ETERNAL FIRE OF MITRE AND FAN-YAGNOBI COAL FIRE
A hypothesis is advanced on a connection of Zoroastrism with mining production cults. Based on the analysis of hundreds of historical records and author's own expeditionary experience, a conclusion is made that the origin of the main ritual of Zoroastrism may be directly connected with the ammonium chloride mining cult in the territories of a thermal discharge.