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大道尔吉超镁铁质岩体位于祁连中间地块西端南缘沙果河深断裂的北侧。属于被肢解的蛇绿岩残片，由地幔橄榄岩和堆晶杂岩带组成。其中赋存的铬铁矿床普遍含有铂族元素，铂族元素的总量在富矿中平均为０．３０６×１０－６，贫矿中平均为０．１４９×１０－６。铂族元素的含量与矿石中Ｃｒ２Ｏ３的含量呈正消长关系，铬铁矿体即是铂族元素的矿化体。铂族元素的配比关系各类矿石平均为Ｒｕ：Ｏｓ。Ｉｒ＝１７．１：１０：２．２。为钌型铬铁矿床。铬尖晶石的成分特征是铂族元素矿化类型的重要识别标志。
Dadilji ultramafic rocks are located on the north side of the Shaguohe deep fault on the southern edge of the western end of the middle Qilian block. Belong to the dismembered ophiolite fragments, the mantle peridotite and hematite complex belt. Among them, the chromite deposit commonly contains platinum group elements. The total amount of platinum group elements in the rich ore is 0.306 × 10-6 on average and 0.149 × 10-6 in the lean ore. The content of PGs and the content of Cr2O3 in the ore show a positive correlation with each other. The chromite is the mineral of the PGs. The relationship between the proportion of platinum group elements All types of ore on average Ru: Os. Ir = 17.1: 10: 2.2. Ru-type chromite deposit. The compositional characteristics of chrome spinel are important identification symbols of the type of platinum group element mineralization.