Estimation of iron ore resources integrating diamond and
Estimation of iron ore resources integrating diamond and percussion drillholes Jacques Deraisme Geovariances 49 Ave Franklin Roosevelt Avon 77212 France Marius Strydom Kumba Iron Ore Geosciences Centurion Gate Building 2B 124 Akkerboom Rd Centurion Pretoria 0157 RSA Abstract The technology of percussion drilling is well mastered