Minerals Report - International Seabed Authority

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CHAPTER 16 A CASE STUDY IN THE DEVELOPMENT OF AN ENVIRONMENTAL BASELINE IN A LARGE OPEN-OCEAN SYSTEM OFF SOUTHERN NAMIBIA BY DE BEERS MARINE I. Corbett, Group Mineral Resources Manager De Beers Placer Resources Unit, Cape Town, South Africa The continental shelf of Namibia is strongly influenced by the Benguela Current, and is recognised as one of the main upwelling sites in the world’s oceans. Hence the region in which deep-water offshore diamond mining occurs is characterised by high biological productivity. Although not directly within the area being mined, the continental shelf of South Africa and southern Namibia is known for its stocks of pelagic and demersal nekton, with important fisheries contributing both to the local economy and to employment along the coast. The development of deep-water diamond mining has progressed significantly since 1991, when De Beers Marine (DBM) delivered the first official production. To date, some 13 km² of the continental shelf has been mined within the 6098 km² Atlantic 1 Mining License held by NAMDEB (an equal partnership between De Beers and the Government of the Republic of Namibia). Annual production from DBM is extracted from between 2 to 2.5 km² of seabed spread over a wide area. The mining process is precise, with extraction of diamond from plant feed gravel being a non-chemical process aided by dense media separation. Undersize and oversize materials, together with tailings are discharged overboard and settle back to the seafloor. Given the unique nature of the operation, no previous experience was available to guide De Beers Marine in its assessment of environmental impacts for deep-water offshore diamond mining operations. De Beers Marine has opted for a transparent, proactive approach to the development of an environmental management programme. Progress through continuous improvement of environmental management culminated in the company becoming the first ISO 14001 certified marine diamond mining company in the world. The application of the ISO approach customised specifically to offshore mining ensures that INTERNATIONAL SEABED AUTHORITY 614
environmental management is holistic, encompassing the direct impacts of mining together with the management of waste. DBM has progressed in understanding the nature and extent of impacts since the initial studies to establish an environmental baseline. This was an essential aspect in developing an understanding of the company’s environmental impacts due to the paucity of detailed information about the dynamics of the Benguela system. A key element was to understand the system’s natural variability driven by large-scale natural events that see low oxygen water introduced across the shelf on a regular basis, with the introduction of large volumes of suspended sediment from Orange River flood events providing an additional factor. Without this, discrimination of local-scale mining impacts from the influence of natural events would not be possible. Experience has proved that conventional sampling techniques to determine impacts have inherent difficulties. Many new insights have been derived from direct visual observation using the Jago submersible, coupled with detailed analysis of video material collected during submersible transects – a first for the Benguela system. This paper draws upon many contributions from studies commissioned and aided by De Beers Marine to develop an environmental baseline for the determination of impacts related to offshore diamond mining on the southern continental shelf of Namibia and for the continuous improvement of environmental management. As such, it presents an overview based on the contribution of many different scientists and staff of De Beers Marine. It is hoped that the paper will contribute to the development of environmental management philosophies for the deep-sea mining industry of the future. 1 Macro-Scale Ocean System Setting of Offshore Diamond Mining in Southern Namibia Offshore diamond mining operations occur on the inner and middle continental shelf along the southwestern continental margin of Africa [1], with Exclusive Prospecting Licenses awarded by the Namibian Government extending to 2000 mbsl on the continental slope. The Benguela Current strongly influences the continental shelf, which has long been recognised as one of the world’s major upwelling regions and the site of prolonged scientific study [2] since the Challenger and Discovery Expeditions over a century ago. More recently, the ocean’s role in climate INTERNATIONAL SEABED AUTHORITY 615
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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
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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
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
Page 584 and 585: The Orange River, one of Africa’s
Page 586 and 587: formation of a large accretion coar
Page 588 and 589: The deep-water ore body more closel
Page 590 and 591: 4. The mineral resource management
Page 592 and 593: deployed on a MacArtney FOCUS 400 R
Page 594 and 595: Utilising Jago has made very detail
Page 596 and 597: Although at first glance the nature
Page 598 and 599: to levels capable of sustaining sea
Page 600 and 601: In accordance with De Beers’ over
Page 602 and 603: ACKNOWLEDGEMENTS I thank my many co
Page 604 and 605: 16. I.B. Corbett (1989), The sedime
Page 606 and 607: SUMMARY OF PRESENTATION AND DISCUSS
Page 608 and 609: eroded during regression and transg
Page 610 and 611: diamond mining business. Dr. Corbet
Page 612 and 613: technological step, Dr. Corbett sug
Page 614 and 615: and Ore Reserves (JORC). He also sa
Page 616 and 617: With another slide, Dr. Corbett sho
Page 618 and 619: of De Beers’ deepwater operation
Page 620 and 621: system that allows other functions
Page 624 and 625: change through heat transport and c
Page 626 and 627: Main sites of oxygen minimum Flow o
Page 628 and 629: • Undertake necessary mitigatory
Page 630 and 631: State, by such spilling or pollutio
Page 632 and 633: including diamonds, from non-fluore
Page 634 and 635: agreements require that government
Page 636 and 637: including current velocities, oxyge
Page 638 and 639: ackground levels and confined to a
Page 640 and 641: Sonar equipment used on some DBM ve
Page 642 and 643: advocated this approach for environ
Page 644 and 645: local geology, sedimentology and mi
Page 646 and 647: Levene’s test could also be used
Page 648 and 649: unquestionably be alarming, and the
Page 650 and 651: 3.4 Future Innovation in Video Tran
Page 652 and 653: sponges and bryozoans to more gener
Page 654 and 655: esearch contributions of Mark Gibbo
Page 656 and 657: 16. Craig R. Smith (1998), The Biol
Page 658 and 659: magellanicus, Gmein) populations. J
Page 660 and 661: SUMMARY OF PRESENTATION AND DISCUSS
Page 662 and 663: presentation he would show that kno
Page 664 and 665: process of self-regulatory checking
Page 666 and 667: initial mining, but that within a v
Page 668 and 669: continental shelf. He suggested tha
Page 670 and 671: 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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Page 684 and 685:
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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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
Page 744 and 745:
Page 746 and 747:
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:
SUMMARY OF PRESENTATION AND DISCUSS
Page 762 and 763:
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
Page 784 and 785:
Ms. Zaamwani said that the main leg
Page 786 and 787:
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
Page 792 and 793:
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
Page 808 and 809:
planning of future activities. The
Page 810 and 811:
SUMMARY OF THE PRESENTATION ON THE
Page 812 and 813:
in the Barents Sea there is still a
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period that can last up to ten year
Page 816 and 817:
conditions in these areas, as well
Page 818 and 819:
designated by the Ministry. She sai
Page 820 and 821:
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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