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Highlighting of nickel using the hyperspectral signal of minerals originating from New Caledonia lateritic profiles

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Academic year: 2021

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Highlighting of nickel using the hyperspectral signal of minerals originating from New Caledonia lateritic profiles

Duée Cédric

1*

, Da Silva Alves Anthony

1

, Maubec Nicolas

1

, Blaineau Pierre-Gilles

1

, Orberger Beate

2,3

, Bui Thanh

2

, Pillière Henry

4

, Bourrat Xavier

1

, Le Guen Monique

2

1

BRGM, 3 avenue Claude Guillemin, BP36009, 45060 Orléans Cedex 2, France

2

ERAMET-ER-SLN, 1 avenue Albert Einstein, 78190 Trappes, France

3

GEOPS-Université Paris Sud, Bâtiment 504, 91405 Orsay Cedex, France

4

INEL-ThermoFisher Scientific, 71 rue d’Orléans, 45410 Artenay, France

*Corresponding author: [email protected]

The SOLSA project (www.solsa-mining.eu) aims to develop an on-line-on-mine expert system coupling sonic drilling, chemical and mineralogical analyses and data treatment. In a first place, this expert system is planned for lateritic profiles of New Caledonia, known to held nickel.

The latter is found in two forms in these profiles. First, nickel can be adsorbed on the surface or inserted in the structure of goethite (α-FeOOH) present in the limonites and saprolites. Second, Ni may substitute Mg in different silicates of saprolite, like in garnierite, known to be nickel-rich and corresponding to a mixture of phyllosilicates usually occurring as vein or porosity filling.

The SOLSA system will combine several analytical techniques, such as XRD, XRF, Raman spectroscopy, RGB or hyperspectral, and the data collected will be compared to an internal library in order to identify the several minerals present in the lateritic profiles. Therefore, the elaboration of a comprehensive library, taking into account the influence of chemistry on the different signals, is mandatory.

Thus, our study focuses on the evolution of the hyperspectral signal (400-2500 nm) with the quantity of nickel for several Ni-bearing silicates present in the lateritic profile. Among the results, nickel influences the behaviour of the doublet in the 1380-1405 nm region for the specific mineral association constituting the garnierite.

References:

Faust, G.T (1966) American Mineralogist 5: 279.

Cluzel, D., Vigier, B. (2008) Resource Geology 58: 161.

The SOLSA consortium thanks the European Commission for having sponsored this project (SC5-11d-689868) in the H2020 program.

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