placer

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

原生产于第三纪的尧山组玄武质碧玄岩中，则分布于方山周围的水系中。

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

区域火山岩地层是的源，地表赤红壤化可能是形成的主要阶段。

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

山东省滨海以石英、锆英石、磁铁、等为主,其次为贝壳、球石、钛铁、红石等。

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

床类型以岩浆晚期分异交代型、气成热液型、伟晶岩型、风化壳型和型为主。

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个刚石床，供给刚石的含刚石岩体具多期多源特点。