placer

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

原生矿产于的尧山组玄武质碧玄岩，矿则分布于方山周围的水。

2.Regional volcanic strata are the source of placer gold and laterization process is the main stage of formation of placer gold.

域火山岩地层是金的矿源，地表赤红壤化可能是金形成的主要阶段。

3.Quartz, zircon, magnetite, gold are major constituents of littoral placers in Shandong province, while shell, ballstone, ilmenite, rutile being secondary.

山东省滨海矿以石英、锆英石、磁铁矿、金等为主,其次为贝壳、球石、钛铁矿、金红石等。

4.The types of deposits basically are differential metasomatism in the later magma, pneumatolytic hydrothermal process, pegmatite process, residual deposits and placer deposits.

矿床类型以岩浆晚期分异交代型、气成热液型、伟晶岩型、风化壳型和矿型为主。

5.Four alluvial deposits distributing along Yuanjiang river and the diamondiferous rocks that supply diamonds to these placer deposits have striking properties of varied sources and multi-phases.

沅水流域分布4个金刚石矿床，供给金刚石矿的含金刚石岩体具多期多源特点。