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Minerals 2018, 8(10), 468;

Economic Block Model Development for Mining Seafloor Massive Sulfides

Department of Geoscience and Petroleum, Norwegian University of Science and Technology, Sem Sælands vei 1, N-7491 Trondheim, Norway
Author to whom correspondence should be addressed.
Received: 25 September 2018 / Revised: 11 October 2018 / Accepted: 16 October 2018 / Published: 19 October 2018
(This article belongs to the Special Issue Deep-Sea Minerals and Gas Hydrates)
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To support open-pit studies related to seafloor massive sulfides mining projects, an economic block-model is required. A modular framework is proposed to produce economic block models accommodating various levels of data. The framework is illustrated on a site of interest located on the Arctic Mid-Ocean Ridge. Random sampling based on literature datasets is performed to assign grades, porosity and grain density to the model. Other required parameters are produced using relationships found in the literature. Revenues are estimated using literature values within a net smelter return methodology. Mining costs are determined using the cost of a mining system and the estimated time required for excavating the ore. The excavating time is assessed through the specific energy for the ore and the mining machines. The specific energy is calculated with a hyperbaric rock-cutting model. An economic block value of each mining block is then provided. The mining block database resulting from the study constitutes a valuable input into further studies on resource development. The framework has also been used to support a sensitivity study. The availability of the marine assets has been found as having the greatest influence on the economic value of the study case. View Full-Text
Keywords: economic evaluation; seafloor massive sulfides; framework; specific energy; hyperbaric rock cutting; simulations; sensitivity study economic evaluation; seafloor massive sulfides; framework; specific energy; hyperbaric rock cutting; simulations; sensitivity study

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Lesage, M.; Juliani, C.; Ellefmo, S.L. Economic Block Model Development for Mining Seafloor Massive Sulfides. Minerals 2018, 8, 468.

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