Abstract: With the continuous deepening of the mining of mineral company in the Jiuquan Iron and Steel Mineral Company Huashugou，the ore properties have changed greatly，Huashugu iron process mineralogy study was researched to provide guidance for the mine production and process transformation.The results show that grade of ore is 29.74%，hematite (limonite) accounted for 67.62% of the total iron，iron carbonate accounted for 26.66% of the total iron.The main mineral is hematite，siderite，small amount of limonite，the contents were 26.62%，16.52% and 4.35%.The main gangue mineral is quartz，carbonate minerals and sericite，etc，and the quartz content is 25.33%.Ore structure is mainly euhedral-subhedral crystal structure，anhedral crystal structure，metasomatic structure and interstitial structure，and the texture is mainly massive texture，the banded texture，disseminated texture，mesh texture and honeycomb texture.Hematite is mainly produced in flaky，fibrous，thin，needle like，radiate and scaly aggregates，and the aggregates often form dense blocks.Siderite is mainly produced in granular and granular aggregations，mainly with coarse grained cloth，closely related to calcite，dolomite，muscovite and quartz.Limonite is mainly disseminated in colloidal and earth like disseminated in non-metallic minerals，and is filled with fine veins and netting among other mineral grains，some of them are porous，honeycomb and embedded in ore，and the particle size is very uneven.Quartz was more self-shaped，semi-self-shaped granular aggregate output，the particle size was uniform，often granulated by carbonate minerals，mica and sericite filled.Calcite and dolomite was anhedron，irregular，veins，reticulate output，often coexist with siderite to form collection.

Key words: Process mineralogy, Hematite, Siderite, Dissemination size