NOVELTY - Mineral fertilizer prepared by fermenting using selected thermophilic micro organisms over an extended period of at least 14 days under aerated static conditions within a mixture to obtain fertilizer having moisture content of less than 4.    USE - As mineral fertilizer.    ADVANTAGE - The mineral fertilizer leaves no residue, is prepared by less time and low energy consuming method, more stable, and prepared without production of sulfuric acid, consumes less space for storage, can be flowed easily as if passed through a spreader on a vehicle or in an airplane, and has low moisture content which reduces shipped weight by 5%.    DETAILED DESCRIPTION - Mineral fertilizer prepared by fermenting using selected thermophilic micro organisms over an extended period of at least 14 days under aerated static conditions within a mixture to obtain fertilizer having moisture content of less than 4%, where the mixture comprises (a) a mineral substrate comprising a previously dried mass of ground particulate mineral chosen from minerals comprising minerals yielding phosphorus (phosphate rock), minerals yielding calcium (limestone), minerals yielding calcium and magnesium (dolomite, serpentine), minerals yielding silicon (serpentine), minerals yielding sulfur (elemental sulfur or a salt including sulfur) and their mixtures, the particulate mineral or minerals having a mean particle diameter of 0.5-2 mm, (b) the mineral optionally being mixed with an amount of a dry supplement chosen from a compound of selenium, sodium chloride and sulfur, (c) undiluted acidic liquid fish nutrient comprising a supply of nutrient for the microorganisms, (d) the liquid fish nutrient being optionally mixed with one or more unhydrated mineral salts chosen from anhydrous copper sulfate, anhydrous cobalt sulfate, anhydrous molybdenum sulfate and an anhydrous zinc salt which forms chelate, and (e) carbohydrate in the form of previously dried sawdust comprising a supply of nutrient for the microorganisms. An INDEPENDENT CLAIM is included for method for preparing the mineral fertilizer, which involves mixing a mass of dried, ground particulate mineral having a mean particle diameter of 0.5-2 mm and chosen from phosphate-rich rock, a limestone, and a magnesium-rich rock including dolomite and serpentine, with liquid fish nutrient, carbohydrate, and selected microorganisms, storing the mass in an aerated bin in an undisturbed state for a period of time, while ensuring that the air used for aeration is dry, allowing an exothermic, microbiological fermentation process under dry, aerobic conditions to occur over a period of time, testing the mass from time to time to ensure that the mass has moisture content of 2-4.9% and maintaining at at least 70 degrees C for at least 24 hours.