Death Valley National Parks Wildrose Charcoal Kilns are considered to be the best surviving examples of such kilns in the western United States. The kilns were only used for a short time around 1878 to provide charcoal to power nearby smelters. There are 10 kilns at the site each standing 25 feet tall with a circumfrence of 30 feet. Each kiln was capable of converting 42 cords of pinyon pine logs into 2,000 bushels of charcoal in one weeks time.