The polymetallic nodule resources were estimated in three stages. During the first stage completed in 2007, the overall resources were estimated for both of the exploration sectors B1 and B2, focusing on selected metals (Mn, Ni, Mo, Co, Cu and Zn). During the second stage (2011) resources within the H11 exploration block were estimated, both for the nodules and four major metals: Co, Cu, Mn and Ni. In the third stage (2015) a similar estimation was completed for the H22 exploration block. Ordinary geo-statistical kriging method was applied to estimate the distribution and amount of resources. The areas of ocean-floor slope over 7° were not included into the resources estimation.

Mineral Resource Estimate for the IOM Exploration Area, calculated for wet PN, abundance cut-off 10 kg/m2 of wet PN (2016).

Mineral Resource ClassificationAbundance
(wet kg/m2)
Polymetallic Nodules
(PN) (million tons)
Indicated (H11 exploration block)14.631.741.311.290.1641.4
Indicated (H22 exploration block)
Indicated total     73.3
Inferred (B1 exploration sector)13.427.891.210.900.2162.6
Inferred (B2 exploration sector)13.131.531.321.240.18242.9
Inferred total     305.5