From Hard Assets Investor:

As Brad Zigler wrote earlier this week, the new Market Vectors Junior Gold Miners ETF (NYSE Arca: GDXJ) is off to a good start, especially compared with the Market Vectors Gold Miners ETF (NYSE Arca: GDX). But what's really going on under GDXJ's hood?

To understand that, hard-core gold investors must first understand both how GDX and GDXJ differ and where they overlap.

GDX tracks the NYSE Arca Gold Miners Index, an exchange index that understandably limits itself to U.S.-traded equities (including ADRs). GDXJ, on the other hand, is based on a novel index...

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