Mineral Prediction Of Gold Deposits From Mo He To Han Jiayuan Area In Heilongjiang Province

The area from Mo He to Han Jianyuan is loated at the most north of Heilongjiangprovince, and it belongs to the Greater Khingan Mountains. The area mainly includes MoHe country and Ta He country, and it is one of the important areas of gold mineralresources in Heilongjiang province. Since the1970s, all geochemical surveys have beendone in the area from Mo He to Han Jiayuan, and the geochemical fruitful achievementshave been obtained. There are more than130locations where stream sediment Auanomalies are found. Those locations mainly are close to the known gold deposits, and theconcentration areas of Au anomalies have been formed. In the concentration areas of Auanomalies, the prospecting significances are huge. The mineral survey results of rock golddeposits and the measurement results of the stream sediments show that the rock golddeposits are the dominant deposits of the study area. There are broad prospects for rockgold exploration in the area. So the study area is one of the rock gold prospecting areas.But the exploration of the rock gold deposits is difficult. Based on the previous geologicaldata and information, the main aim of the study is to carry out the mineral resourcesprediction research work, and the rock gold deposits are as the study object. In a word, thisstudy has practical significances.Based on regional geological background of the studyarea, the main task of this study is to interpretate geophysical information, geochemicalinformation and other related informations, and to further study on typical deposits, and tofurther grasp the ore-controlling conditions and metallogenic regularities, and to constructthe comprehensive information mineral prediction model of the study area. This study ishelpful to put forward constructive suggestions for the future work, and it is helpful toprovide reasonable scientific basis for the tactical deployment of regional gold prospectingwork.The main results of this study are shown below.1. The regional geology of the area from Mo He to Han Jiayuan in Heilongjiangprovince is induced and summarized. The work has important geological significance forthe quantitatively predict of the targets of the gold mines.The study area is in the arc basin of Greater Khingan Mountains, and it crosses twoⅢ tectonic units which are Mo He foreland basin and Eergu Na island arc.There arePaleozoic strata and Mesozoic strata, and they are the main strata in the study area. There are a lot of magmatite intrusion activities in Paleoproterozoic, late Cambrian EarlyOrdovician and Mesozoic.There are a lot of tectonic movements in the study area.So thereare many folds and faults which include4ductile deformation tectonic belts and morethan10faults. The number of the NE-trend faults is more than the number of the NW-tren-d faults and the NS-trend faults.2. The geological datas, the geophysical datas and the geochemical datas aresystematically intepretated for the first time. The study has made and the significativegeological informations, the significative geophysical informations, the significativegeochemical informations and the significative remote-sensing informations available.The study focuses on the geophysical datas as the main interpretated objects.According to the longitudinal associations of level derivations,9aeromagnetic inferredfaults and13gravity inferred faults are inferred, and they establish a solid foundation forthe synthesized interpretations of the gravity and magnetic datas. The synthesizedinterpretations of the gravity and magnetic datas show the gravity and magneticcharacteristics, and they deepen the geological study of fault structures in the studyarea.As a result, there are2EW-trend fault tectonic belts,2SN-trend faults,7NE-trendfaults and3EW-trend faults which are inferred. Above all, the faults have multidirectionin the study area, and EW-trend faults and NE-trend faults are in the majority.3. The comprehensive information prospecting model for rock gold mine isconstructed for the first time in the study area. The belt distribution characteristics of rockgold mine are consistent with the EW-trend distribution of paleo Proterozoic strata.Learned from the investigation datas of Shabaosi known deposits, old ditch knowndeposits, the twenty-one station known deposits Baoxing ditch known deposits, Mesozoicstrata are in Jurassic and lower Cretaceous, and they are the ore bearing strata. The spatialrelationship between the known gold mine and the intrusive rock and the gold surveyresults show that the late Cambrian to early Ordovician intrusive rocks and earlyCretaceous intrusive rocks provide favorable conditions for the formation and preservationof gold. By control of the EW-trending faults, three gold belts formed from the north tothe south. The inter section among NE-trend faults, NE-trend faults and EW-trend faults isthe favoralble location of gold mineralization. The faults control the distribution andoutput of gold ore. Based on the above ore controlling conditions, metallogenic regularityis summarized. Yanshannian is the main mineralization stage in the study area. Three goldbelts formed from the north to the south, which are the gold belt from Lao Gou Mountainto the twenty-four station Forest Farm, the gold belt from Wood and Stone mountain to Stone mountain, and the gold belt from Steamed buns mountain to Han Jia Garden.Through the comparative study of characteristics of typical ore deposit, metallogenicgeological environment is deeply analyzed. At last, the regional gold prediction model ofShabaosi type and Mohe County foreland basin is contructed, and the model is associatedwith magma activities.4. The comprehensive information mineral resources prediction method is applied inthe study, and the gold ore prediction is carried out in the gold ore prospective area.Based on informations about mineralization, finding ore and metallogenic conditions,there are43Statistical geological units.Those units are divided, and the drainage basinnetworks diagram is regard as the unit boundary datum.The geological variables areoptimized. Through the analysis of the unit contact degree curves, metallogenic levelcriteria are determined. The gold ore prediction results of the study area are summarized:all known units are identified as Class1, and they are scattered among12knownstatistical geological units. There are6unknown units which are identified as Class1,2unknown units which are identified as Class2,8unknown units which are identified asClass3and7unknown units which are identified as Class4. The gold resourcesdistribution map and the gold resources prediction map of the study area are compiled.Atlast, there are two Metallogenic prospective areas determined, and they are “Thetwenty-one station prospect area” and “Shabaosi prospective area”. The twenty-onestation prospect area belongs to Class A, and Shabaosi prospective area belongs to ClassB.5. The working suggestion deployment diagram is compiled, and it provides powerfulreference for the development of deeply ore prospecting work.On the basis of the above research, the deep prospecting work of periphery area issuggested in four units adjacent to each other of Shabaosi prospective area. There are8units of the twenty-one station prospect area regarded as gold target areas, and2units isthe known units, and3unknown units are evaluated as Class2or above, and2adjacentunits which are evaluated as Class3are regarded as the potential prospecting units.