oxidized zone


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Related to oxidized zone: hypogene

oxidized zone

[′äk·sə‚dīzd ‚zōn]
(geology)
A region of mineral deposits which has been altered by oxidizing surface waters.
References in periodicals archive ?
0 mm) concretionary nodules on the fracture surface where oxidation is most intense, and as coatings on minerals in the oxidized zone.
The oxidized zone extends to a depth of 120m (roughly 105m vertically below surface), below which disseminated sulphides (pyrite and chalcopyrite) occur.
Systematic chip sampling across this oxidized zone on each adit level yielded the highly encouraging grades summarized in Table 1 below:
Core hole SA-37 has higher gold and silver values in the oxidized zone than its corresponding RC hole, SA-13.
The samples were taken across a 700 meter wide oxidized zone that trends to the west an unknown distance under the post-mineral ignimbrites and gravels.
From surface to depth, each of the holes intersected the following typical alteration sequence : -- a thin oxidized zone (1-15 m), -- approximately 70 metres of avanced argillic alteration containing disseminated pyrite, chalcopyrite and molybdenite, -- 50 to 90 metres of leached and silicified hornfels with hydrothermal magnetite patches and with up to 10 percent pyrite and 2 percent chalcopyrite and trace amounts of molybdenite, and -- propylitic alteration: strong near hornfels and decreasing toward the end of the hole; characterized essentially by epidote patches and calcite veinlets.
Exploration Director Jeff Rayner, The potential at Hawiah is huge as it is considered to be comparable to some large copper and copper-zinc deposits in the Arabian-Nubian Shield, with ancient gold workings in the oxidized zones at surface.
The exploration drilling program for the next 3-6 months is designed to target favourable known horizons within the north and south extensions along strike from the Sihayo resource, primarily targeting shallow oxidized zones.
Past drilling by Cambior intersected thick, deeply oxidized zones of anomalous gold mineralization over large areas and deeper level zones of strongly pyritic advanced argillic alteration with anomalous gold, copper, lead and zinc mineralization.
Mineralization in both deposits typically occurs as sub-micron sized disseminated gold in oxidized zones near surface, and in association with primary sulphide mineralization at depth.
George Beattie, President and CEO of Fischer-Watt noted that, "It has always been our stated intention to develop a relatively small copper mine in the upper oxidized zones of the ore body.
Initial assay results returned strongly anomalous Ag, Au, Zn and Pb values in several oxidized zones up to 15 metres wide each from three holes with assays still pending for the other three holes.