Trenches Gravity Research And Its Application Find Lead-zinc Exploration

This paper, based on the "geophysical exploration application and prospecting prediction of high frequency magnetotelluric(EH4), gravity and charging detection technology in Huize-Zhaotong lead and zinc mine ", researches and studies the Gallery gravity measurement from the perspective of gravity prospecting, and studies the effectiveness for tunnel of gravity prospecting according to characteristics of Mou lead-zinc ore.Mou lead-zinc mining in Zhaotong has a long history,and now faces the demand of exploring the deep and concealed lead-zinc ore badies in periphery. Conventional geophysical exploration methods, such as DC (resistivity, IP and charging), induction electrical class (TEM), magnetic and electromagnetic method (EH4, CSAMT) are all mine "iron" and "power" to produce electromagnetic interference effects, the geophysical results are hard to satisfy mine prospecting the needs of production. But for gravity exploration is not affected by electromagnetic interference, as long as the ore body and rock density differenceness, can carry out the premise of gravity prospecting.Mou mine lead-zinc ore bodies buried deeply, surface normal gravity is difficult to obtain ore induced abnormal, so gravity surface into the tunnel construction site. The construction space transfer leads to the anomaly features and the interference factors and its surface gravity is significantly different.This paper studies the features of gravity anomaly and interfering factors, and puts forward the near zone to change and correct ideas of tunnel two, successfully deduced near zone to change formula and the correction formula. At the same time, in Mou lead-zinc mine actual situation, from the forward research (including specimen density characteristics, body weight density of sample characteristics, model of anomaly characteristics) and interference studies (underground chamber interference, interference, interference and vertical horizontal tunnel goaf interference) a comprehensive analysis of the tunnel gravity measurement in lead-zinc mine for Mou exploration of effective application. In field data acquisition the content discussed the tunnel construction method and gravity data process.Forward research that, in predetermined precision Z400 gravimeter can obtain Mou lead-zinc mine of No.1 ore body abnormalities, cannot effectively detectⅡ,Ⅲore belt ore anomaly. Measured data after treatment in No.1 ore body was clear ore-induced anomaly, inⅡ,Ⅲ, ore belt was markedly abnormal, and forward research basically the same.