Ont ari O Mining and expl O ra ti O n direct O r y and res O urce guide 20 20 51 Mor e t ha n 50 y ear s of oper a tion in th e drillin g in du stry Cus t omi zed R igs Speciali zed in deep dr il ling helic op t er jobs Air Su ppor t L ogis tics Br a nc hes White Riv er Th un d er Bay R ed Lak e Chibougamau R ouynNor an da Chibou g ama udr il lingsym pa tic oc a T el 4187483977 www chibougamau drillin gca 5 2 7 r out e 1 6 7 C P 4 Chiboug amau QC G8P 2K5 C ase study fr om Nor thern S ask at chew an L ef t Channel 36 dBdt V TEM r esponse R ight Magnet ometric c onduc tivit y and t otal field elec tr omagnetics fr om a G alv anic HeliSAM sur v ey w er e jointly in v er t ed t o pr o vide a highr esolution c onduc tivit y model at the basement c ontac t O v erlain with int erpr et ed c onduc t ors fr om airborne and gr ound EM sur v eys c our tesy of b ingha m g eo P h y sics to ef f ec tiv ely m easur e the full spec t r u m of the ar tifcial w a v ef orm The signals fr om Ear th s sta tic magnetic feld combined with the elec tr om agnet ic feld due to the applied curr ent including t ha t fr om the t r ansmit ting wir e ar e spec tr ally distinc t The y ma y b e separ a ted with the aid of digital signal pr ocessing techniques and pr ocessed to r e mo v e these ef f ec ts and to sample par ts of the w a v ef orm to pr o duce totalfeld magnetometric condu c t ivit y TFMMC totalfeld elec tr omagnetics TFEM and total magnetic in tensit y TMI Galvanic SAM can b e emplo y ed in either airb orne mo de which is suited to r ugged or hea vily f or ested terr ain or gr ound w alking mo de which is suited to open easil y tr a v ersed terr ain Either mo de can r apidly map el ec t rical cur r ent fo w in the r ange of 20 to 200 linekilometr es per da y acquiring highr esolution da t a to a depth of 200 to 300 meters b elo w conduc tiv e r egolith Measur ed conduc tiv it y contr ast can b e associa ted with conduc tiv e miner als dif f er ential w ea thering within shear zones dif f er ent lith ologies lithological contac ts alter a tion zones and r ela ted str uc tur es In gener al TFMMC hi ghs can b e interpr eted as sites of incr eased curr ent fo w in zones of higher conduc tivit y wher eas TFMMC lo w s highlight mor e r esistiv e ar eas Of fsets observ ed in TFMMC tr ends can b e interpr eted to r esult fr om cr osscut ting f aults and str u c t ur es Sw elling along linear f ea tur es can b e interpr eted to b e ar eas of al ter a tion possible sw eet spots al ong st rik e Highr esolution total magnetic intensit y TMI is also a standard deliv er a ble pr o duc t F r e quently str uc tur es contr olling miner aliza tion r e quir e closespaced drilling along and acr oss strik e to pr op erly e valua te f or pot ential economic miner aliza t ion The SAM technique can b e used to mor e accur a tely defne nar r o w zones of conduc tivit y contr ast and ar eas mor e lik ely to cont r ol miner aliza tion and identify the e xtent of k no wn miner aliza tion K e y ad vantages Rapid acquisition 100 to 200 linekilometr es per da y airb orne 10 to 30 linekilometr es per da y w alking mo de