Investors interested in Basic Materials stocks should always be looking to find the best-performing companies in the group. Has Buenaventura (BVN) been one of those stocks this year? A quick glance at the company's year-to-date performance in comparison to the rest of the Basic Materials sector should help us answer this question.Buenaventura is one of 240 individual stocks in the Basic Materials sector. Collectively, these companies sit at #5 in the Zacks Sector Rank. The Zacks Sector Rank gauges the stren ...