Minerals Report - International Seabed Authority

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It has been assumed that the structure of the gas hydrate layer is simple - that its thickness should gradually increase on moving to deeper water because gas hydrate becomes stable at higher pressure-temperature conditions. This assumes that (i) pressure is simply a function of total depth from the sea surface to a position in the sediments, and (ii) the chemistry of the pore waters and the thermal gradient are fairly uniform 29 . 3.3. Formation of Methane Hydrates After generation of methane, its transportation in sediment can be through various means such as movement of pore-water containing dissolved gas, free gas flow, and molecular diffusion. When the ascending methane molecules reach favourable subsurface-thermobaric conditions (i.e. hydrate stability zone) then, formation of hydrate takes place within the pore spaces of the sediments in the presence of water molecules. It can thus be seen that biogenic methane formation may take place both in situ within the hydrate stability zone (HSZ) and beneath it. Thermogenic methane on the other hand has to move upwards from depth into the HSZ. Scientists use various geochemical and isotopic techniques to identify the origin of methane in hydrate samples. After precipitation hydrate progressively fills the sediment pore-spaces and fractures, and eventually cements them to give rise to massive and vein type hydrate deposits 30 . It may be noted that the temperature and pressure conditions for hydrate stability depend on the composition of the gas and on the presence of salts and other components in seawater. It is generally believed that pore water has to be fully saturated with methane before natural hydrate can form. The condition of sufficiently high pore water methane concentration can 31 be met by i) supply of sufficiently large amounts of organic matter in the sediments to generate enhanced methanogenic decomposition; ii) large upward methane fluxes mostly related to fault zones, or other conduits such as diapirs, mud volcanism etc. 3.4. Free gas below hydrates In the context of methane hydrate deposits, often free gas is mentioned. This free gas refers to methane molecules that exist as gas, which are neither bound to other molecules (for instance, to form a complex hydrocarbon) nor trapped within a hydrate. More commonly, INTERNATIONAL SEABED AUTHORITY 526
free methane in a geologic formation exists within the pores of low-density rocks. Any hydrate layer may trap free methane as long as the layer forms a seal through which gas cannot migrate. The free methane may be thermogenic gas that has migrated upwards from the earth's crust, or it may be biogenic gas that was previously a hydrate layer but has now melted. Dillon et al. 4 suggested several different types of formations of gas hydrates that can trap free methane (Figure 5). GHL: Gas hydrate cemented layer; PGT: Possible Gas trap Figure 5: Schematic diagram of geological situations in which a gas hydrate cemented layer can act as a seal trapping free gas (adapted after Dillon et al. 4 ; Kvenvolden 2 ). 4. Indicators of Gas Hydrates in Sediments The presence of gas hydrates within sediments is manifested in various ways. The most common is through acoustically derived geophysical data. This remotely sensed data needs to be verified by ground-truth validation of actual occurrence. Similarly, non-geophysical proxies can also provide some indication of the occurrences of gas hydrate. 4.1. Geophysical indicators Although gas hydrates have been recognized in drilled cores, their presence over large areas can be detected much more efficiently by acoustical methods, using seismic reflection profiles (Dillon et al., 4 and references therein). The most commonly used acoustic signature for INTERNATIONAL SEABED AUTHORITY 527
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Workshop on Minerals Other than Pol
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Published in Jamaica 2004 by the In
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Chapter 6* Impact of the Developmen
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PART 4 REGULATORY AND PROMOTIONAL F
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The Authority designates one of two
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deposits and gas hydrates of the co
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Prof. Chris German, Challenger Divi
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Mr. Sven Petersen, Research Associa
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SECRETARIAT Ambassador Satya N. Nan
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is to submit “an application that
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that was established to help protec
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on the continental margin. He state
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with the German firm Preussag. As p
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metre or metres of these black smok
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nodules in terms of these metals -
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Professor Herzig stressed however t
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While noting that the continuity of
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asal diameter at 1,600 m water dept
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discovery of the new hydrothermal s
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esearch cruises dedicated to ferrom
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global mid-ocean ridge system. He p
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athymetric map of the seafloor. A s
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were encouraging. In the course of
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that this matter was sensitive, he
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complete a preliminary evaluation o
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metals - nickel, cobalt, manganese,
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12. Issues to be taken into account
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entities. Many of them included min
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In this regard, the Secretary-Gener
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According to Dr. Vysotsky, as estim
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With regard to current knowledge ab
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Dr. Corbett gave a brief account of
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River resulting in the introduction
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Ms. Zaamwani pointed out that as th
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geochemical and geotechnical survey
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of its continental shelf through bi
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also stated, is similar to that of
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Chapter 7 Technical requirements fo
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Table 1: Classification of marine m
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Volcanogenic Metalliferous sediment
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deposits, including massive sulphid
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3. Marine Minerals Related to Deep
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The black smoker chimneys dischargi
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contain metals are present at discr
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Figure 4. A diagrammatic east-west
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and refining of these crusts is mor
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distances of hundreds of kilometres
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2) Deep ocean hot springs at massiv
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6. P.A. Rona, M.D. Hannington, C.V.
