecturer at both Universitas Gadjah Mada and the Indonesian Earth Science Olympiad Team. Yoyok's academic background features a Bachelor of Engineering in Geological/Geophysical Engineering from Universitas Gadjah Mada, completed in 2018, along with hands-on internship experience in mineral resource evaluation and geological mapping.