Logistic model applied to geophysical data for sulphide nickel exploration

CIM Bulletin, Vol. 73, No. 824, 1980

R. SIMARD, Institut de Géophysique Université de Lausanne Lausanne, Switzerland

Conventional exploration strategies identify many mineral deposits as potentially interesting, although only a few of them turn out to be of economic importance. In the context of exploration for sulphide nickel deposits in the Canadian Shield, a decisional model, based on a statistical study of parameters relative to nickel deposits as well as to barren sulphide oc-curences, has been developed.Because such geophysical variables as gravimetry, aeromagnetism and topography could be related to the relative importance of nickel-bearing deposits, a statistical analysis of 13 such variables was carried out for 98 targets which were considered promising after conventional exploration. Among these 98 targets are 36 sulphide nickel deposits in the Canadian Shield and 62 drill-tested non-economic occurrences. The results of this study led to the development of a linear logistic model that permits evaluation, for each of the targets, of the probability of finding a nickel deposit of potential commercial interest. This decisional model can thus complement conventional exploration strategies.
Keywords: Exploration, Geophysical exploration, Nickel deposits, Logistic models, Geostatistics, Sampling.