Need some additional information to provide details.

What do you know about the liberation size for the barite, galena, silica; and the particle size distribution for various minerals at that grind size?

Would it be possible to do some upgrading using gravity separation?

Is any additional information available on the economic geology of this deposit?

In your question you state that you have PbO.

This mineral could be Anglesite (PbSO4), but not Galena (PbS).

Anglesite is a lead sulphate mineral with the chemical formula PbSO4. It occurs as an oxidation product of primary lead sulphide ore, galena. Anglesite occurs as prismatic orthorhombic crystals and earthy masses, and is isomorphous with barite and Celestine. It contains 74% of lead by mass and therefore has a high specific gravity of 6.3.

Do you know which minerals are in the Orebody?

About liberation size: Barite is liberated in -212+150 micron with 85%. Galena is liberated in -106+75 micron with 81% and Quartz is liberated in -150+106 micron with 82%.

I just do some tests with gravity and flotation methods just for separation of barite and quartz from each other. But not remove of galena.

Carbonation Rocks of lower Cretaceous are the hosted rock of this deposit.

Thanks for your comment, below is the sample XRD:

•Major minerals: Barite, Quartz

•Minor minerals: Galena, goethite, hematite, chlorite and calcite.

•Rare minerals: Chalcopyrite, Pyrite, malachite, Covellite, and clay.

•You should grind the ore a little bit deeper - about 80% bellow 74 microns.

•You should first float galena first e.g. with xanthogenate (100 -200 g/t) at pH about 8-9.

•And only then you should float barite.

Do you think it's economically feasible process for this kind of ore?

That is a standard approach for a selective flotacion of Ba containing Pb-Zn sulphidic ore/ First sulphides out and then BaSO4 flotation with a liquid glass for a depression of Al and Si minerals and calcite.