Mineral occurrence for Dachang gold deposit and its impact on gold recovery rate in Qumarleb County,Qinghai

Based on X-ray diffraction,optical microscopy and scanning electron microscopy analysis of the Dachang gold ore,it is showed that the sulfide of ore is the main carrier minerals of gold. A majority of gold is embedded in pyrite and tetrahedrite as the form of inclusion and a small amount intergrowth with pyrite and gangue mineral,occasionally the presence is in form of monomer natural gold. The main factors which influence the recovery rate are sulfide mineral particle size,and the fine grained sulfide is beneficial for the dissociation and flotation of gold bearing minerals. The monomer dissociation degree of gold bearing minerals can reach91. 3%,when the grinding fineness is less than 0. 074 mm and grain level accounts as 80%. It is not conducive to the flotation of sulfide if the grinding fineness is low or high. It is difficult to completely dissociate the monomer if there is a small amount of pyrite and arsenopyrite in the ore. Therefore,before leaching the gold,it must conduct pretreatment to reach the ideal recovery rate of the gold,like roasting oxidation,pressure oxidation and biological oxidation. The fine microscopic gold has little influence on the gold recovery rate.     

胶东下潘格庄金矿床金的赋存状态及控矿构造特征

胶东下潘格庄金矿床为破碎带蚀变岩型金矿,其形成与朱吴断裂的次级断裂——下夼断裂、下潘格庄断裂、上潘格断裂3条断裂带关系密切。下夼断裂带为区内主要断裂带,双山屯、棉花州、韩家夼等中小型矿床均赋存于该断裂带内。断裂围岩为二长花岗岩,蚀变带下盘见有钾化,蚀变带内见有钠长石化、绢云母化、黄铁矿化等蚀变,断裂面上见有灰色、深灰色断层泥,工程揭露断裂面沿走向较连续。下潘格庄金矿床矿物共生组合简单,矿石矿物以黄铁矿为主,次为磁铁矿,并含有少量的黄铜矿、方铅矿、闪锌矿等,矿石矿物含量大于7.00%,属高硫化物型;脉石矿物含量大于90%,主要为石英和绢云母,次为长石、方解石、绿泥石;其中黄铁矿和石英为主要载金矿物。金矿物为银金矿,以包体金和裂隙金为主赋存于其他矿物中,金颗粒以细粒金为主。矿石伴生矿物组合主要为银和硫,矿石属于易碎易选矿石。     

山东旧店金矿金矿物特征及其意义

以山东平度旧店金矿床中金矿物作为研究对象,通过对金矿物的形态、物性、主成分及微量元素等特征的研究,认为旧店金矿中主要金矿物为银金矿、自然金,主要载金矿物为石英、黄铁矿、黄铜矿、方铅矿、闪锌矿等。金主要以银金矿形式产出,金银矿少量,自然金很少。金矿物赋存状态主要为裂隙金、包体金、晶隙金等,呈粒状、板状、针状产出,银金矿与石英、黄铁矿依存关系最为密切。旧店金矿金的成色集中在600～800之间,平均744.13,说明旧店金矿经历了中温成矿环境,且成矿时间较短,是以金石英多金属硫化物阶段为主成矿期。     

Gold Deposition by Boiling or Cooling Without Boiling: Genesis of the Sangchon Gold Deposits, Hadong Area, South Korea

In order to understand the mechanism(s) of gold precipitation in the anorthosite- hosted Sangchon gold deposits in the Hadong area, Korea, chemical speciation and reaction path calculations were accomplished by geochemical modeling.The modeling consisted of three- step procedures: reaction with anorthosite, then the simple cooling of the reacted fluid,and finally the boiling of metalliferous fluid. The principal vein minerals of the Sangchon deposits consist of quartz, sericite,kaolinite, pyrite, galena, chalcopyrite, sphalerite and acanthite. The sulfide mineralization is typically zoned from pyrite (preferentially at vein margins) to galena and sphalerite (toward vein center). Electrum is intimately associated with pyrite + chalcopyrite and sphalerite. By comparing the results of modeling with the observed mineral assemblages and paragenesis,the most appropriate evolution path of ore fluids was suggested as follow: reaction of a single fluid with anorthosite at 300℃,then the isobaric cooling of the fluid at temperatures from 2500° to 100℃3 , and then the boiling and cooling of the fluid due to the decrease of pressure and temperature. Calculations also show that all of the observed alteration minerals formed due to fluid - anorthosite interaction at early period, whereas most of sulfides and electrum were precipitated mainly due to cooling.The abundance of gold in veins depends critically on the ratio of total base metals plus iron to sulfide in the aqueous phase,because gold is transported as Au(HS)2- whose solubility is very sensitive to the sulfide activity. Our results of geochemical modeling generally fit to the observed mineral assemblages and mineral composition, indicating the usefulness of numerical simulation for elucidating the genesis of gold deposits.     

