Sen. Tom Udall stated that the Gold King Mine spill of 2015, which spilled 3 million gallons of acid wastewater into the Animas River watershed, was a key factor in introducing the bill. Sen. Udall introduced the bill as a way to make mine operators responsible for mine spills and stated "We cannot wait for more disasters like the Gold King mine spill for us to act. We cannot continue to do nothing while thousands of abandoned hardrock mines drain toxic metals into our rivers, water supplies, and our drinking water each and every day."