심해저 망간단괴 개발사업의 경제적 타당성 재평가
An Economic Feasibility Study of Manganese Nodule in Korea Area: Clarion-Clipperton Fracture Zone
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Abstract
The purpose of this paper is to investigate economic feasibility of manganese nodules in the area obtained by Korea (Clarion-Clipperton Fracture Zone). We assumed that the production scale of manganese nodules were 3.0 MT (million ton(dry)) or 1.5 MT, and estimated the capital costs and operating costs by sectors such as exploration, mining, transportation, and metallurgical process. The capital cost and operating cost evaluation reflects the latest technical practices. First, for analyzing economic feasibility, the scenario suggests that the production of 4 metals can be made for 25 years. It is assumed that the discount rate, equity capital, and tax rate are each 8.0%, 50%, and 27%. 3.0 MT of manganese nodule were mined, economic feasibility analyses showed that IRR was 12.8 and pay-back period was 9.2 years, and when 1.5 MT of manganese nodule were mined, economic feasibility analyses showed that IRR was 4.0 and pay-back period was 11.8 years. This study shows that there exists economic feasibility when 3.0 MT of manganese are produced. In addition, we carried out a sensitivity analysis at the change of cobalt price on mining 1.5 MT. The result of sensitivity analysis shows that economic feasibility goes up as increase of cobalt price (50% up).
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