Placer dredging

It can be concluded that: First,primary deposit and placer deposit are two main deposits in this origin;Second,the primary deposit formed at hydrothermal stage and mesothermal stage between Presinian and Cretaceous;Third,the feature of ore body is wide and scattered on distributing,small on scale;Four,the storage capacity of the crystal is very abundant,its quality is fine,depth of burial is s.

通过对江苏东海区域成矿地质条件以及含晶石英脉成群成带分布规律的研究,得出以下结论:①该区水晶矿床为原生矿、砂矿两种类型;②水晶原生矿形成于前震旦纪以后到白垩纪以前的高、中温热液期;③矿体具分布广、规模小、分布散等特点;④东海水晶储量丰富、品位极高、埋藏浅,具有很好的开发利用前景。

Based on recent results and new data,we summarize and study distributions and pisions of placer deposits and ferromanganese nodules/crusts in the sea areas of China.

综述和研究了我国海域砂矿资源和(微)结核—结壳的分布及其区划。

Distribution of surface sedimentary geochemical elements and their demonstration mineralized by placer in western Taiwan Strait;

台湾海峡西部表层沉积地球化学元素分布及砂矿成矿显示

The native minerals originating from Tertiary basanite of Yaoshan formation,the placer is in water systems around Fangshan.

原生矿产于第三纪的尧山组玄武质碧玄岩中，砂矿则分布于方山周围的水系中。

The mineral shuanfengite was found as a constituent of placer concentrates and crushedores of a chr0mite deposit.

在铝矿石及矿体邻近的砂矿中均可找到。

This authors introduce the methods of a statistical and infinite calculus to determine the marginal grade of titanium placer in Panzhihua City,in order to make a complete analysis of reserves of titanium placers there.

简要介绍用统计和曲线积分方法确定攀枝花钛砂矿的边界品位;对传统的地质块段法储量估算进行数学纠正,并对调查区钛砂矿储量进行估算(以丙谷矿体为例),旨在提出一个钛砂矿储量估算分析流程。

The authors introduces general geological conditions of Titanium placer deposit in Ganbatang Mining Area of Luquan and describes geological characteristics,mineralization rules,ore-control factors and ore-prospecting signs of weathered crust Titanium deposit,which has been formed by corsilite of later Hualixi Period and distributed widely within the boundaries of Luquan.

叙述了云南禄劝干坝塘矿区钛砂矿矿床的矿区地质概况,阐述了矿区晚华力西期辉绿辉长岩风化后形成的风化壳型钛砂矿矿床地质特征、成矿规律、控矿因素、找矿标志等。

This paper analyses the features and development status of sand resources,illustrates the problems and presents some proposals in industrially exploiting the sand resources.

山东半岛滨海区域蕴藏着丰富的砂矿资源,种类和储量在我国沿海省份中名列前茅。