It can be gold , and probably is , but could also be pyrite....which itself can contain gold. Quartz , gold , and pyrite are often found together. But you probably already know that. Im not saying you have pyrite , just that it can look just like gold in ore and testing can sometimes be the only way to be positive.
Sometimes gold ore just looks like nasty brown colored rocks or quartz. But it can be loaded with elemental gold only seen after processing.
Anyway ,....just talking about it , since it interests me.