Geological exploration of Mongolia has been extremely inconsistent. From the first regional exploration by Russian explorers of Asia to the present, little more than 51% of the country’s territory has been covered by areal geological surveys in combination with prospecting at a scale of 1:50,000. Regional geological surveys at a scale of 1:200,000, 1:500,000, and 1:1,000,000 cover 100% of the country. An aeromagnetic survey at a scale of 1:200,000 was carried out on 70% of the country and a gravimetric survey at a scale of 1:200,000–1:100,000 covers only large depressions in the south of the country. A medium-scale hydrogeological survey was carried out on 35% of the country. Eastern Mongolia has experienced the most recent and comprehensive exploration for uranium resources.