Stopping future blowouts from mine shafts is the toughest of the three goals.
Gold King Mine
Sunnyside Gold Corp. has been resisting attempts made by the Environmental Protection Agency to get the company to pitch in money for the cleanup.
Many mines pose the chronic problem of relentless pollution.
A new study from the Environmental Protection Agency found fish and other aquatic life in the are are not suffering severe or long-lasting damage.
The EPA says it won't release public comments on its interim cleanup plan for mines in southwest Colorado, until a full plan is released.
The lawsuit was filed by 295 people and asks for about $75 million to cover lost crops and other damages.
The EPA said this week it is making progress on reviewing about 380 claims for lost income, fallen property values and other losses.
The 2015 spill sent a yellow-orange plume of toxic heavy metals into rivers in Colorado, New Mexico, Utah and on Native American lands.
The driver was not seriously injured, but about 9 cubic yards of sludge spilled into the water, officials said.
The EPA chose 26 mining sites for interim work to reduce human and environmental risks while a long-term solution is studied.