Take the metallogenic theory ofmantle branch structure as a guide, according to comp rehensive analysis of geological characteristics, ore formingmaterial source , variety of ore grady and ore forming and ore controlling structure of Shihu gold deposit, we point out that great prospecting potential is existed in deep section and its peripheral area in Shihu gold mining area.
Dazhuangzi gold deposit, which mainly includes gold2bearing altered rock type and gold2bearing quartz vein type, is located in the edge between J iaolai basin and J iaobei terrane. With the p rogress of research in J iaodong and resource ofDazhuangzi gold deposit reducing, it requests analyzing on ore2forming potentiality and p rospecting target. We can find thatmuch resource can be found in surrounding and deepness of Dazhuangzi gold deposit by comp rehensive analysis on its geological characteristics, ore2grade trend and ore2body trend. According to the resource potentiality it can be divided into three p rospecting targets in Dazhuangzi gold deposit, they are lying on the north superficiality and deepness part of known ore2bodywhich is the most importance one, the deepness part and the south deepness part of known ore2bodywhich is the second importance one, meanwhile the superficiality part of known ore2body also need some farther exp loration work.
The study area, which across the eopaleozoic structural belts of continentalmargin of Zhangguangcai 2Taiping ridge and middle J ilin2Yanbian, is a hopeful district of gold mine related toMesozoic acid2intermediate magmatic intrusive activities. There is a big ring structure with 32km in diameter in the central, several line and ring structure are focus on its inner and peripheral. It is p resumed that the structure is caused bymultip le evolution and invasion of the magma from deep magma chamber inMesozoic. Gold deposit often enriched in this area. According to the analysis on the characteristics of deposit distribution, metallogenic geological setting, geochemical anomaly, line and ring structure and alteration information by remote sensing, thirteen gold metallogenic areas are given.
Gold grade data ofDayin’gezhuang gold deposit are analyzed by content2grossmethod to imp ly relationship between fractal characteristics and gold mineralization. Total gold grade can be divided into four distributions, each of which may correspond to one mineralization event. The fractal characteristics p rovides p roof to multistage mineralization and the superpose mineralization of the ore deposit. The content2gross gold fractal dimension of differentmineralization intensity lithologies zone corresponds to theirmineralization intensity. It show that fractal dimension value can indicate the goldmineralization intensity. Contourmap made by gold concentration fractal dimensions of drills shows some regularity which imp lies that there are still ore bodies in dep th of the ore deposit, and the ore bodies p itch NE
The Shabaosi gold deposit inMohe County, Heilongjiang Province, is a large gold deposit. It occurred in the Middle Jurassic continental clastic rock. There are six ore veinswith nearly SN trend in the deposit. The ore bodies are strictly controlled by SN and NNW trend fault and the surrounding rocks and the intrusive rocks are involved in the mineralization. From the study of fluid inclusions, it is concluded that the ore2forming fluid belongs to Ca2 + ( K+ 、Na+ ) 2SO22 4 ( F2、Cl2 ) type,which is characterized by the low salinity (0. 8% ～9. 2% ) , low density (0. 895g/ cm3 ) , alkali (pH: 8. 05～8. 26) , high sulfide, low oxidize (Logfo2 : 239. 4 ～239. 2) and relative reducing environment ( Eh:- 0. 71～ - 0. 68 ). The ore2forming temperature ranges from 200 ～230℃, with p ressure of 40MPa and dep th of 1. 33km. Based on the analysis of Pb, S, C, H and O isotopes and the study ofmicroelements of the gold deposit, it is found that the ore2forming elements are from magma and strata in dep th. The ore2forming fluids are mainly derived from magma in dep th,with a little atmospheric water. The geological and geochemical characteristics of the Shabaosi gold deposit are similar to those of low sulphidation ep ithermal gold deposits in the world, and it belongs to low sulphidation ep ithermal gold deposit.
Daxigou gold deposit is one of the important gold deposits found recently in the northern Heibei Province. Based on p reviouswork, combined with further study of the exp loration data and the field survey to the region, it is confirmed thatDaxigou is a quartz vein-altered rock type gold deposit, with middle scale, mineralization are mainly related to silicification, pyritized and potassium alteration, ore2bodies are directly controlled by NEE trending fault structure zones. According to analysis on surrounding rock and trace elements, Sisotope and H、O isotope of the ore-body, we conclude that the ore-forming materials are originated from metamorphic rocks and magmatic rocks of Hongqiyingzi Group, the fluid is from magmatic water mixed with meteoric water, and heating of ore bodies comes from magma, so we consider the deposit is a typ icalmedium2low dep th and medium-low temperature magmatic hydro thermal type gold deposit.
