Abstract: Present invention describes a biotechnological procedure to remove magnetic sulfur impurities from iron concentrate, wherein includes: to bioleach iron concentrate ores agglomerated in heaps under temperature condition between 5 and 35° C., inoculating the iron concentrate ores with Acidithiobacillus thiooxidans cultures, with an inoculum concentration 104 and 106 cel/g and addition of water supplemented with nitrogen and phosphorous source (0.01 to 0.5 g (NH4)2HPO4/L), without potassium addition, adjusting pH between 1.0 and 9.0, and a feeding rate between 5 and 15 L/h/m2; this procedure allows a removal efficiency above 80% in 21 days, with a maximum iron loss of 3%.

Abstract: Present invention describes a biotechnological procedure to remove magnetic sulfur impurities from iron concentrate, wherein includes: to bioleach iron concentrate ores agglomerated in heaps under temperature condition between 5 and 35° C., inoculating the iron concentrate ores with Acidithiobacillus thiooxidans cultures, with an inoculum concentration 104 and 106 cel/g and addition of water supplemented with nitrogen and phosphorous source (0.01 to 0.5 g (NH4)2HPO4/L), without potassium addition, adjusting pH between 1.0 and 9.0, and a feeding rate between 5 and 15 L/h/m2; this procedure allows a removal efficiency above 80% in 21 days, with a maximum iron loss of 3%.

Abstract: Present invention describes a biotechnological procedure to remove magnetic sulfur impurities from iron concentrate, CHARACTERIZED because it includes: to bioleach iron concentrate ores agglomerated in heaps under temperature condition between 5 and 35° C., inoculating the iron concentrate ores with Acidithiobacillus thiooxidans cultures, with an inoculum concentration 104 and 106 cel/g and addition of water supplemented with nitrogen and phosphorous source (0.01 to 0.5 g (NH4)2HPO4/L), without potassium addition, adjusting pH between 1.0 and 9.0, and a feeding rate between 5 and 15 L/h/m2; this procedure allows a removal efficiency above 80% in 21 days, with a maximum iron loss of 3%.

Abstract: The invention relates to a bacterial strain isolated from the species Sulfobacillus thermosulfidooxidans, named Cutipay, deposited in the DSMZ (under the denomination DSM 27601 on July the 29th, 2013); This strain is useful in mining bioleaching processes, as it is highly resistant to the toxic element chloride ion. The invention also relates to a bacterial inoculum to be used in the leaching of metal sulfide ores or metal concentrates, comprising Sulfobacillus thermosulfidooxidans DSM 27601 strain Cutipay; and a method for bioleaching of ores where an ore is provided, which is selected from a metal sulfide ore or metal concentrate. Said ore is subsequently inoculated with the bacterial inoculum of the invention, and maintained at a pH of between 1 and 4, and at a temperature of between 10 and 60° C.