Patiung, Obed, and Mapuay Menasye Theo Afasedanya. “Investment Feasibility Of A Sand And Gravel Quarry Using The Benefit Cost Ratio Method A Case Study Of Pt. Arkatama Mining, Jayawijaya Regency, Indonesia”. MULTITEK INDONESIA : JURNAL ILMIAH 19, no. 2 (January 2, 2026): 193–199. Accessed May 29, 2026. http://journal.umpo.ac.id/index.php/multitek/article/view/12726.