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25. M.J. Cruickshank (1998), Law of
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With regard to marine mineral depos
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Focussing on sites of sea floor min
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scientific journal "Nature". The su
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Professor Rona recalled that the in
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like St. Stephen’s in the Kremlin
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He noted that another product of ho
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The reasons why the Red Sea deposit
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a number of geothermal wells have b
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1. Introduction The discovery of hi
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0° 30° 30° 60° Explorer Ridge C
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3. Hydrothermal Convection At ocean
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Due to its increased buoyancy at hi
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5. Metal Contents Despite moderate
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(11.8 wt.%), and have high concentr
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Table 3: Size and Tonnage - Atlanti
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Local enrichment of more than 40 pp
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the Red Sea, Middle Valley, Explore
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Table 8: Advantages of Seafloor Mas
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60 kg Au) located on the neighbouri
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9. Perspective If further explorati
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3. J.M. Franklin, J.W. Lydon, and D
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19. R.A. Zierenberg, Y. Fouquet, D.
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35. J. Collier, M. Sinha (1990), Se
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53. P.M. Herzig, Y. Fouquet, M.D. H
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68. M.D. Hannington, J.M. Peter, an
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85. The New York Times (1997), Firs
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southern segment is a fast-spreadin
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Professor Herzig said that the spec
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Professor Herzig said that the depo
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Professor Herzig informed participa
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he informed participants that in ad
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In relation to Conical Seamount, Pr
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deposits is essential to reliably a
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would be removed from the deposit.
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CHAPTER 3 REGIONAL AND LOCAL VARIAB
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� Metallogenic provinces that are
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A digital map of ore-bearing region
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of the slopes in between 1500-3000m
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development there are areas with ma
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Regarding the formation of the firs
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SUMMARY OF THE PRESENTATION AND DIS
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the Juan-de-Fuca Ridge, the Guaymas
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Intensive investigations resulted i
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Based on the potential resources co
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It should be noted that other massi
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Generally, the massive sulphides or
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With regard to the gold values repo
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CHAPTER 5 COBALT-RICH FERROMANGANES
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Current patterns, topography, botto
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Table 1: Contents of manganese, iro
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INTERNATIONAL SEABED AUTHORITY 194
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Depth (km) 0 100 200 0 1 2 3 4 5 O
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sediment. Those thinly veiled crust
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Table 3: Cruises dedicated to the s
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today. Field studies by the USA, Ge
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Phosphorite and fresh basalt are st
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3.2. Mineralogy The mineralogy of b
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Samples 25 20 15 10 5 0 Growth Rate
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3.4. Chemical Composition All USGS
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elements associated with the detrit
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Sample/PAAS 100 10 1 0.1 0.01 0.001
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Phosphatization of the older Fe-Mn
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A. B. C. Mn FSM-Palau Marshall Isla
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4. Iron-Manganese Crust Formation E
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5. Biological Communities and Curre
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6. Resource, Technology and Economi
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MAJOR DIMENSIONS Length : 13 m Widt
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not economical, under the circumsta
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Based on grade, tonnage, and oceano
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3. J.R. Hein and C.L. Morgan (1999)
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deep sea deposits, Report on the Sc
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29. T. Moritani and S. Nakao (eds.)
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Angeles, CA, International Society
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geochemistry of Central Pacific fer
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73. J.W. Moffett (1990), Microbiall
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86. D. Puteanus and P. Halbach (54)
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110. A Koschinsky and P Halbach (46
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132. J.R. Hein et al. (1) 133. H.H.
