In the metallogenetic process of gold placers, oxidation-reduction played an important role.
在砂金成矿过程中，氧化还原反应起着积极作用。
The geological conditions of the Shandong Peninsula arc similar to the geological features of the marine gold placers in the world.
山东半岛地质条件与世界海滨砂金矿床形成地质条件基本上相似。
Quartz, zircon, magnetite, gold are major constituents of littoral placers in Shandong province, while shell, ballstone, ilmenite, rutile being secondary.
山东省滨海砂矿以石英、锆英石、磁铁矿、砂金等为主，其次为贝壳、球石、钛铁矿、金红石等。
In this paper the genesis and formation periods of the placers (littoral, glacial and alluvial) and biogenic-biochemical sedimentary deposits are briefly discussed.
概述了滨海砂矿、冰川砂矿、冲积砂矿和生物、化学沉积矿产的成因及成矿期。
Sichuan Province is one of the placer gold producing areas in our country, Over the whole province there are about 30 gold placers and more than 200 mineral occurrences.
四川已知有砂金矿床约30处，矿点200余处，民采点数百处，是我国主要的砂金产区之一。
The concrete delivery system for the dam is composed of mixer feeding conveyer, system connecting conveyer, 3 high-speed belt conveyer lines, 3 vacuum-chutes and 2 sets of tower crane placers.
龙滩大坝混凝土运输供料线系统由拌和楼出料皮带机和系统连接皮带机、3条高速皮带机供料线、3条负压溜槽和2台塔式布料机组成。
The concrete delivery system for the dam is composed of mixer feeding conveyer, system connecting conveyer, 3 high-speed belt conveyer lines, 3 vacuum-chutes and 2 sets of tower crane placers.
龙滩大坝混凝土运输供料线系统由拌和楼出料皮带机和系统连接皮带机、3条高速皮带机供料线、3条负压溜槽和2台塔式布料机组成。
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