Research Progress in High Power Multi-functional Borehole-Ground Electromagnetic Transmitter for Metal Exploration

Enhancement of transmitting power is an effective way to improve the depth of electrical prospecting. The objective of this method is to provide adequate offset observation in order to minimize source field effect and to reach a deeper depth of exploration. In addition, placement of electrically excited field source underground close to the exploration object and underground is a new prospecting technology in metal exploration. This method is implemented using existing pit, mine or borehole with the purpose of obtaining stronger and improved information on both the exploration depth and the definition of the anomalous body. Therefore, we have developed a transmitter that can be used as the excitation device for artificial electromagnetic source. It uses a type of large power inverse rectangular wave that works in an automatic sweep manner, the frequency of the transmitter signal range between 10 and 0.01 Hz, the maximum transmitter power is 48 KW, the maximum transmitter current is 60 A, it can realize the on-time planned power supply transmitting with the GPS clock and real time clock (RTC), and also record the information of several auxiliary status. We have been able to certify through experiments that the performance of the device is reliable and stable. And that the device can satisfy the demand for electromagnetic prospecting of metal mining, prospecting for deep and concealed ore bodies and the exploration of sustainable resources for solving resource mining crisis.