The Gravity And Magnetic Data Processing And Interpretation On The Iron Mine Of Cuihongshan, Heilongjiang Province

As rapid economy development and accelerated modernization progress in ourcountry, the quantity demand for a variety of mineral resources is increasing. How to findmore and better mineral and oil-gas resources as soon as possible is imminent. At the sametime, as gravity and magnetic exploration has a strong ability to distinguish objects ofdifferent densities and magnetic, and the mineral resources is generally different with itssurrounding rock, so the gravity and magnetic exploration applies widely to find mineralresources and identify of geological structures[1].Gravity exploration and geomagnetic exploration is the earliest geophysicalapplications method, it is applied widely to every stages of metal mines, non-metallicmineral exploration[2]. As there are many advantages of these explorations, such as low cost,high efficiency, easy operation, less work restrictions, so, the effects of these explorationsare significant in mineral resource prospecting and the location delineating[3].However, the geological conditions of nature are intricate and complex, and manygeological bodies are irregular, and many parameters of physical property areinhomogenous, even some geological body overlaps others. What’s more, data collected inthe fields is affected by many interference of various factors, such as system error, randomerror, artificial error and so on. These factors make the measurement results become morecomplex and difficult to interpret. Therefore, in order to carry out the geologicalinterpretation from measured data, we need to distinguish abnormal information betweendifferent types at first[4]. How to eliminate the interference in the region of density ormagnetic with weak abnormal information to conclude the boundaries of differentgeological bodies accurately and how to extract weak abnormal information from potentialfield separation, it has become an urgent problem that geophysical workers needed toresolve immediately.I’m very fortunate participating in the project “The Combined Method ofGeophysical and Geochemical Exploration for minerals in Eastern Jilin and Heilongjiang(No.1212011085483)” of the China Geological Survey project “Mineral ResourcePotential Survey and Assessment in Eastern Jilin and Heilongjiang” during my MasterDegree from2010to2011. I have participated in gravity and magnetic field data collectionin many survey areas, so I selected one of the iron mine of Cuihong Mountain,Heilongjiang Province as the study area which has a theoretical and practical significance. The iron-polymetallic of Cuihongshan located in Xunke County, Yichun City,Heilongjiang Province, the local transportation is very convenient. It is a large andcomplex skarn deposit, The scale of iron-rich, molybdenum, tungsten, zinc and so on islarge; The scale of iron-poor, pyrite mine, lead and so on is medium; The scale of coppermine is minority; And silver, cadmium, indium, selenium are accompanying[5]. This depositis rich in resources, the total reserves of about150million tons, this include70milliontons of iron ore,80million tons of other non-ferrous metal mine[6],100,000tons ofmolybdenum reserves,120,000tons of tungsten reserves of,500,000tons of zinc reservesand so on. The potential value of the resources is nearly1000billion. Higher iron minetaste, with an average grade of48%, up to63%. The iron mine is of high grade, averagegrade of48%, up to63%. There are many advantage of this mine, such as, mine body oflarge-scale, good continuity, excellent transportation conditions, and both mine grades andresource utilization value are high[7].First, I have measured gravity and geomagnetic in iron mine of in a proportionally1:10000Cuihong Mountain, Heilongjiang Province and proofread and preprocessed thedata. Then I have processed the data by model testing and laboratory general processingusing software, like reduction to pole, continuation, matching filter separation of deep andshallow field, layered residual anomaly and so on. Finally, I have analysed and interpretedthe results synthetically and inferred the boundaries and major faults of geological body,and given the corresponding recommendation for mine prospecting.