COPX is the first ETF option for a pure-play copper exposure in the equity space. The fund gets this exposure by tracking a market-cap-weighted index that offers broad equity exposure to the global copper mining industry. Although technically a global fund, it has a strong North American exposure. The fund ranks companies according to their average daily trading volume with respect to its exchange over three months. The highest ranked funds are included in the index. The index is rebalanced semi-annually.