G. Herail et al., EMISSION OF GOLD PARTICLES DURING THE MIO CENE EXPLOSIVE VOLCANIC EVENTS OF THE BOLIVIAN ALTIPLANO, Comptes rendus de l'Academie des sciences. Serie 2, Mecanique, physique, chimie, sciences de l'univers, sciences de la terre, 316(10), 1993, pp. 1431-1438
Many recent alluvial deposits of the Altiplano contain detritic gold.
Part of this gold comes from the erosion of well-known primary gold qu
artz veins contained in the Ordovician outcrops. However, detailed stu
dy of the morphology and composition of the detrital gold grains of th
ese placers indicated the presence of gold particles in Miocene ignimb
rites in this region.