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Abstract

Deep marine mineral deposits are mineral deposits that have been formed outside the continental slope. Currently three main types of deposits are generally recognized: polymetallic manganese nodules, massive seafloor sulfides and cobalt-rich crusts. The authors argue that marine mineral resource management must be holistic. Holistic marine mineral management requires a clear understanding of the objectives to be achieved through mining and to assess and ensure a proper balance between costs, risks, potential gains and losses. For decades there have been substantial uncertainties regarding the short- and long-term impact of deep-sea mining on international society and the economy and, more recently, environmental issues have become central to the debate over mining the deep seabed. If deep-sea mining is to play a constructive role in the green transition towards more environmentally robust energy production and e-mobility, more ambitious interdisciplinary research is needed to provide the knowledge needed to devise a holistic approach to management of marine minerals. This includes completing thorough baseline studies in conjunction with geological exploration and devising new means of handling financial and technological uncertainties when making investment decisions and when developing regulatory frameworks.

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... To address these challenges, Ellefmo et al. (2022) advocate a broad perspective on deep-sea mining and the overall management of mineral resources and the environment. They point out the The Green Stone Ageintroduction need for a holistic perspective where the mineral deposits on the ocean floor may play a future role in meeting the demand for metals and minerals to support the transition towards greener energy production and e-mobility. ...
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Manganese nodules occur as two-dimensional deposits in abyssal plains of all major oceans. In the Clarion-Clipperton Zone of the northeast equatorial Pacific alone, the amount of nodules is estimated to 21 billion tons indicating the huge potential of this deposit type. Apart from manganese, metals of economic interest are nickel, copper, and cobalt, but the nodules also contain interesting amounts of molybdenum, titanium, lithium, and the rare earth elements. Therefore they are also called as polymetallic nodules. The nodules consist of concentrically banded zones of micro-layers around a nucleus. They form by metal precipitation either from the ambient seawater (hydrogenetic) or from pore water in the sediments (diagenetic). They generally consist of a mixture of both genetic types but in varying proportions. Hydrogenetic precipitation leads to the enrichment of other metals than diagenetic precipitation (cobalt, rare earths versus nickel, copper, etc.), thus controlling the general chemical composition of the nodules. It seems that suboxic conditions (dissolved oxygen content is less than 5% of the saturation concentration) are generally necessary for diagenetic formation and oxic conditions for hydrogenetic formation. The change from oxic to suboxic conditions and vice versa is probably climatically controlled. Manganese nodules from the sediment surface are mainly composed of phyllomanganates such as vernadite, birnessite, and buserite, whereas amounts of todorokite seem to be negligible. Phyllomanganates contain their metals either as substitutes of manganese in octahedral layers or as hydrated cations in the interlayers. Well-studied occurrences of manganese nodules are known from the Clarion-Clipperton Zone in the NE equatorial Pacific, the Peru Basin in the SE Pacific, the Cook Island region in the SW Pacific, the central Indian Ocean Basin, and the Baltic Sea.
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Commercial-scale mining for polymetallic nodules could have a major impact on the deep-sea environment, but the effects of these mining activities on deep-sea ecosystems are very poorly known. The first commercial test mining for polymetallic nodules was carried out in 1970. Since then a number of small-scale commercial test mining or scientific disturbance studies have been carried out. Here we evaluate changes in faunal densities and diversity of benthic communities measured in response to these 11 simulated or test nodule mining disturbances using meta-analysis techniques. We find that impacts are often severe immediately after mining, with major negative changes in density and diversity of most groups occurring. However, in some cases, the mobile fauna and small-sized fauna experienced less negative impacts over the longer term. At seven sites in the Pacific, multiple surveys assessed recovery in fauna over periods of up to 26 years. Almost all studies show some recovery in faunal density and diversity for meiofauna and mobile megafauna, often within one year. However, very few faunal groups return to baseline or control conditions after two decades. The effects of polymetallic nodule mining are likely to be long term. Our analyses show considerable negative biological effects of seafloor nodule mining, even at the small scale of test mining experiments, although there is variation in sensitivity amongst organisms of different sizes and functional groups, which have important implications for ecosystem responses. Unfortunately, many past studies have limitations that reduce their effectiveness in determining responses. We provide recommendations to improve future mining impact test studies. Further research to assess the effects of test-mining activities will inform ways to improve mining practices and guide effective environmental management of mining activities.
