Mining in the Deep


Deep-sea mining has been coming for the better part of 50 years. Now, experts argue that this process can be done sustainably, with minimal disturbance to the surrounding seafloor. (Undark)

Use our resources to better understand undersea mining—and the other kind of SMS.

Teachers, scroll down for a short list of key resources in our Teachers’ Toolkit, including today’s simple MapMaker Interactive map.

This diagram of the geochemistry of an ocean vent provides some idea of the minerals that could be mined. Image courtesy Submarine Ring of Fire 2002, NOAA/OER
This diagram of the geochemistry of an ocean vent provides some idea of the minerals that could be mined.
Image courtesy Submarine Ring of Fire 2002, NOAA/OER

An ocean vent sits over a deep fissure in the ocean floor. Ocean vents eject hot, often toxic, fluids and gases into the surrounding seawater. They often mark sites of tectonic activity, and create some of the most hostile habitats on Earth. There are many different types of ocean vents: diffuse flows, black smokers, white smokers, and vents associated with undersea volcanoes. Scroll through this gallery to peek into some vents, and click here for a history of their discovery.

Discussion Ideas




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  • Why are hydrothermal vents an attractive site for mining?
    • Obviously, SMS deposits are rich in valuable ores.
    • Ocean vents are free of the layers of soil and rock that surface miners must excavate. The ore is literally piled up on the seafloor.


  • What makes mining SMS deposits so challenging?
    • Seafloor mining is a complicated and expensive procedure. Although the ores are not underground, they are underwater. The work must be conducted remotely, by specialized equipment that can function in extremely cold, salty water, and, perhaps most crucially, under great pressure.


  • How might seafloor mining impact the ecology of ocean vent ecosystems?
    • Extractive activity is always invasive: According to our entry, “[t]he environmental impact is enormous. Microbes and animals are destroyed or displaced as the seafloor is disrupted.”
    • We don’t know what’s out there: According to WHOI, “No two vents discharge exactly the same mixes of fluids, so no two vents are colonized by exactly the same life forms . . . These strange life forms may hold clues to how life started on Earth. So little is known about them that if vents are mined, we may never know what species have been lost.”
    • Extractive activity might impact life beyond the immediate area: Undark reminds us that “[s]urrounding every hydrothermal vent is a halo of fauna that, though not endemic to hydrothermal vents, aggregate around them due to the prodigious amount of food available . . . Halo fauna are deep-sea generalists, adapted to an environment that is vast and stable. Where hydrothermal vent communities may be resilient to the environmental insult of deep-sea mining, any level of disturbance will likely exceed the resilience of the halo community.”


  • Why might these ecological concerns not be as serious as they first appear? Both
    • Undark and WHOI provide some mitigating evidence.
      • Catastrophe is the norm:Deep-sea hydrothermal vents. . . are exceptionally dynamic ecosystems, experiencing natural, occasionally catastrophic disturbance on a decadal time scale. Whether a mining event exceeds the natural disturbance of a hydrothermal vent ecosystem is one of many unknowns of this largely unexplored venture.”
      • Conservation science is ahead of industry:We have almost 40 years of data about deep-sea hydrothermal vents. This presents us with a rare opportunity to establish environmental and biodiversity baselines at the prospective site and within connected communities, before the first mining tool crawls across the seafloor.”
      • Vents aren’t always isolated: Many SMS-rich vent fields are not isolated ecosystems, but part of a “biogeographic province—an area in which vent systems share the same fauna . . . Identifying and establishing refuges, or vent fields where mining cannot occur, may be adequate to preserve the overall biodiversity of the biogeographic province and act as a source for later recruits if the mine site recovers. In the rare circumstances where we’ve been fortunate enough to observe a vent system recover after volcanic eruptions decimate the community, this has been the case.”
      • These are hardy ecosystems:The mining industry maintains that it is using and developing environmentally sensitive techniques, and many ocean habitats often appear to recover from damage.”



Undark: Living With Deep-Sea Mining

Nat Geo: What are ocean vents?

Nat Geo: Where is the world’s first deep-sea mining operation? MapMaker Interactive map

Nat Geo: Deep-Sea Geysers

Woods Hole Oceanographic Institution: What is Seafloor Mining?

Nautilus Minerals: Solwara I

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