GDX, the gold miner ETF, broke down to its lowest level since September 2009, according to Investors Intelligence analyst Tarquin Coe.

“In doing so a mammoth top is activated but the success of that pattern unleashing its dark side is diminished by the oversold chart condition. The 14 period RSI [relative strength index]on the weekly chart is at its lowest level for three years,” he said in a note Wednesday.

GDX is down about 16% the past month.

Market Vectors Gold Miners

Full disclosure: Tom Lydon’s clients own GLD and SLV.