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B. 14°30'N 14°20'N 14°10'N 160°
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Appendix 4. 1-m-diameter circular c
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economic potential in hydrogenetic
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Zealand Oceanographic Institute, th
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depths. Up welling increases primar
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een recovered is 25 cm. He also sai
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shallower than 1500 metres, a shall
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In relation to mining technology, o
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On the most promising sites for cru
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In addition to the International Se
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1. Introduction Plant life is impos
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Table 1 Potential microbial metabol
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Figure 2 Simplified representation
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Figure 3 Major components of a gene
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the mussel's nutrition. When experi
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Reasons for this do not appear to b
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egions, one study pointed out that
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very widespread, supporting microbi
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Studies of the rapid colonisation o
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y mining, which is expected to be v
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2. J. B. Corliss, J. Dymond, L. Gor
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19. V. Tunnicliffe, A.G. McArthur a
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together with mucus that is secrete
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close to neutral ph conditions, it
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France, Germany, the United Kingdom
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of the sedimentary column, whereas
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Table 2: Research Submersibles and
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4. Technical Requirements For resea
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5. Processing Technologies The phys
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grow on substrate rocks because of
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5. M.D. Hannington, A.G. Galley, P.
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Dr. Herzig informed participants th
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search for sites of hydrothermal ve
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with such a grab. In addition to th
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Remotely operated vehicles (ROVs) D
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equired to make sure that the ship
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Dr. Herzig summarized the technical
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commercial. Since confidentiality o
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CHAPTER 8 FACTORS IN FINANCING EXPL
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The traditional project stages that
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there is a subset that forms in spe
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of competing for the attention of i
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7. Why SMS Mines will be Lower Cost
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8. Modelling SMS mining offers scop
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Because exhalative SMS deposits are
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flow to the metal markets. He also
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shortage in the next couple of year
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starts, the operation could take pl
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Based on this and other considerati
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Mr. Malnic said that the mining ope
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and silver. Except for volcanically
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2.2. Major Features of the Draft Of
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As a general principle the fiscal p
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I think the issue is not as simple
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Table 3: Data and information requi
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former case a reminder notice is se
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6. Elisabeth Mann Borgese, Ocean Go
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longer an area is held, more inform
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from the deep sea. One group of enz
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CHAPTER 10 NATIONAL AND INTERNATION
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times greater than atmospheric pres
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Fig. 2 Schematic diagram showing th
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Figure. 4: Distributions of hydroth
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Figure 6: Distributions of hydrothe
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Figure.8: Plot of incidence of hydr
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et al., 1998) - one of the two very
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seabed but, instead, are dispersed
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Figure 10: The Southampton Oceanogr
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oxide material, polymetallic sulphi
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Figure 13: TOBI sidescan sonar imag
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ACKNOWLEDGEMENTS I would like to ex
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15. Cronan D S (ed.) Handbook of Ma
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33. Gross G.A. and McLeod C.R., Met
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51. Jones H. A. and Davies P. J., P
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69. Manheim F. T., Composition and
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87. Muller, R.D., Roest, W.R., Roye
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107. Warren, J., Evaporites: their
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cultivating sulphide oxidising bact
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In relation to spreading rates at v
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coordination to actually get to go
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esources and to know whether or not
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ROVS, AUVs or submersibles to produ
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have oversimplified the case in his
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CHAPTER 11 A COMPARISON OF THE POSS
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This paper proposes to compare the
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• The distance between the mining
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economic value. Phosphatisation has
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The morphology of the mineral edifi
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Table 3: Geochemistry of known mass
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Detailed exploration has not been c
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flotation, can separate the ferroma
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The crushed and ground ore can be c
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3.2. Assumptions made for each kind
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alloys or even manganese ore in the
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ought the nickel price to a top. Th
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Because the metal market economy is
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14. J. -P. Lenoble (1992), Future d
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31. J. Francheteau, D. Needham, P.
