This minor group comprises underground miners, oil and gas drillers and related occupations, including underground production and development miners; oil and gas well drillers, servicers, testers and related workers. They are employed by coal, metal and non-metallic mineral underground mines; specialized contractors in mine construction, shaft sinking and tunnelling; drilling and well service contractors; petroleum producing companies; and well logging and testing companies.

This minor group comprises logging machinery operators. They are employed by logging companies and contractors.

This minor group comprises fishing vessel masters and fishermen/women. They are usually self-employed owner-operators of fishing vessels. They may also be employed by establishments engaged in operating commercial fishing vessels.