Sn–W deposit of the Mueilha mine is one of many
other Sn–W deposits in the Eastern desert of Egypt that
associated with albite granite. Two forms of Sn–Wmineralizations
are known at the Mueilha Sn-mine area, namely fissure
filling quartz veins and greisen. Cassiterite and/or wolframite,
sheelite, and beryl are the main ore minerals in the greisen and
quartz veins. Subordinate chalcopyrite and supergene malachite
and limonite are also observed in the mineralized veins.
To constrain the P–T conditions of the Sn–W mineralizations,
fluid inclusions trapped in quartz and cassiterite, have been
investigated. The following primary fluid inclusion types
are observed: CO2-rich, two-phase (L+V) aqueous, and
immiscible three-phase (H2O–CO2) inclusions. Low temperature
and low salinity secondary inclusions were also detected
in the studied samples. Microthermometric results revealed
that Sn–W deposition seem to have taken place due to
immiscibility at temperature between 260°C and 340°C, and
estimated pressure between 1.2 to 2.2 kb. Microthermometric
results of fluid inclusions in fluorite from fluorite veins
illustrated that fluorite seems to be deposited due to mixing of
two fluids at minimum temperature 140°C and 180°C, and
estimated minimum pressure at 800 bars.