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48. J. -P. Lenoble (1996), Les nodu
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66. J. -J. Prédali and J. -P. Polg
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classification system, Mr. Lenoble
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To recapitulate the sizes and possi
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proposed processing technologies an
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international community is only jus
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Part 2 ISSUES TO BE TAKEN INTO ACCO
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The Secretary-General said that the
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Mr. Nandan pointed out that the nex
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problems would resurface, because i
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prospecting would be more applicabl
Page 484 and 485: dimensional seafloor massive sulphi
Page 486 and 487: workshop, in relation to deposit ev
Page 488 and 489: an economic perspective, including
Page 490 and 491: sulphides and cobalt-rich ferromang
Page 492 and 493: CHAPTER 13 PETROLEUM POTENTIAL AND
Page 494 and 495: structure and filled with sediments
Page 496 and 497: Basin groups are subdivided into ty
Page 498 and 499: during the late Mesozoic-Cenozoic s
Page 500 and 501: Figure 4: Volume density of initial
Page 502 and 503: ITIPRHC = Vnr φHC γ 103 (Mmtoe),
Page 504 and 505: Table 1: Offshore (deepwater) initi
Page 506 and 507: Speaking about particular geographi
Page 508 and 509: World Ocean, including areas off no
Page 510 and 511: Table 4: Largest oil and gas discov
Page 512 and 513: The extremely harsh environment bro
Page 514 and 515: In other regions of the world, enco
Page 516 and 517: REFERENCES 1. L.G. Weeks (1971), Ma
Page 518 and 519: SUMMARY OF PRESENTATION AND DISCUSS
Page 520 and 521: Dr. Vysotsky said that estimates of
Page 522 and 523: In Southeast Asia, Dr. Vysotsky spo
Page 524 and 525: Philippines, and possibly Brazil. W
Page 526 and 527: and we shall encounter severe deple
Page 528 and 529: In the 1960's scientists discovered
Page 530 and 531: Figure 2. Worldwide locations of kn
Page 532 and 533: methane by bacteria in an anoxic en
Page 536 and 537: identification of gas hydrate in ma
Page 538 and 539: ottom simulating reflections (BSR)
Page 540 and 541: Figure 6: Interpretative plot of hy
Page 542 and 543: floor have indicated the presence o
Page 544 and 545: of free gas below the BSR is usuall
Page 546 and 547: sediment and to provide an indicati
Page 548 and 549: 6. Harvesting methane hydrates -Som
Page 550 and 551: deposits can be commercial, even in
Page 552 and 553: at a catastrophic scale. Some of th
Page 554 and 555: Figure 8. Development of hydrate re
Page 556 and 557: This is perhaps due to the percepti
Page 558 and 559: would provide Japan with methane fo
Page 560 and 561: NOTES AND REFERENCES 1. E.D. Sloan
Page 562 and 563: 20. R.F. Meyer (1981), Speculation
Page 564 and 565: Master Workshop on Gas Hydrates: Re
Page 566 and 567: 60. M.D. Max and M.J. Cruickshank (
Page 568 and 569: is that their exploitation might re
Page 570 and 571: further pointed out that even if on
Page 572 and 573: Dr. Desa also informed participants
Page 574 and 575: thickness of the sediments, the thi
Page 576 and 577: pressure at sea level leads to hydr
Page 578 and 579: aware of any studies of natural ear
Page 580 and 581: CHAPTER 15 A CASE STUDY IN THE DEVE
Page 582 and 583: NAMIBIA L W OR CT BOTSWANA SOUTH AF
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The Orange River, one of Africa’s
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formation of a large accretion coar
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The deep-water ore body more closel
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4. The mineral resource management
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deployed on a MacArtney FOCUS 400 R
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Utilising Jago has made very detail
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Although at first glance the nature
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to levels capable of sustaining sea
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In accordance with De Beers’ over
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ACKNOWLEDGEMENTS I thank my many co
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16. I.B. Corbett (1989), The sedime
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SUMMARY OF PRESENTATION AND DISCUSS
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eroded during regression and transg
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diamond mining business. Dr. Corbet
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technological step, Dr. Corbett sug
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and Ore Reserves (JORC). He also sa
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With another slide, Dr. Corbett sho
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of De Beers’ deepwater operation
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system that allows other functions
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CHAPTER 16 A CASE STUDY IN THE DEVE
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change through heat transport and c
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Main sites of oxygen minimum Flow o
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• Undertake necessary mitigatory
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State, by such spilling or pollutio
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including diamonds, from non-fluore
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agreements require that government
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including current velocities, oxyge
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ackground levels and confined to a
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Sonar equipment used on some DBM ve
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advocated this approach for environ
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local geology, sedimentology and mi
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Levene’s test could also be used
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unquestionably be alarming, and the
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3.4 Future Innovation in Video Tran
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sponges and bryozoans to more gener
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esearch contributions of Mark Gibbo
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16. Craig R. Smith (1998), The Biol
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magellanicus, Gmein) populations. J
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presentation he would show that kno
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process of self-regulatory checking
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initial mining, but that within a v
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continental shelf. He suggested tha
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would result in the extermination o
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The participant from Saudi Arabia r
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of the Namibian government would be
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With the exception of the West Paci
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1.3 Resources The oceanic regions o
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2 Physiography of the Ocean Floor a
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partially separated continental fra
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occur beneath the continental shelf
Page 688 and 689:
Using these criteria, a number of a
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3.3 Methods used to assess resource
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4.1.2 How marine placer deposits ar
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to survive the transgression are pr
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4.2.2 Where marine phosphorite depo
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sedimentary layers that are favoura
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4.4 Marine Polymetalic sulphides 4.
