Earlier this week TD Securities downgraded the world's second largest primary silver miner Pan American Silver Corp. (TSX: PAA)( NYSE: PAAS ) to "hold" from "buy" because of weaker silver prices. But despite this I remain bullish on the prospects for Pan American Silver, with a range of indicators highlighting silver prices are set to rebound. Let's take a closer look at why it is still a meaningful opportunity for investors to cash in on a rally in silver. Despite recent weakness silver is set to rebound A key pressure on Pan American Silver's share price is the recent decline in the price of silver, with the precious metal down 10% for the year-to-date and a massive 20% from its February 2014 peak. But in stark contrast, Pan American Silver's share price has held up well, softening a mere 1.5% since the start of 2014, which can be attributed to the company's strong fundamentals.