Nicolas Roeg, the director of Performance, The Man Who Fell to Earth, and Track 29, has long pursued a blatant obscurity entwined with a reeling grandeur-the bane of marketing mavens. Hence it's not surprising that his epic of elusive wealth was kept in the studio vault for several years before its cinematic treasures were brought to light. What you find in Eureka is Jack McCann (Gene Hackman), a 1920s gold prospector taking a pick to the Klondike's plunder. In the mystical prologue, McCann rails at the forces of nature to bring forth their riches. Twenty years later, he is a tycoon living in splendor on his own Caribbean island. His boundless wealth has brought him little pleasure, save for that of his badly behaved daughter (Theresa Russell), whom he closely guards. Part erotic inquiry, part voodoo hex, Eureka displays great flair for the boldly wrought, ecstatic image. But like Roeg's prospector, you wonder what's left after the ecstasy passes.