Cobalt in the regolith upon Nui Nua ultramafic Massif

Cobalt (Co) Metal plays an increasingly important role in the battery and engine manufacturing industry for electric cars. Previously most of Co was mined as by-product in copper ore deposits in Central Africa. Recently, the proportion of Co extracted from other sources such as weathering-derived mines on ultramafic rocks is increasing. In Vietnam, Cobalt has been discovered in Cu-Ni ore deposits in the Northeast and Northwest Regions. The literature shows that cobalt is found in small amounts in ultramafic rocks. During the weathering process of ultramafic rocks, Co ions will be priority adsorbed in the hydroxide colloids of Mn and Fe (goethite and asbolan). In the regolith upon Nui Nua Masif, Ni content increased dramatically (several times) from 0.19% in bedrocks up to 1% in some locations, while cobalt content just increased only slightly (from 0.02% in bedrock to 0.05 regolith, rarely up to 0.1%). The results of the previous analysis of weathered crust samples of ultramafic rocks of Nui Nua massif by several authors show that, unlike Ni which is presented in both silicate minerals and Fe-Mn oxide/hydroxide, cobalt ions tend to be concentrated in Fe-Mn oxides/hydroxides. Our SEM analyses combined with EDS show some remarkable results: the Co content in some specific minerals is quite high from 1.12÷4.67% (denominator). This is only a preliminary result and it is necessary to conduct more work to further detailed studies defining the Co potential in weathering products of ultramafic rocks of Nui Nua massif as well as in the areas where other ultramafic rocks are developed. Recently, research confirmed that there is a significant Co-Ni occurrence discovered in Mau Lam Valley (Southwest of Nui Nua Massif).

How to Cite

Nguyen, T.Trung, Nguyen, G.Khac, Nguyen, T.Huu, Vo, C.Cong Thi and Nguyen, H.Manh 2023. Cobalt in the regolith upon Nui Nua ultramafic Massif. Journal of Mining and Earth Sciences. 64, 6 (Dec, 2023), 39-49. DOI:https://doi.org/10.46326/JMES.2023.64(6).05.

References

An, P. V., and Giang, N. K. (1997). Potential of Nickel-Coban ores in the weathering crust of ultramafic rocks in Vietnam. Proceeding of "International Seminar on “Geology and Metalic Minerals”, Hanoi, Vietnam, 35-36.

An, P. V., and Huyen, N. T. (1979). Existence form of Ni-Co in regolith on Nui Nua ultramafic rocks. The Selection Volume of Sicentific works of Hanoi University of Mining and Geology (1980-1981). HUMG, 12-17.

Brand, N.W., Butt, C.R.M., and Elias, Mick (1998). Nickel laterites-Classification and features.AGSOJournal of Australian Geology and Geophysics, 17(4), 81-88.

Butt, C. R. M., and Cluzel, D. (2013). Nickel laterite ore deposits: Weathered serpentinites. 658 Elements. 9(2), 123-128. https://doi.org/10. 2113/gselements.9.2.12

Dang, P.T., Xuan, P.T., and Pho, N.V. (2020). Garnierite in Weathering crust of Ultramafic blocks from Cao Bang area, north Vietnam.Vietnam Journal of Earth Sciences, 42(2), 130-140.

Dao, N. X. (Chief Editor). (1983). Exploration Report on prospecting Cr-Ni-Co in Nui Nua area, Thanh Hoa province. The Center for Geological information and data resources, Hanoi.

Giang, N. K., and Dung, L. T. (2020). Distribution characteristics and potential of Nickel and Cobalt in Nui Nua area, Thanh Hoa province. National Conference on Earth Sciences and Resources with Sustainable Development (ERSD 2020), Hanoi.

Giang, N. K., and An, P. V. (1998). Nickel enrichment mechanism during weathering process of minerals in ultramafic rocks in humid tropical condition in Vietnam. The Journal of Geology and Materials, 1, 18-23.

Golightly, J.P. (2010). Progress in understanding the evolution of nickel laterites. Econ. Geol. Spec. Publ. 15, 451-485.

Shedd, K. B. (2018). Coban Statistics and Information. U.S. Geological Survey, Mineral Commodity Summaries, January 2018.

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