Manufacturing, Manufacturing Plant Apple Valley, CA – Fire at cement plant held in check by sprinkler system May 11, 2016 viking210 A blaze that erupted at a local cement plant injured two firefighters before it was extinguished early Tuesday morning. Apple Valley Fire Protection District Fire Marshal Jason Nailon told the Daily Press the flames took about an hour to extinguish. The fire was believed to have been caused by possible static or dust explosions at the plant, but remains under investigation. Reports of a blaze at a building in the Cemex plant in the 25200 block of Black Mountain Quarry Road were received around 2:30 a.m. Tuesday, authorities said. Nailon said the blaze involved the plant’s alternate fuels that power their kilns, which are made up of wood chips, pistachio shells and tire chippings. It is believed a minor explosion started the blaze, but the building’s sprinkler system kept the fire in check until firefighters arrived. “When we got there, the fire was almost out because of the sprinklers,” Nailon said, “but the rafters appeared to be burning. It turned out to be an accumulation of dust up on the rafters that was still burning.” About 17 to 20 firefighters responded, including four engines from AVFPD and two from the San Bernardino County Fire Department. It took about an hour to bring the fire under control, Nailon said. One firefighter reported an ankle injury while another suffered from heat exhaustion while combating the blaze. Nailon said some Cemex employees were at the site as well, but they reported no injuries. Estimated damages to the building are not yet known, but Nailon said the concrete construction and sprinkler system protected the building from further damage.