Rock property measurements on large-volume core samples from Yucca Mountain USW GU-3/G-3 and USW G-4 boreholes, Nevada Test Site, Nevada

Stratigraphic correlation and petrography of the bedded tuffs, Yucca Mountain, Nye County, Nevada

“…Bulk density is controlled more by this factor than by mineral composition (Anderson, 1984). The voids through which solutions travel may be composed of prirnar^ porosity factors such as vesicle space and intergranular porosity, or of secondary porosity factors such as dissolution voids and microfracturing (figs.…”

“…Physical-property data on bulk density, grain density, and porosity of the bedded tuffs are scattered among several publications (Anderson, 1984;Lappin, 1982;Price, 1983). Porosity data also exist for bedded tuffs that have not been logged in detail; therefore, it is not known whether the sample tested was from a pumice fall, a surge unit, or a clay-rich weathered zone.…”

Volume II: near-field and altered-zone environment report

“…The composition of cristobalite was assumed to be 1009'oSi02 with a density of 2.30 (Deer et al, 1963), yielding a calculated value of 0.03828 mole Si/cm3. A grain density value for Topopah Spring Tuff lower vitrophyre from a depth of 369.9 m in drill hole GU-3 (Anderson, 1984) was used for the calculations.…”

Preliminary three-dimensional discrete fracture model, Tiva Canyon Tuff, Yucca Mountain area, Nye County, Nevada

“…As a result, the range and distribution of effective apertures is speculative. Another technique is to calculate aperture from sonic velocity measurements (Schlumberger, 1972) to derive fracture porosity and aperture from cores (Anderson, 1984;1991). Using this method, aperture calculations ranged from 100 to 2,200 ^i, with a mean of 500 \i.…”