�߷ֱ��ʸ߾��ȴŷ���̽����׼ȷ��λΧ���������ı߽硣���������ɹ���������߾��ȴŷ���̽Ϊ�������ý����źź�ˮƽ�����������˴��쳣���ݣ��ڹ���������һ��� 60 �� 100 m������Ϊ 30 ��60 m��ƷλΪ 12% ��19% ( TFe) �ij�ƶ������ƽ���ֵ��ͼ����ȡһ���������������ַ�����������ˮƽ��ȷֱ�Ϊ81 m ��83 m�������ݿ��86 m�����ݿ��75 m ���Ǻϡ��˷���������������ˮƽ�ֱ��ʣ�׼ȷ��λ�˳�ƶ��������Χ�ҵı߽磬ȡ���˽Ϻõ��ҿ�Ч����Ϊ����ͬ����ƶ����̽���ṩ�˻�����

 The magnetic prospecting method with high resolution and precision is used in accurately locating the boundary of the lean iron deposit with its surrounding rocks�� The authors processed the abnormal magnetic data and used analytic signal and horizontal derivative method in the iron deposit of Liangcheng area as an example�� A super lean iron ore was found in the working area which was 60 ��100 m wide by 30 ��60 m deep��with 12% ��19% (TFe) in grade�� The horizontal width of the ore�� Taking a section from the contour map and using these two meth- ods��the authors calculated 81 m and 83 m in horizonal width��which matches the results of the forward (86 m) and inversion models (75 m)�� A higher horizontal resolution was acquired��and the boundary was delineated accu- rately in the results��which provided a new way to explore the lean magnetite deposit in same type��