地球物理探矿方法在金矿勘查中的应用研究

根据各类型金矿成矿环境、控条件的研究成果，认为控制金矿矿的两个最基本条件是：构造岩浆作用和在构造岩浆作用背景上的金属硫化富集作用。     

中国夕卡岩型金矿床的勘查进展和方向

夕卡岩型金矿床长期没有得到足够的重视。这种类型金矿占我国金矿探明储量的１４．８３％，因此应是十分重要的金矿类型，很有必要加强研究和勘查。已经总结的中国夕卡夺型金矿床的地质地球化学特征，可以作为找矿勘查的标志。     

三山岛金矿海边地下开采矿山稳定性的数值模拟分析

本文用数值模拟的分析方法, 评价了三山岛金矿地下开采引起的开采效应及地表下沉盆地的变形特征。结果表明, 矿山地表是稳定的, 上部一期工程开采引起的地表最大下沉量不超过700mm, 深部开挖时不超过995mm左右；在采场充填的情况下, 地表下沉值将降低55%左右；由于矿山地表变形较小, 加之覆盖层第四纪中存在着两层总厚度8～12m的隔水粘水层, 因此不致沟通地表水与井下的直接联系而危及矿山的安全。     

吉林省珲春市黄松甸子砾岩型金矿床开采技术条件

本文重点论述吉林省珲春市黄松甸子砾岩型金矿床工程地质特征及基类型的划分，对矿床的工程地质条件给予定性和半定量评价，论述了矿床的开采技术条件。     

伽玛能谱快速找金方法及其应用

选用携带式微机伽玛能谱仪测定岩石，土壤中钠，钍，钾及其放射性总量，能定量或半定量地估算某些含金地质体中的含量。对新疆某地进行地面，井下测定，新发现金矿脉一条，金储量６２４ｋｇ；圈定４个金矿化段，２个富集金地段；验证评价２个综合化探晕圈，快速评价２个金矿区和８个金矿点；特别对井下预测金品位准确可靠，能及时指导矿区井下采掘。     

IMPACTS OF SEA LEVEL RISE ON MAJOR PROJECTS AND URBANDEVELOPMENT IN CHINA''S COASTAL PLAINS

LIntroductionSeaIevelnse(SLR)isacertainresu1tcausedbyclimaticwampandunreasonableanthropogedcaCtivities,itwillbringaboutaseriesofnegaivethesonenvironmentalevoltalonandsocio-econonucdevelopmentincoastalarea.Cboaisavastcowtrywithl8,OOOkmand14,OOOkmofcontinentalandislandcoastlinesrespeCtively.Over3Ohaddleandbigcitiesandneariy2Oimportantharbours,includingTianJin,ShanghaiandGuanghouarelocatedinthecoastalareawhere4lpercentofthenation'spopulahonandoveY5operedofGNP(GrossNationalProduCt)iscon…     

Geology of epithermal silver-gold bulk-mining targets,bodie district,Mono County,California

The Bodie mining district in Mono County, California, is zoned with a core polymetallic-quartz vein system and silver- and gold-bearing quartz-adularia veins north and south of the core. The veins formed as a result of repeated normal faulting during doming shortly after extrusion of felsic flows and tuffs, and the magmatic-hydrothermal event seems to span at least 2 Ma.Epithermal mineralization accompanied repeated movement of the normal faults, resulting in vein development in the planes of the faults. The veins occur in a very large area of argillic alteration. Individual mineralized structures commonly formed new fracture planes during separate fault movements, with resulting broad zones of veinlets growing in the walls of the major vein-faults. The veinlet swarms have been found to constitute a target estimated at 75,000,000 tons, averaging 0.037 ounce gold per ton. The target is amenable to bulkmining exploitation.The epithermal mineralogy is simple, with electrum being the most important precious metal mineral. The host veins are typical low-sulfide banded epithermal quartz and adularia structures that filled voids created by the faulting. Historical data show that beneficiation of the simple vein mineralogy is very efficient. On the cover: Southeast view of Bodie mining district in Mono County, California, one of the more famous pioneer epithermal gold producers in the western U.S. Recent exploration drilling suggests an additional resource of 2 million ounces of gold. The townsite is at the intersection of roads near the center of the photo. The foreground is mainly tuff breccia of the Bodie Hills volcanic field. Arcuate lines in the valley beyond the hills are old Mono Lake shorelines. The White Mountains form the ridge on the skyline. Photo by Frank Kleinhampl, about 1970.     

CO_2快速检测管用于普查金、铀矿的初步试验

本文叙述了CO_2快速检测管(简称CO_2速测管)的原理、野外观测方法、地质效果以及在测量中应注意的问题。野外试验结果表明:在已知金、铀矿床上测到了明显的CO_2异常。     

试论汉中地区金矿找矿远景

本文在讨论汉中地区地质背景的基础上,对金矿预富集的特征提出了认识。关于本区今后金矿找矿的前景和地质工作部署,笔者提出:从实际出发,继续扩大最有潜在远景的勉略区,同时探索秦岭区和扬子区金矿新类型。对于金矿和伴生元素(Ag、U、V、Mo、Cu、Pb、Zn、Ni、S等)要综合分析、综合找矿。     

Structural study of a semiductile strike-slip system in the Central Iberian Zone (Variscan Fold Belt,Spain): structural controls on gold deposits

The Villalcampo shear system is a regional dextral strike-slip fault zone that affects Late Variscan granites and their metamorphic country rocks over an area of about 150 km². The detailed geometry of this subvertical north-west—south-east shear zone is outlined. The system forms an extensional fan to the northwest and extends to the south-east as a broad extensional duplex. Particular attention is focused on the distribution of fault rocks and associated veins in its north-west splay. A structural study of the shear bands (encompassing both geometric and kinematic criteria) and a microscopic study of the fault rocks has led to the interpretation of the system as a brittle—ductile shear zone. Calculations give a shear strain value of = 1.5 and a minimum displacement of s = 3700 m. The localization of gold mineralization in mylonite-filled subvertical extensional veins is a product of the formation of the Villalcampo shear system. The subvertical faults and veins underwent a process of cyclical sealing and reopening. As such they acted as valves controlled by fluid pressure regulating fluid—rock interactions and gold deposition. Conditions favouring these processes occur near the base of the seismogenic zone in the vicinity of the frictional—quasi-plastic transition at mid-greenschist metamorphic conditions (T = 350°C and 10–15 km depth).