RENO, Nev. (AP) — A rural Nevada group is asking a federal judge to block the sale of oil and gas leases it says will be used for hydraulic fracturing, or fracking, and other development that poses a much greater threat to sage grouse, fish and other wildlife than the U.S. government claims.

The Bureau of Land Management concluded in an environmental analysis in February that energy exploration resulting from the sale of the leases would have little or no impact across about 270 square miles of central Nevada’s Lander, Nye and Esmeralda counties.