systematically sumarizes some Flew theories，methods and technology in positioning prognosis of blind gold deposits,points out its developing trend and discusses some related problems.
with the rapid development of microcomputer or microprocessor,the X-ray fluorescence analytical technique has been xtensively used in m any fields.Taking the Guocheng gold deposit of Haiyang areas in Shandong Province as an example,this paper ainly discusses theories,parameters setting,data processing and the application of m ultielements X-ray fluorescence analytical technique in the study of gold deposit.It shows that the multielemental X-ray fluorescence analytical technique is an effective and economical tool in the geological prospecting and exploration.
The east of HunChun in Jilin province is one of the most important gold metallogenetic and producing district.Appling comprehensive information prognosis and gold modern theory of metallogeny,Authors set up the synthetic information model of prospecting gold deposits,and delineated ten geologic units of gold deposits(prospecting gold targets),and determined many geologic variables and their values,and described gold mineral resources of geologic Limits and rationally predicted gold mineral resources by many mathmatical methods.in this district for the first time.Ten geologic units are divided into six I grade units and fourⅡgrade units.The six I grade units are gold-prospecting targest with m iddle or large deposits.Moreover,the geologic units gre interpreted,and we built up the effective course and methods of prospecting gold deposits in the targets．
methods of prospecting gold deposits in the targets.
Gaolong gold deposit faled severely Critical resource，looking for m ineral deposies and increasing resource is terriuely needed.Therefore,The geochemistry characteristic are discassed the geological feature of Gaolang dold deposit,Such as geology of ovebody，Chcmical Composition of mineral,the inclusion of ore,stable isotope,and so on different parts analyses,are studied metallogeny and model of formation,so the author think.It was the mesothermal-Epithermal infiltration and Micro-dissem inated type of gold deposit.This has some guidence for the geological exploration.
The production of placer gold main includes two details which are gold dredger and island concentrator.It makes more golds losses,one is due to some question such as field，digging etc when the dredger mines ore,another due to no adaptation betw een process equipment,technical parameter and ore practice characteristic when ore dressing by dredger and is land concentrator.According to experience of placer gold practice.Mining plan by technical office must be done，recovery on leaks ore and gold above screen with helpful establishment must be harden too.The jigging type dredger process and the concentrator process of classification before separation,adaptes ore characteristic,it is also measures to im proving the recovery of placer gold.
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