It is known for its mineral waters, spa, and the Khoymorski Datsan (Хойморский дацан) Boddhidharma Tibetan Buddhist temple.

[4] On August 9, 1894, the Khoymorsky missionary Chistokhin gave a presentation about the mineral springs at a meeting of the Academic Council of Tomsk State University.

In May, 1920, after the Tunkinsky valley was liberated from Kolchak's White Cossacks, the governor of Irkutsk ordered Arshan to take on the wounded from the Red army.

The main therapeutic factors in the mildly acidic thermal water are carbon, low-mineralized silicates, sulfates, magnesi-hydrocarbons and sulfide silt mud, which are reputed to effectively treat diseases of the metabolism and the digestive, circulatory, respiratory, urinary and endocrine systems.

The waters belong to Class 1 of the classification system of V. A. Alexandrova because of their high carbolic acid gas content.

Although the last eruption was in the Mesozoic era, the volcanoes are not considered completely extinct because of the presence of numerous hot springs.