1030 °C gas was sampled from a periodically pumping-to-venting outlet above lava flow using a Giggenbach bottle.

Chemical and isotopic compositions of 1030 °C volcanic gas and condensate indicate an uncontaminated magmatic source.

Isotopic composition of 690 °C condensate can be explained by exchange between volcanic vapor and atmospheric oxygen.

Elevated Cu and Au in gases are typical for two recent Tolbachik eruptions.