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Marine phosphorites are known to concentrate rare earth elements and yttrium (REY) during early diagenetic formation. Much of the REY data available are decades old and incomplete, and there has not been a systematic study of REY distributions in marine phosphorite deposits that formed over a range of oceanic environments. Consequently, we initiated this study to determine if marine phosphorite deposits found in the global ocean host REY concentrations of high enough grade to be of economic interest. This paper addresses continental-margin (CM) and open-ocean seamount phosphorites. All 75 samples analyzed are composed predominantly of carbonate fluorapatite and minor detrital and authigenic minerals. CM phosphorites have low total REY contents (mean 161 ppm) and high heavy REY (HREY) complements (mean 49%), while seamount phosphorites have 4–6 times higher individual REY contents (except for Ce, which is subequal; mean ΣREY 727 ppm), and very high HREY complements (mean 60%). The predominant causes of higher concentrations and larger HREY complements in seamount phosphorites compared to CM phosphorites are age, changes in seawater REY concentrations over time, water depth of formation, changes in pH and complexing ligands, and differences in organic carbon content in the depositional environments. Potential ore deposits with high HREY complements, like the marine phosphorites analyzed here, could help supply the HREY needed for high-tech and green-tech applications without creating an oversupply of the LREY.
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Pacific) will impact one of the most remote and least known environments on Earth. Since vast areas are being targeted by concession holders for future mining, large-scale effects of these activities are expected. Hence, insight into the fauna associated with nodules is crucial to support effective environmental management. In this study video surveys were used to compare the epifauna from sites with contrasting nodule coverage in four license areas. Results showed that epifaunal densities are more than two times higher at dense nodule coverage (>25 versus ≤10 individuals per 100 m 2), and that taxa such as alcyonacean and antipatharian corals are virtually absent from nodule-free areas. Furthermore, surveys conducted along tracks from trawling or experimental mining simulations up to 37 years old, suggest that the removal of epifauna is almost complete and that its full recovery is slow. By highlighting the importance of nodules for the epifaunal biodiversity of this abyssal area, we urge for cautious consideration of the criteria for determining future preservation zones.
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Deep-ocean ferromanganese crusts and manganese nodules are important marine repositories for global metals. Interest in these minerals as potential resources has led to detailed sampling in many regions of the global ocean, allowing for updated estimates of their global extent. Here, we present global estimates of total tonnage as well as contained metal concentrations and tonnages for ferromanganese crusts and manganese nodules using the most extensive compilation of geochemical data collected to date, along with updated boundaries of regions of interest for these minerals. We present results from mean composition calculated in two ways: first, a global flat average of regional mean compositions, and second, a regionally weighted average that considers differences in chemistry among genetic types and/or oceanographic and geologic settings for these mineral occurrences. For nodules, we use the three genetic types: (1) hydrogenetic, typified by nodules from the West Pacific Nodule Field and Penrhyn Basin; (2) diagenetic, typified by nodules from the Peru Basin; (3) mixed hydrogenetic-diagenetic, typified by nodules from the Clarion–Clipperton Zone and the Central Indian Ocean Basin, and Atlantic Ocean regional type hydrogenetic nodules. All crusts considered here are of hydrogenetic origin, which we divide into seven regional types that reflect a combination of ocean basin and other source inputs. Crust types include Arctic Ocean, Atlantic Ocean, Indian Ocean, Continental Margin, Prime Crust Zone (PCZ), North Pacific (non PCZ), and South Pacific. Based on our areal estimates, we find that abyssal regions likely to contain hydrogenetic-type nodules are by far the most widespread in the global ocean (47% of total area), Atlantic Ocean (28%) are next, followed by mixed diagenetic-hydrogenetic (22%) and diagenetic (3%) types. For crusts, the Prime Crust Zone is the most extensive global region (27% of total area) followed by South Pacific (20%), Indian Ocean (18%), North Pacific (12%), Continental Margins (11%), Atlantic Ocean (10%), and Arctic Ocean (2%) types. The global total tonnage estimates that we calculated from this method are 21 × 10¹⁰ dry tons for manganese nodules, within the range of previous estimates, and 93 × 10¹⁰dry tons for ferromanganese crusts, which is 4.5 times higher than the 20 × 10¹⁰dry tons reported by Hein et al. (2003). This geology and oceanography driven approach to marine mineral quantification contrasts with estimates typically carried out for terrestrial mineral resource deposits. Nevertheless, these estimates and the data that support them demonstrate that marine minerals are an impressive repository for global metals.
