Cipher Resources Inc DREXF

Dorex & Deposits

[bullorbear1]

Here's a quote from a past News Release, below are some definitions on deposit types.

"This exploratory drill program was designed to test for widespread porphyry or IOCG (Iron Oxide Copper Gold) style mineralization as well as a smaller, higher grade structurally controlled shear zone hosted copper oxide mineralization."

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Iron oxide-copper-gold (IOCG) deposits are a recently-recognized class of hydrothermal ore deposit that can be economically very significant. They have become an important target type in the portfolio of many exploration and mining companies. In fact the number of deposits classified into the IOCG category has increased dramatically in the past 15 years, as has the understanding of the genesis of this enigmatic deposit type.

IOCGs occur in a variety of geological settings around the world. Their mode of origin remains controversial, but they appear to be replacive. Some of the largest mineral deposits in the world are IOCGs. Examples include the huge Olympic Dam deposit in Australia which contains over 2.6 billion tonnes of ore grading 1.2% copper, 0.5g/t gold, 2.7g/t silver, and 0.4kg/t uranium oxide. Another important, world-scale example is the Kiruna iron deposit in Sweden which originally contained over 2Bt of magnetite.

Typical features of IOCG include:

• Copper-gold sulphide mineralization typically occurring with large concentrations of iron oxide minerals; mainly magnetite and hematite, as opposed to iron sulphides.

• They tend to be localized along subsidiary structures related to major, crustal-scale fault systems and are associated with widespread hydrothermal alteration.

• They appear to replace the host rock in which they are found.

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Porphyry copper deposits are copperorebodies which are associated with porphyriticintrusive rocks. The ore occurs as disseminations along hairline fractures as well as within larger veins, which often form a stockwork. The orebodies typically contain between 0.4 and 1 % copper with smaller amounts of other metals such as molybdenum, silver and gold. They are formed when large quantities of hydrothermal solutions carrying small quantities of metals pass through fractured rock within and around the intrusive and deposit the metals.

Porphyry copper deposits are the largest source of copper, and are found in North and South America, Europe, Asia, and Pacific islands. None are documented in Africa. The largest examples are found in the Andes in South America.

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