Gold Miner ETF Pulls in $400 Million Amid Rally

Gold Miner ETFs have been extremely active in the past couple days on heavy volume and mostly a uni-directional rally. GDX (Market Vectors Gold Miners, Expense Ratio 0.52%) has reeled in nearly $400 million in the past couple days while NUGT (Direxion Daily Gold Miners Bull 3X Shares, Expense Ratio...