Analysis on the ore-controlling structures and prospecting in the Dayingezhuang gold deposit, Zhaoyuan, Shandong Province

This paper is the result of mineral exploration engineering.

Objective The Dayingezhuang gold deposit (explored Au 283 t, Ag 397 t) is located in the middle of Zhaoping fault zone which consist of the Zhaoping, Dayingezhuang, Nanzhoujia, and Nangou faults. The NEE-striking (20°) Zhaoping fault controls the location and shape of the orebodies. Determining the movement direction of faults can guide the prospecting prediction of Dayingezhuang gold deposit.

Methods In this paper, the kinematic characteristics of main faults are studied by structural analysis method.The Dayinggezhuang, Nanzhoujia, and Nangou faults are post-ore faults and crosscut the Zhaoping fault into four segments. These three faults are NWW-striking, NEE-dipping. The Dayinggezhuang fault crosscut the orebody into two segments. No Ⅰ orebody in the north and No Ⅱ orebody in the south are separated by the Dayinggezhuang fault. In the plan view, the distance of the two orebodies is 300-500 m. In the profile, the orebody has a gentle dip and the distance of the two orebodies increase which suggest that the Dayinggezhuang fault is a normal fault.

Results Owing to the up-to-the down movement, the orebody fall into NE-orientation.

Conclusions In the light of the similar kinematics between the Dayinggezhuang and Nanzhou faults, we infer the northern of the Nanzhou fault is a beneficial prospecting target. With increasing of depth, the secondary faults develop and control the small gold ore shoot. In the plan view, these secondary faults intersect with the main fault at the angle of 10°-20°. In the profile, these secondary faults parallel with the main fault and have a middle steeply-dipping at 45o. These faults also are beneficial prospecting target.