In this task, five ordered key facts are given. All the given facts are expressed in natural language. Your job is to generate a story 100 to 1000 words long, that includes all the facts given as input in their order of appearance while expanding upon them to produce a broader, yet coherent, narrative.

Fact1: poker game in back room of cantina includes horse breeder Jim Carey cowboys prospector called stranger in town named and drifter, Fact2: Conversation turns to legendary wagon train carrying gold bars worth huge area of shifting dunes across border in United States, Fact3: horse tripped over old wagon wheel in hills, Fact4: group is joined by Chris Jackson, Fact5: Chris fell in love former rodeo rider Dave Wilson breaking off engagement to Jim
One day in contemporary Mexicali, a poker game in the back room of a cantina includes horse breeder Jim Carey, cowboys Shep and Johnny, a prospector called Old Willy, a stranger in town named Frazee and a drifter, Chalk. Guitar player Josh and bartender Bibbs are kibbitzing. Conversation turns to a legendary wagon train carrying gold bars worth 5 million lost 100 years ago in the Walking Hills, a huge area of shifting dunes across the border in the United States. Johnny, not paying attention, casually mentions how his horse recently tripped over an old wagon wheel in the hills. To keep the discovery a secret, they agree that all of them including Jims man Cleve must join the search for the wagon train. The nine reach the apparent site but all the dunes have shifted since Johnny was there. Bibbs discovers an ox skull and Old Willy an oxen yoke and they begin digging. The group is joined by Chris Jackson, a woman who followed them from Calexico, where she works in a diner. Shep is really former rodeo rider Dave Wilson with whom Chris, herself a rodeo performer, fell in love at a rodeo in Denver, breaking off her engagement to Jim. Dave abruptly disappeared and Chris saw him again in Calexico after he showed up there as Shep, heading for the border. It turns out that Dave Wilson had fled because he accidentally killed a gambler who accused him of cheating at cards. The mans father, King, hired a detective who turns out to be Frazee, and who has been sending signals to King and a posse with a heliograph. Johnny, Chalk and Cleve are also on the run and each believes Frazee is after him. Frazee shoots Johnny during a fight. Jim, told by Johnny that he would rather die than go to prison, has Cleve hide the horses to keep Johnny from being found out if someone goes for help. A wagon is uncovered and tempers flare when no gold is found. Johnny dies right after Frazee admits he watched Chris as hangmans bait, waiting for Dave to show up. A terrible sand storm develops, and Chalk tries to stampede the horses, killing Frazee with his own gun. Jim kills Chalk as he tries to escape. The storm uncovers the entire wagon train. Old Willy finds it, but its empty. Dave decides to turn himself in to the law and Chris, still in love with Dave, rides after him. Jim has a hunch, meanwhile, that the wagons werent entirely empty when Old Willy found it. He is right.