At the 15th annual Union Hill Empire Mine Run, more than 340 elementary and junior high runners competed for precious medals at a state park known for yielding gold. Seventeen Nevada and Placer County schools competed in the mile-long course, featuring several heats based on age groups with medals going to the top 10 finishers from each group. At right: Kyah Montgomery came in first in the fourth-grade girls race. For more photos and video of the event, visit www.TheUnion.com and click on this story. — Photos for The Union by John Hart …