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大坪金矿床是哀牢山成矿带上的大型金矿床,已有千年开采历史,早期开采主要在老金山矿段。老金山矿段位于大坪金矿床南部,产在志留纪地层中,缓倾正断层控矿。该矿段所在的山峰被称为老金山。老金山位于一向斜中,东翼岩层向南西倾,西翼岩层向南东倾。但是,老金山南坡、中部地层产状南倾,其北部地层北东倾。老金山南部,志留纪中上统青山组和志留纪中上统康廊组呈弧形不整合接触;老金山北部,发育多条放射状、环状断裂。该矿段岩浆活动发育,说明老金山是岩浆上升形成的穹窿构造,老金山矿段控矿断层为该穹隆构造的次级构造。该矿段发育2期隐爆角砾岩和层状高硫化物矿体,是寻找斑岩型矿床的重要找矿标志,老金山矿段隐伏斑岩体向深部矿化蚀变逐渐增强,在大坪金矿床周围有哈播铜钼金矿床、长安冲铜钼矿床和铜厂铜钼矿床等斑岩型矿床。由以上证据,推测老金山矿段深部可能存在斑岩型矿床。
The Daping gold deposit is a large-scale gold deposit on the Ailaoshan Metallogenic Belt. It has a history of thousands of years of mining and is mainly produced in the old Jinshan ore section. Located in the southern part of Daping gold deposit, the old Jinshan ore section is produced in the Silurian strata and the gentle dip fault is controlled. The mountain where the mine is located is called Laojin Shan. Old Jinshan is always inclined, the east wing rock incline to the southwest, the west wing rock to the south eastward. However, on the southern slope of Laojin Shan, the middle strata are south-dipping and their north strata is northeast dip. In the southern part of the old Jinshan Mountain, the middle Silurian of Silurian and the middle and upper Kanglu Formation of Silurian formed arc-shaped unconformity contact. In the northern part of Laoshanshan, a number of radial and annular faults were developed. The magmatic activity of the orebody developed, indicating that Laojin Shan is a vault structure formed by the magma rising. The ore-controlling fault of the Lao Jinshan orebody is the secondary structure of the dome structure. The second stage cryptoexplosive breccia and stratiform high sulphide orebody are developed in this section, which is an important ore prospecting sign in search of porphyry deposits. The concealed porphyry in the old Jinshan section gradually increases to deep mineralization, Daping gold deposit around the Hedu copper-molybdenum gold deposits, Chang’an red copper and molybdenum deposits and copper copper molybdenum porphyry deposits and other porphyry deposits. Based on the above evidence, it is speculated that there may be porphyry deposits in the deep part of Laojin Mountain.