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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 29 th, 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.