be used in addition to steam other sources of heat or energy or both may be utilized for example electrical heating to provide a hot zone where the bitumen or heavy oil is mobilized for the purpose of implementation of the invention the method may include the following steps determine the data similar to table 1 for the planned temperature and pressure of the hot zone for example by means of a suitable water quality modeling software solmineq by the alberta research council or equivalent calculate the expected baseline carbon dioxide concentration without any suppression e g no gas injection for example by means of the method of thimm journal of canadian petroleum technology vol 40 11 pp 50 53 november 2001 or from existing production data of comparable reservoirs estimate the gas production and produced gas composition select a desired reduction in the rock dissolution effect to a level that is tolerable either by prediction or from data acquired from experience or laboratory experimentation and select a gas and a gas injection rate and or other suppression method discussed herein that will reduce the rock dissolution effect to the selected level during production it will be important to frequently measure and analyze the produced water and produced gas to monitor the production and adjust gas injection accordingly the use of a model such as solmineq is recommended to help evaluate the field data in the preceding description for purposes of explanation numerous details are set forth in order.