Zúñiga Arrobo, C. and Rojas Villacís, C. 2020. Analysis of operating costs in small-scale mining and artisanal mining in Nambija. FIGEMPA: Investigación y Desarrollo. 10, 2 (Dec. 2020), 50–60. DOI:https://doi.org/10.29166/revfig.v1i2.2568.