... the Middle East, AisaCountries: South Africa, Zambia, Sudan, Iran, South Korea, Costa Rica etc Drilling Ability:Drilling depth: ... projects e.g. prospection, railway, road, port, bridge, water conservancy and hydropower, tunnel, well, industrial and civil construction2 ... Coal mining exploration, Ore exploration3. Small hole diameter water well drilling4. Geothermal pipe-installing for heat pump5. Small ...