This paper is the result of mineral exploration engineering.
[Objective]Graphite, characterized by high electronic conductivity, with low resistivity (<10-5Ω.m) and high polarization (>40%). Due to the ultra-low resistance of graphite, "low resistance shielding" is often encountered in the geophysical exploration. Therefore, it is very important to optimize the effective geophysics methods in graphite exploration. [Methods]In this paper, the Zhongba crystalline graphite deposit in Panzhihua, Sichuan Province is selected for forward simulation, and the effectiveness and applicability of spontaneous potential method and broadband electromagnetic method are analyzed for typical deposits. [Results]Following the principle of "from known to unknown", this method has been successfully applied in the Tangjiaping Graphite exploration, which identified in the periphery of Zhongba deposit. It provides an important support for the mineral evaluation in this area. [Conclusions]we proposed a geophysical methods which synthesized the spontaneous potential method and the broadband magnetotelluric sounding method, which can effectively delineate the graphite orebody extension at surface and underground.At the same time,it provides an application demonstration for graphite exploration under similar geological conditions.
Highlights: The forward simulation and test results of known graphite deposits show that the combined geophysical method of spontaneous potential method and broadband magnetotelluric sounding method can effectively delineate the surface range and deep extension of graphite deposit, and can provide a leading basis for later graphite engineering exploration.