A minor triad consists of the root, the flattened 3rd, and the 5th. There are six possible permutations of those three notes as listed in the table below. Three of the permutations place the notes on adjacent strings, the other three place the notes on every second string.
If we add the 7th, and allow other extensions as well, the number of combinations is huge. Below are some selected examples of minor chord voicings (listen to the chords in mp3 format).
Since the chord furthest to the right contains the b7 but no 3rd (voicing 1-5-b7-11) it can also be considered a suspended dominant chord. The 11th, which is two semitones above the flattened 3rd, is often used in minor chords. In major and dominant, however, where the 11th is one semitone above the 3rd it is usually notated as 'sus', 'sus4', or 'sus7', short for 'suspended'.