Constraining kimberlite geology through integration of geophysical, geological and geochemical methods: A case study of the Mothae kimberlite, northern Lesotho - Galloway, B.; van Coller, B.; Nowicki, T.; Siemans, K.; Hetman, C.; Gurney, J.; Cele, G. (International Kimberlite Conference: Extended Abstracts, 2008)