Recovering metal values from geothermal brine

A process for recovering a metal value from geothermal brine comprising:

• (a) introducing donor metallic particles through a wellbore into a geothermal zone which is dominated by hot-pressurized geothermal brine which contains a metal value selected from the group consisting of gold value, silver value, copper value, lead value, tin value and mixtures thereof, said donor metallic particles comprising an effective amount of a donor metal selected from the group consisting of iron, zinc, aluminum and mixtures thereof;
• (b) controlling the particle size and feed rate of said donor metallic particles introduced into said geothermal zone so that from about 5 to about 80% of the weight of said donor metallic particles before their introduction into said wellbore reacts with said hot-pressurized geothermal brine and is replaced by said metal value thereof, thereby forming residual metallic particles which comprise said metal value attached to a remaining part of said donor metallic particles;
• (c) producing a stream of said hot-pressurized geothermal brine containing said residual metallic particles through said wellbore;
• and
• (d) separating said residual metallic particles from said produced stream of hot-pressurized geothermal brine.