collapse breccia

collapse breccia

[kə′laps ‚brech·ə]
(geology)
Angular rock fragments derived from the collapse of rock overlying a hollow space.
References in periodicals archive ?
The 2013 core drilling suggests that the tabular zones of mineralized, favourable host rock are cut by one or more high-angle structures causing collapse breccia zones where the mineralization becomes thicker and higher-grade.
13-11 and 13-08 confirm continuity of high-grade gold in the extensive, lower, flat-tabular, collapse breccia body; which is analogous host material for many large Carlin-style deposits.
This breccia is presumed to be similar to photos of some core samples from the earlier holes shown on our web site under "Photo Gallery & Maps/ Drill Core from Collapse Breccia Pipes.
This lower breccia, which is comprised dominantly of collapse breccia, is the preferred depositional environment for gold and the intercept in 13-08 is essentially open in all directions.
Photos of some core samples from these holes are shown on our web site under "Photo Gallery & Maps/ Drill Core from Collapse Breccia Pipes.
Significant intervals of bleaching, alteration, disseminated and vein iron pyrite and a five foot interval of collapse breccia, with fine disseminated iron pyrite in the matrix, were encountered.
This drill is designed so that a true vertical hole can be drilled through the cobbles and boulders of the three targeted uranium bearing collapse breccia pipes without significant deviation.
The Elle and Hermina Pipes have been defined by interpretation of circular features and down warped beds related to collapse breccia pipes and have interpreted sulfide minerals associated with them, indicated by electrical geophysical surveys starting at a depth of about 250 meters (825 feet).
A large "Rain-type" collapse breccia occurs 1,000 feet south of the Pinion near surface oxide gold resource currently under evaluation for possible production.
Arizona/Utah Uranium projects: Complete evaluation and acquisition of collapse breccia pipes in Northern Arizona (see news release June 23/05) and additional uranium prospects in Utah and Wyoming.
The targets to be drilled are collapse breccia zones that are geologically similar to those found in the Tres Marias mine and if mineralized could provide additional tonnage for the project.
OTCBB:RYSMF) and (TSX VENTURE:RSM)--The next drill program will test the potential to increase the size of the deposit in an area south of the known deposit, an area between the Main Zone and the Pinon south gold mineralized collapse breccia structure that occurs on a northwest trending fault approximately 1,000 feet south of the Pinon Main Zone deposit.