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The International Seabed Authority (ISA) is an autonomous international organization established under the UN Convention on the Law of the Sea 1982 (UNCLOS) to organize and control the exploration for and exploitation of seabed mineral resources in areas beyond the limits of national jurisdiction. A system for exploration of mineral resources have been in existence for some time now and the ISA is currently in the midst of developing regulations for exploitation activities. Between 2014 and 2020, the ISA has made considerable progress in respect of the latter. However, with the COVID-19 pandemic, most of the work of the ISA, including the development of regulations for exploitation, have been on hiatus since March 2020. In late June 2021, the Republic of Nauru invoked a legal provision that essentially compels the ISA to accelerate the completion of the exploitation regulations. If the ISA fails to complete this within the prescribed time of two years, i.e. by July 2023, the ISA would have to consider and decide upon applications for mining contracts notwithstanding the absence of the exploitation regulations. Two years is not a long period, especially given that the COVID-19 pandemic continues to prevent member States from meeting in person at the ISA to continue negotiations on the exploitation regulations. Moreover, apart from having to resolve outstanding matters in relation to the exploitation regulations, the ISA would also need to address numerous other matters that intrinsically connect to the design of a functional system of exploitation. This paper reflects upon the key outstanding matters, both within and outside the exploitation regulations, which the ISA would need to urgently address and resolve within the two-year deadline.
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This article provides a critical evaluation of the International Seabed Authority’s (ISA) management of Deep Sea Mining (DSM) activities in the undersea area lying beyond sovereign territory. By juxtaposing the ISA’s nascent regulatory framework against one of the world’s most successful resource management regimes in Norway, we can clearly see how the ISA is unable to pursue the sort of strategic ownership that is necessary to secure the rents generated from these natural resources; rents which rightfully belong to the common heritage of mankind. In particular, we suggest that the ISA should: secure a better balance of institutional power across its policy, regulatory and operational roles; develop a more explicit policy for protecting the public’s interest (both current and future generations) as the owner of these resources; play a more active role in assembling and managing the access it allocates to these resources; and begin the discussion about how best to manage the wealth generated by these resources in a way that can ensure its just distribution.
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This Review focuses on whether the emerging industry of deep-seabed mining aligns with the sustainable development agenda. We cover motivations for deep-seabed mining, including to source metals for technology that assists with decarbonization, as well as governance issues surrounding the extraction of minerals. Questions of sustainability and ethics, including environmental, legal, social and rights-based challenges, are considered. Slowing the transition from exploration to exploitation and promoting a circular economy may have regulatory, technological and environmental benefits. This Review covers the sustainability of deep-seabed mining, suggesting a slower transition from exploration to exploitation may be beneficial.
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Copper, zinc, gold and silver mineralizations exist on the deep ocean floor, at great depths, on the Mid-Atlantic Ridge between Jan Mayen and Spitsbergen. None of these mineralizations within Norwegian jurisdiction have been thoroughly investigated yet, but they are likely to contain significant amounts of minerals and metals crucial to society and the ‘Green Shift’. Should these mineralizations, which contain minerals and metals that you and I use every day, be developed and mined? The question is premature: we need to know more before we can answer it. We need to know more about the formation, location and characteristics of these potential deposits, as well as the environmental, social and financial consequences of potential extraction. We need to evaluate mining alternatives and how to process the extracted ore. How should we answer this question? The ultimate decisions will be determined politically, and knowledge will be the defining factor. Knowledge gained from proper mineral resource management. Quantifying the Unknown sets out to estimate the amount of minerals and metals on the deep ocean floor along the Mid-Atlantic Ridge, in particular, copper, zinc, gold and silver contained in so-called ‘seafloor massive sulphide deposits’. These deposits are modern analogues of those mined worldwide on land today. The method used to quantify the amounts of these resources is known as ‘play analysis’. It shares aspects of methodologies used on land for similar purposes and has been employed extensively to assess untapped petroleum resources on the Norwegian Continental Shelf. Play analysis enables a quantification of the potential as well as associated uncertainty. The potential is large, but the uncertainty is also significant. Whether and how this potential is realized remains to be seen.
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This chapter describes the principal factors that govern fluid flow and pressure in sedimentary basins, how they can be measured and modelled and finally what role fluids play in conventional petroleum systems evaluation including generation, migration and entrapment of hydrocarbons. Fluid flow and in particular hydrocarbon movement are of great interest to the petroleum industry and therefore there is a vast body of literature. This chapter is therefore restricted to some key aspects dealing with the fundamentals of fluid flow in sedimentary basins and petroleum systems.
