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Wednesday, September 11, 2019 9:49:28 PM
Cinco Minas is a classic Tertiary age, volcanic-hosted, low sulphidation, epithermal, precious metal deposit. The vein, which is up to about 30 metres wide, has had at least 3 quartz veining/metal precipitating events noted. The size and dimensions of the Cinco Minas vein varies somewhat from report to report. An unknown author (signature not discernible) in a 1954 report describes the vein as being about 3 km long and about 20 feet wide at the Cinco Minas mine (El Abra workings?), yet at the Dos Juanes crosscut he describes the Cinco Minas vein as being 100 feet wide and the Dos Juanes vein as being somewhat narrower and separated from Cinco Minas by about 100 feet of country rock.
Northwest of Dos Juanes the San Juan vein continues as the El Aguila vein. He further suggests that the Cinco Minas and San Juan veins are one. Wisser (1930) states that the Cinco Minas vein lies in the footwall of the regional fault zone, paralleling it in strike in dip (this would be the high grade shoot portion of the vein, as seen at El Abra). It is a shatter zone with some displacement, and the vein is merely a mineralized member of the group of fractures making up the fault zone.
The vein is not a simple fissure; it seldom shows clean-cut walls except where a fault of the regional fault zone forms its hanging wall. Fracturing varies from mere sheeting to intense shattering and crushing. Vein matter may consist of thin irregular stringers or be present in large amounts, cementing jumbled andesite fragments; in places a solid vein several metres wide occurs. The footwall shows the least shattering, consisting of closely-spaced stringers or massive quartz with or without calcite. Shattering increases towards the hanging wall, and the vein consists of andesite and quartz fragments cemented by quartz and calcite; calcite is usually more abundant next to the hanging wall.
Silicification of both the wallrock and included fragments is often intense. Vein textures range from coarsely crystalline to chalcedonic; the finer grained form is more common.
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