Since the uplift capacity of rock anchors depends upon the overall deformability and the strength of rock mass, the characterization of overall mechanical properties is very important. The authors have made in-situ pull-out tests of rock anchors and the characterization of rock masses at two geologically different sites. Rock types at the respective sites were sandstone and granite. In this article, the authors will first present the results obtained from various investigations for the characterization of rock mass. Then, they will present correlations among geometrical, geophysical and mechanical investigations and discuss their suitability for the characterization of rock masses for rock anchor foundations.