Thermal oxidation of gold(I) sulfide
Gold is generally extracted by pressure oxidizing a refractory ore such as pyrite or chalcopyrite. They are common sulfide ores where finely divided nanosized gold are present. They are roasted to break the sulfide matrix and recover the metallic gold(Here). These refractory ores are considered low grade ores (where gold% is less) and are therefore roasted to extract the gold (Here).

Critically, the size at which one can efficiently liberate gold from the host mineral of the particle will determine the process to use for optimal gold recovery(Here). Gold(I) sulfide is not considered a refractory ore as because gold is not present in microscopic level and hence are generally not roasted (Here and Here). 

But it is possible to roast gold(I) sulfide at 200-500°C(Here) but the yield will be less as compared to the gold  yielded when it is leached. 

$$\ce{Au2S + O2 -&gt;[200-500°C] 2Au + SO2}$$