37 Extraction of natural resources, namely, extraction of lithium, sodium, potassium, rubidium, cesium, francium, beryllium, magnesium, calcium, strontium, barium, radium, scandium, titanium, vandium, chromium, manganese , iron, cobalt, nickel, copper, yttrium, zirconium, niobium, molybdenum, technetium, ruthenium, rhodium, palladium, silver, hafnium, tantalum, tungsten , rhenium, osmium, iridium, platinum, gold, rutherfordium, dubnium, seaborgium, bohrium, hassium, copernicium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, actinium, thorium, proctactinium, uranium, neptunium , plutonium, americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium, aluminum, zinc, gallium, cadmium, indium, tin , mercury, thallium, lead, bismuth, polonium, lutecium and lawrencium; drilling of wells; Construction supervision of construction projects in the field of researching, exploring, exploiting, surveillance and optimizing natural resource extraction; installation and maintenance of gas pipelines; installing and servicing mining equipment; maintenance and repair of energy generating installations; installing and repairing power generating machines and plants in the nature of wind power plants, hydro power plants, solar power plants and gas power plants; mining extraction