I wrote down the chords to let you play the whole song although if you don't have the 
necessary skills to do it on the Nick Drake's way to play guitar. It could be a start. So:

STANDARD TUNING: EADGBE
KEY: E
CAPO: 2nd fret
INTRO: E

 E
Old black mountain

Tried to spit in your face
 A
Old black mountain
                       E
Tried to spit in your face
 B7
Babys grubbing whiskey
 A               E
Oh she's practising

IT'S THE SAME FOR THE WHOLE SONG

 E
Old black mountain

Mean as they can be
 A
Old black mountain
                 E
Mean as they can be
 B7
They use ground butter
 A                   E
Just to sweeten the tea

Had a girl in black mountain
Sweetest girl in town
Had a girl in black mountain
Sweetest girl in town
But she met a sweet black man
Then she threw me down

Well, old black mountain
Can't keep man in jail
Well, old black mountain
Can't keep man in jail
Sure to call him guilty
Judge will cry and bail

I'm bound for black mountain
Me and my razor and my gun
I'm bound for black mountain
Me and my razor and my gun
Gonna cut her if she stands there
And shoot her if she runs