The Raja Au-Co mineralization in the Paleoproterozoic Peräpohja belt in northern Finland is part of the wider Rompas-Rajapalot mineralized area with several known Au-Co occurrences. The area is characterized by distinct tourmaline occurrences, spatially associated with Au-Co mineralization. Four texturally distinct tourmaline types were identified although all analysed tourmalines belong to the alkali-group and are classified as dravite. δ ¹¹B values and fractionation modelling indicates that at least two distinct fluids were responsible for the tourmaline formation with initial end member δ¹¹B values of the fluids at −8‰ and −1‰. Possible sources for boron rich fluids are Svecofennian orogeny related (ca. < 1.9 Ga) metamorphic fluids and magmatic-hydrothermal fluids related to the late-orogenic ca. 1.78 Ga granitoids. Structural data from the quartz-tourmaline veins outlines a strong linear trend towards the Raja high-grade mineralization trend. This is interpreted as evidence for structural control of the Raja mineralization, which possibly is contained in shear-zones or within the hinge regions of local high degree folding.

A distinctive rock unit with bright purple anhydrite layers and white gypsum veins has been intersected by drilling. While the sulfate-rich unit is unmineralized, the mineralogy and regional geological setting suggests an evaporitic origin. Anhydrite has δ³⁴S values in a narrow range from 8.1 to 9.8 ‰. Gypsum has slightly heavier δ³⁴S from 10.6 to 12.2 ‰. Together with isotope fractionation constraints, textural evidence suggests the authigenic formation of gypsum with SO₄^2- sourced from anhydrite. Significant similarities in textures and sulfur isotope values to well-known evaporite successions of the Onega basin, western Russia, further supports the presence of evaporitic strata within the Peräpohja belt.

位于芬兰北部古元古代 Peräpohja 带的 Raja Au-Co 矿化区是更广泛的 Rompas-Rajapalot 矿化区的一部分，拥有多个已知的 Au-Co 矿床。该地区的特点是独特的碧玺产地，在空间上与 Au-Co 矿化有关。尽管所有分析过的碧玺都属于碱性组并被归类为辉长岩，但已鉴定出四种质地不同的碧玺类型。δ ¹¹ B 值和分馏模型表明，至少有两种不同的流体是形成具有初始端元 δ ¹¹的电气石形成的原因-8‰ 和 -1‰ 时流体的 B 值。富硼流体的可能来源是与 Svecofennian 造山运动相关的 (ca. < 1.9 Ga) 变质流体和与晚造山运动相关的岩浆热液流体。1.78 Ga 花岗岩。来自石英-碧玺矿脉的结构数据勾勒出向 Raja 高品位矿化趋势发展的强烈线性趋势。这被解释为 Raja 矿化结构控制的证据，它可能包含在剪切带或局部高度折叠的铰链区域内。

一个具有亮紫色硬石膏层和白色石膏脉的独特岩石单元已通过钻孔相交。虽然富含硫酸盐的单元未矿化，但矿物学和区域地质环境表明它是蒸发成因的。硬石膏的 δ ³⁴ S 值在 8.1 至 9.8 ‰ 的狭窄范围内。石膏具有稍重的 δ ³⁴ S，从 10.6 到 12.2 ‰。连同同位素分馏限制，质地证据表明石膏与来自硬石膏的SO ₄ ^2-的自生形成。质地和硫同位素值与俄罗斯西部奥涅加盆地著名的蒸发岩序列的显着相似性进一步支持了 Peräpohja 带内蒸发岩层的存在。