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4.4.4 Resource potential of marine
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The most up to date information of
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Manganese crusts that are rich in c
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(3) where bottom currents are effec
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There are four elements are of econ
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averaging 2kg/m 2 . These contain e
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520 million tonnes of copper”. In
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Page 718 and 719:
Page 720 and 721:
Elemental resources for the top ten
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natural gas is commonly formed in a
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These areas are almost exclusively
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Table 5 (with reference to Figure 2
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with the term “resource” used e
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Similarly, much of the continental
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Although this is not an assessment
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A qualitative indication of resourc
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4.7.2 How marine gas hydrate deposi
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However, this does not include the
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Figure 28 shows the location of are
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ELCS region Location Hydrate potent
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Franklin Seamount, western Woodlark
Page 748 and 749:
Emery K. O. and Noakes L. C., Econo
Page 750 and 751:
Herzig, P.M. and Hannington M. D.,
Page 752 and 753:
Kvenvolden, K.A., Gas hydrates as a
Page 754 and 755:
Meyer, R.F., Speculations on oil an
Page 756 and 757:
Scott, S.D., Seafloor polymetallic
Page 758 and 759:
Evaporite deposits http://www.black
Page 760 and 761:
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these areas cover something like 25
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continental margins. He mentioned p
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programme off Nankeen, Japan, and t
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een happily persuaded in the other
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Part 4 REGULATORY AND PROMOTIONAL F
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own Namdeb. In addition, there are
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The stated purpose of the Minerals
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programme and specified minimum exp
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them to give proper attention to ea
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evaluation purposes in monitoring t
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as far as the development of minera
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Ms. Zaamwani said that the main leg
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Ms. Zaamwani told participants that
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the Ministry could benefit, as is c
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understaffing do not currently util
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One participant recalled that Ms. Z
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vessels there are sophisticated sec
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Ms. Zaamwani was asked about regula
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70° 60° NORTH SEA -30° -20° -10
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of 9.6 billion Sm 3 oil equivalents
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Nor does it give rights or priority
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1 4. Data Management All data relat
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possibility to evaluate the results
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planning of future activities. The
Page 810 and 811:
SUMMARY OF THE PRESENTATION ON THE
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in the Barents Sea there is still a
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period that can last up to ten year
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conditions in these areas, as well
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designated by the Ministry. She sai
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quantity of data involved in the in
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operation (PDO) is normally prepare
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to the data when an area is relinqu
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CHAPTER 20 STATUS REPORT ON THE DAT
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All the above-mentioned minerals oc
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e water depths between 400 and 1,00
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As far as the Government is concern
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• Ordinance number 195, of Decemb
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This tax must be paid up to January
Page 838 and 839:
the one whose burning is authorised
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ANP may send a representative to fo
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esources other than oil or natural
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to the safety of persons and animal
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found offshore Brazil. With regard
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een discovered in the basin, includ
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enhance oil recovery. He said that
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g. Ordinance number 10 that regulat
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He said that the environment has to
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ids. These comprised five Brazilian
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After oil exploration gained moment
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Those who are entitled to the land
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and replaced by the President, and
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(ii) Assure the safety of navigatio
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explorations may continue concurren
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Appoint an authorized representativ
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The contractor will recover all ope
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of US dollar... (negotiable) within
Page 874 and 875:
Processing of products is subject t
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are more than 30 articles in the va
Page 878 and 879:
Page 880 and 881:
Ambassador Djalal informed particip
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production-sharing contracts became
Page 884 and 885:
said that the remainder of the prod
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and cooperation with Pertamina and
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A participant wanted to know whethe
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of CCOP/SOPAC was to promote and de
Page 892 and 893:
STAR was founded in 1985 in collabo
Page 894 and 895:
Since 1972, SOPAC has, on behalf of
Page 896 and 897:
France Seapso 1985-1986 Cook Is, Fi
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polymetallic massive sulphides. The
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crusts have also been found in area
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Figure 2: Location Map of Known Pol
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is currently no regional agency tas
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The types of data that have been in
Page 908 and 909:
A new agreement between Japan and S
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SOPAC’s continuing and relentless
Page 912 and 913:
deposits will be mined at some poin
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REFERENCES 1. D. Tiffin and C Matos
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18. J. Malnic. (1999). Marine Miner
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8. Individual nations should develo
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SUMMARY OF THE PRESENTATION ON THE
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With regard to the name of the orga
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the benefit that had accrued to the
Page 926 and 927:
The discussions that followed Mr. S
Page 928:
About the International Seabed Auth
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Minerals Report - International Seabed Authority

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