Based on the geological logging summarized bymany years’exp loration of Caojiabu gold deposit,we introduce its geological characteristics simp ly. From the spatial distribution of ore vein, the form, occurrence and size of orebody, the relation of orebody to host rock, ore textures and structures, ore types, ore mineral and chemical composition,metamorphism and host rock alteration,mineralization stage and ore genesis,we make a comp rehensive discussion of eological characteristics of the deposit, and p reliminary study the genesis of the deposit. We analyze mineralization of he orebody and p rospecting criteria at the same time, and focus on the characteristics of ore2controlling structure. After many years’exp loration of Caojiabu deposit and its Pinglidian ore point,we have new recognization for ore2controlling structure regularies of this type gold deposit, also it p rovides a reasonable p rospectingmethod and theory for p rospecting in dep th and external.
Since 2002, the single point absolute positioning and track hand GPS have been used in field quality con2 rol by Q IGMR during the 1∶50000 stream sediment survey. The channels pointing mistakes caused by using topographic map and other p roblems such as pointing distortion and samp ling random caused by human factors can be avoided. It not only raises the accuracy of field pointing, but also enables the managers to know p rogress in the field and ccuracy of samp ling through Arcview GIS software. The things must be done during positioning as follows: choose roper correction control points; correct the parameters rightly; conformable hand GPS; turn track on.
The content of arsenic and antimony in the p lant samp le are determined by hydride generation atomic fluo escence spectrometry with step2flow injection technology. This paper analyzes influencing factors of determination accuracy, then choosing p roperworking conditions of instrument, reductant concentration, acidity of samp le solution andcarrier liquid. Under the op timal condition, the detection limits of arsenic and antimony are 0. 05 and 0. 06 , p recisionare 0. 4% and 0. 5% , the recoveries of arsenic and antimony are in the ranges of 98%～102% and 96%～104%.
Because of low gold content in ore, the methods of p retreatment, samp le dissolution, separation, enrichment and determination should be adop ted according to the characters of the ore samp les to find the gold out. Aiming t analyzing the gold in the ores of Hunan XinlongMining Co. , L td. in Dongan, we choose the oil of vitriol, concentrated nitric acid, and potassium chlorate to p retreat the samp les, then add aqua regia to decompose them, finally,use thiomichlers ketone spectrophotometry to determinate gold. We can find that the method introduces in this paper is
superior to the others by comparison.
On the p roduction of gold mineral p rocessing, gravity separation iswidely app lied to p rerecovery the coarse grained gold in the grinding-classification process. We realize the more and early recovery of the gold, futher reduce the ore grade of floatation and increase the processing capacity and dressing recovery. Finally, We achieve the reducing of the beneficiation cost and enegy consumption.
We p roposed mining scheme ofmultip le segments shotcrete and rock bolt support comp rehensive shrinkage ethod, according to mining technical condition and mining situation in recent years ofNalin gold deposit in Guangxi.This mine is on trial currently. We p redict it can satisfy p roduction technology requirements of the mine through app lication variety of construction technology, especially for safety operation demand ofmining and outmine aspects, and it
can satify p roduction capacity demand of the mine.
According to the mining p ractice ofWufenglou tungsten2iron ore that used shallow2hole shrinkage method in
the past four years, facing partialmine fragmentation, adap tation to local conditions, we exp lore a p lan that non2p illar
structure coexisteswith p illar structure in the mining. Floor p illar structure uses funnel type running chute supp lemented with the form of partial non2p illar ore drawing, economical and feasible. The mining scheme break the line of traditional p illar and traditional room, meanwhile by using the retrograde style slagminingmethod. The actual scene of
the ore bodywith stone and lean ore reserved for permanent p illar randomly, it imp roved the mining recovery , reduced
the poverty rate of ore effectively, and resolved the technical p roblems of the difficult of recovery p illar. The result is
well p roofed by the p ractice of ore mining in the past year, we obtain the benefits of economic and social.
<2. 1m ×3. 0m ballmill has been installed and app lied in Sanshandao gold mine instead of <1. 5m ×3. 0m ballmill. It p rovides great experience for smallmill exchange bigmill, and p rovides both economy and easy successfully method for transformation of gold concentrate regrinding equipment of old concentrator
Through the concep t of harmonic and EMC characteristics of inverter, we analyze and discuss the harm which is p roduced by the app lication of inverter in the field of industry speed regulation rotational. On this basis, point out the common methods that treat the high harmonic of inverter. It is helpful to popularize the speed regulation technology of inverter and apply it efficiently
As the mining rightmarket has just started, so the law ofmarket is not perfect. Especially, some business shows unordered in the secondary ( attornment) mining rightmarket, because that the trade p rocess obeys the voluntary p rincip le ofmarket economy. We discuss these problems which occurred in the trade p rocess based on the characteristics of the secondary mining rightmarket.
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