Board Thread:Administrator's Noticeboard/@comment-16339125-20140725193331/@comment-7697305-20140725202439

If you want a few examples of what qualities are looked for in potential admins here:
 * High degree of activity for a long period of time
 * Puts a lot of effort into improving the wiki
 * Ideally, knows how and when to use the extra tools that being an admin gives
 * Is able to act as an effective mediator in user/wiki disputes
 * Has the trust of the wiki's community as a whole

The bar is pretty high, and it takes a lot of time and effort. I'd recommend reading this for the rest of the details.