Investors have watched happily as Franco-Nevada (NYSE: FNV) has seen its unusual business structure produce good returns in recent years. The precious metals and energy streaming and royalty specialist has been able to do reasonably well even under tough conditions in the commodities markets. As investors prepare for Franco-Nevada’s fourth-quarter financial report on March 22, they expect a big jump in revenue and earnings from year-ago levels, and they’re hoping for positive signs from the company about its future.