Comparison of magnetic particles in airborne dust on Mars and in the Harmattan dust from south of Sahara

Knudsen, J. M.; Madsen, M. B.; Kakane, V.C.K.; Awadzi, Theodore W.; Hviid, S. F.; Breuning‐Madsen, Henrik

doi:10.1080/00167223.2000.10649433

Cited by 1 publication

(1 citation statement)

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“…These dominant SiO 2 species contain structural defects that favor mineral infusion due to underlying conditions and geological processes, such as crystallization, metamorphism, alterations, changes in crystallization temperatures and precipitation [41][42][43]. Au associated with Fe 3 O 4 is mostly formed in skarns of granular magnetite usually found in contact with metamorphosed areas with magma intrusion into carbonate or silico-carbonate rocks that also [45]. The same color of Fe 2 O 3 in comparison with black Fe 3 O 4 makes it difficult to distinguish between the two in branded iron formations and standing water [44,46].…”

Section: X-ray Diffraction Measurementmentioning

confidence: 99%

Characterization and identification of Au pathfinder minerals from an artisanal mine site using X-ray diffraction

2021

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Gold-associated pathfinder minerals have been investigated by identifying host minerals of Au for samples collected from an artisanal mining site near a potential gold mine (Kubi Gold Project) in Dunkwa-On-Offin in the central region of Ghana. We find that for each composition of Au powder (impure) and the residual black hematite/magnetite sand that remains after gold panning, there is a unique set of associated diverse indicator minerals. These indicator minerals are identified as SiO2 (quartz), Fe3O4 (magnetite) and Fe2O3 (hematite), while contributions from pyrite, arsenopyrites, iridosmine, scheelite, tetradymite, garnet, gypsum and other sulfate materials are insignificant. This constitutes a confirmative identification of Au pathfinding minerals in this particular mineralogical area. The findings suggest that X-ray diffraction could also be applied in other mineralogical sites to aid in identifying indicator minerals of Au and the location of ore bodies at reduced environmental and exploration costs.

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