title: Manganese nodules on the sea floor: inverse correlation between grade and abundance.
abstract: The grade of copper and nickel in manganese nodules is negatively correlated with their abundance on the sea floor, within small regions and in the Pacific Ocean as a whole. Although the correlation tells nothing about estimates of commercially mineable reserves at particular sites, it contradicts an assumption on which many predictions with respect to manganese nodule resources are based.
authors.forename: H W
authors.initials: HW
authors.lastname: Menard
authors.forename: J Z
authors.initials: JZ
authors.lastname: Frazer