By Wendy Corr, Cowboy State Daily A company that operates sawmills in the Black Hills of South Dakota and Wyoming is finding itself unable to take advantage of the increased demand for its product because of shortages in available timber. The shortage has become so acute that Neiman Enterprises has been forced to close its Hill City, South Dakota, sawmill effective Friday. “We have enough material to run the (company’s other sawmills) for now,” said Mike Stevens, sales manager for Neiman Enterprises. “But the volume of material that the Forest Service wants to put up for sale is still well below what we normally purchase, and they have been ratcheting down the amount of material that we can buy for years. This by far is the worst year that we’ve ever seen.”