شناسائي زون هاي پر عيار مس در محدوده اكتشافي كانسار چاه فيروزه از طريق تلفيق داده هاي اكتشافي به روش دمپستر- شفر

چكيده انگليسي :

8 Detecting high grade copper zones in Chah Firoozeh exploratory lease through integrating exploratory evidences using Dempster Shafer approach Mohamad Sagharidouz m sagharidooz@mi iut ac ir September 13 2014 Department of Mining Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Dr Nader Fathianpour fathian@cc iut ac irSupervisor Dr Seyyed Hasan Tabatabaei tabatabaei@cc iut ac irAbstract Although Iran is located on Alpine Himalayan copper belt many regions in Iran are not well exploredyet and only a few occurrences or deposits are known Therefore using knowledge driven methods forintegrating exploratory evidences can be appropriate to detect new deposits One of the well documentedknowledge driven methods known as dempster shafer is based on Dempster s work on the generalization ofBayesian lower and upper probabilities Due to current global economic crisis the quantification ofuncertainty in exploratory data integration and associated risk is becoming increasingly more important inany mineral exploration project The main advantage of dempster shafer theory as compared with other integrating methods is the ability tomodel the uncertainty This approach is capable to be use in different scales In current study the integrationof exploratory evidences is conducted in regional scale followed by local scale on chahfiroozeh porphyrycopper deposit Exploratory data in regional scale include airborne magnetics ASTER multi spectal imagery geochemical stream sample sediments and 1 100000 geological map of Shahr e Babak The data layers inlocal scale encompassing chahfiroozeh porphyry copper deposit include IP RS geophysical data 1 2000 localgeological map plus 42 borehole logged for lithology and alteration throughout Chahfiroozeh area Afterrequired data preprocessing the regional scale data were employed for mapping favorability of porphyrycopper mineralization in north of Shahr e Babak using dempster Shafer approach The obtained favorableareas coincide well with locations of known deposits and copper mineralization indications throughout thestudy area Next the local data were used for detecting favorable mineralization areas to be explored usingfurther complementary drilling Accordingly three locations were proposed for next stage drilling In orderto evaluate the validity of dempster shafer results the fuzzy logic approach in regional scale was performedand the results were compared The favorable areas obtained out of dempster shafer approach suggestedadditional prospects to the north west of study area compared to fuzzy logic opening new exploratory leasefor future exploration programs For validating local scale favorability map the Mo Zn Pb Cu assay data ofdrill core samples were assisted The results were encouraging and well consistent Key Words Porphyry copper deposit Chahfiroozeh Exploratory data integration Dempster Shafer Fuzzy logic

ساغري دوز، محمد

شناسائي زون هاي پر عيار مس در محدوده اكتشافي كانسار چاه فيروزه از طريق تلفيق داده هاي اكتشافي به روش دمپستر- شفر

مس پورفيري , منطق فازي