I'd settle on the tile between the two oases, the silver and the lake, the city'll grow quickly off the oases and then work the silver mines for gold and production. Later I'd add a Industrial zone on the desert between the two Silvers and a campus in the mountains to the south. It'll be productive pretty soon.
Desert isn't as much of a doomed start in civ 6 as it is in civ 4 since you don't need a lot of pop to be effective