"With gold closing out the week very strongly (USD1735.30), next week should be a real ripper for IGR and SLR!"
I'd say we've got a good 2-3 years ahead of us based on what the HUI index has done after major declines. If gold goes for a run over $2000 I won't be surprised to see the ratio back to 0.5 or HUI > 1000 over that timeframe:
http://www.321gold.com/editorials/sfs/hubbartt090712.html