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Re: ShortonCash post# 131697

Friday, 02/11/2011 3:50:25 PM

Friday, February 11, 2011 3:50:25 PM

Post# of 233161
Same metals, similar host rocks, similar age, similar geological setting and similar alteration. And with any luck, similar potential for the discovery of similar large and economic mineral deposits.

Once convinced of the nature of the up-to-now unknown IOCG belt in Baja, Jim Dawson and his partner did a lot of preliminary leg work and began tying up major land positions in the belt. After trying to attract the interest of a number of junior mining companies in the project and being rejected


http://www.321gold.com/editorials/moriarty/moriarty030304.html

A new model, called IOCG for Iron Oxide, Copper and Gold, was formed based on the original Olympic Dam discovery. Basically it involved searching for iron deposits having both a high gravity and high magnetic indications associated with copper and gold values in outcrops. If you want to mine copper and gold in big numbers, look for massive deposits of magnetite or hematite and hope that it has copper and gold associated with it.



Finding a single brass ring can be quite rewarding for a junior. The last time I remember a junior making a giant find was when Diamond Fields came up trumps with Voisey Bay. That massive nickel deposit in Labrador, discovered in 1993, rocketed the stock from $.20 a share to $165, a 84,000% climb.
http://geea.geoscienceworld.org/cgi/content/short/8/3-4/343

Zirconium, the most conserved (least mobile) element in the volcanic and plutonic rocks of the area, was used as a common denominator for molar element ratios. The molar ratios Na/Zr, K/Zr and Al/Zr indicate that the host rocks proximal to the major deposits were affected by sodium depletion and potassium enrichment. The molar ratio (14Ca+19Na–14CO2)/(6Si+Al+2Fe+2Mg), recalculated to a percentage scale, constitutes a modified alteration index which can be used to quantify the degree of hydrothermal alteration in the host rocks. However, although this index differentiates barren from potentially prospective sectors (i.e. strongly altered host rocks), it does not identify the hydrolytically altered rocks that are closely associated with economic copper mineralization



An intrusion-related origin for Cu–Au mineralization in iron oxide–copper–gold (IOCG) provinces

At deep levels, the magma–fluid system cannot generate sufficient mechanical energy to fracture the host rocks as in porphyry systems and the IOCG deposits therefore form in a variety of fault-related structural traps where the magmatic fluids may mix with other fluids to promote ore formation. At shallow levels, the IOCG deposits form breccia and fracture-hosted mineralization styles similar to the hydrothermal intrusive breccias and sulphide vein systems that characterize many porphyry Cu–Au deposits



http://gsc.nrcan.gc.ca/mindep/synth_dep/iocg/index_e.php#exp

The main ore minerals are iron oxides, Cu-Fe sulphides, uranium oxides and/or REE-enriched minerals combined in diverse metal associations (e.g. Fe-P; Fe-REE-Nb, Fe-Cu-Au, and Fe-Cu-Au-U-Ag-REE). Anomalously high values for Fe, Cu, Au, U, Ag, ±REE's, especially the LREE (Ce, La, Nd, Pr, Sm, Gd), ±Nb ±P ±Co ±F ±B ±Mo ±Y ±As ±Bi ±Te ±Mn ±Se ±Ba ±Pb ±Ni ±Zn provide diagnostic element suites for geochemical exploration. Ore assemblages may appear highly varied but in fact comprise a series of elements that share certain chemical affinities that facilitate their transportation and/or precipitation together. Iron oxide is either co-transported or pre-existing and acts as catalyst in precipitation of other metals [/quote]

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