Grizzly Gulch New themed area at Hong Kong Disneyland, opening July 14, 2012. Guests enter the era of the California Gold Rush, visiting the boomtown of Grizzly Gulch, founded on August 8, 1888, the luckiest day of the luckiest month of the luckiest year. Towering over the town is Big Grizzly Mountain, standing more than 88 feet tall. Rocketing through the mountain and around the entire land is a multidirectional coaster, Big Grizzly Mountain Runaway Mine Cars, based on the Expedition Everest ride system at Disney’s Animal Kingdom. There is also Geyser Gulch, a water-based play area, and food and beverage offerings at the Lucky Nugget Saloon.