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(Chris Detrick | Tribune file photo) Trucks line up to receive coal at Sufco Mine, which is seeking to tap the Greens Hollow tract on adjacent Forest Service land in Sevier County. The mine, Utah's longest operating and most prolific, needs to lease this tract, which would yield 57 million tons, to keep operating and feeding Emery County power plants.
Utah’s oldest coal mine aims to expand into an uncertain future

Energy » Sufco hopes to extend life by 9 years tapping Greens Hollow in Sevier County, as Forest Service is finally ready to approve a long-delayed sale.

First Published Mar 17 2014 11:03 am • Last Updated Mar 17 2014 09:48 pm

After two years of "supplemental" study, the U.S. Forest Service has issued a new environmental review of a proposed coal lease that could keep Utah’s oldest and most productive mine operating for an additional nine years.

The Sufco Mine has been pulling high-quality coal from under the southern Wasatch Plateau since 1941 and has been a crucial economic driver for Sevier and Emery counties. The mine operates on the Sevier side of the county line, about 30 miles southeast of Salina.

At a glance

Greens Hollow coal tract

This proposed federal coal lease would make about 56 million tons available for extraction to the northwest of the Sufco Mine in Sevier County.

The Fishlake National Forest has released a draft supplemental Environmental Impact Statement on the 6,175-acre project. The public has until April 28 to submit comments to the forest service offices at 115 E. 900 North, Richfield, UT 84701

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The Greens Hollow lease is needed to feed the mine’s future operations, which could otherwise run out of coal to mine as early as next year, according to the 415-page draft Environmental Impact Statement (EIS).

"It’s an extension of what we’ve been doing versus shutting down," said Ken May, the mine’s general manager. "It’s perpetuating energy development and protecting jobs."

The EIS looks favorably on pulling more coal from under Fishlake and Manti-LaSal national forests, but it proposes requiring the mine to take steps protect sage grouse habitat, water, roadless lands and other non-energy resources. It also proposes allowing only room-and-pillar mining over part of the lease area to protect perennial streams from subsidence associated with longwall mining, according to Marianne Orton, environmental coordinator for Fishlake National Forest.

The Forest Service released the review Friday and opened a public comment period through April 28.

The Greens Hollow project area covers 6,175 acres to the northwest of Sufco’s current operations and would yield 56.6 million tons of coal, generating $194 million in royalties and tax revenues.

Two years ago the Forest Service approved the lease, which would be administered by the Bureau of Land Management. But after environmentalists appealed, Fishlake’s Forest Supervisor Allen Rowley withdrew the decision and initiated the supplemental review. Critics argued the first decision failed to adequately protect sage grouse, a candidate for listing as an endangered species, and roadless areas.

Operations had already permanently reduced North Fork Box Creek, according to the Grand Canyon Trust’s Mary O’Brien.

But May said his underground mine results in few surface impacts.

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"We are more concerned about the environment than anyone from outside the area," May said. "We live here and recreate here. We don’t want to do anything to disrupt the local environment."

A rich but dwindling seam » Sufco would access Greens Hollow coal from existing underground longwall operations that mine coal in sliced panels, tapping in new ventilation shafts as they progress.

But May cautioned the lease would be subject to competitive bidding and another operator could win it.

Sufco produces low-sulphur bituminous coal, most of which is burned in the 1,138-megawatt Hunter power plant in Castle Dale and two other plants in Carbon and Emery counties. Rocky Mountain Power has contracted to purchase up to 4.5 million tons of Sufco coal a year through 2020, according to utility spokesman Dave Eskelsen.

Over the past seven decades the mine has yielded 170 million tons from the Hiawatha coal bed. The seam, up to 14 feet thick, is part of the Blackhawk Formation, laid down in late Cretaceous Period 75 million years ago when fecund swamps covered what is now the Wasatch Plateau.

Deep rich layers of peat accumulated in these bogs and was compressed into hydrocarbon deposits that pack more than 11,000 Btus per pound, according to David Tabet of the Utah Geological Survey. A British thermal unit is the amount of energy needed to heat a pound of water by one degree Fahrenheit.

Sufco has long worked a continuous, flat seam not too far beneath the surface that made for ideal mining conditions.

"They are the highest producer because their coal was thick and more uniform. They could use longwall panels that they wouldn’t have to move as often," Tabet said.

But operations are now stepping down into the lower bed, where mining conditions are trickier and the coal is not as a pure or rich in energy. This is because it formed not in the center of the swamps, but closer to their edges, where streams disgorged sediments that mixed in with the organic material, Tarbet said.

Not only does the coal pack less energy and more ash, but it lies deeper underground, up to 2,500 feet deep at the western end of the Greens Hollow tract. Indeed, Sufco has struggled in recent years to supply coal with sufficient Btu content to satisfy the needs of its biggest customer, triggering a lawsuit filed by Rocky Mountain Power then settled out of court.

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