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Of late, there has been a rise in interest in deep-sea minerals such as manganese nodules. Commercial mining operations to extract such minerals may commence soon. However, deep-sea mining projects were already underway in the 1960s and in an advanced stage of development by the 1970s, only to be shelved again in the 1980s. This paper examines a half a century of history of deep-sea mining and discusses how changing political, legal, economic, and socio-cultural policy frameworks contributed to its rise, fall, and eventual rebirth. In doing so, it is shown that the path towards commercial mining is less straightforward or inevitable than it may seem to current proponents and critics of deep-sea mining. This paper also uses the case of manganese nodules to illustrate how mineral concentrations can gain, lose, and regain their status of a resource depending on social, political, legal, and economic factors. The “becoming” of resources is an open-ended, reversible and sometimes incomplete process.
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Norway has started ongoing initiatives related to deep sea mining. These include the evaluation of mineral resources within its sovereign territorial waters on the deep ocean floor of the Arctic region, i.e. the Mohns Ridge (71-73°N). Among the variety of possible seabed resources, seafloor massive sulfides (SMS) attract particular interest. Owing to the significant development potential and the general lack of knowledge of the SMS deposits, the present study aims at assessing mineral resources (i.e., Cu, Zn, Au and Ag) from a number of undiscovered sulfide deposits with the help of a revised model for mafic-hosted volcanogenic massive sulfide (VMS) deposits that adequately corresponds to geological settings of slow-spreading ridges. Application of the model requires a priori knowledge of the seafloor terrain to depict favorable geologic environments for the occurrence of SMS deposits. In such context, estimates are conducted for the easily accessible volcanically active parts of the ridge where 11 undiscovered deposits are expected. In these areas, total metal endowments are calculated to be on average 447,000 tonnes using a Monte Carlo simulation that combines the probabilistic estimates of number of undiscovered deposits with the grade and tonnage models. Estimates of in-place metal resources are generated in cumulative distribution form to present expected amount of undiscovered metals at 90% confidence intervals.
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Predictive geometallurgy tries to optimize the mineral value chain based on a precise and quantitative understanding of: The geology and mineralogy of the ores, the minerals processing, and the economics of mineral commodities. This chapter describes the state of the art and the mathematical building blocks of a pos- sible solution to this problem. This solution heavily relies on all classical fields of mathematical geosciences and geoinformatics, but requires new mathematical and computational developments. Geometallurgy can thus become a new defining chal- lenge for mathematical geosciences, in the same fashion as geostatistics has been in the first 50 years of the IAMG.
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With increasing demand for mineral resources, extraction of polymetallic sulphides at hydrothermal vents, cobalt-rich ferromanganese crusts at seamounts, and polymetallic nodules on abyssal plains may be imminent. Here, we shortly introduce ecosystem characteristics of mining areas, report on recent mining developments, and identify potential stress and disturbances created by mining. We analyze species’ potential resistance to future mining and perform meta-analyses on population density and diversity recovery after disturbances most similar to mining: volcanic eruptions at vents, fisheries on seamounts, and experiments that mimic nodule mining on abyssal plains. We report wide variation in recovery rates among taxa, size, and mobility of fauna. While densities and diversities of some taxa can recover to or even exceed pre-disturbance levels, community composition remains affected after decades. The loss of hard substrata or alteration of substrata composition may cause substantial community shifts that persist over geological timescales at mined sites.
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Research summary : T his article provides a review of real options theory ( ROT ) in strategic management research. We review the fundamentals of ROT and provide a taxonomy of this research. By synthesizing and critiquing research on real options, we identify a number of important challenges as well as opportunities for ROT if it is to enhance its impact on strategic management and potentially develop into a theoretical pillar in the field. We examine how ROT can inform the key tensions that managers face between commitment versus flexibility as well as between competition versus cooperation, and we show how it can uniquely address the fundamental issues in strategy. We conclude with suggestions on future research directions that could enhance and unify the thus‐far distinct main approaches to real options research . Managerial summary : R eal options theory ( ROT ) applies the heuristics and valuation models originally designed for financial securities to the domain of corporate investment decisions (e.g., joint ventures [ JV s], foreign direct investment, research and development [R&D], etc.) and strategic decision making under uncertainty. This article provides a synthesis of this body of research in strategic management and related disciplines. We suggest how ROT can address fundamental issues of strategy, including the dilemmas managers face between commitment versus flexibility as well as between competition versus cooperation. We discuss how three distinct approaches to real options analysis can complement each other, and we identify some of the main challenges and opportunities for ROT to become a theoretical pillar in strategy . Copyright © 2016 John Wiley & Sons, Ltd.
