Study on Environmental Management Sustainability in the Deposition Area.Mineral mining is important sector which contributes significantly to the national and local government's revenue as well as for local community prosperity. Most mineral mining to the ore process isusing flotation process, which produces concentrate with tailing as waste products. Tailing is finely ground natural rock residue from the processing of mineralized ore which amount to approximately 96-97% of theprocessed ore and only 3-4% concentrate containing copper, gold and silver. Tailing should be managed properly to minimize environmental impact. The objective of this study is to identify the elements ofmineral mining environmental management system, to study existing environmental policy and to design sustainable model on the tailing handling. Case study was done in the Modified Ajkwa Deposition Area (Mod-ADA) at the Mimika Regency, Papua. This research was using soft system methodology (SSM) and policy development was using the total system intervention (TSD procedure which highlighted environmental care, complementarism and community development. The system modeling techniques used were Strategic Assumption Surfacing and Testing (SAST), Interpretative Structural Modeling (ISM) and Issue Management Technology (IMT) with Face validation by expert survey and FGD. Effective cost parameter and related SME business feasibility were calculated through field survey. The strategic policy model was formulated based on COMHAR sustainable development themes: satisfaction of human needs by the efficient use of resource, respect for ecological integrity and bio diversity, social equity and good decision making.This study resulted conceptual model which consists of the tailing management model (PET AS) for the physical environmental aspect and the Mod-ADA land rehabilitation (RELAW) for the biological aspect. The strategic policy model was developed according to environmental management and monitoring procedure (RKPL). The strategy should be strengthened by community empowerment and local environmental forum for stakeholder engagement. Based on the model formulation, the policy implicationis carried out through regional control of Informal Mining, community participation in the reclamation of deposition area activities and activities and optimalization of the CSR-fund with CSER guideline. The long term solution of Mod-ADA environmental management is tailing processing to increase added value such as cement industry. This plan should be supported by integrated EIA and environmental audit in line with the clean development mechanism (CDM) principles.