| Autor: |
Lohmeier, Stephanie, Gainov, Ramil R., Hodgkin, Andrew |
| Předmět: |
|
| Zdroj: |
Applied Earth Science; Jun2023, Vol. 132 Issue 2, p65-89, 25p |
| Abstrakt: |
Auriferous vein samples of the Angolan M'Popo deposit were characterized by a combination of 2D microscopy and 3D computed tomography (CT) in order to visualize and assess the gold distribution and gold morphology in in situ high-grade gold ore. The 0.1-2.4 m wide hydrothermal quartz veins in the Mesoproterozoic M'Popo granitic complex are composed mainly of quartz and pyrite, minor other sulfides and (visible) gold. The favourable X-ray attenuation/density contrast within this mineral assemblage allows delineation of the gold particle fraction so that gold particles of <0.01-19.95 mm³ in volume have been identified. Statistical analysis reveals that the bulk (~99.98%) of all gold particles belong to the smallest volume classes (≤0.02 mm²) while large particles (>0.5 mm³) are few. The contrast between rounded, compact smaller particles and branched larger ones is clearly expressed in the CT reconstructions while transitions between these reflect a likely continuum in gold mineralization. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
