RE:RE:SXG is breaking out down under......THM is extremely undervalued (trading at about 6% of its all-time highs) and has one of the largest gold projects in the world (over 10 million ounces) in a safe jurisdiction (Alaska). Some very big names are involved in this play: Electrum, Sprott, Paulson, etc.
Discovery Silver (trading at about 30% of all-time highs) has the world's largest silver development project in Mexico. Sprott is involved in this one and I suspect will either be bought out or will become one of the most exciting silver producers.
Southern Silver is a smaller version of Discovery (in terms of price and resource size). However, it also has one of the largest silver projects in the world under development in Mexico.
In terms of upside within my portfolio, these are three names I would recommend. For extra credit, if you want a deep-value play which could take longer to come to fruition, take a look at NCP, they have 7 million ounces of PGMs and have already issued a PFS on their project. Trading a hair over a penny they are literally being given away for nothing (no-brainer at these prices) and they are also in a safe jurisdiction (Yukon).
Happy investing! And, as always, make sure you do your own due diligence prior to taking any positions in any of the juniors being researched.