..., this process is not necessarily a straightforward one. rock type geological subdiscipline sandstone specimen sensor quartzite geologist reservoir geomechanics dataset norite geology reservoir characterization argillite quartzite threshold ae sensor meyer sandstone specimen argillite...

... for rockmasses. geologist reservoir geomechanics rockmass rock type geological subdiscipline geology reservoir characterization martin excavation rock-type specific hoek-brown criteria granodiorite uniaxial compressive strength quartzite initiation criterion tunnel kaiser mineral...

.... Historically, Cooke 4 exploited the Ventersdorp Contact Reef (VCR) of the Venterspost Formation. The rock mass surrounding the stopes, tunnels and shaft consists of quartzites, pebbly quartzites, argillaceous quartzites, the VCR conglomerate, and medium-strong and weak volcanic rocks of the Klipriviersberg...

... quartzite international journal reservoir geomechanics mining drive investigation Reservoir Characterization Upstream Oil & Gas mechanism tangent modulus specimen excavation pillar stress analysis rock mass stress level structural geology Orebody Rock mechanics footwall quartzite...

... of pillar failures in areas within the Middle Quartzite of the Revett formation led to the observed surface subsidence. The Troy Mine experience was used to understand the level of stresses and failure mechanism leading to the collapse of some pillars in the North Orebody in order to estimate pillar...

... in geomorphology. 10Be-derived bare rock erosion rates were measured for 20 outcrops in the Blue Ridge Mountains of Virginia comprised of either 1) quartzite, 2) fine metasandstone, 3) coarse grained metasandstone, or 4) granite. Subcritical cracking parameters (e.g. fracture toughness, subcritical cracking index...

... and outlines a procedure for processing triaxial data depending on the confining stress level for the determination of the Hoek-Brown strength envelop parameter mi and confidence intervals. For this, a triaxial and uniaxial dataset from Bingham Canyon is presented for a quartzite. The dataset is exceptionally...

... is now generating 450 MW power. The powerhouse complex of Stage II is proposed to be located 180 m downstream of the Stage I powerhouse and is located inside a hillock rising to a maximum EL 1150 m to generate 450 MW of hydro power. The rock formations present in the hillock consist of hard quartzite...

... Upstream Oil & Gas stope hard rock closure response quartzite steady-state closure rate stope face closure rate step closure hangingwall closure measurement lava hangingwall excavation closure closure profile instantaneous closure time-dependent behaviour hard lava reef lava closure...

.... We have recently conducted a series of hydraulic fracturing stress measurements in the Sioux Quartzite Ridge, near Sioux Falls, S. Dakota (Figure 2). The results of these tests were surprising in view of the perceived state of stress in the Midcontinent. The objective of this paper is to describe...

... on average values of laboratory rock properties. Reservoir Characterization reservoir geomechanics Upstream Oil & Gas stope displacement quartzite energy density rock property strain energy density stress energy density discontinuity stability pm theory safety factor conventional...

... ABSTRACT ABSTRACT The amount of brecciation of faults in mines is greater in felsic igneous rocks and shale than in quartzite, allowing for differences in localities and fault movement by normalizing breccia thickness by a direct log-log relation with fault displacements. Chlorite-cumming...

... ABSTRACT ABSTRACT Terra Tek Engineering instrumented and monitored a concrete shaft lining and the surrounding quartzite at levels 2412 ft, 4063 ft, and 5191 ft during sinking of the Silver Shaft at Hecla Mining Company's Lucky Friday Mine in Wallace, Idaho. Rock displacements were...

.... This is illustrated by reviewing the available data for thermal conductivity of basalt, granite, quartzite and quartz sandstone. Factors that influence the thermophysical properties of rocks are discussed. An attempt is made to analyze the available data and give recommended values for thermal conductivity of Dresser...

... ABSTRACT: We conducted hydrofracturing stress measurements in two adjacent holes drilled from the surface into the Precambrian Waterloo quartzite, some 3 km NE of Waterloo, Wisconsin. In one hole we carried out three tests at 17 m, 163 m and 238 m depth; in the other we ran ten tests between 2...

..." which range up to 20,000 psi. However, the "Brazilian theory" sand-grain tensile strengths are greater than the tensile strengths measured for pure quartz crystals, and tensile strengths computed for quartzite using the Griffith theory. Thus, the Hertzian theory gives results for the tensile strengths...

... type in the district consists almost entirely of argillite and quartzite of the Precambrian Belt series. A few intrusive dikes of predominantly mafic composition are present in some mines and there is one area of Cretaceous quartz monzonite intrusion near the center of the district. The interbeded...

... mineralization centrally located in the stock and adjoining quartzites. In addition, several garnetized limestone beds abutting the stock were also well mineralized. These skarns will be Carr Fork's initial mining target. Of the several limestone beds, only two, the Yampa and the Highland Boy have significant...

...'. Reservoir Characterization reservoir geomechanics Upstream Oil & Gas maxima strength friction displacement quartzite testing machine wedge rock property experiment diameter plane specimen coefficient dolerite stiff testing machine rock specimen fracture stiffness noritc stress...

... The triaxial fracture data for a typical Witwatersrand quartzite, listed in Table I, is plotted in the form of a conventional Mohr diagram in Fig. 1. Reservoir Characterization reservoir geomechanics hydraulic fracturing Rock Structure quartzite criterion information breakage principal stress...