Located in the Duobaoshan ore concentration area of Nenjiang County, Heilongjiang Province, the Sankuanggou deposit is a small skarn type iron-copper deposit. On the basis of field geological investigation, ICP-MS test, indoor rock ore appraisal, scanning electron microscopy (SEM) and energy spectrum analysis, the authors studied ore characteristics of the Sankuanggou deposit. Numerous minerals such as empties, ferberite, scheelite, cassiterite, native Bi, tellurobismuthite, wittichite, cobalt-pyrite, hessite, ellurobismuthite, electrum, zinc-bearing enargite, native gold, and kustelite were newly discovered. Useful metals such as copper, iron, zinc, tungsten, cobalt, indium and bismuth should be evaluated so as to understand the characteristics of these elements. In this way, the comprehensive utilization of these elements and the improvement of the economic values can be realized. The formation process of the Sankuanggou deposit can be divided into five stages, in which the endogenous ore-forming period can be divided into four phases, i.e., ① the dry skarn phase, ② the wet skarn phase, ③ the oxide phase, ④ the hydrothermal-sulfide phase, whereas the supergene period only has the supergene phase (phase 5). The iron mineralization occurred at the high temperature stage, whereas the copper mineralization was produced by hydrothermal metasomatism under the medium temperature condition.