• Hooker’s Trails Expeditions in the year 1994 in collaboration with State Tourism Department, State Forest Department, Zoological Survey of India, Anthropological Survey of India.

• Munsithang, North Sikkim with State Forest Department during the year 1994.

• Lhonak Valley Expedition jointly by KBR Project Staff and Botanical Survey of India, Sikkim Himalayan Regional Centre in 2000.

• Bhimbase-Dokala expedition jointly with State Forest Department, Indian Army and Botanical Survey of India, Sikkim Himalayan Regional Centre in August 2013

• Gyamtsona expedition jointly with State Forest Department and Botanical Survey of India, Sikkim Himalayan Regional Centre in 2013.

• EIA studies completed for Teesta Stage II-North Sikkim; Teesta Stage IV- North Sikkim; Teesta Stage VI-East Sikkim.