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1D resistivity inversion technique in the mapping of igneous intrusives; a step to sustainable quarry development

Nwachukwu M. A., Nwosu L. I., Uzoije P. A., Nwoko C. A.

Journal of Sustainable Mining

2017

Vol. 16, iss. 4

127--138

The use of trial pits as a first step in quarry site development causes land degradation and results in more failure than success for potential quarry investors in some parts of the world. In this paper, resistivity, depth and distance values derived from 26 Vertical Electric Soundings (VES) and 2 profiling inversion sections were successfully used to evaluate a quarry site prior to development. The target rock Diabase (Dolerite) was observed and it had a resistivity range of 3.0 x 10⁴ - 7. 8 x 10⁶ Ω-m, and was clearly distinguishable from associated rocks with its bright red color code on the AGI 1D inversion software. This target rock was overlain by quartzite, indurate shale and mudstone as overburden materials. The quartzite, with its off-red colour, has a resistivity range of 2.0 x 10³-2.9 x 10⁵ Ω-m, while the indurate shale, with a yellowish-brown colour, showed resistivity values ranging from 6.1 x 10² - 2.8 x 10⁵ Ω-m. Topsoil was clayey, with a resistivity range from 8 - 8.6 x 10²u Ω-m and depths of 0.3-1.8 m, often weathered and replaced by associated rocks outcrops. The diabase rock, in the three prospective pits mapped, showed thicknesses of between 40 and 76 m across the site. The prospective pits were identified to accommodate an estimated 2,569,450 tonnes of diabase with an average quarry pit depth of 50 m. This figure was justified by physical observations made at a nearby quarry pit and from test holes. Communities were able to prepare a geophysical appraisal of the intrusive body in their domain for economic planning and sustainability of the natural resource.

Konsolidacja gruntu ilastego z domieszkami środków chemicznych

Rzyczniak M., Czekaj L., Stryczek S., Gonet A., Chrząszcz W.

Wiertnictwo, Nafta, Gaz

2002

R. 19/1

171-180

Celem badań, których wyniki opisano w niniejszej publikacji, było określenie wpływu wybranych alkaliów na zmianę struktury gruntu ilastego. W artykule przeanalizowano wpływ domieszek wybranych alkaliów na degradację wewnętrznej struktury wyselekcjonowanego gruntu ilastego. W tym celu przeprowadzono edometryczne badania konsolidacji prób ilastego gruntu rodzimego oraz mieszanin tego gruntu z 0,5% domieszkami wagowymi wodorotlenku wapnia Ca(OH)2, wodorotlenku potasu KOH oraz wodorotlenku sodu NaOH. Określono intensywność procesu konsolidacji badanych prób oraz wpływ czasu na zmiany podatności na zagęszczanie mieszanin gruntu ilastego z alkaliami.

The lab tests were performed to verify the impact of some alkaline compounds on consolidation of various silty soils and degradation of its internal structure. The oedometer (consolidometer) was used for testing of native soils and the mixtures there of with 0.5 percent of calcium hydroxide, potassium hydroxide and sodium hydroxide. Due consideration was given to the intensity of consolidation process of the alkaline treated soils and the influence of the time factor.