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Since 1939, the U.S. government, using the National Defense Stockpile (NDS), has been stockpiling critical strategic materials for national defense. The economic and national security environments, however, have changed significantly from the time the NDS was created. Current threats are more varied, production and processing of key materials is more globally dispersed, the global competition for raw materials is increasing, the U.S. military is more dependent on civilian industry, and industry depends far more on just-in-time inventory control. To help determine the significance of these changes for the strategic materials stockpile, the Department of Defense asked the NRC to assess the continuing need for and value of the NDS. This report begins with the historical context of the NDS. It then presents a discussion of raw-materials and minerals supply, an examination of changing defense planning and materials needs, an analysis of modern tools used to manage materials supply chains, and an assessment of current operational practices of the NDS. © 2008 by the National Academy of Sciences. All rights reserved.
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Deep-sea hydrothermal vent communities are characterized by complicated taxonomic, trophic, and spatial structure. Different animals consume chemosynthetic bacterial production to a variable extent and by different ways. Different animal groups demonstrate variable degree of adaptations to the extreme environment of hydrothermal vent systems. According to their ecological requirements, vent animal populations occupy different zones within the vent field. The boundaries of different vent fauna assemblages could be rather sharp or feebly marked appearing to be defined by gradients of water chemistry as well as the hydrodynamic regime within the vent field. To ensure the correct analyses of bioconcentration function (BCF) of vent organisms, such factors as taxonomic position, trophic specialization, patterns of physiology, ontogenetic stages, and spatial disposition of animal population within the vent field should be taken into consideration.
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Mineral resource management (MRM) practice has developed in South Africa over the course of the last ten years, with the purpose of integrating previously isolated technical functions into a value chain aligned, process organization, responsible for mine planning and optimization. The implementation of MRM within various companies has met with varying degrees of success, often resulting in incremental improvements in the planning process and, conversely, often becoming the scapegoat for poor delivery on plans and projects. The reason for this has been, amongst others, a lack of a suitable metric to define the success rate of MRM in the business at hand, in terms of its contribution to the bottom line. This paper is the result of extensive research by the author into this subject, which has resulted in the conclusion that economic value added is an appropriate measure that will lead to real optimization and value creation in mining companies, if applied within a new, holistic model
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On 20 August 1939 in the fuzzily demarcated no-man's land between Soviet-Protectorate Mongolia and Japanese-occupied Manchukuo (Manchuria) near Lake Buir Noir one of the most important but largely forgotten battles of the Second World War began with a morning bombardment by 200 Soviet bombers. After months of incursions by Japan's Kwantung Army, Stalin instructed his new commander in the east, Georgy Zhukov, to move over to the offensive. The battle would be a setpiece display of Soviet military-industrial modernity. Against the Japanese the Red Army amassed 581 aircraft, and 498 armoured vehicles, including a few prototypes of what would become the legendary T-34. Over 4,000 trucks moved 50,000 tons of supplies hundreds of miles to the front line; by contrast the Japanese had just 800 trucks in all of Manchuria. By the opening of the battle of Khalkhin Gol, the Soviets outnumbered the Japanese 2:1 in planes, tanks and artillery. After wrong-footing the Japanese with weeks of disinformation operations, two Soviet motorized pincers, covered by smothering tactical air support, swung around the Japanese northern and southern flanks, encircling and destroying the entire Kwantung's 6th Army. Foreshadowing the German Blitzkrieg, the Soviet attack taught the Japanese a humiliating lesson in the backwardness of their own army, which since 1937 had been engaged in a running battle with inferior Chinese forces. Nomonhan, as the Japanese called it, was only the opening trailer. Six years later, in the spring of 1945 as he prepared the last assault on Berlin, Zhukov would array 7,500 combat aircraft, 14,600 guns, 3,155 tanks and self-propelled guns, and over 1,500 rocket launchers. As the victor in the most intensive land conflict the world had ever seen, the Soviet Union between 1941 and 1945 equipped its forces with over 100,000 tanks, 130,000 aircraft, 800,000 guns and mortars, 1 billion shells and bombs, and 40 billion small arms cartridges.