Rocky Mountain PBS

SILVERTON, Colo. — Colorado’s San Juan Mountains are home to about 15,000 abandoned mines, according to Rory Cowie, the president and owner of Alpine Water Resources. Several hundred of these abandoned mines are in need of a cleanup, which is something multiple federal agencies are working on. Cowie refers to these mines as “legacy mines”— mines that are no longer in use.

“They either have draining water that’s of poor quality, or they may have a bunch of mine waste or tailings … near them,” Cowie said. “And so, for the past 25 or 30 years, there’s been efforts to clean up these mines, but there are a lot of them and it takes a lot of funding.”

But Cowie has a low-cost, natural solution in mind: the American beaver.

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The animals also improve water quality. When water sits in beaver-built ponds, it soaks into the ground and the porous earth acts as a filter before the water re-enters the water system down river.

These ponds also help slow the flow of water, which helps with filtering and erosion. “By slowing the water down in some of these tributary headwater areas, it helps to settle out excess sediments and suspended materials that are in the water,” Cowie clarified.

Slowing water flow will also be helpful in the face of climate change. Warmer conditions mean less snowpack and therefore less runoff, leading to dryer rivers in the late summer and fall.

Oh sure beavers can do all that and more,

“By increasing the beaver habitat in these headwaters, we can slow down that and capture the snow melt over a longer period of time in the summer and slowly release it to the rivers. So, by late summer there’s more water in the rivers than there may be now.”

All these functions could help in the long-term, expensive process of mine cleanup.

Many of these abandoned mines could collapse at any time. Dilapidated structures and sediments block mine entrances. Behind these blocked openings, “discolored and metal-laid waters” collect and, eventually, the pressure and water levels could increase enough to push through the blockage and run downstream.

But with a healthy population of beavers, such releases could be captured in pond systems and filtered out before reaching other water systems downstream.

Of course they could, Give us a hard problem to solve.

But the beaver isn’t just a great long-term, cost-effective solution for mining cleanup. Healthier watersheds are also important to economies downstream, whether that be clean water for agriculture or wildlife viewing opportunities for ecotourism. And as long as there is good habitat, beavers will continuously maintain a dam and pond.

“Engineering has been a huge part of how we manage our water. We’ve been building dams and reservoirs and hydropower and bridges and infrastructure for many decades. And when you take a step back, you realize that beavers are nature’s engineers,” Cowie said.

“And I think there’s a lot to be learned from nature’s engineers.”

Oh and here are the recently released nature-based solutions for climate start strategy. in California. Let me know if you’re spotting a theme. I mean honestly, how much good news can anyone take?