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Three-dimensional distributed DC/IP method for altered tectonite-type gold ore deposits exploration: a case study of the Jiaojia gold metallogenic belt, Eastern China

Yan J., Zhang Y., Zhang K., Zhang Y., Hu H., Wang Z.

Acta Geophysica

2018

Vol. 66, no. 4

541--557

To develop an effective method to identify ore-controlling faults, we studied the Jiaojia gold metallogenic belt, a most typical altered tectonite-type gold metallogenic belt in the Jiaodong Peninsula, China, and conducted experiments using the 3D distributed direct current-induced polarization (DC/IP) method. Firstly, we tested the ability of using 3D distributed DC/IP method to identify altered tectonite-type gold ore deposits by 3D synthetic modelling. We then collected real data of the Sizhuang gold deposit using the 3D distributed DC/IP method. The resistivity model obtained of this region is generally consistent with the known geological setting. Moreover, to obtain the information about the southern extension of the Jiaojia gold metallogenic belt, we conducted a 3D distributed DC/IP experiment in the Shijia area in the southern segment of the Jiaojia fault. The southern extension of the Jiaojia fault and tectonic evolution of shallow magma in this region were inferred from the 3D resistivity and chargeability models. Based on all the information above, we concluded that the 3D distributed DC/IP method has the advantages of 3D observations, high spatial resolution and great detection depth and will be one of the most effective methods for detecting altered tectonite-type gold ore deposits.

Epitermalne złoża złota i srebra w okolicy Orcopampa i Caylloma, południowe Peru

Paulo A., Gałaś A.

Przegląd Geologiczny

2005

Vol. 53, nr 8

639--648

Many precious metal deposits were recently found and developed within south Peru, adding significantly to the growing position of the country in the world mining. Epither-mal gold and silver mineralization is bound to Central Andean Volcanic Zone, Neogene in age. Precious metals mines are developed at the altitudes of 3200 to 5200 m a.s.l. Structure, host rock alteration, mineral assemblage, grades, metal production and perspectives for Caylloma, Suyckutambo, Madrigal, Arcata, Ares, Orcopampa, and Chipmo districts, as well as for Poracota manto prospect are described. Most of the veins represent low sulphidation type.