Throughout the Phanerozoic an estimated 125, 895 porphyry copper deposits were formed; however, 62 % of them ( 78, 106 ) have been removed by uplift and erosion.
32.
In 2002, drilling led to the first intersections with the subsequently named Hugo Dummett Deposit, which is one of the highest grade, undeveloped porphyry copper-gold deposits in the world.
33.
Anaconda Mining Company acquired the claims to the property in 1963 and undertook a major exploration campaign that identified the Rosemont deposit as a major porphyry copper ore body.
34.
Geologist J . D . Lowell who directed the program and John M . Guilbert went on to develop this work into a general pattern for porphyry copper deposit exploration.
35.
For porphyry copper, rank is still the same although Agusan del Norte have a slight edge than Agusan del Sur as low-level diorite is already exposed in the Asiga area.
36.
The company yesterday said it received approval from the government of Panama to develop a 43 billion pound porphyry copper deposit located in the province of Chiriqui in Western Panama.
37.
Subsequent granitic intrusions and felsic volcanic eruptions dominated the late Mesozoic and early Cenozoic, corresponding to the Laramide Orogeny when most of the porphyry copper deposits of the region formed.
38.
Some porphyry copper deposits in oceanic crust environments, such as those in the Philippines, Indonesia, and Papua New Guinea, are sufficiently rich in gold that they are called copper-gold porphyry deposits.
39.
Hezarkhani, A ., Williams-Jones, A . E ., and Gammons, C . H . ( 1999 ) : Factors controlling copper solubility and chalcopyrite deposition in the Sungun porphyry copper deposit, Iran.
40.
Hezarkhani, A ., and Williams-Jones, A . E . ( 1998 ) : Controls of alteration and mineralization in the Sungun porphyry copper deposit, Iran; evidence from fluid inclusions and stable isotopes.
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