re: drilling was 2005 ... macrae just found a professor of a german university has published several papers about uranium prospect of DD. notice that one paper is published in Technical Document, IAEA.
link see:
http://64.233.167.104/search?q=cache:LWd0eQ7VUl0J:www.uni-koeln.de/math-nat-fak/nukchem/thiel.htm+denny+dalton&hl=en&ct=clnk&cd=1&lr=lang_zh-CN|lang_zh-TW|lang_en