boxwork


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boxwork

[′bäks‚wərk]
(geology)
Limonite and other minerals which formed at one time as blades or plates along cleavage or fracture planes, after which the intervening material dissolved, leaving the intersecting blades or plates as a network.
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The boxwork could be related to brecciation and in at least one of the caves these features are found in close proximity to each other.
They include Piccadilly Station,Manchester City Art Gallery,Chorlton Park Housing, the Boxwork and a National Trust property in Cumbria.
within the boxwork alteration rinds increases outward from the nodules
Silicification and boxwork openings after the mineral pyrite (iron sulfide) in the southern feature are encouraging for stronger mineralization at depth.
The breccia matrix bears 8-10% fine grained, limonite casts and medium grained boxwork suggesting mixed massive sulfides as protore.
The presence of cobble-size quartz with sulphide boxwork and coarse gold suggest that the placer gold is primary, originating from bedrock sources.
E[acute accent]The prominent feature in this otherwise flat landscape is a hill of hematite boxwork, which at its peak is over 150 metres high, covering an area 500 metres long by 300 m wide.
The presence of cobble-size quartz with sulphide boxwork and coarse gold suggests that the placer gold is primary, originating from bedrock sources.
In general there is strong oxidation represented by boxwork goethite, haematite and jarosite, as well as malachite.
Two samples were submitted, A2A-20K (typical boxwork ore) and A2A-24K (unoxidized sulfide ore).
In the oxidation zones observed, there is intense alteration of the country rock expressed by an abundance of quartz sericite, fluidal quartz with abundant microcavities and boxwork structures conducive to the presence of gold.