There are known brown coal deposits in Primorsky Krai (Russian Federation), where coals contain rare elements (Ge, U, REE, etc.) up to industrial concentrations. One of the known metalliferous coals is the Rakovka coal-bearing depression, located on the southern edge of the Khanka (Prikhankaiskaya) Lowland, with an area of about 70 km². Rare-metal granites with a developed weathering crust are spread in its basement and flanks. The structural conditions forming the depression were studied using measurements of orientations of structural elements (layering, contacts, veins, and dikes) with regard to kinematic conditions of faulting. The coal and host rocks were sampled in sections in the cross strike of the coal seam. Granites and dikes cutting them were sampled by separate rock chip samples. The chemical composition and element content were determined for all samples. It was found that the adjacent rocks played a major role in the formation of the Rakovka rare-metal-coal deposit. The rare-elements enrichment is not associated with active tectonics, faults, and hydrothermal sources, as was previously assumed. Rather, it was caused by the hydrogenic and clastogenic removal of these metals from the weathering crust of granites of the depression's flanks and argillated basite dikes cutting the granites. The hydrogenic nature of the anomalous accumulation of U in sorbed form on organic matter of coals is confirmed by the predominant enrichment of low-ash beds. Rare earth elements entered coal seams both in mineral and dissolved forms. A model of REE and uranium input into the coal-bearing sediments of the Rakovka depression was proposed.

滨海边疆区（俄罗斯联邦）有已知的褐煤矿床，其中煤中含有高达工业浓度的稀有元素（Ge、U、REE 等）。已知的含金属煤之一是 Rakovka 含煤洼地，位于 Khanka (Prikhankaiskaya) 低地的南部边缘，面积约 70 km ². 具有发达风化壳的稀有金属花岗岩分布在其基底和侧面。使用与断层运动学条件有关的结构元素（分层、接触、脉和堤坝）的方向测量来研究形成凹陷的结构条件。煤层和主岩在煤层的交叉走向中分段取样。切割它们的花岗岩和堤坝通过单独的岩屑样品进行取样。测定所有样品的化学成分和元素含量。发现邻近的岩石在 Rakovka 稀有金属煤矿床的形成中起主要作用。如先前假设的，稀有元素富集与活动构造、断层和热液源无关。相当，这是由于这些金属从凹陷两侧的花岗岩风化壳和切割花岗岩的泥质碱基岩脉中被氢和碎屑去除引起的。低灰分床的主要富集证实了吸附形式的 U 在煤的有机质上的异常积累的氢性质。稀土元素以矿物和溶解形式进入煤层。提出了稀土元素和铀输入到拉科夫卡凹陷含煤沉积物中的模型。稀土元素以矿物和溶解形式进入煤层。提出了稀土元素和铀输入到拉科夫卡凹陷含煤沉积物中的模型。稀土元素以矿物和溶解形式进入煤层。提出了稀土元素和铀输入到拉科夫卡凹陷含煤沉积物中的模型。