Controles geológicos y distribución geoquímica de las calizas de la cantera Atocongo - Lima

Abstract

Limestone is the main raw material for the production of cement, said rock covers 6.3% (80,985 km2) of the Peruvian territory (INGEMMET), having its largest expansion along the entire mountain range, on the coast there are small outcrops of limestone that occupy hundreds of meters, but framing in the coastal area of the capital, limestone is present in the Pamplona, Atocongo and Chilca Formations, of which only the limestone of the Atocongo and Chilca formation have the Physical-Chemical properties suitable for cement manufacturing. The Atocongo Formation is the main source of raw material of the quarry named by the same name; The Atocongo quarry is the main limestone quarry in Lima, its exploitation dates back to the years of 1916. For the time that has been exploited it has very few geological works and much less those that are directed to the exploration issue. In 1945, studies were carried out on the Atocongo region by Hensaw P. (1945) decades later in 1975, more specialized studies were conducted on the geochemistry of limestone quarry by Breinlinger R. and Burckhardt C. (1975) by the Holderbank company. Later in the years of 1988 and 2004, geological studies of the limestone bodies of the Atocongo quarry were carried out by the SVS Ingenieros company, which were more specialized. Several diamond drilling campaigns were carried out from the 70s until the last one that was developed in 2014. In 2015, the block model previously developed in the Vulcan software was updated by the Core Mining Studies Company (2015) in the Datamine software for the UNACEM quarries. This thesis consists of the review of bibliographic data, review and correction of geochemical data (Blasthole, diamond holes, surface samples and others); field work, surface mapping at a scale of 1: 1000 and finally cabinet work where we will carry out an integration of all the information obtained in previous stages to define the geological controls that define the geometry of the limestone bodies in the quarry, as well as the geochemical distribution of limestone composition, with the aim of determining the geological controls of the quarry and the reason for its variation in the geochemical composition of limestone; all this aimed at the optimization of processes of exploitation and exploration of limestone rock.