Today, we take a look at the minor league depth at second base.  Second base for the Mets is still an unsettled position, but luckily, not because of a lack of candidates. Justin Turner has shown that he can be a major league second baseman, Daniel Murphy is also an adequate option, and Ruben Tejada is also a legitimate possibility under the right circumstances. Even with those guys as the prime candidates, second base is a position where the Mets do have players in the upper levels of the farm system.Josh Satin may now be considered another option. He got his long awaited promotion to AAA in August, and then was promoted to the big leagues in September, after proving he could hit at every level of the minor leagues. However, as a big league second baseman, he would be below average defensively, and may be better suited in a utility role. Jordany Valdespin is another guy who is on the 40-man roster and could become a major league second baseman, although he also plays shortstop, and whether or not he’ll become a big leaguer is still much in question for reasons beyond his physical tools.Reese Havens is the guy Mets fans have been waiting for to become the everyday second baseman, and while he has the talent, his development has continually been held up by injuries. If Havens can ever stay healthy for long periods of time, he should be able to show that he is the best candidate for the job, even with so many other guys vying for the position.A little lower in the organization the Mets have a guy to watch in Robbie Shields, a third-round pick in 2009. Shields has been slow to progress because of Tommy John surgery, and began the transition from shortstop to second base this past year just as he was promoted to St. Lucie. Once at St. Lucie he ended up back on the disabled list after 20 games, which halted his progression. Shields is an intriguing guy to watch, especially if he can remain healthy for a full season.One of the Mets 2011 draft picks that made a name for himself right away is Daniel Muno. Muno has played shortstop, but is a player who will have to move to second base in order to progress through the system. He is not a flashy player, but he plays hard and he plays winning baseball. He is certainly the type of player you want to have in your organization.Clearly, second base is a rather top heavy position for the Mets with a lot of guys who bring different things to the table, but none of whom are the obvious choice to be the second baseman of the future. Younger guys will continue adding themselves to the mix from the upper levels of the farm system, which creates a bit of a logjam, but at some point something will have to give. At the moment, there isn’t all too much brewing in the lower levels, which isn’t a big deal with so many options towards the top.