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Resumo A Ilha do Catalao e uma das oito ilhas que foram unidas por aterro, a partir de 1951, para compor a Ilha do Fundao, onde esta localizada a Cidade Universitaria da UFRJ – Universidade Federal do Rio de Janeiro. Do antigo arquipelago, a Ilha do Catalao foi a unica que teve mantida sua forma original, sendo ligada ao restante do campus por meio de um tombolo artificial constituido por aterro, certamente produto da demolicao de construcoes historicas, provavelmente do Centro da cidade. Sao reconhecidas na ilha ruinas de edificacoes do seculo XIX e XX, bem como depositos de conchas atribuidos a acampamentos de antigos cacadores-coletores. Em sua porcao norte foi identificada uma antiga lavra de rocha para cantaria e paralelepipedos. O objetivo deste trabalho e descrever a mineracao e tecer consideracoes sobre o metodo de lavra utilizado. Para que isto fosse possivel foi feita intensa pesquisa bibliografica sobre a ilha; realizado o mapeamento geologico na escala 1:1.300; analisados detalhadamente os afloramentos e blocos com marcas de que foram lavrados; medidas as dimensoes e espacamento das marcas de insercao de cunhas e ponteiras para a extracao dos blocos rochosos e utilizado o Programa em R, para tratamento estatistico dos dados, de forma a buscar correlacoes entre as medidas realizadas. Como resultados, sabe-se que, dentre os dois litotipos mapeados na ilha do Catalao, aquele explotado era o metagranitoide equigranular com enclaves deformados de biotita. Essa litologia possui foliacao na direcao regional NE-SW e mergulho medio de 30o para SSE, bem como dois padroes de faturamento: N60E e N26W. A maior atividade de extracao localiza-se as margens da Baia de Guanabara, por onde o material lavrado era transportado por meio de barcacas ou chatas. Alem de blocos brutos e paralelepipedos, foi identificada a ocorrencia de um bloco com borda boleada (arredondada), indicando acabamento final realizado no local. Uma prospeccao no terreno, com o uso de detectores de metais, levou a descoberta de sete ponteiras de ferro fundido para perfuracao da rocha e outros objetos que podem ter ligacao com os servicos necessarios para a lavra. Foram medidos 334 orificios em blocos e afloramentos, sendo que cada orificio possui em media 7-8 cm de profundidade (eixo maior), largura (eixo menor) media de 3-4 cm e media de abertura no topo de 2-3 cm. O metodo de lavra utilizado consistia na perfuracao manual de afloramentos e matacoes da rocha, realizada com ponteiras metalicas. As perfuracoes eram feitas tanto perpendiculares quanto paralelas a foliacao. As medidas nao apresentaram grande dispersao de valores. Com a analise estatistica foi possivel interpretar que a variavel espacamento tem relacao inversa com a profundidade, que, por sua vez, relaciona-se com todos os outros atributos. Finalmente, foi encontrada em uma revista de 1918 fotografia onde observa-se que, ate aquele ano, os afloramentos ao longo da praia ainda nao haviam sido lavrados. No entanto, nunca foram encontradas quaisquer mencoes a mineracao na Ilha do Catalao, sugerindo que esta tenha sido clandestina e ocorrido entre as decadas de 1920 e 1940. A antiga lavra da Ilha do Catalao constitui, portanto, um patrimonio geomineiro extremamente relevante, sendo o unico com estas caracteristicas, grau de preservacao e dimensoes descrito na cidade do Rio de Janeiro. Palavras Chave: antiga lavra, pedra-de-cantaria, Baia de Guanabara Abstract ILHA DO CATALAO QUARRY: A FULL REGISTRATION OF A FORGOTTEN MINING IN GUANABARA BAY (RJ). The Island of Catalao is one of the eight islands that were connected by landfill, from 1951, to compose the Island of Fundao, where is located the University City of UFRJ - Federal University of Rio de Janeiro. From the old archipelago, the Catalao Island was the only one that had kept its original form, being connected to the rest of the campus by means of an artificial tombolo constituted by landfill, certainly product of the demolition of historical constructions, probably of the Center of the city. On the island are recognized ruins of 19th and 20th century buildings, as well as shell deposits attributed to former hunter-gatherer populations. In its northern portion was identified an old quarry for stonework and paving stones. The objective of this work is to describe the mining and to make considerations about the extraction method used. In order to make this possible, an intensive bibliographical research about the island was carried out; the geological mapping was done on the 1:1,300 scale; the outcrops and stone blocks with marks from which they were worked were analyzed in detail; measured the dimensions and spacing of the insertion marks of wedges and punches used to extract the blocks and applied the R program for statistical treatment of the data, in order to seek correlations between the measurements performed. As results, it is known that, among the two lithotypes mapped on the island of Catalao, the one exploited was the equigranular metagranitoid with deformed enclaves of biotite. This lithology has foliation in the NE-SW regional direction and 30o average dip for SSE, as well as two fracturing patterns: N60E e N26W. The largest extraction activity is located on the shores of Guanabara Bay, where the rock blocks were transported by barges or flatboats. In addition to raw blocks and paving stones, it was identified the occurrence of a block with rounded edge, indicating final finishing done in the place. A field survey with the use of metal detectors led to the discovery of seven cast iron punches for rock drilling and other objects that may be connected to the mining services. A total of 334 punch holes were measured in blocks and outcrops, each hole having an 7-8 cm average depth (major axis), 3-4 cm width (minor axis) and 2-3 cm average aperture at the top. The mining method used consisted of manual drilling of rock outcrops and boulders, carried out with iron punches. The perforations were made both perpendicular and parallel to the foliation. The measurements did not show great dispersion of values. With the statistical analysis, it was possible to interpret that the variable spacing has an inverse relationship with depth, which, in turn, is related to all other attributes. Finally, it was found in a 1918 magazine a picture where it is observed that until that year, the outcrops along the beach had not yet been worked. However, no mention was ever made of mining on the Island of Catalao, suggesting that it was clandestine and occurred between the 1920s and 1940s. The old mining of the Island of Catalao is therefore an extremely relevant mining heritage, unique with these characteristics, degree of preservation and dimensions described in the city of Rio de Janeiro. Keywords: old quarry, stonework, Guanabara bay.

PEDREIRA DA ILHA DO CATALÃO: REGISTRO COMPLETO DE UMA MINERAÇÃO ESQUECIDA NA BAÍA DE GUANABARA (RJ)