Based on an analysis of the present situation of solid ore resources, thispaper points out that reconnaissance and ore prospecting task is very heavyin China and that geophysical prospecting has proved to be quite effective inChina in these years. The geophysical technique of China, although somewhatlower in level compared with that abroad, shows its own distinctive featuresand has already reached international level in some aspects.In order to meet the demand of prospecting for concealed deposits, deepblind deposits, deposits not easy to be recognized and deposits of new types,it is necessary to carry forward geophysical prospecting to a new stage, i. e.geophysical prospecting of the second generation. During this stage, advancedmethods and techniques are to be used and objective geologic-geophysicalmodels will be applied to guide train of thought of the whole work. In thisway, geophysical prospecting will be carried out systematically and morecomplicated geological problem call be solved. The paper deals with five aspe-cts of requirements for geophysical prospecting of the second generation andits characteristics.The attainment of the aim of the second-generation geophysical prospe-cting for solid ore resources requires greater progress and breakthrough advan-ce in methods and techniques. The paper suggests twelve topics for futureresearch, which cover three classes: the improvement of the available methods;the study of new prinoiples, methods and parameters;the application of inte-grated methods.

This paper describes the basic theory of apparent magnetization mapping,inversion for apparent magnetization in frequency domain and spatia1 domain,test of theoretical model and application of the apparent magnetizationmapping method in Qinling-Dabashan region.The theory and thod of inversionare strict and it has solved the problem of numerous negative values that existin inversion results obtained by previous workers. The application of thismethod in Qinling-Dabashan region has reached valuable conclusions.

On the basis of mote than230 English and Russian papers or monographsissued in the last 30 years as well as nearly 50 Chinese articles published overthe past 10 years on the inversed problem in g avity and magnetic explora-tion, combined with his practice in the study of the inversed problem, the all-thor expounds the inversed methods in gravity and magnetic exploration cur-rently used both at home and abroad, briefs the readers about the researchsituation in China and foreign countries, and makes a detailed review on achi-evements gained in China in comparison with the research levels abroad.Final-ly, suggestions are put forward concerning some subjects which are worthnoticing in future research work.

Geophysical and geochemical prospecting is faced with a new task, andfor its fulfilment the geodetic survey seems to be a key technique. This pa-per describes the basic principle of the global positioning system and dealswith its advantages relative to the conventional surveying means, indicating.that it should pass into a major tool in geophysical and geochemical geodeticsurvey. Some suggestions are also put forward concerning the further researchand application of this technique.

Researches have been made on paleomagnetism of Early Permian stratain Ili area, Xinjiang, and the results indicate that: 1) during Early Permian,the Ili landmass was stuck on the Eurasian continent through accretion andlinked with the Tarim landmass; 2) after Early Permian, the Ili landmassexperienced large-scale clockwise rotation relative to the northern stableregion of the Eurasian continent.

This paper presents ohe of the borehole 1Pregults gained in the Yangji-shan sulfide type gold deposit on the Middle and 1.oweI Yangtze iron--coppermetallogenic belt. The 1Plogging peIformed at the preliminaIy exploration sta-g9 of the ore distIict not only Pxovided objective and authentic parametersof physical properties(η,ρ)for the inteIpretation of gtound IPanomalies whichtesulted in the l-ationa1 appIaisal of ground IPanomalies, but also discoveredore beds whiC1 had escaped compilation, thus correctly guiding supplementaIyoblique drilling. The surfaop--borehole azimuth survey, in particular, detecteda blind orebody(polarized body)near the borehole, and t11e spatial location,appIoximate depth and attittide of the inferred blind orebody axousing theanomaly are in agreement with the results of drilling. The bore hole inducedpolarization played a satisfactory role in the exploIation of tl1e ore distIictand led us to gain ideal results.

With the setting up of many tall buildings on the soft soil layers in recentyears, pile foundations have been extensively applied. The new technique forlaying foundations requires people to guarantee the quality of every pile and,as a result, a series of economical, rapid and relaible methods for pile founda-tion inspection have been developed. This paper outlines the classification,roles and functions of piles and twelve sorts of pile inspection methods whichinclude theoretical formula, static load, static empirical formula, dynamic for-mula, hammer-blow injection, mechanical impedance, stress wave analysis,hydroelectric effect, ball-blow dynamio inspection, fundamental frequency,acoustic wave and other logging methods and wave velocity dynamic rigidity.The necessity of integrated utilization of various inspection methods is alsopointed out in this paper.

The ZK5 hydrologic borehole(211. 67 m thick) has revealed an oil bed whichis over 70 m in total thickness and belongs to Cretaceous Bayanhua Group(K₁b) .With the ZK5 borehole as the center,the satellite image has a"halo withanomalous hue". Within and outside this halo, the chloroform extracts of soilshow difference in content, and the points with content>50ppm are mainlyconcentrated inside this halo. Geochemical petroleum prospecting has discove-red in the depression four anomalies, of which the No, Ianomaly lies insidethe"halo with anomalous hue". There exist 31 heavy hydrocarbon and heavyhydrocarbon/carbonate anomalous points, which make up 60% of the total ano-malous points (53) in the survey area. The data obtained prove the geoche-mical petroleum prospecting to be effective in Baiyin Dulan depression.

Only a small amount of work has been done concerning the application ofsoil radon vapor survey with natural α-cup method to the appraisal of geo-chemical anomalies formed by gold and polymetallic ore deposits. In order toopen a new field for radon vapor survey and add a new reliable criterion tothe appraisal of geochemical anomalies, we made some preliminary tests in acertain gold anomalous area in Xinjiang belonging to semiarid steppe landscapeand the Jiaolongzhang polymetallic pyrite ore district in Gansu belonging toloessial ravine landscape. The results show that the radon vapor anomaliespinpoint satisfactorily the localities (including the concealed parts) of theknown gold mineralized bodies, and delineate several promising sectors for goldprospecting(one of them have already been verified). This demonstrates thatthe soil radon vapor with natural α-cup method can be used as one of theeffective means for delineating concealed gold mineralizations controlled bystructural fracture zones and, together with other geochemical prospecting me-thods, it may provide reliable information for finding gold-bearing structuralfracture zones. Faint radon vapor anomalies exist over the polymetallic mine-ralized zones and structural fracture zones covered with loess and Tertiary redclay some 20 m in thickness, and this suggests that the soil radon vapor sur-vey with natural α-cup method is effective in search for concealed polyme-tallic mineralizations in the loess region.