Firmansyah D, Agustawijaya DS, Murtiadi S. Optimisation of rock mass quality parameters for the initial geotechnical investigation of a vertical shaft: Gosowong Gold Mine Project Case Study - North Halmahera. rrijm [Internet]. 2023 Nov. 14 [cited 2025 Jan. 15];8(11):20-6. Available from: http://www.rrjournals.com/index.php/rrijm/article/view/918