The phrase "a substantial operation" is correct and usable in written English.
It can be used to describe a significant or considerable activity, process, or undertaking, often in a business or technical context.
Example: "The company is planning a substantial operation to expand its manufacturing capabilities in the coming year."
Alternatives: "a significant undertaking" or "a considerable operation."
The clinic remains a substantial operation to this day.
Bata was already a substantial operation at that time.
Correction Appended FROM all appearances, Trek Light Gear is a substantial operation.
"It is a substantial operation, and it has been very professionally executed and carried out," said Hugh Orde, the chief constable.
The deal would also give Anheuser-Busch InBev, already the world's largest brewer, a substantial operation in Africa, where it has little presence, and greater dominance in Latin America.
Although not vast by US standards, Welker Farms is a substantial operation, one famed for its deployment of several Big Bud tractors, which are among the largest agricultural tractors in the world.
Several had undergone major surgery (for example, a hysterectomy, a much more substantial operation than a caesarean section), and 18 had spent some time in high dependency or critical care.
ROME — The two-man workshop close to the Vatican had been busy when tax police raided it last week, seizing about a million religious articles and souvenirs ranging from rosaries to images of Pope John Paul II. "It was a pretty substantial operation," said Lieutenant Colonel Davide Cardia of the Guardia di Finanza in Rome.
Ali had been "part of a very substantial operation engaged in terrorist activity in Afghanistan", he said.
PSNI Chief Superintendent Alan McCrum said: "We put in place last night a considered police operation, a substantial police operation – there were dozens, in fact scores, of police officers deployed there.
Public health is a high profile and substantial operation which deserves a place on the senior management team.
