The phrase "a separate expedition" is correct and usable in written English.
It can be used when referring to an expedition that is distinct or independent from another one.
Example: "The researchers decided to launch a separate expedition to explore the uncharted territories of the Arctic."
Alternatives: "an independent mission" or "a distinct journey".
An American guide from a separate commercial expedition, Scott Fischer, also died, along with several other climbers, including three Indians, on the Northeast Ridge.
And when they did discover Tiktaalik (after five separate expeditions to Canada), it wasn't much of a surprise: Tiktaalik had the set of characteristics that they had expected to find in such an organism.
Plant materials were collected randomly along existing trails from Royal Belum Forest Reserve in the State of Perak and Gunung Nuang, Langat Forest Reserve in the State of Selangor on two separate expeditions consisting of members of the research team, a taxonomist from Universiti Putra Malaysia and the forest rangers in July 2007.
The marine veterinarian, Carlos Yaipen-Llanos, who is president of the conservation group Orca Peru, said in an interview that necropsies that he and his colleagues performed on three separate expeditions indicated that the dolphins examined were bleeding in their middle ears and had suffered fractures there.
In separate expeditions to Asia, the Americas and Africa – the merchants essentially established their own private fiefdoms taking control over natural resources that belonged to others, dominating local economies and cultures.
In the next decade, inspired partly by that prize money and partly by the general furor in England, thirty-nine separate expeditions set out in search of Franklin and his crew.
Five separate expeditions were dispatched to Alta California in 1769.
Making matters worse, bones from two separate expeditions had been housed in the same area.
The conservation group Orca Peru undertook 30 necropsies from three separate expeditions.
This had trapped the French army in Egypt on the African side of the Mediterranean, and all efforts to reinforce and resupply them had ended in failure, including three separate expeditions by Ganteaume's squadron.
