Resumo

NGUEMA-MOZOHO, Alfonso A.; CARTAYA-PIRES, Maday; SARGENTON-ROMERO, Gilberto  e  WATSON-QUESADA, Roberto. Using the jackhammer as rock digging method in Gabricar quarry, North Bioko, Equatorial Guinea. Min. Geol. [online]. 2021, vol.37, n.4, pp. 414-425.  Epub 31-Dez-2021. ISSN 1993-8012.

Blasting and drilling methods are mainly used in basalt rock quarries as blasting-digging methods. The purpose of this study is to argue the validity of using a jackhammer as a rock removal method in Gabricar quarry, based on knowing the geomechanical parameters of rocks as well as the technical-economic indicators for exploitation. Gravimetric, saturation, hydrostatic weighing, pycnometric and axial loads methods were used to obtain physical-mechanical properties of the rocks and geological survey, volumetric joint count, and strength coefficient were used to establish crack elements, block size, and rock mass quality, respectively. 4.75% humidity; 2.39 % porosity; 5.73 g/cm3 volumetric mass; density of 26.44 g/cm3 and axial compressive strength of 173.53 Mpa as average values of physical-mechanical properties were obtained. Four families of cracks with spacing of 0.4 m, 0.6 m; 0.3 m and 0.2 m and 18 mm openings; 13 mm; 3 mm and 9 mm, respectively were established. Blocks are small and the rocky massif is of good quality. The technical-economic analysis showed the efficiency of the jackhammer as a blasting-based digging method in Gabricar quarry.

Palavras-chave : mining; rock digging; quarrying, jackhammer; basalt rocks.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )