Deep-sea mining is crucial to many industries in numerous ways. How is it beneficial to the electronics industry?
FREMONT, CA: The supply of minerals like copper, cobalt, nickel and many more that are crucial to electronics manufacturing is infinite, and their demand is increasing with each passing year.
By combining numerous technologies, from remotely-operated automobiles to novel mapping methods, some are delving into the Earth’s crust on the bottom of the oceans to mine for these minerals.
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Technological Challenges of the Sea Bed Environment
Every proposed source of sea bed minerals poses a challenge to access. There is a need for some technologies for underwater mining that already exists, but new expeditions will also require ones that still need to be developed.
The most likely intersection of technologies will be mapping, robotics, navigation, and electromechanical equipment that are able to sustain high pressure, depth, and high acidity.
Undersea Mapping
It has been approximated that only 5 percent of the total ocean floor has been mapped, which means more than half of the Earth is unmapped.
The R/V Falkor multibeam sonar systems are being used these days for creating high-resolution bathymetric maps. The EM302 multibeam sonar system is utilized for deepwater mapping, capable of imaging 8,000 m depths. The EM710 multibeam echo sounder is considered a more suitable tool for more shallow water of less than 2,000 m.
Both of these systems extend mapping speed and range. Everything from water temperature, ship speed, and salinity are needed to be considered when processing sonar data.
Mapping and prospecting are generally considered the first steps necessary prior to the occurrence of actual sea mining.
Autonomous Exploration
After the conduction of mapping, it is vital to identify the areas of interest and investigate it further. This is where remotely-operated vehicles (ROV) and related technologies come into the picture.
ROVs typically hosts a suite of manipulators and sensors for minerals prospecting. Sonar and visual sensors help in providing feedback for operators that are generally onboard a tethered vessel or on land. The chemical sensors help indicate the change in pH of water which further helps in locating hypothermal vents. Manipulators and drills enable operators to check for mineral deposits and detect areas of interest. Based on the objective, they are mainly designed for high heat or high-pressure environments
For example, ROVs like the RainbowFish is built with a focus on manoeuvrability, immediate communication capabilities, hovering and sample collection while hovering.
The ROVs are built with high-resolution mapping sonar, imaging and positioning sonar, acoustic doppler speedometers, and collision-avoidance sonar.
Deep-sea mining is not a new concept. However, it is a profoundly complex task that will benefit from new sensor technologies, more ruggedized components, and the autonomous and remotely-operated vehicles’ influx.
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