In virtually all cases, yes. You will detect on several different sites. Each find will be examined, attributed, and dated. During the following years, the rich farmlands to the North became the location of wealthy Roman Villas, Imperial Estates, forts, camps, towns, and soldiers' land grant properties. Each year new artifacts and coins are found due to the farmers plow turning the ground and reaching down into fresh soil.
Luck naturally plays a large part.
The Treasure Trove Committee, over the last 10 years, has recommended more payments to finders of hoards discovered in the Fenlands than any other part of England.