I have panned near manzanita and creosote that is near washes and have found a little color myself. Gold that has a copper content can have a red tone to it. Alloys with silver and copper in various proportions produce white, yellow, green and red golds. You may also have some flakes of copper. I would take it to a prospecting or mining shop and let someone see it. I frequent Promack stores that are all around in Arizona. Usually, the folks working there are quick to identify fine gold.