Seatools: Paper on Grab-Based Deep-Sea Mining Released

Seatools, a subsea technology company that provides solutions for a wide range of subsea challenges, has just published paper on grab-based deep-sea mining.

In the field of deep-sea mining, the currently dominant school of thought focuses on the large-scale underwater processing of subsea rocks, the company said.

More specifically, the methodology that is most commonly analyzed gains mineral deposits by rock excavation with a crown or drum cutter, after which the fluidized crushed materials are pumped to a vessel at the surface.

A disadvantage of this method lies with the high energy-incurred costs: a considerable amount of installed subsea power and high overall energy consumption are required.

Hyperbaric conditions at great sea depths require major cutting force, leading to the method’s excessive energy consumption.

An alternative, more energy-efficient subsea mining approach would be to rely on hydraulic grabs, and not crush all materials on the spot.

Not only is the method beneficial in cases of rough terrain and unstable seafloor conditions, an even greater advantage is that most of the rock remains intact. Like this, the material can be crushed at the surface, yielding a reduction of installed subsea power, as well as of overall energy consumption.

The paper compares the techno-economic performance of both subsea mining methodologies. More specifically, a comparison is made between the required installed subsea power and the overall energy consumption of both methodologies.

The summary of the academic paper, which outlines the paper’s main findings, was presented at OTC 2016.

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3rd International Congress Hydraulic Engineering Structures and Dredging

Russia’s leading maritime industry Media Group PortNews ( holds a traditional annual Congress “Hydraulic Engineering Structures and Dredging” in Moscow. 

The two-day Congress includes the 7th International Forum of Dredging Companies and the 3rd Technical Conference “Modern Solutions for Hydraulic Engineering”.

Infrastructure development is among the real sources of Russia’s economy growth. Construction of port facilities and new hydraulic engineering structures on the country’s inland waterways constitute an essential part of all infrastructure projects. It is important to take into account the best international practices to implement these projects effectively.

The program of the Congress will be devoted to the latest technologies for dredging and hydraulic engineering works. Speakers and delegates will refer to real projects to discuss specifics features of dredging works, as well as dedicated fleet and equipment involved.

To learn more about event, please, contact the organizing committee:

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