Banjo Gm chord (Double C)G minor on the 5-string banjo: 2 3 2 5, and 5 more shapes

Frets, string 4 to string 1: 2 3 2 5 (from the 2nd fret)

1. String 4 (C): 2nd fret, index finger (barre), D
2. String 3 (G): 3rd fret, middle finger, B♭
3. String 2 (C): 2nd fret, index finger (barre), D
4. String 1 (D): 5th fret, little finger, G
5. String 5, the short g: open, G, in the chord

Sounds: D B♭ D G  ·  Gm is G, B♭, D (1 · ♭3 · 5)

Found in: C mixolydian (v), G dorian (i), C dorian (v), G minor (i), D minor (iv), C minor (v)

The 5th string: the short g is the root of Gm, so let it ring.

Double C tuning: gCGCD, the short 5th string first, then strings 4 to 1.