NOVELTY - Heat from one or more heat sources is provided to at least one portion of a coal formation. The heat is allowed to transfer from one or more heat sources to selected section of the formation. Heat is controlled from the heat source(s) such that an average temperature within at least a majority of selected section of the formation is less than 375degreesC, and a mixture is produced from the formation.    USE - For producing hydrocarbons, hydrogen, synthesis gas, carbon material which is used for steel manufacture, and ammonia which is used for producing urea (claimed). The synthesis gas is used for producing paraffins, methane, methanol, gasoline, diesel fuel and ammonia. The synthesis gas is used as combustion fuel for heating the formation. The synthesis gas is used in energy generation units such as fuel cells.    ADVANTAGE - A mixture of high quality hydrocarbon products, hydrogen and other product, is produced. The hydrocarbons are pyrolyzed within a larger area of portion using fewer heat sources, as spacing between the heat sources is selected to increase the effectiveness of the heat source, thereby economic viability of selected in situ conversion process for hydrocarbon is increased. Uniformity of heat distribution in selected section of the formation is increased. The coal formation is heated economically, using systems having durability. The pressure of hydrogen in produced fluid is controlled, such that large amount of fluids having improved quality is provided. The reducing agent added to formation, reacts with hydrocarbon fragments to form selected products and inhibits production of non-selected products. The porosity of portion(s) of the formation is increased uniformly. The pyrolyzed portion(s) of formation has improved uniform permeability, thereby produces synthesis gas with high recovery efficiency, heating value and desired composition. The formation when cooled, increases strength of rock in the formation and absorptive capacity of the formation. Fluid released to the environment due to the operation of the in situ conversion process, is reduced or eliminated.    DETAILED DESCRIPTION - Heat from one or more heat sources is provided to at least one portion of a coal formation. The heat is allowed to transfer from heat sources to selected section of the formation. Heat is controlled from the heat source(s) such that an average temperature within at least a majority of selected section of the formation is less than 375degreesC such that thermal conductivity of at least a portion of the selected section is greater than about 0.5 W/(mdegreesC), and a mixture is produced from the formation. At least some hydrocarbons are pulverized within the selected section of formation. The selected volume (V) of the formation is heated, and the formation has average heat capacity (Cv). The heating energy per day (Pwr) is given by relation: Pwr = hxVxCvxrhoB, where h is average heating rate of the formation and rhoB is formation bulk density. INDEPENDENT CLAIMS are included for the following:    (1) Treatment of coal formation layer in situ;    (2) In situ method for heating coal formation;    (3) In situ method for producing hydrogen from coal formation;    (4) Formation of heater wells in coal formation;    (5) Installation of heater well in coal formation;    (6) System configured to heat the coal formation;    (7) Condensable mixture produced from portion of coal formation;    (8) In situ production of synthesis gas from coal formation;    (9) Method of forming spent portion of formation within coal formation;    (10) Method of sequestering carbon dioxide within the coal formation;    (11) In situ production of energy from coal formation;    (12) Production of ammonia using coal formation; and    (13) Treatment of hydrocarbon in portion(s) of coal formation.    DESCRIPTION OF DRAWING(S) - The figure is a diagram which depicts the properties of the coal formation.