Application of multivariate regression on magnetic data to determine further drilling site for iron exploration

• Main Authors: Feizi Faranak, Karbalaei-Ramezanali Amir Abbas, Farhadi Sasan
• Format: Article
• Language: English
• Published: De Gruyter 2021-02-01
• Series: Open Geosciences
• Subjects: multivariate regression; mathematical model; drilling; iron exploration; magnetic data
• Online Access: https://doi.org/10.1515/geo-2020-0165

In this study, a new approach of the multivariate regression model has been applied to make a precise mathematical model to determine further drilling for the detailed iron exploration in the Koohbaba area, Northwest of Iran. Furthermore, to figure out the additional drilling locations, the ore length to the total core ratio for the drilled boreholes has been used based on the geophysical exploration dataset. Hence, different regression analyses including linear, cubic, and quadratic models have been applied. In this study, the ore length to the total core ratio of the chosen drilled boreholes has been considered as a dependent variable; besides, the outputs of the magnetic data using the UP10 (10m upward-continuation), RTP (reduction to the pole), and A.S. (analytic signal) techniques have been designated as independent variables. Based on probability value (p-value), coefficients of determination (R 2 and Radj2{R}_{\text{adj}}^{2}), and efficiency formula (EF), the fourth regression model has revealed the best results. The accuracy of the model has been confirmed by the defined ratio of boreholes and demonstrated by four additional drilled boreholes in the study area. Therefore, the results of the regression analysis are reasonable and can be used to determine the additional drilling for the detailed exploration.