BILLINGS, Mont. — U.S. Interior Secretary Ryan Zinke has closely followed his boss’ playbook, encouraging mining and drilling on public lands and reducing the size of national monuments that President Donald Trump called a “massive land grab” by his Democratic predecessors. Except, that is, in Montana. In Zinke’s home state, the former congressman who has long harbored higher political ambitions is recommending Trump create a new national monument out of the forests bordering Glacier National Park, to the disappointment of a company that wants to drill for natural gas there. A couple hundred miles away, where rocky bluffs line the Missouri River, he decided to leave intact a 590-square-mile (1,528-square-kilometer) monument that for 16 years has stirred the kind of impassioned local opposition that Zinke cited in justifying changes to monuments elsewhere. And he wants to curb mining along Montana’s border with Yellowstone National Park.