Here are the chords to Lost Mine of the Chisos:

          Em
There is a tale of the Big Bend country
Em             C             Am
And I heard it once, so long ago
Am    Bm                Em
By firelight, on the Rio Grande
Em                  Am             Bm
When the moon shone bright on Mexico

Bm      Em
An aged one, an old compadre
Em          C          D
Told this to me, as I to you
D          G                  Em
The desert sun had burned his body
Em                E               Am
But his eyes told me the tale was true

The notation says guitar in A minor, capo up 1 fret. From "If I Were a Word, I'd Be a Song."