NOVELTY - The method comprises providing an aqueous brine solution that comprises silica and an iron (II) salt, oxidizing the iron (II) salt to iron (III) hydroxide, maintaining a pH of the aqueous brine solution at 4.5-5.5, contacting the silica and the iron (III) hydroxide for a time sufficient for the silica to attach to the iron (III) hydroxide and form a silica/iron precipitate, separating the silica/iron precipitate from the aqueous brine solution, recovering an aqueous product stream from the separation step, and supplying the aqueous product stream to two columns charged with activated alumina.    USE - The method is useful for removing silica from an aqueous brine solution such as geothermal brine solution (all claimed), smack over brines, synthetic brines and other brines resulting from oil and gas production.    ADVANTAGE - The method is capable of economically removing the silica and silicates from the geothermal brines with high yield and without the removal of other ions from the brines.    DETAILED DESCRIPTION - The method comprises providing an aqueous brine solution that comprises silica and an iron (II) salt, oxidizing the iron (II) salt to iron (III) hydroxide, maintaining a pH of the aqueous brine solution at 4.9-5.3, contacting the silica and the iron (III) hydroxide for a time sufficient for the silica to attach to the iron (III) hydroxide and form a silica/iron precipitate, separating the silica/iron precipitate from the aqueous brine solution, recovering an aqueous product stream from the separation step, maintaining the pH of an aqueous product stream at 4-7, supplying the aqueous product stream to two columns charged with activated alumina such that silica present in the aqueous product stream selectively binds to the activated alumina, and recovering a column product stream having a silica concentration of less than 5 ppm. The oxidizing step comprises sparging the aqueous brine solution with air for 30 minutes. The aqueous product stream has a reduced silica concentration relative to the aqueous brine solution. The pH of the aqueous brine solution is maintained at a predetermined pH by addition of base (104). The silica concentration of the aqueous product stream is less than 20 ppm. The method further comprises supplying the aqueous product stream to units for recovering a metal consisting of lithium, zinc and manganese from the aqueous brine solution, adding flocculent (110) to the aqueous brine solution, regenerating the column charged with activated alumina, and monitoring the column product stream to determine loading of the column charged with alumina. The molar ratio of iron (III) to silica is 7:1.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of an apparatus for removing silica from silica containing brine.    Base (104)    First mixer (106)    Aqueous base stream (108)    Flocculent (110)    Brine stream. (112)