<i>This is from volcanic origin and the one next to it east might be an old very old impact crater there's a difference Jon.</i><br />Why do you think the large crater to the east is impact? As you say, there is a difference, and the differences allow us to distinguish between the two.<br /><i>I know my geology, but only because I mine.</i><br />Cool! I have spent some time in and round mines myself. What do you mine? Do you have your own workings, or do you work for a company?<br /><br /><i>My point being is, that around all these old structures major fractures have occurred, the crater that's dry to the east north east of the wet one is where if you took the time to zoom farther in is where we build now, why?<br />With out access to water cause by the fracturing, you couldn't build there, it allows for easy access to water and creates streams and lakes.</i> <br />Rocks everywhere are fractured and these are often preferentially eroded to form valleys. These control drainage and assist in route planning. But I don’t see how this is germane, sorry.<br /><i>That's no volcanic calderas in my opinion. <br />That looks more like a strike.</i><br /><br />Why? Can you list the criteria you use to differentiate an impact from a caldera? No impact crater has been reported in the area, and it’s a well studied region. Since you seem to know the area can you look at a geology map? It might have more information about the feature.<br /> <br /><i>What went on in this area to bring people to such a remote spot in the wilderness are metals Jon. <br />Silver and Gold which any advanced civilizations would need to get were we are at today electronics.</i><br /><br />OK. Although of course in the Pacific NW of the US trapping and forestry were also major reasons for development.<br /><br /><i>Now the link at Coffee creek and trinity lake where the tailings are at the edge of the lake if you bothered to look in the lake where the digging occurred it cut channels, but not much compared to</i> <div class="Discussion_UserSignature"> <p><em>Whether we become a multi-planet species with unlimited horizons, or are forever confined to Earth will be decided in the twenty-first century amid the vast plains, rugged canyons and lofty mountains of Mars</em> Arthur Clarke</p> </div>