development and extraction of hydrocarbon raw materials; drilling of prospecting, estimating, structural and operating wells; search, exploration and exploitation of oil and gas fields, refinery of oil and gas; transportation and sale of oil, gas and products of their refinery; production and sale of electrical and thermal energy; building of pipelines and pipeline transportation; development and extraction of drilled mineral resource and mineral resource of joint origin, their sale and other activities in compliance with company's charter and valid licenses