Minerals Report - International Seabed Authority

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3. Hydrothermal Convection At oceanic spreading centers, seawater penetrates deeply into the newly formed oceanic crust along cracks and fissures, which are a response to thermal contraction and seismic events typical for zones of active seafloor spreading. The seawater circulating through the oceanic crust at seafloor spreading centers is converted into an ore-forming hydrothermal fluid in a reaction zone that is situated close to the top of a sub axial magma chamber (Fig. 3). Major physical and chemical changes in the circulating seawater include (i) increasing temperature, (ii) decreasing pH, and (iii) decreasing Eh. The increase in temperature from about 2°C to values >400°C 31, 32 is a result of conductive heating of a small percentage of seawater close to the solidified top of a high-level magma chamber 33 . This drives the hydrothermal convection system and gives rise to black smokers at the seafloor. Highresolution seismic reflection studies have indicated that some of these magma reservoirs may occur only 1.5-3.5 km below the seafloor 34, 35 . The crustal residence time of seawater in the convection system has been constrained to be 3 years or less 36 . Data from water/rock interaction experiments indicate that, with increasing temperatures, the Mg 2+ dissolved in seawater (about 1,280 ppm) combines with OH-groups (which originate from the dissociation of seawater at higher temperatures) to form Mg OH2, which is incorporated in secondary minerals such as smectite (200°C) 37,38,39,40 . The removal of OH-groups creates an excess of H + ions, which is the principal acid-generating reaction responsible for the drop in pH from seawater values (pH 7.8 at 2°C) to values as low as pH 2 41 . Exchange of H + for Ca 2+ and K + in the rock releases these elements into the hydrothermal fluid. The leaching of Ca 2+ balances the continuous removal of Mg 2+ from seawater. Endmember hydrothermal fluids are defined as presumed deep-seated high-temperature fluids computed by extrapolating compositions and physical parameters back to Mg=0 on the assumption of quantitative removal of Mg. At high temperatures, however, the formation of epidote (Ca fixation) also results in an excess of H + that further contributes to the acidity of the hydrothermal fluid. These reactions take place at water/rock ratios of less than five and commonly close to one 42 . The oxygen which is present in the circulating seawater in the form of sulphate is removed partly by precipitation of INTERNATIONAL SEABED AUTHORITY 114
anhydrite and partly through conversion of igneous pyrrhotite to secondary pyrite and the oxidation of Fe 2+ to Fe 3+ forming Fe-oxyhydroxides and secondary magnetite in the basalt 40 . Partial reduction of seawater SO4 2- contributes to the formation of H2S, but most of the reduced S in the fluid is derived from the rock itself. SEAWATER MASSIVE BLACK SMOKERS MAGMA CHAMBER SULFIDES STOCKWORK SEAFLOOR PILLOW LAVAS SHEETED GABBRO DIKES PERIDOTITE Figure 3. Model showing a seawater hydrothermal convection system above a sub axial magma chamber at an oceanic spreading center. Radius of a typical convection cell is about 3-5 km. Depth of the magma chamber usually varies between 1.5 and 3.5 km. This highly corrosive fluid is now capable of leaching elements such as Li, K, Rb, Ca, Ba, the transition metals Fe, Mn, Cu, Zn, together with Au, Ag and some Si from the oceanic basement 43 . Sulphide droplets in the basalt are considered to be the major source for metals and S 44 . The metals are mainly transported as chloride complexes at high temperatures and, in some cases, as bisulphide complexes (in particular Au) at lower temperatures. INTERNATIONAL SEABED AUTHORITY 115
Page 2 and 3:
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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Page 76 and 77: Chapter 7 Technical requirements fo
Page 78 and 79: Table 1: Classification of marine m
Page 80 and 81: Volcanogenic Metalliferous sediment
Page 82 and 83: deposits, including massive sulphid
Page 84 and 85: 3. Marine Minerals Related to Deep
Page 86 and 87: The black smoker chimneys dischargi
Page 88 and 89: contain metals are present at discr
Page 90 and 91: Figure 4. A diagrammatic east-west
Page 92 and 93: and refining of these crusts is mor
Page 94 and 95: distances of hundreds of kilometres
Page 96 and 97: 2) Deep ocean hot springs at massiv
Page 98 and 99: 6. P.A. Rona, M.D. Hannington, C.V.
Page 100 and 101: 25. M.J. Cruickshank (1998), Law of
Page 102 and 103: With regard to marine mineral depos
Page 104 and 105: Focussing on sites of sea floor min
Page 106 and 107: scientific journal "Nature". The su
Page 108 and 109: Professor Rona recalled that the in
Page 110 and 111: like St. Stephen’s in the Kremlin
Page 112 and 113: He noted that another product of ho
Page 114 and 115: The reasons why the Red Sea deposit
Page 116 and 117: a number of geothermal wells have b
Page 118 and 119: 1. Introduction The discovery of hi
Page 120 and 121: 0° 30° 30° 60° Explorer Ridge C
Page 124 and 125: Due to its increased buoyancy at hi
Page 126 and 127: 5. Metal Contents Despite moderate
Page 128 and 129: (11.8 wt.%), and have high concentr
Page 130 and 131: Table 3: Size and Tonnage - Atlanti
Page 132 and 133: Local enrichment of more than 40 pp
Page 134 and 135: the Red Sea, Middle Valley, Explore
Page 136 and 137: Table 8: Advantages of Seafloor Mas
Page 138 and 139: 60 kg Au) located on the neighbouri
Page 140 and 141: 9. Perspective If further explorati
Page 142 and 143: 3. J.M. Franklin, J.W. Lydon, and D
Page 144 and 145: 19. R.A. Zierenberg, Y. Fouquet, D.
