A fast-moving wildland fire, whipped up by 50-mph winds, tore through 1,800 acres and destroyed seven structures Tuesday at Topaz Ranch Estates.There were no injuries reported Tuesday, and a hiker was rescued from the area by a Douglas County sheriff's deputy after he became trapped by the fast-moving blaze.Gov. Brian Sandoval toured the area after Douglas County commissioners met in a special meeting to declare the fire an emergency.As of 6 p.m. Tuesday, the fire was nowhere near containment.More than 250 personnel were on scene utilizing four air tankers, two helicopters, three bulldozers, four handcrews and several engines and water …