BOREHOLE GEOPHYSICAL CHARACTERISTICS OF THE LADY VIOLET NICKEL DEPOSIT, SUDBURY, ONTARIO

Multi-sensor borehole geophysical measurements were acquired at the Lady Violet nickel deposit to determine the geophysical characteristics and physical properties of the mineralization and the host rocks. The host rocks for the nickel ore consist of the Sudbury Igneous Complex (Norite and Sub-Layer Norites) and the Footwall Metasediments. The natural gamma-ray spectral logs are useful in delineating rock units. Other geophysical parameters show distinct and anomalous responses within the mineralization and correlate well with the distribution of the nickel sulphides in the boreholes. The nickel assays correlate well with the heavy element indicator of the spectral gamma-gamma data and attempts have been made to derive the in-situ assay from this logging parameter. The in-situ physical property data, including density, velocity, conductivity, and magnetic susceptibility, provide fundamental information for interpreting ground and airborne geophysical surveys. The poster shows examples of the different geophysical log responses to illustrate the characteristics of this Sudbury-type nickel deposit.