Had a quick look at Signature Metals.
How much cash are they holding and will they need more to complete the feasibility study? I can see a figure of $3m in a brokers report in November 2009 (page 6 of their latest presentation).
More links to Australian listed gold explorers in Africa
In Ghana:-
Azumah Resources (AZM)
http://www.brr.com.au/asx/AZM/azumah-resources-limited/
Perseus Mining (PRU)*
http://www.brr.com.au/asx/PRU/perseus-mining-limited/
*also in Cote d'Ivoire
Adamus Resources (ADU)...
