I've not read much on this specific act of Congress (July 1862 - repealed July 1864) or the proposed venture in "New Granada" until today.
As you may know, a number of books and articles have been written about colonization of ex-slaves/freedmen.
Here's a summary of the colonozation movement in the excellent website slavenorth.com
http://www.slavenorth.com/colonize.htm
Others --
http://philmagness.com/
http://www.uky.edu/Libraries/NKAA/record.php?note_id=1680
http://www.mrlincolnandfreedom.org/inside.asp?ID=34&subjectID=3
http://opinionator.blogs.nytimes.com/2012/08/16/lincolns-panama-plan/
http://www.nytimes.com/1862/10/01/news/negro-colonization-merits-demerits-new-granada-for-pomeroy-colony-extract.html