This chart (ZG Future) ends on 8/2/2013. I think this bubble occurred because of the flash crash and gold being seen as a safe haven when stocks are in trouble. All my indicators confirm a solid downtrend. The only thing I see that might be a problem for this trend is that it is bouncing around the area where the bubble seemed to jump start.. (the very first red arrow on the left.) that being said, it still has a lot of wiggle room to the downside. If you want me to toss in all the "tech talk", just say so.. (I usually try and spare people it.)
Ill edit this and show you the tech bubble as a comparison. (As far as the charts themselves are concerned)
"Flash Crash Gold Bubble"
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Dow Jones "90s Tech Bubble":
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The fan lines, "various angles of attack", are good indication of a bubble. I generally like to see the angles increasing in degrees as the bubble nears it's end with the highest degree being the last major peek up. Also, Increasing volatility as the end nears. This is "fan lines" with my own twist on it.
bonus:
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USD/JPY "Possible" Bubble
Anyways, sorry for turning this thread into a discussion on bubbles.
(All pictures were made by me)