Oil-shale mirage still shimmers on W. Slope

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Now the energy giant is back. It's among a handful of companies vying for the latest round of oil-shale leases on federal land in northwest Colorado. The companies want the right to mine for shale inside the tightly bound rock of the Piceance Basin.

Environmental groups have sued the feds to block the leases, citing Bureau of Land Management research documenting the lack of cost-effective and environmentally sound technology.