Looks like the place you embarked on just doesn't have those metals. If you're willing to generate a world using the advanced generator and mess around with the world gen parameters, there's a setting that allows you to decide how rare you want mineral veins and other such nice things to be.
As for what you can do for now, if poking around a little more doesn't yield any other metals, I suggest you set up a metalworking industry and get to making some gold crafts. You can use that to trade for some equipment from the caravans, and with some military set up you'll be able to just murder whoever attacks you and steal their stuff. Don't like what that nets you? Melt it down, and reshape it in the image of what you desire!
If engaging in military nonsense sounds too risky, you can always set up cage traps around the entrance to your fort. Unless whoever's coming to get you is a kobold, they'll be caught and you can then steal their stuff. Don't like that, melt it down, nurture god complex, etc., etc.
A more cheatery solution is to modify the reaction raws for your regional save. These can by following this path: (df folder)\data\save\region(whatever number this is for you)\raw\objects. The file you want to manipulate is reaction_smelter. You can modify any existing reaction and it'll start working the way you change it, but you can't add any new ones. Anyway, pick a relatively useless reaction (I personally go for billon, because what the heck is that?), remove the reagent line, and change the XXX in this part [PRODUCT:100:2:BAR:NO_SUBTYPE:METAL:XXX] to whatever you want it to spit out. To find a list of what metals are available, look for inorganic_metal in the same folder. The specifics in this method assume you're using unmodded DF, but even if you aren't the concept is the same.
If any of this was helpful, I'm glad I could help. If you'd like some further explanation, feel free to ask. Gotta stave of sleep somehow, amirite?