Lawrence Roulston, Editor of Resource Opportunities, discusses the challenge of identifying a bottom at the 2013 Subscriber Investment Summit in Toronto before the PDAC.Renowned mining industry expert Lawrence Roulston brings you a wealth of mining investment insights in his subscriber supported mining investment newsletter, Resource Opportunities.For More Information, Visit: http://www.resourceopportunities.com/Click here to see the other speakers and companies that attended the Toronto SIS 2013. http://resourcespots.com/toronto-subs...To watch the other video presentations, visit http://www.resourcespots.com