From The Denver Post (Bruce Finley):
The EPA has stabilized the collapsing mouth of the Gold King Mine, cementing heaps of rock and sediment dug up during mining’s glory days, trying to prevent another blowout and pioneer a solution to the West’s continuing acid metals contamination of coveted water.
And as the feds push through this work, they face once-resistant Colorado communities that are increasingly keen on having a clean watershed.
The action this summer in the mine-scarred mountains above Silverton is raising expectations that, whatever final fix may be made at the Gold King, it will build momentum for dealing with toxic mines elsewhere.
That all depends on Congress lining up funding.
At the Gold King’s timberline portal, an EPA team sprayed gray cement across an area 50 feet high and 30 feet wide to secure entry. Initially, EPA workers crawled into the mine on hands and knees over planks put down to keep them from sinking into orange-hued acid metals muck. They installed cement blocks and a wooden dam to divert a 691 gallons-a-minute toxic discharge…
Then the EPA team welded steel frames 63 feet deep into a cleared 18 foot-wide tunnel. They buttressed the tunnel deeper, another 67 feet in, drilling in expanding screws, steel bolts and grates. They’re pumping that acid metals discharge through a partially buried pipeline that runs 4,000 feet to a temporary waste treatment plant.
At the plant, EPA contractors — mixing in a ton a day of lime to neutralize the 8.3 pH acid flow to 3.5 pH — recently sliced open bulging sacks filled with reddish-brown sludge. They spread 3,500 cubic yards of the sludge across a flat area to dry, trying to extend the plant’s capacity to clean Gold King muck.
Generators rattle. A canary-yellow air tube snakes out the mouth as workers in helmets with head lamps hike in.
Down in town, Silverton and San Juan County leaders’ recent about-face — from a tribe-like mistrust of the EPA toward eagerness to get cleanup done at the Gold King and 46 other sites — is becoming more adamant. Some locals say they see economic benefits if mining’s toxic hangover can be cured. And Silverton’s town manager is broadening his appeal to the nation’s most ambitious geologists to make this a hub for hydrology research…
Next, the EPA must officially designate a National Priority List disaster and find a Superfund or other way to cover cleanup costs — action that’s delayed until fall. Then in the Superfund process, the EPA would start studies to find the best way to fix each of the Animas sites.
At issue is whether final cleanup should rely on water plants, costing up $26 million each, to treat mine drainage perpetually, saddling future generations with huge bills — or aim for a more complicated “bulkhead” plug approach that could contain acid muck inside mountains, perhaps using pressure sensors to give early warning of blowouts…
But Silverton and San Juan County leaders last month said they’re mostly pleased with EPA progress at the mine, though federal muzzling of front-line crews and access restrictions have impeded close-up inspection.
Outstanding issues include locals seek assurances water treatment will continue until final cleanup is done; a demand for reimbursement of $90,000 they spent — “They did pay one tithing, and promised more,” Kuhlman said; and a desire to close off an ore heap used by motorcross riders along the Animas…
A solution based on plugging likely would be controversial. State-backed bulkheads installed near the Gold King Mine “are what started this whole problem,” Commissioner Kuhlman said, referring to the plugs in the American Tunnel of the Sunnyside Mine, which backed up mine muck and doubled discharges from mines in the area — setting up the Gold King blowout. A bulkhead installed in the adjacent Red and Bonita Mine hasn’t been closed.
The appeal is that holding water inside mountains means the acidic muck, which forms when natural water leaches minerals exposed by mining, does less harm.