A method to recover gold lost in roaster calcine-leach tailings, due to the formation of cyanide refractory compounds or morphologies during the roasting process. The engine further has a steam generator. The microinstructions are distinct from the results generated by the execution of the microinstructions by the execution pipeline. The address decoder decodes an address signal in response to the aging signal to generate an internal address signal. The sliding member is slidably mounted to the fixing member, and further hinged to the second end of the support member. The apparatus also comprises high-impedance voltage source coupleable to the charge bus and a controller configured to monitor a transfer of charging energy supplied from the high-impedance voltage source to the first energy storage device.