Page 146 and 147: 35. J. Collier, M. Sinha (1990), Se
Page 148 and 149: 53. P.M. Herzig, Y. Fouquet, M.D. H
Page 150 and 151: 68. M.D. Hannington, J.M. Peter, an
Page 152 and 153: 85. The New York Times (1997), Firs
Page 154 and 155: southern segment is a fast-spreadin
Page 156 and 157: Professor Herzig said that the spec
Page 158 and 159: Professor Herzig said that the depo
Page 160 and 161: Professor Herzig informed participa
Page 162 and 163: he informed participants that in ad
Page 164 and 165: In relation to Conical Seamount, Pr
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Page 170 and 171: 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
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dimensional seafloor massive sulphi
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workshop, in relation to deposit ev
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an economic perspective, including
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sulphides and cobalt-rich ferromang
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CHAPTER 13 PETROLEUM POTENTIAL AND
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structure and filled with sediments
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Basin groups are subdivided into ty
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during the late Mesozoic-Cenozoic s
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Figure 4: Volume density of initial
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ITIPRHC = Vnr φHC γ 103 (Mmtoe),
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Table 1: Offshore (deepwater) initi
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Speaking about particular geographi
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World Ocean, including areas off no
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Table 4: Largest oil and gas discov
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The extremely harsh environment bro
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In other regions of the world, enco
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REFERENCES 1. L.G. Weeks (1971), Ma
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SUMMARY OF PRESENTATION AND DISCUSS
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Dr. Vysotsky said that estimates of
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In Southeast Asia, Dr. Vysotsky spo
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Philippines, and possibly Brazil. W
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and we shall encounter severe deple
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In the 1960's scientists discovered
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Figure 2. Worldwide locations of kn
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methane by bacteria in an anoxic en
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It has been assumed that the struct
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identification of gas hydrate in ma
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ottom simulating reflections (BSR)
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Figure 6: Interpretative plot of hy
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floor have indicated the presence o
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of free gas below the BSR is usuall
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sediment and to provide an indicati
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6. Harvesting methane hydrates -Som
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deposits can be commercial, even in
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at a catastrophic scale. Some of th
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Figure 8. Development of hydrate re
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This is perhaps due to the percepti
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would provide Japan with methane fo
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NOTES AND REFERENCES 1. E.D. Sloan
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20. R.F. Meyer (1981), Speculation
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Master Workshop on Gas Hydrates: Re
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60. M.D. Max and M.J. Cruickshank (
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is that their exploitation might re
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further pointed out that even if on
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Dr. Desa also informed participants
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thickness of the sediments, the thi
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pressure at sea level leads to hydr
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aware of any studies of natural ear
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CHAPTER 15 A CASE STUDY IN THE DEVE
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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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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
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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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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
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Emery K. O. and Noakes L. C., Econo
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Herzig, P.M. and Hannington M. D.,
Page 752 and 753:
Kvenvolden, K.A., Gas hydrates as a
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Meyer, R.F., Speculations on oil an
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Scott, S.D., Seafloor polymetallic
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Evaporite deposits http://www.black
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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
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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
Page 822 and 823:
operation (PDO) is normally prepare
Page 824 and 825:
to the data when an area is relinqu
Page 826 and 827:
CHAPTER 20 STATUS REPORT ON THE DAT
Page 828 and 829:
All the above-mentioned minerals oc
Page 830 and 831:
e water depths between 400 and 1,00
Page 832 and 833:
As far as the Government is concern
Page 834 and 835:
• Ordinance number 195, of Decemb
Page 836 and 837:
This tax must be paid up to January
Page 838 and 839:
the one whose burning is authorised
Page 840 and 841:
ANP may send a representative to fo
Page 842 and 843:
esources other than oil or natural
Page 844 and 845:
to the safety of persons and animal
Page 846 and 847:
found offshore Brazil. With regard
Page 848 and 849:
een discovered in the basin, includ
Page 850 and 851:
enhance oil recovery. He said that
Page 852 and 853:
g. Ordinance number 10 that regulat
Page 854 and 855:
He said that the environment has to
Page 856 and 857:
ids. These comprised five Brazilian
Page 858 and 859:
After oil exploration gained moment
Page 860 and 861:
Those who are entitled to the land
Page 862 and 863:
and replaced by the President, and
Page 864 and 865:
(ii) Assure the safety of navigatio
Page 866 and 867:
explorations may continue concurren
Page 868 and 869:
Appoint an authorized representativ
Page 870 and 871:
The contractor will recover all ope
Page 872 and 873:
of US dollar... (negotiable) within
Page 874 and 875:
Processing of products is subject t
Page 876 and 877:
are more than 30 articles in the va
Page 878 and 879:
Page 880 and 881:
Ambassador Djalal informed particip
Page 882 and 883:
production-sharing contracts became
Page 884 and 885:
said that the remainder of the prod
Page 886 and 887:
and cooperation with Pertamina and
Page 888 and 889:
A participant wanted to know whethe
Page 890 and 891:
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
Page 898 and 899:
polymetallic massive sulphides. The
Page 900 and 901:
crusts have also been found in area
Page 902 and 903:
Figure 2: Location Map of Known Pol
Page 904 and 905:
is currently no regional agency tas
Page 906 and 907:
The types of data that have been in
Page 908 and 909:
A new agreement between Japan and S
Page 910 and 911:
SOPAC’s continuing and relentless
Page 912 and 913:
deposits will be mined at some poin
Page 914 and 915:
REFERENCES 1. D. Tiffin and C Matos
Page 916 and 917:
18. J. Malnic. (1999). Marine Miner
Page 918 and 919:
8. Individual nations should develo
Page 920 and 921:
SUMMARY OF THE PRESENTATION ON THE
Page 922 and 923:
With regard to the name of the orga
Page 924 and 925:
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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