$95 billion Brazilian metal miner Vale ( VALE) is another name whose chart hasn't been looking great for the past few months. Vale is down more than 13% on the year, bouncing lower in between downtrending resistance and support levels. But here again is a setup that's actually bullish on further inspection. That's because Vale is forming a falling wedge, a reversal pattern that's formed by downtrending support and resistance levels that are converging. The buy signal in a falling wedge comes on the breakout through resistance -- and with Vale testing resistance this month, that buy signal could be coming sooner rather than later. This is a pattern worth paying attention to. One study puts the pattern's ability to spot a reversal at more than 90%. Obviously, this isn't a setup that you want to get in on early. The buy signal comes on a breakout above the resistance level above shares, but VALE could feasibly fall materially further and remain within the wedge before a breakout does happen. Until resistance gets taken out, keep this name on the back burner.