2018-深海底采矿（英文版）-10mb

Deep Seabed Mining: A Rising Environmental Challenge

Core Content

Deep seabed mining is an emerging activity with significant potential for economic and technological advancement, but it also presents serious environmental challenges. The deep sea, defined as the area below 200 meters depth, constitutes 95% of the ocean's volume and is home to an extraordinary diversity of life, despite its extreme conditions. This region is also rich in mineral resources, including polymetallic nodules, crusts, and seafloor massive sulphide deposits, which are of interest for their high concentrations of valuable metals like cobalt, nickel, copper, and manganese.

Main Points

• Environmental Significance: The deep sea is a unique and largely unexplored ecosystem that supports a wide range of life forms, including cold-water corals, chemo-synthetic communities, and deep-sea fish species. These ecosystems provide critical services such as nutrient cycling, biodiversity maintenance, and water circulation.

• Economic Potential: Deep-sea mining could offer a reliable source of critical metals essential for high-tech and green technologies. However, the financial and environmental costs are substantial, and the long-term impacts on marine environments are poorly understood.

• Technological Development: Advances in remote-operated equipment and marine monitoring technologies have made deep-sea mining more feasible. These systems must operate under extreme conditions, including high pressure and low temperatures, to extract minerals from depths ranging from 1,000 to 6,000 meters.

• Legal Framework: The 1982 United Nations Convention on the Law of the Sea (UNCLOS) establishes the deep seabed beyond national jurisdiction as the "common heritage of mankind," requiring that mining operations benefit all of humanity. The International Seabed Authority (ISA) is responsible for managing this regime, granting licenses and ensuring environmental protection.

• Current Status: Deep-sea mining is entering a new phase, with initial small-scale operations in national waters and over 29 exploration contracts issued for international areas. However, commercial mining in international waters is still years away due to technological, economic, and regulatory hurdles.

• Environmental Risks: The potential impacts of deep-sea mining include the physical disturbance of habitats, removal of mineral deposits that host unique species, and the creation of sediment plumes that could affect marine life beyond the mining zone. These risks highlight the need for comprehensive baseline studies and robust environmental management strategies.

Key Information

• Mineral Types:

  • Polymetallic nodules: Found on abyssal plains, rich in manganese, nickel, copper, and cobalt.
  • Polymetallic crusts: Located on seamounts, contain high concentrations of rare earth elements and other metals.
  • Seafloor massive sulphide deposits: Found near hydrothermal vents, rich in metals like copper, zinc, and gold.

• Environmental Challenges:

  • Limited understanding of deep-sea ecosystems and their services.
  • Difficulty in assessing the long-term impacts of mining on biodiversity and ecosystem functioning.
  • Potential for irreversible damage to unique and fragile habitats.
  • Sediment plumes and physical disturbances could have far-reaching effects.

• Regulatory Considerations:

  • UNCLOS outlines the legal framework for deep-sea mining, emphasizing the need for equitable benefit-sharing and environmental protection.
  • The ISA is tasked with overseeing mining activities and ensuring compliance with these principles.
  • National regulations also play a role in managing deep-sea mining within EEZs.

• Economic and Social Costs:

  • High financial investment is required for mining operations, including capital expenditures and technology development.
  • There are societal costs, such as the degradation of marine ecosystems and the potential loss of biodiversity.
  • The economic benefits are uncertain and depend on metal prices and market demand.

Recommendations

The report concludes with several recommendations to ensure that deep-sea mining is conducted in a sustainable manner:

• Conduct comprehensive baseline studies to understand the deep sea's ecosystems and their functions.
• Develop and enforce robust environmental regulations to mitigate the impact of mining activities.
• Ensure that the benefits of deep-sea mining are shared equitably among all nations.
• Promote international cooperation and oversight to address the environmental and social implications of mining.

Conclusion

While deep-sea mining holds promise for meeting the growing demand for critical metals, it must be approached with caution due to its potential to cause significant environmental harm. The report underscores the need for a science-based regulatory framework that balances economic development with the protection of one of Earth's last unexplored frontiers.