The previous research used geomagnetic method on 36 sample located in Mataram with radius 5x5
kms2, have resulted isogram map that clearly indicated extreme magnetic dipole of 70.383,4nT
(03535 '05, 34 " LS ll6`§07?22,8"BT at Karang Kemong) and -26_395,5m" (0ti*'37't5,2" LS
l l 6° 05 'l L6 "BT at Asrama Haji, Jalan Lingkar Selatan). This value has been corrected with IGRF of
45.000nT1 This paper will report the results of advance research to identify the sources of the extreme
geomagnetic anomaly. The method used in this research is making a comparison between geomagnetic
anomaly value and gravity anomaly value (Bouguer anomaly); also the values of geomagnetic anomaly
recorded in several places that have been predicted or proven had mineral/ores potency Besides that, a
geologic prediction will be made based on geo-electric survey at center of positive and negative anomaly.
This research shows that there is correlation between low Bouguer anomaly (l40mGaU and positive
geomagnetic anomaly (70.3 83, 4nT), in the other hand high Bouguer anomaly (1 50mGaU correlated with
positive geomagnetic anomaly (-26.395,5nD. Besides that, the value of geomagnetic anomaly in
Mataram higher than those of other locations that have been predicted or proven had mineral/ores
potency. Geo-electric method applied on bath maximum points of anomaly give a result that the most
probable source of geomagnetic anomaly in Mataram is substructure that contains much fresh water
(highly productive aquifer) or specific stricture of stone with magnetic property that must be studied
intensively.
