NEWARK, DELAWARE--(Marketwire - Oct. 23, 2012) - The Market Vectors Junior Gold Miners ETF (GDXJ) has climbed about 40% since the summer lows-a potential signal that the exploration side of the precious metals business is coming into its own, after lagging the resurgence in gold and silver prices and the share prices of senior miners. The ETF contains more than 80 small cap and early stage mining companies such as B2Gold Corp., Silvercorp (SVM), and Endeavor (EXK).