Hired and trained by the
Geological Survey of India's
Dehradun office, Singh then participated in the
Great Trigonometrical Survey, and later became a trainer for the survey.
James Walker, the superintendent of the survey, took him and his cousin Nain Singh on expeditions of Tibet and Central Asia. He was part of the several important expeditions listed below. • 1869
Kailash-
Mansarovar expedition. • 1871–1872
Shigache–
Lhasa expedition. • 1873–1874
Yarkand–
Kashgar expedition, second expedition of this area by Sir
Thomas Douglas Forsyth. • 1878–1882
Darjeeling–
Lhasa–
Mongolia expedition, stayed in Lhasa for a year masquerading as a merchant, surveyed
Mekong,
Salween, and
Irrawaddy rivers. He was also the first person to map the
Ramgarh crater on a finer scale of (1 : 63,360). ==Retirement and death (1885–1921)==