... reservoir geomechanics Rock mechanics mining drive Reservoir Characterization Upstream Oil & Gas mechanism compression test stress concentration rockburst metals & mining quartzite international journal investigation Orebody specimen excavation pillar footwall quartzite tangent...

... 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 uniaxial dataset from Bingham Canyon is presented for a quartzite. The dataset is exceptionally complete in terms of the number of tests conducted (total of 217 uniaxial and triaxial tests) and the detail in test data quality and characterization of the specimens. The results show that triaxial data...

... 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...

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

.... 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. Upstream Oil & Gas energy density discontinuity Reservoir Characterization displacement strain energy density pm theory stope rock property reservoir geomechanics stability quartzite stress energy density rock mass finite element...

... 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...

... 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...

.... 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...

... 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...

... 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...

..." 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...

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

... 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. hydraulic fracturing information boundary potential fracture zone Rock Structure breakage paper model fracture propagation reservoir geomechanics...

...) and Slobodov 3). Reservoir Characterization quartzite minor principal stress strain reading compressire load Upstream Oil & Gas test cube borehole gauge groove absolute rock stress measurement reservoir geomechanics diameter elasticity strain cell principal stress strain gauge cube...