山东省乳山市西涝口金矿床金矿物学特征及其意义

西涝口金矿是胶莱盆地东北缘地区典型的金矿床,该区金矿物以单颗粒的自然金为主,有少量的银金矿.粒度多集中在1～37μm;形态多为星点状、角粒状、圆粒状、细脉状、枝杈状等.主要以包体金、粒间金、裂隙金存在于黄铁矿、石英等颗粒中.化学成分中除含Au和Ag以外,还含有Fe、S、Te、Se、Ni、Co等元素检出,其中Fe、S、T...     

广西丹池矿带中银(金)矿物特征及其赋存状态

丹池矿带中的银(金)矿物有银黝铜矿、辉银矿、深红银矿、辉锑银矿、脆银矿、“丹池矿”(新矿物)、银金矿、锑银矿、方全锑矿和银辉铋矿等10余种。硫化物和硫盐矿物中含次显微银和次显徽金。     

周至马鞍桥金矿床成矿控制条件及找矿标志

马鞍桥金矿床是产于南秦岭泥盆系中的大型微细浸染型金矿，沉积—叠加改造成矿特征典型。矿体沿上泥盆统上部层位稳定分布，多与围岩整合产出。矿石类型有破碎蚀变岩型、蚀变千枚岩型、炭质片岩型和含金石英脉型。矿石构造有浸染状、细脉浸染状、细脉状和角砾状。矿物成分主要为黄铁矿、磁黄铁矿和石英、绢云母等，金主要呈显微金、超显微金分布于矿物粒间或被吸附于矿物表面。矿床由多种地质作用经过多期多阶段形成，主要受构造、沉积地层和岩浆活动控制。区域性大型韧性剪切带控制金矿带、金矿区的展布，地区性二级脆性断裂控制金矿床的范围，局部的更次级层间破碎带、断裂裂隙带控制矿体的就位。含了地层为矿床形成提供了主要的成矿物质。岩浆活动为形成合矿流体提供了热源并是热液运移的主要热动力。     

Metallogenic origin of Sipingshan hot spring gold deposit in Hulin of Heilongjiang and its metallogenic mode

Sipingshan gold deposit is gold-bearing sillcalite in type. There only exist a few kinds of sulfide in the ore and it is lower in content. The gold degree is lower. Au is closely related to the Ag,Cu,Pb,As and Hg elements. The upper sillcalite has Eu and Ce negative anomaly,and the lower sillcalite has Eu positive anomaly. however,the hot spring cemented breccia and rhyolite porphyry have Eu negative anomaly;the S isotope component has deep-seated magmatic sulfur and terrestrial sulfate characteristic;and the Pb isotope has the character of the mixture origin of crust and mantle that is mainly dominated by Pb in the orogenic belt. The ore-forming fluid temperature is 180℃-244℃,characterized by magmatic hydrothermal and meteoric water;and the ore-forming age is 87 Ma. The deposit was formed by the metallogenic fluid in the tectonic fault zone overflowing near the earth’s surface and leading to the metallogenic function and the metallogenic substance deposition.     

