Firefighters in central California were working Tuesday to contain a wildfire near the Nevada border threatening a forest home to the oldest trees in the world, after making good progress on Monday, officials said. The Silver Fire broke out Sunday near Bishop, California, in Inyo County and has burned ‎1,589 acres. It was 50% contained as of Tuesday morning. “The fire still threatens structures, critical infrastructure, watersheds, endangered species, and cultural resources,” the Cal Fire San Bernardino Unit said in a post to social media on Tuesday. Less than 15 miles from the fire, the Ancient Bristlecone Pine Forest contains trees that are more than 4,000 years old. The Patriarch Tree is the world’s largest bristlecone pine tree.