Dicho, here it is, with Chase's notes. From: Richard Chase, American Folk Tales and Songs (1956; reprinted Dover , 1971, pp. 152-153; with music).

AT THE FOOT OF YONDER MOUNTAIN

This is from the singing of Horton Barker. It is given in John Powell's Five Virginian Folk Songs as recorded by Annabel Morris Buchanan from Miss Lillie Williams of Marion, Virginia.
Mr. Powell says of this song: "Among American songs of this group may be mentioned: 'The Wagoner's Lad,' 'On Top of Old Smoky,' and 'Pretty Saro.' Lucy Broadwood and Anne Gilchrist have written articles which set forth the hypothesis with such logic and insight as to bring conviction that this song is derived from an ancient mystical hymn to the Virgin. They identify its locality with that of Saint Michael's Mount, strangely predominant in Cornish lore since pre-Saxon, even pre-Christian, times."
Related English songs are: "Sweet England," "Come All You Little Streamers," and "Linden Lea." There are related tunes from Scotland and Ireland. (See also, "Clinch Mountain.")

1. At the foot of yonder mountain there runs a clear stream,
At the foot of yonder mountain there lives a fair queen.
She's handsome, she's proper, and her ways are complete;
I ask no better pastime than to be with my sweet.

2. But why she won't have me I well understand:
She wants some freeholder and I have no land.
I cannot maintain her on silver and gold,
And all the other fine things that my love's house should hold.

3. Oh I wish I were a penman and could write a fine hand!
I would write my love a letter from this distant land.
I'd send it by the waters just for to let her know
That I think of Pretty Mary wherever I go.

4. Oh I wish I were a bird and had wings and could fly,
It's to my love's dwelling this night I'd draw nigh.
I'd sit in her window all night long and cry
That for love of Pretty Mary I gladly would die.

~Masato