"immense treasure" is correct and usable in written English.
You can use it to refer to a very large amount of something or a large number of valuable things that someone possesses. For example: "The shipwreck was said to contain an immense treasure of gold and jewels."
"This place is an immense treasure trove," he exclaimed, leading a visitor into the new $7.5 million Henry Luce III center on the building's fourth floor, an organized version of the city's attic.
Using that molecule, we could provide them with an archive of all our scientific discoveries, our literature, and our immense treasure trove of cat videos.
Hilda reveals that the ship's true purpose is to locate the "Galactic Leyline", a place which popular claims say is a holder of immense treasure, knowledge, and power.
They were always mean and they usually spent their time hiding in caves protecting their immense treasures.
New Ancient Treasures Immense statues and other treasures recovered by archaeologists from the sunken ancient port of Heraklion off the Egyptian coast near Alexandria are to be exhibited in Berlin and Paris, Egypt's Supreme Council of Antiquities announced on Saturday.
"The cost in blood and treasure is immense, and the outcome is unforeseeable.
The first time I visited, the hot new attractions were the Luxor, an immense onyx pyramid, and Treasure Island, a pirate fantasy world replete with lifesize galleons bobbing outside it.
Caserta is one of those weirdly overlooked treasures, an immense Baroque compound designed in the 18th century by Luigi Vanvitelli for the Bourbon king of Naples to rival Versailles.
The immense toll in lives and treasure of Iraq and Afghanistan — wars the country will try to forget rather than memorialize — explains part of the inward turn.
Because the alternative — the immense cost in blood and treasure and reputation of the Bush administration's war on terror — was so appalling.
Beyond the immense cost in blood and treasure, the negative consequences of a proxy war in Syria would be an order of magnitude worse given the nature of the rebel fighters.
