Off shore mining

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ppt is basicly an introduction to offshore mining,with major technologies&types of mining and environment concecuences

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  • Other than the major share for the limonite, retile, zircon and tin , isn't offshore mining also contribute a lot to the coal and gold industry?
    ~pls advise. thks
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Off shore mining

  1. 1. -
  2. 2. Offshore mining continues to provide a major share of the world's limonite, retile, zircon, and tin supplies. A better understanding of shore processes, more detailed offshore bathymetry, and more complete information on pale geographic history are being used to locate and evaluate marine placer deposits.
  3. 3. MAJOR REGIONS OF OFF SHORE MINING • offshore mining in Australia, Brazil, England, India, Japan, Malaysia, New Zealand, South Africa, and the United States of America. Prospecting activity has recently taken place on the Bering Sea floor adjacent to the Seward peninsula, Alaska; the Celtic Sea floor adjacent to the Cornwall peninsula; and the Gulf of Carpentaria floor west of the Cape York peninsula, Australia.
  4. 4. TYPES OF OFF SHORE MINING Seabed mining can be subdivided into two components:  shallow marine mining  deep sea mining
  5. 5.  SHALLOW MARINE MINING • Shallow marine mining largely refers to the extraction of mud, sand and gravel for construction purposes. • Also refer to the mining of valuable minerals in the nearshore shallow waters. • Mining for construction sand and precious stones (diamond and other gemstones) in shallow marine areas has been ongoing in various parts . • Such mining is common in the Pacific Islands region and the coastal areas of southern Africa.
  6. 6. DEEP SEA MINING • Deep sea mining is a relatively new, extreme, and dangerous mineral retrieval process that takes place on the ocean floor. • Ocean mining sites are usually around large areas of polymetallic nodules at about 1,400 - 3,700 m below the ocean’s surface. • The vents create sulfide deposits, which contain valuable metals such as silver, gold,opper, manganese, cobalt, and zinc.
  7. 7. DEEP SEA MINING
  8. 8. Mining Technology Development • Since the early 1990s, a number of developed countries including Germany, Japan, China, Korea, India and the United States, were reported to have been working on developing new offshore mining systems for collecting and lifting nodules . • Shallow offshore mining industry and gas and oil production technologies are transferable to deep seabed mining.
  9. 9. The planned mining system has three major components: a) a Mining Support Vessel (MSV), b) a Riser and Lifting System (RALS), c)and a Seafloor Mining Tool (SMT) . The system is designed to operate at a production rate of 6,000 tonnes of SMS ore a day at Nautilus Minerals’
  10. 10. EFFACTS OF OFF SHORE MINING ON ENVIRONMENT As off shore mining is a relatively new field, the complete consequences of full scale mining operations are unknown. But it is believed that • removal of parts of the sea floor will result in disturbances to the benthic layer, • increased toxicity of the water column and sediment plumes from tailings.] • Removing parts of the sea floor could disturb the habitat of benthic organisms, with unknown long-term effects.
  11. 11. THE END

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