TAVARES, J. F.; http://lattes.cnpq.br/1338427799096040; TAVARES, José Ferreira.
Abstract:
With the development of cutting methods, from the 1990s onwards, the
last century, and new rigging technologies are better
modern looms, rocks previously considered unviable
for use in construction - abundant bustling pegmatites, migmatites and gneisses
precambrian formations existing mainly in the
Paraíba and Rio Grande do Norte, became part of the map of the
producers of exotic ornamental "granites". Such rocks, notorious for their beauty and
previously considered technologically and economically unviable, have become
most sought after by the rich European and North American markets, leading
unceasing pursuit of these rocks with patterns that escape the
biotite shales with a high degree of metamorphism,
pegmatites, especially homogeneous, chalky silicate such as tactites,
fault zones, breaches and metaconglomeres among many others
precambrian rocks, provided that they allow, in the mining fronts, the extraction of
standard size blocks. Pre-existing works in the bibliography
research lead to a conclusion that attests to the modernity of this new line
of production. All mining engineering studies published on
ornamental rocks, turn to those already traditionally known in the
most often emphasizing more specified rock mining methods
traditional granitics, this work is different because it is the result of
direct practical monitoring at all stages of a productive process in
selected "exotic" rocks, proposing to comment on the various
most commonly used cutting types, with their proper applications and comments
technical-economic.