广西大庆岭金矿床矿物学特征及找矿意义

黄铁矿和石英是大庆岭金矿的主要载金矿物。对黄铁矿和石英的微量元素及其变化、S/Fe值、晶形、热电导型和石英的化学成分、晶胞参数、热发光、包体爆裂及红外光谱等方面的研究表明 :该矿床成因具多元性 ,为浅成热液矿床 ;成矿物质来源具多源性 ,既有岩浆来源又有地层来源。富金矿物形成于高硫逸度和较氧化的条件下 ,矿体剥蚀深度不大 ,且具有东低西高的趋势。     

铧厂沟金矿床北部控矿剪切带地质特征及金的富集规律

野外调研和室内分析结果表明。区域韧性剪切带在铧厂沟金矿床非常发育，并经历了右行—左行—右行多期（次）活动。北部控矿韧脆性剪切带是区域韧性剪切带演化的产物，以左行剪切为主。位于铁夹树—庙湾北部厚层灰岩的下部。北部金矿带受北部控矿剪切带控制，长度大于1km．厚度约70cm，从地表延伸至1120m标高。未见尖灭趋势。黄铁矿是该类矿石中最重要的金属矿物。自然金是主要金矿物。有明金和显微金两种。矿石结构构造较为复杂。集中反映了热液矿床的构造特征。矿带的形成可划分为热液期和表生期。原生矿石中绝大部分明金、显微金中的包体金和裂隙金都与黄铁矿密切相关。黄铁矿（Ⅰ）经历了韧脆性变形。因而是金的最佳载体矿物。北部韧脆性剪切带的多期（次）活动，使金富集成为工业矿体。结合地质特征，预测该矿带可延伸至1120m以下一定深度。     

内蒙古阿右旗低品位镍矿石可选性试验研究

该试验对低品位镍矿进行了选矿试验研究。结果表明：采用一段磨矿、细度0.074mm 85％、先反浮选脱泥、脱泥后的尾矿进行粗选,两次粗扫选、三次精选流程;浮选药剂采用碳酸钠、2#油、CMC、硫酸铜、丁基黄药、J622;试验指标为：原矿镍品位0.18％、浮选精矿镍品位3.15％、浮选尾矿品位0.11%、反浮选产品镍品位0.19%、精矿镍回收率39.17％。该研究结果为该矿石的可选性评价提供了技术依据。     

Geological significance of componential characteristics of pyrite from Shibaqinghao gold deposit in central Inner Mongolia, China

There are two types of gold ore in Shibaqinghao gold deposit, mylonite ore and quartz vein ore. Pyrite accompanying with native gold in mylonite ore has Fe from 43.66 to 45.32 wt% and S from 52.64 to 53.55 wt%. It is clear that this kind of pyrite is poor in both sulphur and iron. That means that the mylonite ore may be related to metamorphic water. Pyrite in the quartz vein ore has Fe from 44.38 to 45.30 wt% and S from 53.08 to 54.00 wt%. It means that this kind of pyrite is poor in iron but rich in sulphur, while the quartz vein ore may be related to magma water.     

铁炉坪银铅矿床银赋存状态及其选矿工艺探讨

采用人工重砂、光薄片、Ｘ粉晶衍射、扫描电镜及电子探针等综合方法，查明铁炉坪银铅矿床中的独立银矿物有银黝铜矿、自然银、辉银矿、硫铜银矿、硫锑银矿、硫锑铜银矿和溴氯角银矿等７种。在原生矿石中，银黝铜矿为主要银矿物，并以包裹体形式分布在方铅矿之中；在氧化矿石中，辉银矿、自然银、溴氯角银矿等均占一定比例。矿石中的银主要赋存在独立银矿物之中。银矿物粒度细小，形态复杂，选矿时宜采用浮选法或浮选—重选联合流程。对氧化矿石也可采用先硫化、然后浮选的流程     

扬子板块西缘攀西地区白草矿区黄铁矿标型元素特征及其指示意义

黄铁矿是重要的金属硫化物矿物,在多种矿床中均有产出,其标型特征对矿床成因、矿体空间分布等具有重要的指示意义.以扬子板块西缘攀西地区白草矿区黄铁矿为研究对象,利用矿相学、电子探针等分析方法来对比研究浸染状、致密块状、斑杂状、网脉状矿石中黄铁矿的标型元素特征.结果表明:白草矿区黄铁矿Fe、S平均含量(质量分数,下同)分别为...     

Geological significance of componential characteristics of pyrite from Shibaqinghao gold deposit in central Inner Mongolia, China

1Geologic settingThe Shibaqinghao gold deposit is situatedinthemiddle part of Serteng Mountains,Inner Mongolia.Geotectonic placeislocatedinthe western part of thenorthern margin of the North China Craton.Dongwufenzi Group that is the country rocks ofShibaqinghao gold deposit is composed of green-schist-facies metamorphic rocks.According to thestudy(Liuet al,1987),the proto rocks of Dong-wufenzi Group are assumed to be ultramafic volcanicrocks(komatiite),tholeiitic and alkali basalts,sili…     

镇旬盆地金矿地质特征及找矿方向

镇-旬盆地金鸡岭向斜南北两翼是秦岭板块内重要的成金区域。区内金矿类型有三种：金龙山细碎屑岩-碳酸盐岩型、二台子钠长石角砾岩型、牛家沟石英脉-蚀变岩型。主要载金矿物为黄铁矿、含砷黄铁矿、黄铜矿、毒砂、石英、方解石等。金以自然金为主，次有含银自然金。本区含矿地层主要为中泥盆统古道岭组（D2g）、上泥盆统南羊山组（D3n）、星红铺组（D3x）和下石碳统袁家沟组（C1y）。近东西向的剪切破碎带直接控制矿体的分布。蚀变以黄铁矿化、黄铜矿化、毒砂矿化、汞锑矿化、硅化、方解石化等为主。Au，As，Sb，Hg元素组合直接指示金矿床的存在。分析镇-旬盆地金鸡岭复式向斜南北两翼成矿条件．得出在北带金龙山-丘岭金矿带东延的西坡岭-丁家山背斜带；中带的泗峡口-二天门带；南带的仁河口-公馆-回龙复背斜汞锑矿带；是成金的有利区域。     

山东乳山金青顶金矿床金的赋存状态研究

山东乳山金青顶金矿床是一种硫化物石英脉型金矿床,富含黄铁矿,研究黄铁矿中金矿物特征,可以为金矿的勘探、矿石的选冶以及矿床成因提供理论支撑。本文通过电子探针能谱仪和波谱仪对金青顶金矿黄铁矿中金矿物的矿物学特征、化学成分和赋存状态进行了精细研究,探讨了黄铁矿与金矿的成因关系。结果表明金主要以自然金和碲金银矿的形式存在,另含少量的碲金矿,包裹在黄铁矿之中或者充填在黄铁矿的裂隙中。金矿物的形成可能是成矿流体体系达到金的过饱和从而直接沉淀所形成。     

山东省平邑县归来庄金矿物质组分及矿床成因分析

归来庄金矿，Ａｕ是唯一达到工业品位的组分。属贫硫氧化型金矿。矿石矿物近５０种之多，其中金属矿物以褐铁矿为主。金矿物有自然金、银金矿、碲铜金矿、碲金银矿，并含银矿物和极少的碲化物。金矿物粒径多＜０．０１ｍｍ，属细粒—微粒型金矿，其嵌连关系以粒间金为主。蚀变作用为气—热蚀变和褐铁矿化。矿床系多期多阶段矿化作用形成。为中温热液矿床。隐爆角砾岩为导矿构造，而热液侵入角砾岩是容矿构造。     

桃园金矿矿床物质成分的初步研究

桃园金矿成因比较复杂．岩广测试和电镜扫描研究表明，金矿矿物组合可划分为金－石英－细粒黄铁矿－毒矿四，金－石英－银－多金属硫化物型；金－石英－自形黄铁广３种类型．通过对矿石的矿物组分和化学成分，以及金、银的赋存状态研究，认为桃园全矿的矿石属于金矿矿物极细，而矿物组成比较复杂的矿石类型．     

利用三山岛金矿尾矿制备塑料母料

经磨矿作业后,金矿选别过程通常会产生大量细粒尾矿,三山岛金矿尾矿堆存量较大,尾矿资源丰富。尾矿中有价元素含量不高,尾矿中丰富的非金属矿资源尚未得到有效回收利用。本文以三山岛金矿尾矿为主要原料,进行了有价元素回收探索研究、分级提纯研究、表面改性研究以及制备PP,PE母料添料的试验研究。将分级提纯后的尾矿作为碳酸钙替代料制备的PP,PE母料添料具有良好的性能指标,实现节能减排,减轻环境负担的同时,减少橡胶原料的消耗。