manto

CONT: Deux types de gisements sont associés dans le district : stratiformes (ou «manto»), discordants près des roches ignées tertiaires.
CONT: Les corps minéralisés présentent des formes variées : veines, zones de remplacement plus ou moins régulières dans les calcaires («mantos»).

CONT: The large [uranium] deposits form mantos hundreds of metres long, about a hundred metres wide and a few metres thick. They can be mined by open pit or underground methods ...
CONT: A continuum is recognized that extends from endoskarn and reaction skarn at or near the intrusive contact, through exoskarn to more stratigraphically or structurally controlled manto and chimney deposits ... with increasing distance from the intrusion ...